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NX2147

型号：

NX2147

描述：

具有动态电压调整功能单一通道手机PWM控制器[ SINGLE CHANNEL MOBILE PWM CONTROLLER WITH DYNAMIC VOLTAGE ADJUSTMENT ]

品牌：

MICROSEMI[ Microsemi ]

页数：

11 页

PDF大小：

492 K

下载PDF手册
NX2147  
SINGLE CHANNEL MOBILE PWM CONTROLLER WITH  
DYNAMIC VOLTAGE ADJUSTMENT  
PRODUCTION DATA SHEET  
Pb Free Product  
FEATURES  
DESCRIPTION  
n
n
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Output voltage can be dynamically changed  
Internal Boost Schottky Diode  
The NX2147 controller IC is a step down switching con-  
troller with ability to dynamically adjust the output volt-  
age designed for applications such as Graphic Proces-  
sor Core voltage in Notebook PC products. It allows  
this by adjusting the reference input of the PWM  
comprator as oppose to the traditional method of feed-  
back adjustment. This device has three mode of opera-  
tions; a) Constant ON Time Synchronous Mode, b) Non  
Synchronous PFM mode or c) Ultrasonic PFM mode of  
operation. When selected in Non Synchronous mode,  
the device automatically disables the synchronous  
MOSFET in order to improve efficiency at light load.  
This device provides excellent dynamic response and  
nearly constant frequency for operation from 4.5V to  
24V of input voltage operation. Other features of the  
device are; internal logic level signal MOSFETs for out-  
put dynamic voltage adjustment, internal boost schotcky  
diode, less than 1uA VIN shutdown current, adjustable  
current limiting using lower MOSFET Rds-On and feed-  
back UVLO followed by latchdown, overvoltage protec-  
tion , internal digital soft start and soft stop shutdown  
using and internal 20 ohm MOSFET pull down.  
Ultrasonic mode operation available  
Bus voltage operation from 4.5V to 24V  
Less than 1uA VIN shutdown current with Enable  
low  
Excellent dynamic response with constant on time  
control  
Selectable between Synchronous CCM mode and  
diode emulation mode to improve efficiency at  
light load  
Programmable switching frequency  
Current limit and FB UVLO with latch off  
Over voltage protection with latch off  
Pb-free and RoHS compliant  
n
n
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n
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APPLICATIONS  
Notebook PCs and Desknotes  
Tablet PCs/Slates  
n
n
n
On board DC to DC such as  
12V to 3.3V, 2.5V or 1.8V  
Hand-held portable instruments  
n
TYPICAL APPLICATION  
9
5V  
PVCC  
VCC  
1MEG  
16  
TON  
10  
VIN 7V~22V  
2
1n  
2x10uF  
1u  
1u  
G P I O 0 G P IO1 V O U T ( V )  
1
0
1
0
1
1
0
0
1.17  
1.09  
0.95  
0.9  
12  
13  
HDRV  
BST  
FDS6294  
1uH  
2.2  
ENSW  
/MODE  
15  
1u  
14  
6
Vout (see table above) /12A  
11  
SW  
GPIO0  
GPIO1  
2R5TPE330MC  
330uF  
8
7
FDS6676AS  
LDRV  
PGND  
LOAD  
10  
VREF_OC  
VP  
100k  
3
200k  
4
0.1u  
88.7k  
D1  
1
10n  
VOUT  
634k  
5
D0  
AGND  
6
Figure1 - Typical application of NX2147  
ORDERING INFORMATION  
Device  
Temperature  
Package  
Pb-Free  
Yes  
NX2147CMTR -10o C to 100o C 3X3 MLPQ-16L  
Rev. 1.8  
12/28/09  
NX2147  
ABSOLUTE MAXIMUM RATINGS  
VCC,PVCC to GND & BST to SW voltage ............ -0.3V to 6.5V  
VIN,TON to GND .................................................. -0.3V to 28V  
