NX2124A

更新时间： 2024-11-17 06:00:39

品牌	Logo	应用领域
美高森美 - MICROSEMI		控制器
页数	文件大小	规格书
17页	517K
描述
300kHz SYNCHRONOUS PWM CONTROLLER

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中文翻译

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数据手册

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NX2124A 数据手册

Evaluation board available.

NX2124/2124A

300kHz SYNCHRONOUS PWM CONTROLLER

PRELIMINARY DATA SHEET

Pb Free Product

FEATURES

DESCRIPTION

Bus voltage operation from 2V to 25V

The NX2124/2124A controller IC is a synchronous Buck

controller IC designed for step down DC to DC con-

verter applications. It is optimized to convert bus volt-

ages from 2V to 25V to outputs as low as 0.8V voltage.

The NX2124/2124A operates at fixed 300kHz, employs

fixed loss-less current limiting by sensing the Rdson of

synchronous MOSFET followed by hiccup feature.

NX2124A has higher current limit threshold than NX2124.

Feedback under voltage also triggers hiccup.

n Fixed 300kHz voltage mode controller

n Internal Digital Soft Start Function

n Prebias Startup

n Less than 50 nS adaptive deadband

Current limit triggers hiccup by sensing Rdson of

Synchronous MOSFET

No negative spike at Vout during startup and

shutdown

n Pb-free and RoHS compliant

Other features of the device are: 5V gate drive,Adaptive

deadband control, Internal digital soft start, Vcc

undervoltage lock out and shutdown capability via the

comp pin.

APPLICATIONS

Graphic Card on board converters

Memory Vddq Supply in mother board applications

On board DC to DC such as

5V to 3.3V, 2.5V or 1.8V

Hard Disk Drive

Set Top Box

TYPICAL APPLICATION

L2 1uH

Vin

+5V

100uF

1uF

Cin

280uF

18mohm

MBR0530T1

1uF

0.1uF

Vcc

BST

Hdrv

COMP

L1 1.5uH

HI=SD

Vout

37.4k

Ldrv

+1.8V 9A

27pF

2 x (1500uF,13mohm)

2.2nF

4.7nF

10k

Gnd

Figure1 - Typical application of 2124

ORDERING INFORMATION

Device

NX2124CSTR

NX2124ACSTR

Temperature

0 to 70^oC

Package

SOIC-8L

Frequency

300kHz

OCP Threshold

360mV

Pb-Free

Yes

540mV

Rev.1.8

02/28/08

12 3 4 5 6 7...17

中文翻译

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