NX2154A

更新时间： 2024-11-18 06:00:43

品牌	Logo	应用领域
美高森美 - MICROSEMI		控制器
页数	文件大小	规格书
17页	556K
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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NX2154A 数据手册

Evaluation board available.

NX2154/2154A

300kHz SYNCHRONOUS PWM CONTROLLER

PRELIMINARY DATA SHEET

Pb Free Product

FEATURES

DESCRIPTION

Bus voltage operation from 2V to 40V

The NX2154/2154A 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 40V to outputs as low as 0.8V voltage.

The NX2154/2154A operates at fixed 300kHz. The

NX2154/2154A employs fixed loss-less current limiting

by sensing the Rdson of synchronous MOSFET followed

by hiccup feature.NX2154A has higher current limit

threshold than NX2154. 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

Vin

+33V

+5V

MBR0530T1

1uF

50ME180WX

1uF

BST

Vcc

0.1uF

M1A STM6920

15uH

Comp

Hdrv

12nF

HI=SD

Vout

+5V,3A

82pF

Ldrv

13.3k

M1B

6ME1000WG(1000uF,30mohm)

Gnd

191

Figure1 - Typical application of 2154

ORDERING INFORMATION

Device

NX2154CSTR

NX2154ACSTR

Temperature

0 to 70^oC

Package

SOIC-8L

Frequency

300kHz

OCP Threshold

360mV

Pb-Free

Yes

540mV

Rev.1.2

02/26/07

12 3 4 5 6 7...17

中文翻译

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