HDRV to SW Voltage .......................................... -0.3V to 6.5V  
SW to GND ......................................................... -2V to 30V  
All other pins ........................................................ VCC+0.3V  
Storage Temperature Range ..................................-65oC to 150oC  
Operating Junction Temperature Range .................-40oC to 150oC  
ESD Susceptibility ............................................... 2kV  
CAUTION: Stresses above those listed in "ABSOLUTE MAXIMUM RATINGS", may cause permanent  
damage to the device. This is a stress only rating and operation of the device at these or any other conditions  
above those indicated in the operational sections of this specification is not implied.  
PACKAGE INFORMATION  
3x3 16-LEAD PLASTIC MLPQ  
qJA » 46oC/W  
13  
16 15 14  
HDRV  
SW  
1
2
3
4
VOUT  
12  
11  
10  
9
VCC  
VP  
17(PAD)  
AGND  
VREF_OC  
PVCC  
D1  
7
5
8
6
ELECTRICAL SPECIFICATIONS  
Unless otherwise specified, these specifications apply over Vcc =5V, VIN=15V and TA =25oC, unless otherwise  
specified.  
PARAMETER  
SYM  
Test Condition  
Min  
TYP  
MAX Units  
VIN  
V
Recommended voltage range  
Shut down current  
4.5  
24  
uA  
ENSW=GND  
1
VCC,PVCC Supply  
Input voltage range  
Vcc  
4.5  
5.5  
V
Operating quiescent current  
Shut down current  
No switching, ENSW=5V  
ENSW=GND  
1.6  
1
mA  
uA  
Rev. 1.8  
12/28/09  
NX2147  
PARAMETER  
VCC UVLO  
SYM  
Test Condition  
Min  
TYP  
MAX Units  
Under-voltage Lockout  
threshold  
VCC_UVLO  
4.1  
3.9  
V
V
Falling VCC threshold  
ON and OFF time  
TON operating current  
VIN=15V, Rton=1Mohm  
VIN=9V,VP=VOUT=0.75V,Rt  
on=499k  
15  
uA  
ns  
ON -time  
Minimum off time  
390  
590  
380  
800  
ns  
VREF_OC voltage  
VREF_OC voltage  
Line regulation  
2.475  
-2  
2.5  
2.525  
2
V
VCC from 4 to 5.5  
%
OUTPUT voltage  
Output range  
0
5.5  
V
VOUT shut down discharge  
resistance  
ENSW/MODE=GND  
30  
ohm  
ms  
Soft start time  
1.5  
GPIO threshold  
Output high  
V
V
2
0
5
Output low  
0.8  
DO,D1 internal pull down  
MOSFET  
impedance  
13  
5
mohm  
mV  
SW zero cross comparator  
Offset voltage  
High Side Driver  
(CL=3300pF)  
Output Impedance , Sourcing Rsource(Hdrv)  
Current  
I=200mA  
I=200mA  
1.5  
1.5  
ohm  
ohm  
Output Impedance , Sinking  
Current  
Rsink(Hdrv)  
N
Rise Time  
Fall Time  
Deadband Time  
THdrv(Rise)  
THdrv(Fall)  
Tdead(L to Ldrv going Low to Hdrv going  
10% to 90%  
90% to 10%  
50  
50  
30  
ns  
ns  
ns  
H)  
High, 10% to 10%  
Low Side Driver  
(CL=3300pF)  
Output Impedance, Sourcing  
Current  
Output Impedance, Sinking  
Current  
Rsource(Ldrv)  
Rsink(Ldrv)  
I=200mA  
I=200mA  
1.5  
0.5  
ohm  
ohm  
Rise Time  
Fall Time  
Deadband Time  
TLdrv(Rise)  
TLdrv(Fall)  
Tdead(H to SW going Low to Ldrv going  
L) High, 10% to 10%  
10% to 90%  
90% to 10%  
50  
50  
10  
ns  
ns  
ns  
Over temperature  
Threshold  
oC  
oC  
155  
15  
Hysteresis  
Rev. 1.8  
12/28/09  
NX2147  
PARAMETER  
ENSW/MODE threshold and  
bias current  
SYM  
Test Condition  
Min  
TYP  
MAX Units  
80%  
VCC  
60%  
VCC  
VCC+0  
.3V  
80%  
VCC  
60%  
VCC  
PFM/Non Synchronous Mode  
