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MYRGM250150W31RA

型号：

MYRGM250150W31RA

品牌：

MURATA[ muRata ]

页数：

17 页

PDF大小：

1049 K

下载PDF手册
“PicoBK™” MYRGM-W／MYRGM-B series  
1.5A Inductor Built-in Step-Down DC/DC Converters  
☆GreenOperationCompatible  
■GENERAL DESCRIPTION  
The MYRGM-W/MYRGM-B series is a synchronous step-down mini DC/DC converter  
which integrates an inductor and a control IC in one tiny package (2.5mm×3.2mm, h=1.0mm).  
An internal coil simplifies the circuit and enables minimization of noise and other operational  
trouble due to the circuit wiring. A wide operating voltage range of 2.7V to 5.5V enables  
Support for applications that require an internally fixed output voltage (0.8V to 3.6V).  
The MYRGM-W/MYRGM-B series use synchronous rectification at an operating frequency  
of 3.0MHz. The MYRGM-W/MYRGM-B series use High Speed Transient Response-COT.  
PWM control (MYRGM-W) or automatic PWM/PFM switching control (MYRGM-B) can be selected.  
The series have a high speed soft-start as fast as 0.3ms in typical for quick turn-on. With the built-in UVLO (Under Voltage Lock  
Out) function, the internal P-channel driver transistor is forced OFF when input voltage becomes 2.0V or lower. When  
CE=Low, the integrated CL discharge function which enables the electric charge at the output capacitor CL to be discharged via  
the internal discharge switch located between the LX and VSS pins. The power consumption will be less than 1.0µA.  
■FEATURES  
Input Voltage  
■APPLICATIONS  
: 2.7V～5.5V  
●Note Book PC  
●TabletPC  
●SSD  
OutputVoltage  
Oscillation Frequency  
Output Current  
Efficiency  
: 0.8V～3.6V  
:3.0MHz  
:1.5A  
●Mobile phone  
●Projector  
●Printer  
: 92% (VIN=5.0V, VOUT=3.3V/500mA)  
High Speed Transient Response-COT  
100% Duty Cycle  
PWM (MYRGM-W)  
:
Control Methods  
PWM/PFM(MYRGM-B)  
: Thermal Shut Down Current  
Limit Circuit (Drop)  
Circuit Protection  
Functions  
Short Circuit Protection (Latch)  
: Soft-start Circuit Built-in  
UVLO  
CLDischarge  
Output Capacitor  
: Low ESR Ceramic Capacitor  
Operating Ambient Temperature  
Environmentally Friendly  
: -40℃～+105℃  
: EU RoHS Compliant, Pb Free  
Halogen Free  
■TYPICALPERFORMANCE  
CHARACTERISTICS  
■TYPICAL APPLICATIONCIRCUIT  
MYRGM-W/MYRGM-B  
(VOUT=3.3V)  
100  
MYRGM-B  
80  
60  
40  
MYRGM-W  
20  
VIN=5.0V  
1000 10000  
0
0.1  
1
10  
100  
Output Current : IOUT (mA)  
MYRGM-W/B series A01 Page 1 of 17  
“PicoBK™” MYRGM-W／MYRGM-B series  
1.5A Inductor Built-in Step-Down DC/DC Converters  
■BLOCK DIAGRAM  
* The MYRGM-W offers a fixed PWM control, a Control Logic of PWM/PFM Selector is fixed at “PWM” internally.  
The MYRGM-B control scheme is a fixed PWM/PFM automatic switching, a Control Logic of PWM/PFM Selector is fixed at “PWM/PFM automatic  
switching” internally.  
Diodes inside the circuit are an ESD protection diode and a parasitic diode.  
MYRGM-W/B series A01 Page 2 of 17  
“PicoBK™” MYRGM-W／MYRGM-B series  
1.5A Inductor Built-in Step-Down DC/DC Converters  
■PIN CONFIGURATION  
CE 6  
AGND 5  
VOUT 4  
1 VIN  
2 NC  
3 Lx  
7
PGND  
9
L2  
8
L1  
BOTTOM VIEW  
■PINASSIGNMENT  
PINNUMBER  
PINNAME  
VIN  
FUNCTIONS  
Power Input  
1
2
3
4
5
6
7
8
9
NC  
No Connection  
Switching Output  
Lx  
VOUT  
AGND  
CE  
Fixed Output Voltage PIN  
Analog Ground  
Chip Enable  
PGND  
L1  
Power Ground  
Inductor Electrodes  
Inductor Electrodes  
L2  
* This 2-pin NC terminal is not connected to an IC chip.  
■FUNCTION TABLE  
CE PIN Function  
PINNAME  
SIGNAL  
Low  
STATUS  
Stand-by  
Active  
1
2
High  
* Please do not leave the CE pin open.  
■ABSOLUTE MAXIMUM RATINGS  
Ta=25℃  
UNITS  
PARAMETER  
VIN Pin Voltage  
LX Pin Voltage  
SYMBOL  
VIN  
RATINGS  
-0.3 ~ + 6.2  
V
V
VLx  
- 0.3 ~ VIN + 0.3 or + 6.2 (*1)  
- 0.3 ~ VIN + 0.3 or + 4.0(*2)  
- 0.3 ~ +6.2  
VOUT Pin Voltage  
Vout  
V
CE Pin Voltage  
VCE  
V
Power Dissipation  
Pd  
1200  
mW  
℃
℃
Operating Ambient Temperature  
Storage Temperature  
Topr  
Tstg  
- 40 ~ +105  
- 55 ~ +125  
All voltages are described based on the GND (AGND and PGND) pin.  
