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MYRGP215100B21RA

型号：

MYRGP215100B21RA

品牌：

MURATA[ muRata ]

页数：

20 页

PDF大小：

1810 K

下载PDF手册
“PicoBK™” MYRGP-W／MYRGP-B series  
1.0A Inductor Built-in Step-Down DC/DC Converters  
☆GreenOperationCompatible  
■GENERAL DESCRIPTION  
The MYRGP-W/MYRGP-B series is a synchronous step-down micro DC/DC converter  
which integrates an inductor and a control IC in one tiny package (2.0mm×2.5mm, 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 2.5V to 5.5V enables  
support for applications that require an internally fixed output voltage (0.8V to 3.6V).  
The MYRGP-W/MYRGP-B series use synchronous rectification at an operating frequency  
of 3.0MHz. The MYRGP-W/MYRGP-B series use High Speed Transient Response -COT  
synchronous rectification.  
PWM control (MYRGP-W) or PWM/PFM switching control (MYRGP-B) automatic 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 forcedOFF when input voltagebecomes 2.0V or lower. WhenCE=Low,  
the integrated CLdischarge function which enables the electric chargeat the outputcapacitor CL to be dischargedvia the internal  
discharge switch located between the LX and VSS pins. The power consumption will be less than 1.0μA.  
■FEATURES  
■APPLICATIONS  
Input Voltage  
:2.5V～5.5V  
: 0.8V～3.6V(±2.0%)  
:3.0MHz  
●Note BookPC  
OutputVoltage  
Switching Frequency  
Output Current  
Efficiency  
●TabletPC  
●SSD(Solid State Drive)  
●Mobilephone  
:1.0A  
: 93% (VIN=5.0V, VOUT=3.3V/300mA)  
: High Speed Transient Response -COT  
100% DutyCycle  
●Digital still camera  
●Portable gamemachine  
ControlMethods  
PWM (MYRGP-W)  
PWM/PFM(MYRGP-B)  
: Thermal Shut Down Current  
Limit Circuit(Drop)  
CircuitProtection  
Functions  
Short Circuit Protection(Latch)  
: Soft-start Circuit Built-in  
UVLO  
CLDischarge  
: Low ESR CeramicCapacitor  
Output Capacitor  
Operating Ambient Temperature  
Environmentally Friendly  
: -40℃～+105℃  
: EU RoHS Compliant, Pb Free  
Halogen Free  
■TYPICAL PERFORMANCE  
■TYPICAL APPLICATIONCIRCUIT  
CHARACTERISTICS  
MYRGP-W/MYRGP-B  
(VOUT=3.3V)  
100  
7
MYRGP-B  
80  
1 Lx  
6
VIN  
CIN  
60  
4.7μF  
AGND  
PGND 5  
CE 4  
2
3
CL  
10μF  
1.0A  
40  
VOUT  
MYRGP-W  
8
20  
VIN=5.0V  
0
0.1  
1
10  
100  
1000  
Output Current : IOUT(mA)  
Export Control Code : X0863, Document No : D90DH00050  
MYRGP-W/B series A01 Page 1 of 20  
“PicoBK™” MYRGP-W／MYRGP-B series  
1.0A Inductor Built-in Step-Down DC/DC Converters  
■BLOCK DIAGRAM  
L1  
L2  
Inductor  
Short  
Protection  
V
OUT  
R1  
R2  
CFB  
High Side  
CurrentLim it  
VIN  
Phase  
Compensation  
Error  
Comparator  
Amp.  
AGND  
CE  
S
R
Synch  
Buffer  
Drive  
Q
Logic  
Lx  
Vrefwith  
SoftStart  
CE ControlLogic,  
UVLO  
Thermal Shutdown  
Minimum  
On Time  
Generator  
VIN  
PGND  
VOUT  
PWM/PFM  
Selector  
* The MYRGP-W offers a fixed PWM control, a Control Logic of PWM/PFM Selector is fixed at “PWM” internally.  
