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NX2147

更新时间: 2024-11-20 10:30:03
品牌 Logo 应用领域
美高森美 - MICROSEMI 控制器手机
页数 文件大小 规格书
11页 492K
描述
SINGLE CHANNEL MOBILE PWM CONTROLLER WITH DYNAMIC VOLTAGE ADJUSTMENT

NX2147 数据手册

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NX2147  
SINGLE CHANNEL MOBILE PWM CONTROLLER WITH  
DYNAMIC VOLTAGE ADJUSTMENT  
PRODUCTION DATA SHEET  
Pb Free Product  
FEATURES  
DESCRIPTION  
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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  
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APPLICATIONS  
Notebook PCs and Desknotes  
Tablet PCs/Slates  
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On board DC to DC such as  
12V to 3.3V, 2.5V or 1.8V  
Hand-held portable instruments  
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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  

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