Ultrasonic Mode  
V
V
Leave it open or use limits in  
spec  
Synchronous Mode  
Shutdown mode  
2
0
V
V
0.8  
ENSW/MODE=VCC  
ENSW/MODE=GND  
1
uA  
uA  
Input bias current  
-1  
Under voltage protection  
Under voltage trigger point  
Over voltage protection  
Over voltage tripp point  
Internal Schottky Diode  
Forward voltage drop  
70  
%VP  
%VP  
mV  
125  
500  
forward current=50mA  
Rev. 1.8  
12/28/09  
NX2147  
PIN DESCRIPTIONS  
PIN NUMBER PIN SYMBOL  
PIN DESCRIPTION  
This pin is directly connected to the output of the switching regulator and  
senses the VOUT voltage. An internal MOSFET with 20ohms rdson dis-  
charges the output during turn off.  
VOUT  
1
This pin supplies the internal 5V bias circuit. A 1uF X7R ceramic capacitor is  
placed as close as possible to this pin and ground pin.  
VCC  
VP  
2
3
4
This pin is connected via resistor divider to VREF_OC pin to set the output  
DC voltage from 0.5V to VREF 2.5V.  
This pin is a drain of an internal signal MOSFET. When it is connected via  
resistor to the VP pin,and the GPIO0 pin is set low, it reduces the VP  
voltage by paralleling this resistor to the fixed resistor from VP to GND.  
D1  
This pin is a drain of an internal signal MOSFET. When it is connected via  
resistor to the VP pin,and the GPIO_1 pin is set low, it reduces the VP  
voltage by paralleling this resistor to the fixed resistor from VP to GND.  
D0  
5
6
GPIO1  
A logic level input signal that controls the D1 pin. A low signal turns the  
internal D1 MOSFET on and a High turns it off.  
PGND  
LDRV  
7
8
Power ground.  
Low side gate driver output.  
Provide the voltage supply to the lower MOSFET drivers. Place a high  
frequency decoupling capacitor 1uF X5R to this pin.  
PVCC  
9
Reference output voltage. A resistor divider from this pin to VP pin sets the  
output voltage. The total resistance from this pin to GND also sets the OCP  
threshold voltage. Note that when GPIO0 and GPIO1 pins are high the  
reference divider is at its highest voltage. The nominal voltage of Vref is  
2.5V.  
VREF_OC  
10  
SW  
HDRV  
BST  
11  
12  
13  
14  
15  
This pin is connected to source of high side FETs and provide return path for  
the high side driver. It is also the input of zero current sensing comparator.  
High side gate driver output.  
This pin supplies voltage to high side FET driver. A high freq 1uF X7R  
ceramic capacitor and 2.2ohm resistor in series are recommended to be  
placed as close as possible to and connected to this pin and SW pin.  
GPIO0  
A logic level input signal that controls the D0 pin. A low signal turns the  
internal D0 MOSFET on and a High turns it off.  
ENSW/  
MODE  
Switching converter enable input. Connect to VCC for PFM/Non synchronous  
mode, connected to an external resistor divider equals to 70%VCC for ultra-  
sonic, connected to GND for shutdown mode, floating or connected to 2V for  
the synchronous mode.  
TON  
PAD  
16  
17  
VIN sensing input. A resistor connects from this pin to VIN will set the fre-  
quency. A 1nF capacitor from this pin to GND is recommended to ensure the  
proper operation.  
Analog ground.  
Rev. 1.8  
12/28/09  
NX2147  
BLOCK DIAGRAM  
VCC(2)  
Bias  
4.3/4.1  
Disable_B  
POR  