The MYRGP-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.  
MYRGP-W/B series A01 Page 2 of 20  
“PicoBK™” MYRGP-W／MYRGP-B series  
1.0A Inductor Built-in Step-Down DC/DC Converters  
PIN CONFIGURATION  
■
* It should be connected the pin No.2 and 5 to the GND pin.  
* If the dissipation pad needs to be connected to other pins, it should be  
connected to the GND pin.  
* Please refer to pattern layout page for the connecting to PCB.  
BOTTOM VIEW  
■
PINASSIGNMENT  
PINNUMBER  
PINNAME  
Lx  
FUNCTIONS  
SwitchingOutput  
AnalogGround  
1
2
3
4
5
6
7
8
AGND  
VOUT  
CE  
Fixed Output Voltage PIN  
ChipEnable  
PGND  
VIN  
PowerGround  
PowerInput  
L1  
InductorElectrodes  
InductorElectrodes  
L2  
■FUNCTION TABLE  
CE PIN Function  
PINNAME  
SIGNAL  
Low  
STATUS  
Stand-by  
Active  
CE  
High  
* Please do not leave the CE pin open.  
■ABSOLUTE MAXIMUM RATINGS  
Ta=25℃  
PARAMETER  
VIN PinVoltage  
SYMBOL  
VIN  
RATINGS  
-0.3 ~ + 6.2  
UNITS  
V
V
LX PinVoltage  
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 PinVoltage  
VCE  
V
1000(*3)  
Power Dissipation  
Operating AmbientTemperature  
StorageTemperature  
Pd  
mW  
℃
℃
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  
(*3) The power dissipation figure shown is PCB mounted (40mm×40mm, t=1.6mm, Glass Epoxy FR-4).  
Please refer to page 11 for details.  
MYRGP-W/B series A01 Page 3 of 20  
“PicoBK™” MYRGP-W／MYRGP-B series  
1.0A Inductor Built-in Step-Down DC/DC Converters  
■
ELECTRICAL CHARACTERISTICS  
Ta=25℃  
●MYRGP-W/MYRGP-B  
PARAMETER  
SYMBOL  
VOUT  
CONDITIONS  
MIN.  
TYP.  
MAX.  
UNITS  
V
CIRCUIT  
When connected to external conponets,  
IOUT =30mA  
Output Voltage  
<E-1>  
<E-2>  
<E-3>  
①
①
VIN  
Operating Voltage Range  
2.5  
-
-
5.5  
V
When connected to external  
components, VIN =<C-1>  
IOUTMAX  
VUVLO  
Maximum Output Current  
UVLO Voltage (*2)  
1000  
1.35  
-
-
mA  
V
①
③
②
Vout=0.6V,  
2
2.48  
40  
Voltage which Lx pin holding ”L” level (*6)  
Quiescent Current  
(MYRGP-B)  
VOUT =VOUT(E) ×1.1V  
Iq  
25  
0
μA  
Quiescent Current  
(MYRGP-W)  
VOUT =VOUT(E) ×1.1V  
Iq  
-
-
400  
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  
-
-
℃
℃
①
①
THYS  
Thermal shutdown Hysteresis  
LxSW ”H” ON Resistance  
30  
RLXH  
RLXL  
VOUT=0.6V, ILX=100mA (*3)  
-
-
0.24  
0.16  
0.37  
0.3  
Ω
Ω
④
④
LxSW ”L” ON Resistance  
(*4)  
VOUT=VOUT(T) × 1.1V, ILX=100mA (*3)  
LxSW ”H” Leakage  
Current  
ILeakH  
VIN=5.5V, VCE=0V, VOUT=0V, VLX=5.5V  
VIN=5.5V, VCE=0V, VOUT=0V, VLX=0V  
-
0
30  
μA  
⑤
LxSW ”L” Leakage  
Current  
ILeakL  
ILIMH  
ΔVOUT  
-
1.3  
-
0
1
2.5  
-
μA  
A
⑤
⑥
①
Current Limit (*5)  
VOUT=0.6V, ILx until Lx pin oscillates  
IOUT=30mA  
1.5  
Output Voltage Temperature  
Characterisics  
/
±100  
ppm/℃  
(VOUT・Δtopr) -40℃≦Topr≦85℃  
VOUT=0.6V, Applied voltage to VCE,  
VCEH  
CE”H” Voltage  
1.4  
-
-
5.5  
0.3  
V
V
③
③
Voltage changes Lx to “H” level (*6)  
VFB=0.6V, Applied voltage to VCE,  
Voltage changes Lx to “L” level (*6)  
VCEL  
CE”L” Voltage  
AGND  
ICEH  
ICEL  
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
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  
210  
0.37  
CL Discharge  
Inductance  
VCE=0V, VOUT=4.0V  
Test Freq.=1MHz  
∆T=+40deg  
50  
-
300  
Ω
μH  
A
⑦
-
L
1
-
-
IDC  
Inductor Rated Current  
-
1.3  
-
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  
(*5) Current limit denotes the level of detection at peak of coil current.  
