nx2124 Microsemi Corporation, nx2124 Datasheet

nx2124

Manufacturer Part Number

nx2124

Description

300khz Synchronous Pwm Controller

Manufacturer

Microsemi Corporation

Datasheet

1.NX2124.pdf (17 pages)

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Rev.1.8

02/28/08

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.

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.

NX2124CSTR

NX2124ACSTR

Device

HI=SD

+5V

Vin

27pF

Temperature

0 to 70

2.2nF

37.4k

1uF

DESCRIPTION

100uF

300kHz SYNCHRONOUS PWM CONTROLLER

COMP

Figure1 - Typical application of 2124

Vcc

Package

SOIC-8L

Gnd

BST

Hdrv

Ldrv

MBR0530T1

n Fixed 300kHz voltage mode controller

n Internal Digital Soft Start Function

n Prebias Startup

n Less than 50 nS adaptive deadband

n Pb-free and RoHS compliant

Frequency

L2 1uH

300kHz

5V to 3.3V, 2.5V or 1.8V

Bus voltage operation from 2V to 25V

Current limit triggers hiccup by sensing Rdson of

Synchronous MOSFET

No negative spike at Vout during startup and

shutdown

Graphic Card on board converters

Memory Vddq Supply in mother board applications

On board DC to DC such as

Hard Disk Drive

Set Top Box

0.1uF

ORDERING INFORMATION

TYPICAL APPLICATION

1uF

L1 1.5uH

4.7nF

OCP Threshold

360mV

540mV

Evaluation board available.

PRELIMINARY DATA SHEET

10k

NX2124/2124A

APPLICATIONS

Cin

280uF

18mohm

2 x (1500uF,13mohm)

Pb Free Product

FEATURES

Pb-Free

Yes

Vout

+1.8V 9A

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