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NX2309 PDF预览

NX2309

更新时间: 2024-11-18 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
16页 445K
描述
SINGLE SUPPLY 12V SYNCHRONOUS PWM CONTROLLER WITH NMOS LDO CONTROLLER

NX2309 数据手册

 浏览型号NX2309的Datasheet PDF文件第2页浏览型号NX2309的Datasheet PDF文件第3页浏览型号NX2309的Datasheet PDF文件第4页浏览型号NX2309的Datasheet PDF文件第5页浏览型号NX2309的Datasheet PDF文件第6页浏览型号NX2309的Datasheet PDF文件第7页 
Evaluation board available.  
NX2309  
SINGLE SUPPLY 12V SYNCHRONOUS PWM CONTROLLER  
WITH NMOS LDO CONTROLLER  
PRELIMINARY DATA SHEET  
Pb Free Product  
FEATURES  
DESCRIPTION  
n 12V PWM controller plus LDO controller  
The NX2309 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 fixed hiccup  
current limit by sensing the Rdson of synchronous  
MOSFET. The LDO controller has Feedback Under  
Voltage Lock Out as a short circuit protection.Other fea-  
tures includes: 12V gate drive capability , Adaptive dead  
band control.  
n Fixed hiccup current limit by sensing Rdson of  
MOSFET  
n
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 Shut Down switching via pulling down COMP pin  
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  
C12  
1uF  
M3  
VOUT1  
+1.8V  
IRFR3706  
VCC  
D1 MBR0530T1  
L1 1uH  
LDO OUT  
LDO FB  
C9  
47uF  
VIN1  
+12V  
C10150pF  
C3  
47uF  
C2  
VOUT2  
+1.2V/2A  
BST  
180uF  
C4  
0.1uF  
C8  
R8  
5k  
R9  
10k  
M1  
150uF  
25mohm  
IRFR3709Z  
HDRV  
SW  
L2 1.5uH  
VOUT1  
+1.8V/10A  
COMP  
C7  
R5  
4SEPC560M  
560uF,7mohm  
C13  
200pF  
5.36k  
M2  
IRFR3709Z  
LDRV  
C5  
R2  
1.43k  
6.8nF  
R3  
10k  
FB  
C6  
2.7nF  
GND  
R4  
8k  
Figure1 - Typical application of NX2309  
ORDERING INFORMATION  
Device  
NX2309CUTR  
NX2309CMTR  
Temperature  
Package  
MSOP - 10L  
MLPD - 10L  
Frequency  
300kHz  
300kHz  
Pb-Free  
Yes  
Yes  
0 to 70oC  
0 to 70oC  
Rev. 2.0  
12/19/05  
1

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