(*1) The maximum value should be either VIN+0.3 or +6.2 in the lowest voltage  
(*2) The maximum value should be either VIN+0.3 or +4.0 in the lowest voltage  
MYRGM-W/B series A01 Page 3 of 17  
“PicoBK™” MYRGM-W／MYRGM-B series  
1.5A Inductor Built-in Step-Down DC/DC Converters  
■ELECTRICALCHARACTERISTICS  
●MYRGMxxxxxxW31RA/MYRGMxxxxxxB31RA  
Ta=25℃  
PARAMETER  
Output Voltage  
SYMBOL  
VOUT  
CONDITIONS  
MIN.  
TYP.  
MAX.  
UNITS  
V
CIRCUIT  
When connected to external conponets,  
IOUT =30mA  
<E-1>  
<E-2>  
<E-3>  
①
VIN  
Operating Voltage Range  
2.7  
-
5.5  
V
①
When connected to external components,  
VIN =<C-1>  
IOUTMAX  
VUVLO  
Maximum Output Current  
UVLO Voltage (*2)  
1500  
1.35  
-
-
2
-
mA  
V
①
③
②
Vout=0.6V,  
Voltage which Lx pin holding ”L” level (*6)  
2.68  
40  
Quiescent Current  
(MYRGM-B)  
VOUT =VOUT(E) ×1.1V  
Iq  
25  
µA  
Quiescent Current  
(MYRGM-W)  
VOUT =VOUT(E) ×1.1V  
Iq  
-
-
400  
0
825  
1
µA  
µA  
ns  
②
②
①
ISTB  
Stand-by Current  
VCE =0V  
When connected to external components,  
VIN =VCE=<C-1>, IOUT=1mA  
tONmin  
TTSD  
Minimum ON time (*2)  
<E-5>  
<E-6>  
<E-7>  
Thermal Shutdown  
-
-
150  
30  
-
-
℃
℃
①
①
Thermal shutdown  
Hysteresis  
THYS  
LxSW ”H” ON  
Resistance  
RLXH  
RLXL  
VOUT=0.6V, ILX=100mA (*3)  
-
-
0.14  
0.1  
0.28  
0.2  
Ω
Ω
④
④
LxSW ”L” ON  
Resistance (*4)  
VOUT=VOUT(T) × 1.1V, ILX=100mA (*3)  
ILeakH  
ILeakL  
ILIMH  
LxSW ”H” Leakage Current  
LxSW ”L” Leakage Current  
Current Limit (*5)  
VIN=5.5V, VCE=0V, VOUT=0V, VLX=5.5V  
VIN=5.5V, VCE=0V, VOUT=0V, VLX=0V  
VOUT=0.6V, ILx until Lx pin oscillates  
-
-
0
0
3
30  
1
µA  
µA  
A
⑤
⑤
⑥
2.5  
4.5  
OutputVoltage  
Temperature  
Characteristics  
ΔVOUT  
/
IOUT=30mA  
-
±100  
-
ppm/℃  
①
(VOUT・∆topr) -40℃≦Topr≦105℃  
VOUT=0.6V, Applied voltage to VCE,  
Voltage changes Lx to “H” level (*6)  
VCEH  
VCEL  
ICEH  
ICEL  
VIN  
CE”H” Voltage  
CE”L” Voltage  
1.4  
-
-
V
V
③
③
VOUT =0.6V, Applied voltage to VCE,  
Voltage changes Lx to “L” level (*6)  
AGND  
0.3  
CE”H” Current  
CE”L” Current  
VIN=5.5V, VCE=5.5V, VOUT=0V  
VIN=5.5V, VCE=0V, VOUT=0V  
-0.1  
-0.1  
-
-
0.1  
0.1  
µA  
µA  
⑤
⑤
VCE=0V→5.0V, VOUT=VOUT(T)V × 0.9  
After "H" is fed to CE, the time by when  
clocks are generated at Lx pin.  
tSS  
Soft-start Time  
0.1  
0.3  
0.5  
ms  
V
③
③
Short Protection  
Threshold Voltage  
Sweeping VOUT, VOUT voltage which Lx  
becomes “L” level (*6)  
VSHORT  
RDCHG  
0.17  
0.27  
0.37  
CL Discharge  
VCE=0V, VOUT=4.0V  
Test Freq.=1MHz  
ꢀT=+40deg  
50  
-
210  
0.5  
1.8  
300  
Ω
µH  
A
⑦
-
Inductance  
L
-
-
IDC  
Inductor Rated Current  
-
-
Unless otherwise stated, VIN=5.0V, VCE=5.0V, VOUT(T)=Nominal Voltage  
NOTE:  
(*1) When the difference between the input and the output is small, 100% duty might come up and internal control circuits keep P-ch driver turning  
on even though the output current is not so large.  
If current is further pulled from this state, output voltage will decrease because of P-ch driver ON resistance.  
(*2) Including UVLO detect voltage, hysteresis operating voltage range for UVLO release voltage.  
(*3) RLXH=(VIN - Lx pin measurement voltage) / 100mA, RLXL=Lx pin measurement voltage / 100mA  
(*4)  
Design value for the MYRGM-B series  
(*5) Current limit denotes the level of detection at peak of coil current.  
(*6)  
"H"=VIN～VIN - 1.2V, "L"=- 0.1V～+ 0.1V  
MYRGM-W/B series A01 Page 4 of 17  
“PicoBK™” MYRGM-W／MYRGM-B series  
1.5A Inductor Built-in Step-Down DC/DC Converters  
■ELECTRICALCHARACTERISTICS  
●MYRGMxxxxxxW31RA/MYRGMxxxxxxB31RA  
Ta=25℃  
PARAMETER  
Output Voltage  
SYMBOL  
VOUT  
CONDITIONS  
MIN.  
TYP.  
MAX.  
