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NX2305CMTR PDF预览

NX2305CMTR

更新时间: 2024-11-02 05:53:43
品牌 Logo 应用领域
美高森美 - MICROSEMI 控制器
页数 文件大小 规格书
19页 579K
描述
SINGLE SUPPLY 12V SYNCHRONOUS PWM CONTROLLER WITH NMOS LDO CONTROLLER, POWER GOOD & ENABLES

NX2305CMTR 数据手册

 浏览型号NX2305CMTR的Datasheet PDF文件第2页浏览型号NX2305CMTR的Datasheet PDF文件第3页浏览型号NX2305CMTR的Datasheet PDF文件第4页浏览型号NX2305CMTR的Datasheet PDF文件第5页浏览型号NX2305CMTR的Datasheet PDF文件第6页浏览型号NX2305CMTR的Datasheet PDF文件第7页 
Evaluation board available.  
NX2305  
SINGLE SUPPLY 12V SYNCHRONOUS PWM CONTROLLER  
WITH NMOS LDO CONTROLLER, POWER GOOD & ENABLES  
PRELIMINARY DATA SHEET  
Pb Free Product  
FEATURES  
DESCRIPTION  
n 12V PWM controller plus LDO controller  
The NX2305 controller IC is a combination synchronous  
Buck and LDO controller IC designed to convert single  
12V supply to low cost dual on board supply applica-  
tions. The synchronous controller is used for high cur-  
rent high efficiency step down DC to DC converter appli-  
cations while the LDO controller in conjunction with an  
external low cost N ch MOSFET can be used as a very  
low drop out regulator in applications such as converting  
3.3V to 2.5V output. Internal UVLO keeps both regula-  
tors off until the supply voltage exceeds 9V where inde-  
pendent internal digital soft starts get initiated to ramp  
up both outputs.The switching section has hiccup cur-  
rent limit by sensing the Rdson of synchronous MOSFET.  
The LDO controller has Feedback Under Voltage Lock  
Out as a short circuit protection.Other features includes:  
12V gate drive capability , Adaptive dead band control,  
Power good flag for the switcher controller and separate  
Enable pins for independent power sequencing.  
n Hiccup current limit by sensing Rdson of MOSFET  
12V high side and low side driver  
n Fixed internal 300kHz for switching controller  
n Dual Independent Digital Soft Start Function  
n Adaptive Deadband Control  
n Enable pin available to program the Vbus UVLO  
n Shut Down switching and LDO via pulling down  
EnSW or ENLDO pins  
n
n Pb-free and RoHS compliant  
APPLICATIONS  
n
n
n
PCI Graphic Card on board converters  
Mother board On board DC to DC applications  
On board Single Supply 12V DC to DC such as  
12V to 3.3V, 2.5V or 1.8V  
n
Set Top Box and LCD Display  
TYPICAL APPLICATION  
10  
R14  
C11  
open  
C12  
1uF  
0.1uF  
C1  
VCC  
5V REG  
PVCC  
R6  
10k  
L1 1uH  
1N4148  
VIN2  
VIN1  
+12V  
PGOOD  
+3.3V  
C3  
100uF  
LDO OUT  
C2  
180uF  
C9  
47uF  
M5  
BST  
C4  
0.1uF  
M1  
C10 150pF  
VOUT2  
+1.6V/2A  
IRFR3709Z  
HDRV  
SW  
LDO FB  
ENLDO  
C8  
R8  
5k  
L2 2.2uH  
R9  
5k  
VOUT1  
150uF  
25mohm  
+1.8V/10A  
C7  
2 x 470uF  
R10  
VIN2  
+3.3V  
OCP  
LDRV  
PGND  
R11  
1.4k  
M2  
0.75k  
R1  
4k  
M3  
IRFR3709Z  
R2  
1.1k  
R3  
10k  
HI=SD  
C6  
3.9nF  
R12  
6.8k  
VIN1  
+12V  
FB  
ENSW  
C5  
R5  
10k  
R4  
8k  
R13  
1.4k  
COMP  
M4  
5.6nF  
AGND  
HI=SD  
C13 100pF  
Figure1 - Typical application of NX2305  
ORDERING INFORMATION  
Device  
NX2305CMTR  
NX2305CSTR  
Temperature  
0 to 70oC  
Package  
MLPQ-16L  
SOIC -16L  
Frequency  
300kHz  
300kHz  
Pb-Free  
Yes  
Yes  
0 to 70oC  
Rev.5.0  
08/19/08  
1

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