Datasheet > NX2309

NX2309

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
16页	445K
描述
SINGLE SUPPLY 12V SYNCHRONOUS PWM CONTROLLER WITH NMOS LDO CONTROLLER

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中文翻译

获取价格

数据手册

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NX2309 数据手册

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

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

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

Set Top Box and LCD Display

TYPICAL APPLICATION

R14

C12

1uF

VOUT1

+1.8V

IRFR3706

VCC

D1 MBR0530T1

L1 1uH

LDO OUT

LDO FB

47uF

VIN1

+12V

C10150pF

47uF

VOUT2

+1.2V/2A

BST

180uF

0.1uF

10k

150uF

25mohm

IRFR3709Z

HDRV

L2 1.5uH

VOUT1

+1.8V/10A

COMP

4SEPC560M

560uF,7mohm

C13

200pF

5.36k

IRFR3709Z

LDRV

1.43k

6.8nF

10k

2.7nF

GND

Figure1 - Typical application of NX2309

ORDERING INFORMATION

Device

NX2309CUTR

NX2309CMTR

Temperature

Package

MSOP - 10L

MLPD - 10L

Frequency

300kHz

Pb-Free

Yes

0 to 70^oC

Rev. 2.0

12/19/05

12 3 4 5 6 7...16

中文翻译

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