UNITS  
V
CIRCUIT  
When connected to external conponets,  
IOUT =30mA  
<E-1>  
<E-2>  
<E-3>  
①
VIN  
Operating Voltage Range  
2.7  
-
5.5  
V
①
When connected to external components,  
VIN =<C-1>  
IOUTMAX  
VUVLO  
Maximum Output Current  
UVLO Voltage (*2)  
1500  
1.35  
-
-
-
mA  
V
①
③
②
Vout=0.6V,  
Voltage which Lx pin holding ”L” level (*6)  
2
2.68  
40  
Quiescent Current  
(MYRGM-B)  
VOUT =VOUT(E) ×1.1V  
Iq  
25  
µA  
Quiescent Current  
(MYRGM-W)  
VOUT =VOUT(E) ×1.1V  
Iq  
-
-
400  
0
825  
1
µA  
µA  
ns  
②
②
①
ISTB  
Stand-by Current  
VCE =0V  
When connected to external components,  
VIN =VCE=<C-1>, IOUT=1mA  
tONmin  
Minimum ON time (*2)  
<E-5>  
<E-6>  
<E-7>  
TTSD  
Thermal Shutdown  
-
-
150  
30  
-
-
℃
℃
①
①
Thermal shutdown  
Hysteresis  
THYS  
LxSW ”H” ON  
Resistance  
RLXH  
RLXL  
ILeakH  
VOUT=0.6V, ILX=100mA (*3)  
-
-
-
0.14  
0.1  
0
0.28  
0.2  
30  
Ω
Ω
④
④
⑤
LxSW ”L” ON  
Resistance (*4)  
VOUT=VOUT(T) × 1.1V, ILX=100mA (*3)  
VIN=5.5V, VCE=0V, VOUT=0V, VLX=5.5V  
LxSW ”H” Leakage  
Current  
µA  
LxSW ”L” Leakage  
Current  
ILeakL  
ILIMH  
VIN=5.5V, VCE=0V, VOUT=0V, VLX=0V  
VOUT=0.6V, ILx until Lx pin oscillates  
IOUT=30mA  
-
0
3
1
µA  
⑤
⑥
Current Limit (*5)  
2.5  
4.5  
A
Output Voltage  
Temperature  
Characteristics  
ΔVOUT  
/
-
±100  
-
ppm/℃  
①
(VOUT・∆topr) -40℃≦Topr≦105℃  
VOUT=0.6V, Applied voltage to VCE,  
Voltage changes Lx to “H” level (*6)  
VCEH  
VCEL  
ICEH  
ICEL  
VIN  
CE”H” Voltage  
CE”L” Voltage  
1.4  
-
-
V
V
③
③
VOUT=0.6V, Applied voltage to VCE,  
Voltage changes Lx to “L” level (*6)  
AGND  
0.3  
CE”H” Current  
CE”L” Current  
VIN=5.5V, VCE=5.5V, VOUT=0V  
VIN=5.5V, VCE=0V, VOUT=0V  
-0.1  
-0.1  
-
-
0.1  
0.1  
µA  
µA  
⑤
⑤
VCE=0V→5.0V, VOUT=VOUT(T)V × 0.9  
After "H" is fed to CE, the time by  
when clocks are generated at Lx pi.  
tSS  
Soft-start Time  
0.2  
0.4  
0.9  
ms  
V
③
③
Short Protection  
Threshold Voltage  
Sweeping VOUT, VOUT voltage which Lx  
becomes “L” level (*6)  
VSHORT  
RDCHG  
0.17  
0.27  
0.37  
CL Discharge  
VCE=0V, VOUT=4.0V  
Test Freq.=1MHz  
ꢀT=+40deg  
50  
-
210  
0.5  
1.8  
300  
Ω
µH  
A
⑦
-
Inductance  
L
-
-
IDC  
Inductor Rated Current  
-
-
Unless otherwise stated, VIN=5.0V, VCE=5.0V, VOUT(T)=Nominal Voltage  
NOTE:  
(*1) When the difference between the input and the output is small, 100% duty might come up and internal control circuits keep P-ch driver turning  
on even though the output current is not so large.  
If current is further pulled from this state, output voltage will decrease because of P-ch driver ON resistance.  
(*2) Including UVLO detect voltage, hysteresis operating voltage range for UVLO release voltage.  
(*3) RLXH=(VIN - Lx pin measurement voltage) / 100mA, RLXL=Lx pin measurement voltage / 100mA  
(*4) Design value for the MYRGM-B series  
(*5) Current limit denotes the level of detection at peak of coil current.  
(*6) "H"=VIN～VIN - 1.2V, "L"=- 0.1V～+ 0.1V  
MYRGM-W/B series A01 Page 5 of 17  
“PicoBK™” MYRGM-W／MYRGM-B series  
1.5A Inductor Built-in Step-Down DC/DC Converters  
■ELECTRICALCHARACTERISTICS  
●SPEC Table (VOUT, tONmin  
)
tONmin  
tONmin  
NOMINAL  
OUTPUT  
VOLTAGE  
NOMINAL  
OUTPUT  
VOLTAGE  
VOUT  
VOUT  
fOSC=3.0MHz  
fOSC=3.0MHz  
<E-1>  
<E-2>  
<E-3>  
<C-1>  
<E-5>  
<E-6>  
<E-7>  
<E-1> <E-2>  
<E-3>  
<C-1>  
<E-5>  
<E-6>  
<E-7>  
MIN.  
0.784  
0.833  
0.882  
0.931  
0.980  
1.029  
1.078  
1.127  
1.176  
1.225  
1.274  
1.323  
1.372  
1.421  
1.470  
1.519  
1.568  
1.617  
1.666  
1.715  
1.764  
1.813  
1.862  
1.911  
1.960  
2.009  
2.058  
2.107  
2.156  
TYP.  