(*6) "H"=VIN～VIN - 1.2V, "L"=- 0.1V～+ 0.1V  
ｆor the MYRGP-B series  
MYRGP-W/B series A01 Page 4 of 20  
“PicoBK™” MYRGP-W／MYRGP-B series  
1.0A Inductor Built-in Step-Down DC/DC Converters  
■ELECTRICAL CHARACTERISTICS  
●SPEC Table (VOUT, tONmin  
)
tONmin  
tONmin  
NOMINAL  
OUTPUT  
VOLTAGE  
NOMINAL  
OUTPUT  
VOLTAGE  
VOUT  
<E-2>  
VOUT  
fOSC=3.0MHz  
fOSC=3.0MHz  
<E-1>  
<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.  
MAX.  
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  
VIN  
VOUT(T)  
2.25  
VIN  
2.70  
2.250 2.295  
2.300 2.346  
2.350 2.397  
2.400 2.448  
2.450 2.499  
2.500 2.550  
2.550 2.601  
2.600 2.652  
2.650 2.703  
2.700 2.754  
2.750 2.805  
2.800 2.856  
2.850 2.907  
2.900 2.958  
2.950 3.009  
3.000 3.060  
3.050 3.111  
3.100 3.162  
3.150 3.213  
3.200 3.264  
3.250 3.315  
3.300 3.366  
3.350 3.417  
3.400 3.468  
3.450 3.519  
3.500 3.570  
3.550 3.621  
3.600 3.672  
3.75  
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  
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  
72  
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  
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  
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  
■TYPICAL CIRCUIT  
7
PARAMETER  
VALUE  
CIN  
10V/4.7μF  
10V/10μF  
1 Lx  
6
VIN  
CIN  
CL  
4.7μF  
CL  
AGND  
VOUT  
PGND 5  
CE 4  
2
3
10  
μF  
1.0A  
8
NOTE:  
The integrated Inductor can be used only for this DC/DC  
converter. Please do not use this inductor for other  
reasons.  
