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LM5118 Wide Voltage Range Buck-Boost Controller

April 30, 2008

LM5118

Wide Voltage Range Buck-Boost Controller

General Description

The LM5118 wide voltage range Buck-Boost switching regu-

lator controller features all of the functions necessary to im-

plement a high performance, cost efficient Buck-Boost

regulator using a minimum of external components. The

Buck-Boost topology maintains output voltage regulation

when the input voltage is either less than or greater than the

output voltage making it especially suitable for automotive

applications. The LM5118 operates as a buck regulator while

the input voltage is sufficiently greater than the regulated out-

put voltage and gradually transitions to the buck-boost mode

as the input voltage approaches the output. This dual mode

approach maintains regulation over a wide range of input

voltages with optimal conversion efficiency in the buck mode

and a glitch-free output during mode transitions. This easy to

use controller includes drivers for the high side buck MOSFET

and the low side boost MOSFET. The regulator鈥檚 control

method is based upon current mode control utilizing an em-

ulated current ramp. Emulated current mode control reduces

noise sensitivity of the pulse-width modulation circuit, allow-

ing reliable control of the very small duty cycles necessary in

high input voltage applications. Additional protection features

include current limit, thermal shutdown and an enable input.

The device is available in a power enhanced TSSOP-20

package featuring an exposed die attach pad to aid thermal

dissipation.

Features

鈻?/div>

Ultra-wide input voltage range from 3V to 75V

Emulated peak current mode control

Smooth transition between step-down and step- up modes

Switching frequency programmable to 500KHz

Oscillator synchronization capability

Internal high voltage bias regulator

Integrated high and low-side gate drivers

Programmable soft-start time

Ultra low shutdown current

Enable input wide bandwidth error amplifier

1.5% feedback reference accuracy

Thermal shutdown

Package

TSSOP-20EP (Exposed pad)

Typical Application Circuit

30058501

漏 2008 National Semiconductor Corporation

300585

www.national.com

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