0.800  
0.850  
0.900  
0.950  
1.000  
1.050  
1.100  
1.150  
1.200  
1.250  
1.300  
1.350  
1.400  
1.450  
1.500  
1.550  
1.600  
1.650  
1.700  
1.750  
1.800  
1.850  
1.900  
1.950  
2.000  
2.050  
2.100  
2.150  
2.200  
MAX.  
0.816  
0.867  
0.918  
0.969  
1.020  
1.071  
1.122  
1.173  
1.224  
1.275  
1.326  
1.377  
1.428  
1.479  
1.530  
1.581  
1.632  
1.683  
1.734  
1.785  
1.836  
1.887  
1.938  
1.989  
2.040  
2.091  
2.142  
2.193  
2.244  
MIN.  
71  
TYP.  
119  
121  
122  
123  
123  
130  
136  
142  
148  
154  
160  
167  
173  
179  
185  
191  
198  
200  
200  
200  
200  
200  
200  
200  
200  
200  
200  
200  
200  
MAX.  
166  
169  
171  
172  
160  
169  
177  
185  
193  
201  
209  
217  
225  
233  
241  
249  
257  
260  
260  
260  
260  
260  
260  
260  
260  
260  
260  
260  
260  
MIN.  
2.205  
2.254  
2.303  
2.352  
2.401  
2.450  
2.499  
2.548  
2.597  
2.646  
2.695  
2.744  
2.793  
2.842  
2.891  
2.940  
2.989  
3.038  
3.087  
3.136  
3.185  
3.234  
3.283  
3.332  
3.381  
3.430  
3.479  
3.528  
TYP.  
2.250  
2.300  
2.350  
2.400  
2.450  
2.500  
2.550  
2.600  
2.650  
2.700  
2.750  
2.800  
2.850  
2.900  
2.950  
3.000  
3.050  
3.100  
3.150  
3.200  
3.250  
3.300  
3.350  
3.400  
3.450  
3.500  
3.550  
3.600  
MAX.  
2.295  
2.346  
2.397  
2.448  
2.499  
2.550  
2.601  
2.652  
2.703  
2.754  
2.805  
2.856  
2.907  
2.958  
3.009  
3.060  
3.111  
3.162  
3.213  
3.264  
3.315  
3.366  
3.417  
3.468  
3.519  
3.570  
3.621  
3.672  
MIN.  
140  
140  
140  
140  
140  
140  
140  
140  
140  
140  
140  
140  
140  
140  
140  
140  
140  
140  
140  
140  
140  
140  
142  
144  
146  
148  
151  
153  
TYP.  
200  
200  
200  
200  
200  
200  
200  
200  
200  
200  
200  
200  
200  
200  
200  
200  
200  
200  
200  
200  
200  
200  
203  
206  
209  
212  
215  
218  
MAX.  
260  
260  
260  
260  
260  
260  
260  
260  
260  
260  
260  
260  
260  
260  
260  
260  
260  
260  
260  
260  
260  
260  
264  
268  
272  
276  
280  
284  
VOUT(T)  
0.80  
0.85  
0.90  
0.95  
1.00  
1.05  
1.10  
1.15  
1.20  
1.25  
1.30  
1.35  
1.40  
1.45  
1.50  
1.55  
1.60  
1.65  
1.70  
1.75  
1.80  
1.85  
1.90  
1.95  
2.00  
2.05  
2.10  
2.15  
2.20  
V
VOUT(T)  
2.25  
2.30  
2.35  
2.40  
2.45  
2.50  
2.55  
2.60  
2.65  
2.70  
2.75  
2.80  
2.85  
2.90  
2.95  
3.00  
3.05  
3.10  
3.15  
3.20  
3.25  
3.30  
3.35  
3.40  
3.45  
3.50  
3.55  
3.60  
V
IN  
IN  
2.70  
2.70  
2.70  
2.70  
2.70  
2.70  
2.70  
2.70  
2.70  
2.70  
2.70  
2.70  
2.70  
2.70  
2.70  
2.70  
2.70  
2.75  
2.83  
2.92  
3.00  
3.08  
3.17  
3.25  
3.33  
3.42  
3.50  
3.58  
3.67  
3.75  
3.83  
3.92  
4.00  
4.08  
4.17  
4.25  
4.33  
4.42  
4.50  
4.58  
4.67  
4.75  
4.83  
4.92  
5.00  
5.08  
5.17  
5.25  
5.33  
5.42  
5.50  
5.50  
5.50  
5.50  
5.50  
5.50  
5.50  
72  
73  
74  
86  
91  
95  
99  
104  
108  
112  
117  
121  
125  
130  
134  
138  
140  
140  
140  
140  
140  
140  
140  
140  
140  
140  
140  
140  
■TYPICALCIRCUIT  
VALUE  
10V/10µF  
CIN CL  
NOTE:  
NOTE:  
*1: Max. Temp. for the cap. is +85℃ .  
*2: Max. Temp. for the cap. is +125℃.  
The integrated Inductor can be used only for this DC/DC  
converter. Please do not use this inductor for other  
reasons.  
When under the condition of the voltage difference between input  
voltage and output voltage is low, please use 125℃ product, which  
has small capacity drop.  