MYRGP-W/B series A01 Page 5 of 20  
“PicoBK™” MYRGP-W／MYRGP-B series  
1.0A Inductor Built-in Step-Down DC/DC Converters  
■TEST CIRCUITS  
< Circuit No.①>  
< Circuit No.②>  
Wave Form Measure Point  
L
L2  
L1  
L2  
L1  
Lx  
VOUT  
Lx  
VOUT  
VIN  
VIN  
AGND  
A
AGND  
A
CL  
V
RL  
1
μF  
CIN  
PGND  
PGND  
CE  
CE  
※
External Components  
1.0 H(Selected goods)  
CIN 4.7 F(Ceramic)  
CL:10 F(Ceramic)  
L：  
μ
：
μ
μ
< Circuit No.③>  
< Circuit No.④>  
Wave Form Measure Point  
L2  
L1  
L2  
L1  
VOUT  
Lx  
VOUT  
Lx  
VIN  
AGND  
VIN  
AGND  
1
μ
F
V
RPulldown  
ILX  
1
μF  
200  
Ω
PGND  
CE  
PGND  
CE  
RLXH=(VIN-VL)/ILX  
RLXL=VLX/ILX  
< Circuit No.⑤>  
< Circuit No.⑥>  
Wave Form Measure Point  
L2  
L1  
L2  
L1  
ILeakH  
A
VOUT  
Lx  
VOUT  
Lx  
ILeakL  
VIN  
AGND  
AGND  
VIN  
ILIMH  
1
μ
F
1μF  
ICEH  
A
V
PGND  
CE  
CE  
PGND  
ICEL  
< Circuit No.⑦>  
L2  
L1  
IVO UT  
A
VOUT  
Lx  
VIN  
AGND  
1
μF  
CE  
PGND  
MYRGP-W/B series A01 Page 6 of 20  
“PicoBK™” MYRGP-W／MYRGP-B series  
1.0A Inductor Built-in Step-Down DC/DC Converters  
■OPERATIONAL EXPLANATION  
The MYRGP-W/MYRGP-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.)  
L1  
L2  
Inductor  
Short  
Protection  
VOUT  
R1  
R2  
CFB  
High Side  
Current Lim it  
VIN  
Phase  
Compensation  
Error  
Amp.  
Comparator  
AGND  
CE  
S
Synch  
Buffer  
Drive  
Q
Logic  
Lx  
R
Vref with  
SoftStart  
CE ControlLogic,  
UVLO  
Thermal Shutdown  
Minimum  
On Time  
Generator  
VIN  
PGND  
VOUT  
PWM/PFM  
Selector  
<BLOCKDIAGRAM>  
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 dependson the input voltageand outputvoltage(ton). Theon time is set as givenby the equations below.  
ton (ns) =VOUT/VIN×333  
<Switchingfrequency>  
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 equationbelow.  
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.  
<Erroramp>  
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.  
MYRGP-W/B series A01 Page 7 of 20  
“PicoBK™” MYRGP-W／MYRGP-B series  
1.0A Inductor Built-in Step-Down DC/DC Converters  
■OPERATIONAL EXPLANATION (Continued)  
<CurrentLimit>  
The current limiter circuit of the MYRGP-W/MYRGP-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-startfunction>  
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 outputvoltage.  
<PWM/PFM selectioncircuit>  
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 improveefficiency.  
The MYRGP-W series is internally fixed to PWM control.  
The MYRGP-B series is internally fixed to PWM/PFM auto switching control.  
<CEfunction>  
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  
.
<ThermalShutdown>  
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 startupoperation.  
<Short-circuit protectionfunction>  
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.  
MYRGP-W/B series A01 Page 8 of 20  
“PicoBK™” MYRGP-W／MYRGP-B series  
1.0A 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  
applicationmalfunction.  
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  
VOUT(T) : Outputvoltage  
t : Dischargetime  
τ:CL×RDCHG  
CL : Capacitance of Output capacitor  
RDCHG : CL auto-dischargeresistance,  
but it depends on supply voltage.  
MYRGP-W/B series A01 Page 9 of 20  
“PicoBK™” MYRGP-W／MYRGP-B series  
1.0A Inductor Built-in Step-Down DC/DC Converters  
■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 outputvoltagedropsbelowtheshortcircuit protection threshold voltageat theendof the softstartinterval, operationwill 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.  
12. When the input voltage is close to the minimum input voltage, the current limit circuit might not be able to work.  
13. When the voltage difference between input voltage and output voltage is low, the load stability feature may deteriorate.  
14. If the capacitance value is not sufficient by degrading CL due to the low temp. condition and DC bias feature, 100% duty  
cycle might come up for the load transient condition. Add capacitance value for CL if necessary.  
15. If the capacitance value is not sufficient by degrading CL due to the low temp. condition and DC bias feature, the duty cycle  
might not be stable. Add capacitance value for CL if necessary.  
