LM25116

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SNVS509D – APRIL 2007 – REVISED FEBRUARY 2013

Wide Range Synchronous Buck Controller

Check for Samples: LM25116

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FEATURES

DESCRIPTION

The LM25116 is a synchronous buck controller

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Emulated peak current mode

intended for step-down regulator applications from a

•

Wide operating range up to 42V

high voltage or widely varying input supply. The

•

control method is based upon current mode control

utilizing an emulated current ramp. Current mode

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Drives standard or logic level MOSFETs

control provides inherent line feed-forward, cycle by

•

Robust 3.5A peak gate drive

cycle current limiting and ease of loop compensation.

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Free-run or synchronous operation to 1 MHz

The use of an emulated control ramp reduces noise

sensitivity of the pulse-width modulation circuit,

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Optional diode emulation mode

allowing reliable control of very small duty cycles

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Programmable output from 1.215V to 36V

necessary in high input voltage applications. The

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Precision 1.5% voltage reference

operating frequency is programmable from 50 kHz to

1 MHz. The LM25116 drives external high-side and

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Programmable current limit

low-side NMOS power switches with adaptive dead-

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Programmable soft-start

time control. A user-selectable diode emulation mode

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Programmable line under-voltage lockout

enables discontinuous mode operation for improved

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Automatic switch to external bias supply

efficiency at light load conditions. A low quiescent

current

shutdown

disables

the

controller

and

•

HTSSOP-20 exposed pad

consumes less than 10 µA of total input current.

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Thermal shutdown

Additional features include a high voltage bias

regulator, automatic switch-over to external bias for

improved efficiency, thermal shutdown, frequency

synchronization, cycle by cycle current limit and

adjustable line under-voltage lockout. The device is

available in a power enhanced HTSSOP-20 package

featuring an exposed die attach pad to aid thermal

dissipation.

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PRODUCTION DATA information is current as of publication date.

Copyright © 2007–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.