MYRGM-W/B series A01 Page 6 of 17  
“PicoBK™” MYRGM-W／MYRGM-B series  
1.5A Inductor Built-in Step-Down DC/DC Converters  
■TEST CIRCUITS  
< Circuit No.① >  
< Circuit No.② >  
Wave Form MeasurePoint  
L
L2  
L1  
L2  
L1  
Lx  
VOUT  
Lx  
VOUT  
VIN  
A
VIN  
AGND  
AGND  
A
CL  
V
RL  
1μF  
CIN  
PGND  
PGND  
CE  
CE  
※External Components L：  
1.0μH(Selected goods)  
CIN,CL:10μF(Ceramic)  
< Circuit No.③ >  
< Circuit No.④ >  
Wave Form Measure Point  
L2  
L1  
L2  
L1  
VOUT  
Lx  
VOUT  
Lx  
VIN  
AGND  
VIN  
AGND  
V
1μF  
RPulldown  
ILX  
1μF  
200Ω  
PGND  
CE  
PGND  
CE  
RLXH=(VIN-VL)/ILX  
RLXL=VLX/ILX  
< Circuit No.⑤ >  
< Circuit No.⑥ >  
Wave Form MeasurePoint  
L2  
L1  
L2  
L1  
ILeakH  
A
VOUT  
Lx  
VOUT  
Lx  
ILeakL  
1μF  
VIN  
AGND  
AGND  
VIN  
ILIMH  
1μF  
ICEH  
V
A
PGND  
CE  
CE  
PGND  
ICEL  
< Circuit No.⑦ >  
L2  
L1  
A
VOUT  
Lx  
VIN  
AGND  
1μF  
CE  
PGND  
MYRGM-W/B series A01 Page 7 of 17  
“PicoBK™” MYRGM-W／MYRGM-B series  
1.5A Inductor Built-in Step-Down DC/DC Converters  
■OPERATIONALEXPLANATION  
The MYRGM-W/MYRGM-B series consists of a reference voltage source, error amplifier, comparator, phase compensation,  
minimum on time generation circuit, output voltage adjustment resistors, P-channel MOS driver transistor, N-channel MOS  
switching transistor for the synchronous switch, current limiter circuit, UVLO circuit, thermal shutdown circuit, short protection  
circuit, PWM/PFM selection circuit and others. (See the BLOCK DIAGRAM below.)  
<BLOCK DIAGRAM>  
The method is High Speed circuit Architecture for Transient with Constant On Time control, which features on time control  
method and a fast transient response that also achieves low output voltage ripple.  
The on time (ton) is determined by the input voltage and output voltage, and turns on the Pch MOS driver Tr. for a fixed time.  
During the off time (toff), the voltage that is fed back through R1 and R2 is compared to the reference voltage by the error amp,  
and the error amp output is phase compensated and sent to the comparator. The comparator compares this signal to the  
reference voltage, and if the signal is lower than the reference voltage, sets the SR latch. On time then resumes. By doing this,  
PWM operation takes place with the off time controlled to the optimum duty ratio and the output voltage is stabilized. The phase  
compensation circuit optimizes the frequency characteristics of the error amp, and generates a ramp wave similar to the ripple  
voltage that occurs in the output to modulate the output signal of the error amp. This enables a stable feedback system to be  
obtained even when a low ESR capacitor such as a ceramic capacitor is used, and a fast transient response and stabilization of  
the output voltage are achieved.  
<Minimum on time generation circuit>  
Generates an on time that depends on the input voltage and output voltage (ton). The on time is set as given by the equations below.  
ton (ns) =VOUT/VIN×333  
<Switching frequency>  
The switching frequency can be obtained from the on time (ton), which is determined by the input voltage and output voltage,  
as given by the equation below.  
fOSC (MHz) = VOUT(V) / (VIN(V)×ton(ns))  
<100% duty cycle mode>  
When the load current is heavy and the voltage difference between input voltage and output voltage is small, 100% duty cycle  
mode is activated and it keeps the Pch MOS driver Tr. turning on. 100% duty cycle mode attains a high output voltage stability  
and a high-speed response under all load conditions, from light to heavy, even in conditions where the dropout voltage is low.  
<Error amp>  
The error amp monitors the output voltage. The voltage divided by the internal R1 and R2 resistors is a feedback voltage for  
Error Amp. and compared to the reference voltage. The output voltage of the error amp becomes higher when the feedback  
voltage is higher than the reference voltage. The frequency characteristics of the error amp are optimized internally.  
MYRGM-W/B series A01 Page 8 of 17  
“PicoBK™” MYRGM-W／MYRGM-B series  
1.5A Inductor Built-in Step-Down DC/DC Converters  
■OPERATIONAL EXPLANATION (Continued)  
<Current Limit>  
The current limiter circuit of the MYRGM-W/MYRGM-B series monitors the current flowing through the P-channel MOS driver  
transistor connected to the Lx pin. When the driver current is greater than a specific level, the current limit function operates to  
turn off the pulses from the Lx pin at any given timing. When the over current state is eliminated, the IC resumes its normal  
operation.  
<Reference voltage source, soft-start function>  
The reference voltage forms a reference that is used to stabilize the output voltage of the IC. After chip enable of the IC, the  
reference voltage connected to the error amp increases linearly during the soft-start interval.  
This allows the voltage divided by the internal R1 and R2 resistors and the reference voltage to be controlled in a balanced  
manner, and the output voltage rises in proportion to the rise in the reference voltage. This operation prevents rush input current  
and enables the output voltage to rise smoothly.  
If the output voltage does not reach the set output voltage within the soft start time, such as when the load is heavy or a large  
capacity output capacitor is connected, the balancing of the voltage divided by the internal resistors R1 and R2 and the reference  
voltage is lost, however, the current restriction function activates to prevent an excessive increase of input current, enabling a  
smooth rise of the output voltage.  
<PWM/PFM selection circuit>  
PWM control is a continuous conduction mode, and operates at a stable switching frequency by means of an on time (ton) that is  
determined by the input voltage and output voltage regardless of the load.  
PWM/PFM auto switching control is a discontinuous conduction mode at light loads, and lowers the switching frequency to  
reduce switching loss and improve efficiency.  
The MYRGM-W series is internally fixed to PWM control.  
The MYRGM-B series is internally fixed to PWM/PFM auto switching control.  
<CE function>  
Operation starts when “H” voltage is input into the CE pin. The IC can be put in the shutdown state by inputting “L” voltage into  
the CE pin. In the shutdown state, the supply current of the IC is 0µA (TYP.), and the Pch MOS driver Tr. and Nch MOS switch Tr.  
for synchronous rectification turn off. The CE pin is a CMOS input and the sink current is 0µA.  
