nx2119 Microsemi Corporation, nx2119 Datasheet

nx2119

Manufacturer Part Number

nx2119

Description

Synchronous Pwm Controller With Current Limit Protection

Manufacturer

Microsemi Corporation

Datasheet

1.NX2119.pdf (16 pages)

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Rev.3.2

04/10/08

The NX2119 controller IC is a synchronous Buck con-

troller IC designed for step down DC to DC converter

applications. It is optimized to convert bus voltages from

2V to 25V to outputs as low as 0.8V voltage. The

NX2119 operates at fixed 300kHz, while NX2119A oper-

ates at fixed 600kHz, making it ideal for applications

requiring ceramic output capacitors. The NX2119 em-

ploys fixed loss-less current limiting by sensing the Rdson

of synchronous MOSFET followed by latch out feature.

Feedback under voltage 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.

NX2119CSTR

NX2119ACSTR

NX2119ACUTR

HI=SD

Device

+5V

Vin

27pF

2.2nF

37.4k

1uF

100uF

DESCRIPTION

Temperature

0 to 70

COMP

Figure1 - Typical application of 2119

SYNCHRONOUS PWM CONTROLLER WITH

Vcc

Gnd

BST

Hdrv

Ldrv

MBR0530T1

SOIC - 8L

MSOP - 8L

Package

L2 1uH

n Fixed 300kHz and 600kHz

n Internal Digital Soft Start Function

n Prebias Startup

n Less than 50 nS adaptive deadband

n Pb-free and RoHS compliant

Bus voltage operation from 2V to 25V

Current limit triggers latch out by sensing Rdson of

Synchronous MOSFET

No negative spike at Vout during startup and

shutdown

Graphic Card on board converters

Memory Vddq Supply

On board DC to DC such as

12V to 3.3V, 2.5V or 1.8V

ADSL Modem

CURRENT LIMIT PROTECTION

0.1uF

ORDERING INFORMATION

1uF

TYPICAL APPLICATION

L1 1.5uH

4.7nF

Frequency

300kHz

600kHz

10k

Evaluation board available.

PRELIMINARY DATA SHEET

NX2119/2119A

280uF

18mohm

Cin

APPLICATIONS

2 x (1500uF,13mohm)

Pb Free Product

Pb-Free

FEATURES

Yes

Vout

+1.8V 9A

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