ODB  
BST(13)  
Thermal  
shutdown  
VIN  
TON(16)  
VIN  
start  
ON time  
pulse  
genearation  
HDRV(12)  
HD  
VOUT  
FET Driver  
HD_IN  
R
Q
S
SW(11)  
1.8V  
5V  
PVCC(9)  
VREF_OC(10)  
LDRV(8)  
Mini offtime  
400ns  
VREF  
OCP_COMP  
start  
R1  
R2  
VP(3)  
PGND(7)  
POR  
HD  
Diode  
emulation  
soft start  
FBUVLO_latch  
VCC  
1M  
ENSW  
/MODE(15)  
Disable  
8k  
PFM_nonultrasonic  
Sync  
MODE  
SELECTION  
1M  
VREF_OC  
R1+R2  
VOUT  
OVP  
OCP_COMP  
1.25*Vref/0.7VREF  
FB  
AGND(PAD)  
DO(5)  
FBUVLO_latch  
0.7*Vref  
VOUT(1)  
VOUT  
SCHIMTTER  
start  
TRIGGER  
GPIO0(14)  
D1(4)  
SCHIMTTER  
TRIGGER  
GPIO1(6)  
Figure 2 - Simplified block diagram of the NX2147  
Rev. 1.8  
12/28/09  
NX2147  
TYPICAL APPLICATION  
(VIN=7V to 22V, VOUT=1.09V/12A)  
R6  
499k  
9
5V  
PVCC  
VCC  
16  
R1  
10  
TON  
C5  
1n  
VIN 7V~22V  
2
CI1  
2x10uF  
C1  
1u  
C2  
1u  
M1  
12  
13  
HDRV  
BST  
FDS6294  
R8  
2.2  
ENSW  
/MODE  
15  
C6  
1u  
Lo  
1uH  
Vout (see table below) /12A  
14  
6
11  
SW  
GPIO0  
GPIO1  
CO1  
2R5TPE330MC  
330uF  
M2  
FDS6676AS  
R7  
10  
C7  
470p  
8
7
LDRV  
PGND  
LOAD  
10  
VREF_OC  
VP  
R2  
100k  
3
C3  
0.1u  
R3  
88.7k  
R4  
200k  
4
C4  
10n  
D1  
1
VOUT  
R5  
634k  
5
D0  
AGND  
6
VOUT TABLE:  
GPIO0 GPIO1 VOUT(V)  
1
0
1
0
1
1
0
0
1.17  
1.09  
0.95  
0.9  
Figure 3 - Demo board schematic  
Rev. 1.8  
12/28/09  
NX2147  
Bill of Materials  
Item  
1
2
3
4
5
6
7
8
Quantity  
Reference  
Value  
10uF/X5R/25V  
2R5TPE330MC  
1uF  
0.1uF  
10nF  
Manufacture  
SANYO  
2
1
2
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
CI1  
CO1  
C1,C2  
C3,C6  
C4  
C5  
C7  
Lo  
M1  
M2  
R1  
R2  
R3  
R4  
R5  
R6  
R7  
1nF  
470p  
RL-8250-1.4-1R0M RENCO  
9
FDS6294  
FDS6676AS  
10  
100k  
88.7k  
200k  
634k  
499k  
10  
2.2  
FAIRCHILD  
FAIRCHILD  
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
R8  
U1  
NX2147  
NEXSEM INC.  
Rev. 1.8  
12/28/09  
NX2147  
Demoboard waveforms  
Fig.5 10A step response( CH1 VOUT AC 50mV/DIV,  
CH4 Output current 5A/DIV)  
Fig.4 Start up( CH1 VOUT 1V/DIV, CH4 Output  
current 5A/DIV)  
Fig.7 D0=0, D1 from low to high(CH1 D0 2V/DIV,  
CH2 VOUT 0.1V/DIV 0.8V OFFSET, CH3 INDUC-  
TOR CURRENT 5A/DIV, CH4 VP 0.1V/DIV 0.8V  
OFFSET)  
Fig.6 Soft turn off(CH1 ENSW 2V/DIV, CH2 VOUT  
0.5V/DIV)  
OUTPUT EFFICIENCY (VIN=12V,VOUT=1.09V)  
95  
90  
85  
80  
75  
70  
65  
60  
55  
50  
10  
100  
1000  
10000  
Fig.8 D1=0, D0 from low to high(CH1 D0 2V/DIV,  
CH2 VOUT 0.1V/DIV 0.8V OFFSET, CH3 INDUC-  
TOR CURRENT 5A/DIV, CH4 VP 0.1V/DIV 0.8V  
OFFSET)  
OUTPUT CURRENT (mA)  
Fig.9 Output efficiency  
Rev. 1.8  
12/28/09  
NX2147  
MLPQ 16 PIN 3 x 3 PACKAGE OUTLINE DIMENSIONS  
SYMBOL  
Dimensions In Millimeters  
Dimensions In Inches  
NAME  
A
A1  
A3  
B
D
D2  
E
MIN  
0.700  
0.000  
MAX  
0.800  
0.050  
MIN  
0.028  
0.000  
MAX  
0.031  
0.002  
0.203REF  
0.008REF  
0.180  
2.950  
1.600  
2.950  
1.600  
0.300  
3.050  
1.750  
3.050  
1.750  
0.007  
0.116  
0.063  
0.116  
0.063  
0.012  
0.120  
0.069  
0.120  
0.069  
E2  
e
L
0.50BSC  
1.5REF  
0.50BSC  
0.325  
0.450  
0.013  
0.018  
M
0.059REF  
Rev. 1.8  
12/28/09  
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