<UVLO>  
When the VIN voltage becomes 2.00V (TYP.) or lower, the P-ch MOS driver transistor output driver transistor is forced OFF to  
prevent false pulse output caused by unstable operation of the internal circuitry. When the VIN pin voltage becomes 2.10V (TYP.)  
or higher, switching operation takes place. By releasing the UVLO function, the IC performs the soft start function to initiate output  
startup operation. The UVLO circuit does not cause a complete shutdown of the IC, but causes pulse output to be suspended;  
therefore, the internal circuitry remains in operation.  
<Thermal Shutdown>  
For protection against heat damage of the ICs, thermal shutdown function monitors chip temperature. The thermal shutdown  
circuit starts operating and the P-ch MOS driver and N-ch MOS driver transistor will be turned off when the chip’s temperature  
reaches 150℃. When the temperature drops to 120℃ (TYP.) or less after shutting of the current flow, the IC performs the soft-  
start function to initiate output startup operation.  
<Short-circuit protection function>  
The short-circuit protection circuit protects the device that is connected to this product and to the input/output in  
situations such as when the output is accidentally shorted to GND. The short-circuit protection circuit monitors the output voltage,  
and when the output voltage falls below the short-circuit protection threshold voltage, it turns off the Pch MOS driver Tr and  
latches it. Once in the latched state, operation is resumed by turning off the IC from the CE pin and then restarting, or by re-input  
into the VINpin.  
MYRGM-W/B series A01 Page 9 of 17  
“PicoBK™” MYRGM-W／MYRGM-B series  
1.5A Inductor Built-in Step-Down DC/DC Converters  
■OPERATIONAL EXPLANATION (Continued)  
<CL High SpeedDischarge>  
The product can quickly discharge the electric charge at the output capacitor (CL) when a low signal to the CE pin which enables  
a whole IC circuit put into OFF state, is inputted via the N-ch MOS switch transistor located between the VOUT pin and the GND  
pin. When the IC is disabled, electric charge at the output capacitor (CL) is quickly discharged so that it may avoid application  
malfunction.  
Output Voltage Dischage characteristics  
RDCHG=210Ω (TYP.) CL=10µF  
/ τ  
V=VOUT(T) × e - t  
t =τLn (VOUT(T) / V)  
V : Output voltage after discharge  
V
OUT(T) : Outputvoltage  
t : Discharge time  
τ: CL×RDCHG  
CL : Capacitance of Output capacitor  
R
DCHG : CL auto-discharge resistance,  
but it depends on supply voltage.  
■NOTE ON USE  
1. For the phenomenon of temporal and transitional voltage decrease or voltage increase, the IC may be damaged or  
deteriorated if IC is used beyond the absolute MAX. specifications.  
2. Spike noise and ripple voltage arise in a switching regulator as with a DC/DC converter. These are greatly influenced by  
external component selection, such as the coil inductance, capacitance values, and board layout of external components.  
Once the design has been completed, verification with actual components should be done.  
3. The DC/DC converter characteristics depend greatly on the externally connected components as well as on the characteristics  
of this IC, so refer to the specifications and standard circuit examples of each component when carefully considering which  
components to select. Be especially careful of the capacitor characteristics and use B characteristics (JIS standard) or X7R,  
X5R (EIA standard) ceramic capacitors.  
4. Sufficiently reinforce the ground wiring. In particular, reinforce near the PGND and AGND pin as fluctuations of the ground  
phase due to the ground current during switching may cause the operation of the IC to become unstable.  
5. Mount external components as close as possible to the IC. Keep the wiring short and thick to lower the wiring impedance.  
6. A feature of High Speed Transient Response -COT control is that it controls the off time in order to control the duty, which  
power loss between the input (VIN pin) and output (VOUT pin) due to the load, and thus the switching  
addition, changes in the on time due to 100% duty cycle mode are allowed. For this reason, caution  
varies due to the effects of  
frequency fluctuates. In  
must be exercised as the characteristics of the switching frequency will vary depending on the external component  
characteristics, board layout, input voltage, output voltage, load current and other parameters.  
7. Due to propagation delay inside the product, the on time generated by the minimum on time generation circuit may not be the  
same as the on time that is the ratio of the input voltage to the output voltage.  
8. With regard to the current limiting value, the actual coil current may at times exceed the electrical characteristics due to  
propagation delay inside the product.  
9. The CE pin is a CMOS input pin. Do not use with the pin open. If connecting to the input or ground, use a resistor up to 1MΩ.  
To prevent malfunctioning of the device connected to this product or the input/output due to short circuiting between pins, it is  
recommended that a resistor be connected.  
10. If the outputvoltagedropsbelowthe shortcircuit protectionthresholdvoltageat the end of the softstartinterval, operation will stop.  
11. PWM/PFM auto switching control is a discontinuous conduction mode when the load is light, and in cases where the voltage  
difference between input and output is low or the coil inductance is higher than the value indicated in the standard circuit  
example, the coil current may reverse when the load is light, and thus pulse skipping will not be possible and light load  
efficiency will worsen.  
MYRGM-W/B series A01 Page 10 of 17  
“PicoBK™” MYRGM-W／MYRGM-B series  
1.5A Inductor Built-in Step-Down DC/DC Converters  
■NOTE ON USE (Continued)  
12. When the voltage difference between input voltage and output voltage is low, the load stability feature may deteriorate.  
13. MURATA places an importance on improving our products and their reliability.We request that users incorporate fail-safe  
designs and post-aging protection treatment when using MURATA products in their systems.  
14. Instructions of pattern layouts  
The operation may become unstable due to noise and/or phase lag from the output current when the wire impedance is high,  
please place the input capacitor(CIN) and the output capacitor (CL) as close to the IC as possible.  