16.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.  
MYRGP-W/B series A01 Page 10 of 20  
“PicoBK™” MYRGP-W／MYRGP-B series  
1.0A Inductor Built-in Step-Down DC/DC Converters  
■NOTE ON USE (Continued)  
17. Please use within the power dissipation range below. Please also note that the power dissipation may changed by test  
conditions, the power dissipation figure shown is PCB mounted.  
Pakage Body Temperature vs Operating Temperature  
Pd vs Operating Temperature  
the power loss of mini DC/DC according to the following formula:  
power loss = VOUT×IOUT×((100/EFFI) – 1) (W)  
VOUT : Output Voltage (V)  
IOUT : Output Current (A)  
EFFI : Conversion Efficiency (%)  
Measurement Condition (Reference data)  
Condition: Mount on a board  
Ambient: Natural convection  
Soldering: Lead (Pb) free  
Board: Dimensions 40 x 40 mm (1600 mm2 in one side)  
Copper (Cu) traces occupy 50% of the board area  
In top and back faces  
Package heat-sink is tied to the copper traces  
Material: Glass Epoxy (FR-4)  
Thickness:1.6mm  
Through-hole: 4 x 0.8 Diameter  
Evaluation Board (unit: mm)  
MYRGP-W/B series A01 Page 11 of 20  
“PicoBK™” MYRGP-W／MYRGP-B series  
1.0A Inductor Built-in Step-Down DC/DC Converters  
NOTE ON USE (Continued)  
■
18. Instructions of patternlayouts  
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) be connected as close as possible  
to the VIN pin, PGND 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.  
<Reference patternlayout>  
<BACK SIDE TOPVIEW>  
<TOPVIEW>  
MYRGP-W/B series A01 Page 12 of 20  
“PicoBK™” MYRGP-W／MYRGP-B series  
1.0A Inductor Built-in Step-Down DC/DC Converters  
■TYPICAL PERFORMANCE CHARACTERISTICS  
(1) Output Voltage vs. Output Current  
MYRGP120100W21RA  
MYRGP120100B21RA  
MYRGP180100W21RA  
MYRGP180100B21RA  
MYRGP330100W21RA  
MYRGP330100B21RA  
MYRGP-W/B series A01 Page 13 of 20  
“PicoBK™” MYRGP-W／MYRGP-B series  
1.0A Inductor Built-in Step-Down DC/DC Converters  
■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)  
(2) Efficiency vs. Output Current  
MYRGP120100W21RA, VOUT=1.2V  
MYRGP120100B21RA, VOUT=1.2V  
MYRGP180100B21RA, VOUT=1.8V  
MYRGP330100B21RA, VOUT=3.3V  
MYRGP180100W21RA, VOUT=1.8V  
MYRGP330100W21RA, VOUT=3.3V  
MYRGP-W/B series A01 Page 14 of 20  
“PicoBK™” MYRGP-W／MYRGP-B series  
1.0A Inductor Built-in Step-Down DC/DC Converters  
■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)  
(3) Ripple Voltage vs. Output Current  
MYRGP120100B21RA, VOUT=1.2V  
MYRGP120100W21RA, VOUT=1.2V  
MYRGP180100W21RA, VOUT=1.8V  
MYRGP180100B21RA, VOUT=1.8V  
MYRGP180100B21RA, VOUT=3.3V  
MYRGP180100W21RA, VOUT=3.3V  
MYRGP-W/B series A01 Page 15 of 20  
“PicoBK™” MYRGP-W／MYRGP-B series  
1.0A Inductor Built-in Step-Down DC/DC Converters  
