LM5118, LM5118-Q1

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SNVS566G – APRIL 2008 – REVISED FEBRUARY 2013

Wide Voltage Range Buck-Boost Controller

Check for Samples: LM5118, LM5118-Q1

1

FEATURES

DESCRIPTION

The

LM5118

wide

voltage

range

Buck-Boost

2

•

LM5118-Q1 is an Automotive Grade product

switching regulator controller features all of the

that is AEC-Q100 grade 1 qualified (-40°C to

functions

necessary

to

implement

a

high

125°C operating junction temperature)

performance,

cost

efficient

Buck-Boost

regulator

•

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

using a minimum of external components. The Buck-

Boost topology maintains output voltage regulation

•

Emulated peak current mode control

when the input voltage is either less than or greater

•

Smooth transition between step-down and

than the output voltage making it especially suitable

step- up modes

for automotive applications. The LM5118 operates as

•

Switching frequency programmable to 500KHz

a buck regulator while the input voltage is sufficiently

greater

than

the

regulated

output

voltage

and

•

Oscillator synchronization capability

gradually transitions to the buck-boost mode as the

•

Internal high voltage bias regulator

input voltage approaches the output. This dual mode

•

Integrated high and low-side gate drivers

approach maintains regulation over a wide range of

•

Programmable soft-start time

input voltages with optimal conversion efficiency in

the buck mode and a glitch-free output during mode

•

Ultra low shutdown current

transitions. This easy to use controller includes

•

Enable input wide bandwidth error amplifier

drivers for the high side buck MOSFET and the low

•

1.5% feedback reference accuracy

side boost MOSFET. The regulators control method

is based upon current mode control utilizing an

•

Thermal shutdown

emulated current ramp. Emulated current mode

control reduces noise sensitivity of the pulse-width

PACKAGE

modulation circuit, allowing reliable control of the very

•

HTSSOP-20 (Exposed pad)

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

HTSSOP-20 package featuring an exposed die attach

pad to aid thermal dissipation.

1

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2

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PRODUCTION DATA information is current as of publication date.

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Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.