(1) In order to stabilize VIN voltage level, we recommend that a by-pass capacitor (CIN) is connected as close as possible to the  
VIN pin, PGND pin and AGND pin.  
(2) Please mount each external component as close to the IC as possible.  
(3) Wire external components as close to the IC as possible and use thick, short connecting traces to reduce the circuit  
impedance.  
(4) Make sure that the GND traces are as thick as possible, as variations in ground potential caused by high ground currents at  
the time of switching may result in instability of the IC.  
(5) This series’ internal driver transistors bring on heat because of the output current and ON resistance of P-channel and  
N-channel MOS driver transistors. Please consider the countermeasures against heat if necessary.  
(6) In the following reference pattern layout drawing, the 2-pin NC terminal is open, but it is not connected to the  
IC chip.Therefore, there is no problem with connecting it to a 1-pin (Vin) or 2-pin (Lx).  
<Reference pattern layout>  
CIN2:Optional  
<BottomView>  
<TopView>  
MYRGM-W/B series A01 Page 11 of 17  
“PicoBK™” MYRGM-W／MYRGM-B series  
1.5A Inductor Built-in Step-Down DC/DC Converters  
■TYPICAL PERFORMANCE CHARACTERISTICS  
(1) Output Voltage vs. Output Current  
MYRGM-W/MYRGM-B, VOUT=1.8V  
MYRGM-W/MYRGM-B, VOUT=3.3V  
VIN=5.0V  
2.0  
1.9  
1.8  
1.7  
1.6  
3.5  
3.4  
3.3  
3.2  
3.1  
MYRGM-W  
VIN=3.3V,5.0V  
MYRGM-W  
MYRGM-B  
MYRGM-B  
VIN=3.3V,5.0V  
0.1  
1
10  
100  
1000  
10000  
10000  
10000  
0.1  
0.1  
0.1  
1
10  
100  
1000  
10000  
Output Current : IOUT (mA)  
Output Current : IOUT (mA)  
(2) Efficiency vs. Output Current  
MYRGM-W/MYRGM-B, VOUT=1.8V  
MYRGM-W/MYRGM-B, VOUT=3.3V  
MYRGM-B  
100  
80  
60  
40  
20  
0
100  
80  
60  
40  
20  
0
MYRGM-B  
5.0V  
VIN=3.3V  
MYRGM-W  
MYRGM-W  
VIN=5.0V  
1000 10000  
0.1  
1
10  
100  
1000  
1
10  
100  
Output Current : IOUT (mA)  
Output Current : IOUT (mA)  
(3) Ripple Voltage vs. Output Current  
MYRGM-W/MYRGM-B, VOUT=1.8V  
MYRGM-W/MYRGM-B, VOUT=3.3V  
VIN=5.0V  
100  
80  
60  
40  
20  
0
100  
80  
60  
40  
20  
0
MYRGM-B  
VIN=3.3V,5.0V  
MYRGM-W  
MYRGM-W  
MYRGM-B  
VIN=3.3V,5.0V  
0.1  
1
10  
100  
1000  
1
10  
100  
1000  
10000  
Output Current : IOUT (mA)  
Output Current : IOUT (mA)  
MYRGM-W/B series A01 Page 12 of 17  
“PicoBK™” MYRGM-W／MYRGM-B series  
1.5A Inductor Built-in Step-Down DC/DC Converters  
■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)  
(4) Output Voltage vs. Ambient Temperature  
MYRGM-W/MYRGM-B,VOUT=1.8V  
2.0  
MYRGM-W/MYRGM-B,VOUT=3.3V  
3.5  
3.4  
3.3  
3.2  
3.1  
Vin=5.0V,Iout=1.0A  
Vin=5.0V,Iout=1.0A  
Vin=5.0V,Iout=1.5A  
Vin=4.2V,Iout=1.0A  
Vin=4.2V,Iout=1.5A  
Vin=5.0V,Iout=1.5A  
Vin=3.3V,Iout=1.0A  
Vin=3.3V,Iout=1.5A  
1.9  
1.8  
1.7  
1.6  
-50  
-25  
0
25  
50  
75  
100 125  
-50  
-25  
0
25  
50  
75  
100 125  
Ambient Temperature : Ta (℃)  
Ambient Temperature : Ta (℃)  
(5) Switching Frequency vs. Ambient Temperature  
MYRGM180150W31RA(VOUT=1.8V)  
3.3  
MYRGM330150W31RA(VOUT=3.3V）  
Vin=5.0V  
Vin=3.3V  
3.2  
3.1  
3.0  
2.9  
2.8  
IOUT=300mA  
2.7  
-50  
-25  
0
25  
50  
75  
100 125  
Ambient Temperature: Ta (℃)  
(6) Switching Frequency vs. Input Voltage  
MYRGM180150W31RA(VOUT=1.8V)  
MYRGM330150W31RA(VOUT=3.3V）  
4.0  
3.5  
3.0  
2.5  
2.0  
4.0  
Ta=-40℃  
Ta=25℃  
Ta=-40℃  
Ta=25℃  
Ta=85℃  
Ta=105℃  
Ta=85℃  
Ta=105℃  
3.5  
3.0  
2.5  
2.0  
IOUT=300mA  
IOUT=300mA  
2.5  
3.0  
3.5  
4.0  
4.5  
5.0  
5.5  
2.5  
3.0  
3.5  
4.0  
4.5  
5.0  
5.5  
Input Voltage: VIN (V)  
Input Voltage: VIN (V)  
MYRGM-W/B series A01 Page 13 of 17  
“PicoBK™” MYRGM-W／MYRGM-B series  
1.5A Inductor Built-in Step-Down DC/DC Converters  
■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)  
(7) Load Transient Response  
MYRGM180150B31RA (VIN=5V, IOUT=1mA⇔1000mA)  
MYRGM180150B31RA (VIN=5V, IOUT=100mA⇔1000mA)  
VOUT=1.8V  
1
VOUT=1.8V  
1
I
=1mA⇔1000mA  
IOUT=100mA⇔1000mA  
OUT
2
2
1ch：50mV/div 2ch：500mA/div H:100us/div  
1ch：50mV/div 2ch：500mA/div H：100us/div  
MYRGM330150B31RA (VIN=5V, IOUT=100mA⇔1000mA)  
MYRGM330150B31RA (VIN=5V, IOUT=1mA⇔1000mA)  
VOUT=3.3V  
VOUT=3.3V  
1
1
IOUT=1mA⇔1000mA  
IOUT=100mA⇔1000mA  
2
2
1ch：50mV/div 2ch：500mA/div H:100us/div  