■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)  
(4) Output Voltage vs. AmbientTemperature  
MYRGP120100W21RA, VOUT=1.2V  
MYRGP180100B21RA, VOUT=1.8V  
MYRGP330100W21RA, VOUT=3.3V  
(5) Quiescent Current vs. AmbientTemperature  
MYRGP-B Series  
(6) CE Voltage vs. AmbientTemperature  
MYRGP-W/MYRGP-B Seires  
MYRGP-W/B series A01 Page 16 of 20  
“PicoBK™” MYRGP-W／MYRGP-B series  
1.0A Inductor Built-in Step-Down DC/DC Converters  
■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)  
(7) Load Transient Response  
(1)MYRGP180100B21RA, VIN=4.2V, VOUT=1.8V / IOUT=0.1mA  
⇔500mA  
VOUT = 1.8V  
IOUT = 0.1mA  
⇔ 500mA  
(2)MYRGP180100B21RA, VIN=4.2V, VOUT=1.8V / IOUT=100mA  
⇔500mA  
VOUT = 1.8V  
IOUT = 100mA  
⇔ 500mA  
MYRGP-W/B series A01 Page 17 of 20  
“PicoBK™” MYRGP-W／MYRGP-B series  
1.0A Inductor Built-in Step-Down DC/DC Converters  
PACKAGING INFORMATION  
■
●
Packaging (2.0mm×2.5mm, h=1.0mm  
)
2.5±0.1  
(0.32 MAX)  
(0.32 MAX)  
1PIN INDENT  
0.3±0.05  
1
2
3
7
■
External Lead  
8
Au  
Sn  
5
4
6
(0.22)  
(0.55)  
(0.22)  
(0.5)  
1.5±0.05  
(0.5)  
●Reference Pattern Layout (unit:mm)  
●Reference Metal Mask Design (unit:mm)  
* I plementatio
y 0.05m .  
m  
m
n
MYRGP-W/B series A01 Page 18 of 20  
“PicoBK™” MYRGP-W／MYRGP-B series  
1.0A Inductor Built-in Step-Down DC/DC Converters  
■
MARKING RULE  
①
represents products series  
MARK  
PRODUCTSERIES  
2
3
MYRGP******W21RA  
MYRGP******B21RA  
1
2
3
6
5
4
②
represents integer and oscillation frequency of the output voltage  
SWITCHING  
OUTPUT  
VOLTAGE(V)  
MARK  
FREQUENCY  
(MHz)  
PRODUCT SERIES  
N
P
R
S
0.x  
1.x  
2.x  
3.x  
MYRGP0**100*21RA  
MYRGP1**100*21RA  
MYRGP2**100*21RA  
MYRGP3**100*21RA  
3
③
represents the decimal part of output voltage  
OUTPUT  
MARK  
PRODUCT SERIES  
VOLTAGE(V)  
X.0  
X.05  
X.1  
0
A
1
MYRGP*00100*21RA  
MYRGP*05100*21RA  
MYRGP*10100*21RA  
MYRGP*15100*21RA  
MYRGP*20100*21RA  
MYRGP*25100*21RA  
MYRGP*30100*21RA  
MYRGP*35100*21RA  
MYRGP*40100*21RA  
MYRGP*45100*21RA  
MYRGP*50100*21RA  
MYRGP*55100*21RA  
MYRGP*60100*21RA  
MYRGP*65100*21RA  
MYRGP*70100*21RA  
MYRGP*75100*21RA  
MYRGP*80100*21RA  
MYRGP*85100*21RA  
MYRGP*90100*21RA  
MYRGP*95100*21RA  
X.15  
X.2  
B
2
X.25  
X.3  
C
3
X.35  
X.4  
D
4
X.45  
X.5  
E
5
X.55  
X.6  
F
6
X.65  
X.7  
H
7
X.75  
X.8  
K
8
X.85  
X.9  
L
9
X.95  
M
④
,
⑤
represents production lot number  
09 0A 0Z 11 9Z A1 A9 AA  
(G, I, J, O, Q, W excluded)  
Note: No character inversion used.  
01～  
、
～
、
～
、
～
、
～AZ、B1～ZZ in order.  
MYRGP-W/B series A01 Page 19 of 20  
“PicoBK™” MYRGP-W／MYRGP-B series  
1.0A 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.  
MYRGP-W/B series A01 Page 20 of 20  
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