lm5088mhx-2 National Semiconductor Corporation, lm5088mhx-2 Datasheet

lm5088mhx-2

Manufacturer Part Number

lm5088mhx-2

Description

Wide Input Range Non-synchronous Buck Controller

Manufacturer

National Semiconductor Corporation

Datasheet

1.LM5088MHX-2.pdf (26 pages)

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LM5088

Wide Input Range Non-Synchronous Buck Controller

General Description

The LM5088 high voltage non-synchronous buck controller

features all the necessary functions to implement an efficient

high voltage buck converter using a minimum number of ex-

ternal components. The LM5088 can be configured to operate

over an ultra-wide input voltage range of 4.5V to 75V. This

easy to use controller includes a level shifted gate driver ca-

pable of controlling an external N-channel buck switch. The

control method is based upon peak current mode control uti-

lizing an emulated current ramp. The use of an emulated

control ramp reduces noise sensitivity of the pulse-width mod-

ulation circuit, allowing reliable control of very small duty

cycles necessary in high input voltage/low output voltage ap-

plications. The LM5088 switching frequency is programmable

from 50 kHz to 1 MHz.

The LM5088 is available in two versions: The LM5088-1 pro-

vides a +/-5% frequency dithering function to reduce the

conducted and radiated EMI, while the LM5088-2 provides a

versatile restart timer for overload protection. Additional fea-

tures include a low dropout bias regulator, tri-level enable

input to control shutdown and standby modes, soft-start and

oscillator synchronization capability. The device is available

in a thermally enhanced TSSOP-16EP pin package.

Simplified Application Schematic

300839

Features

■

Package

■

Emulated current mode control

Drives external high-side N-channel MOSFET

Ultra-wide input voltage range from 4.5V to 75V

Low I

High duty cycle ratio feature for reduced dropout voltage

Spread spectrum EMI reduction (LM5088-1)

Hiccup timer for overload protection (LM5088-2)

Adjustable output voltage from 1.205V with 1.5% feedback

reference accuracy

Wide bandwidth error amplifier

Single resistor oscillator frequency setting

Oscillator synchronization capability

Programmable soft-start

High voltage, low dropout bias regulator

Thermal shutdown protection

TSSOP-16EP

Shutdown and Standby modes

December 7, 2008

www.national.com

30083901

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