1ch：50mV/div 2ch：500mA/div H:100us/div  
MYRGM-W/B series A01 Page 14 of 17  
“PicoBK™” MYRGM-W／MYRGM-B series  
1.5A Inductor Built-in Step-Down DC/DC Converters  
■PACKAGING INFORMATION  
2.5±0.1  
1PININDENT  
R0.05  
(0.1) 0.75±0.05 (0.8)  
(0.2)  
L1  
L2  
(0.5)  
4
5
6
3
2
1
7
7
0.25±0.05  
(1.0)  
0.2±0.05  
1.6±0.05  
●Reference Pattern Layout (unit:mm)  
●Reference Metal Mask Design (unit: mm)  
MYRGM-W/B series A01 Page 15 of 17  
“PicoBK™” MYRGM-W／MYRGM-B series  
1.5A Inductor Built-in Step-Down DC/DC Converters  
■MARKING RULE  
① represents products series  
7
7
MARK  
PRODUCTSERIES  
MYRGM-W******  
MYRGM-B******  
1
2
3
6
5
4
A
B
② represents integer of the referencevoltage  
L1  
L2  
OUTPUT  
MARK  
VOLTAGE (V)  
PRODUCTSERIES  
0.X  
1.X  
2.X  
3.X  
A
B
C
D
MYRGM0******31RA  
MYRGM1******31RA  
MYRGM2******31RA  
MYRGM3******31RA  
③ represents decimal number of the referencevoltage  
OUTPUT  
VOLTAGE MARK  
(V)  
OUTPUT  
VOLTAGE MARK  
(V)  
PRODUCT  
SERIES  
PRODUCT  
SERIES  
X.0  
X.1  
X.2  
X.3  
X.4  
X.5  
X.6  
X.7  
X.8  
X.9  
0
1
2
3
4
5
6
7
8
9
MYRGM*0*****31RA  
MYRGM*1*****31RA  
MYRGM*2*****31RA  
MYRGM*3*****31RA  
MYRGM*4*****31RA  
MYRGM*5*****31RA  
MYRGM*6*****31RA  
MYRGM*7*****31RA  
MYRGM*8*****31RA  
MYRGM*9*****31RA  
X.05  
X.15  
X.25  
X.35  
X.45  
X.55  
X.65  
X.75  
X.85  
X.95  
05  
15  
25  
35  
45  
55  
65  
75  
85  
95  
MYRGM*05150*31RA  
MYRGM*15150*31RA  
MYRGM*25150*31RA  
MYRGM*35150*31RA  
MYRGM*45150*31RA  
MYRGM*55150*31RA  
MYRGM*65150*31RA  
MYRGM*75150*31RA  
MYRGM*85150*31RA  
MYRGM*95150*31RA  
④⑤ represents production lot number  
01～09, 0A～0Z, 11～9Z,A1～A9,AA～AZ, B1～ZZin order.  
(G, I, J, O, Q, W excluded)  
* No character inversion used.  
MYRGM-W/B series A01 Page 16 of 17  
“PicoBK™” MYRGM-W／MYRGM-B series  
1.5A Inductor Built-in Step-Down DC/DC Converters  
1. The product and product specifications contained herein are subject to change without notice to  
improve performance characteristics. Consult us, or our representatives before use, to confirm that  
the information in this datasheet is up to date.  
2. The information in this datasheet is intended to illustrate the operation and characteristics of our  
products. We neither make warranties or representations with respect to the accuracy or completeness  
of the information contained in this datasheet nor grant any license to any intellectual property rights  
of ours or any third party concerning with the information in this datasheet.  
3. Applicable export control laws and regulations should be complied and the procedures required by  
such laws and regulations should also be followed, when the product or any information contained in  
this datasheet is exported.  
4. The product is neither intended nor warranted for use in equipment of systems which require extremely  
high levels of quality and/or reliability and/or a malfunction or failure which may cause loss of human  
life, bodily injury, serious property damage including but not limited to devices or equipment used in 1)  
nuclear facilities, 2) aerospace industry, 3) medical facilities, 4) automobile industry and other  
transportation industry and 5) safety devices and safety equipment to control combustions and  
explosions. Do not use the product for the above use unless agreed by us in writing in advance.  
5. Although we make continuous efforts to improve the quality and reliability of our products; nevertheless  
Semiconductors are likely to fail with a certain probability. So in order to prevent personal injury and/or  
property damage resulting from such failure, customers are required to incorporate adequate safety  
measures in their designs, such as system fail safes, redundancy and fire prevention features.  
6. Our products are not designed to be Radiation-resistant.  
7. Please use the product listed in this datasheet within the specified ranges.  
8. We assume no responsibility for damage or loss due to abnormal use.  
9. All rights reserved. No part of this datasheet may be copied or reproduced unless agreed by Murata  
Manufacturing Co., Ltd. in writing in advance.  
Murata Manufacturing Co., Ltd.  
MYRGM-W/B series A01 Page 17 of 17  
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