FB

VIN

VCC

RT/SYNC

HB

EN

L

LM5116WG

COMP

AGND

CSG

RAMP

SS

CS

PGND

LO

VOUT

HO

SW

UVLO

VCCX

DEMB

LM5116WG

www.ti.com

SNVS599D – OCTOBER 2008 – REVISED FEBRUARY 2013

LM5116WG Wide Range Synchronous Buck Controller

Check for Samples: LM5116WG

1

FEATURES

DESCRIPTION

The LM5116WG is a synchronous buck controller

2

•

Hermetic Package for Harsh Operating

intended for step-down regulator applications from a

Environments

high voltage or widely varying input supply. The

•

Emulated Peak Current Mode

control method is based upon current mode control

•

Wide Operating Range up to 100V

utilizing an emulated current ramp. Current mode

control provides inherent line feed-forward, cycle by

•

cycle current limiting and ease of loop compensation.

•

Drives Standard or Logic Level MOSFETs

The use of an emulated control ramp reduces noise

•

Robust 3.5A Peak Gate Drive

sensitivity of the pulse-width modulation circuit,

allowing reliable control of very small duty cycles

•

Free-Run or Synchronous Operation to 1 MHz

necessary in high input voltage applications. The

•

Optional Diode Emulation Mode

operating frequency is programmable from 50 kHz to

•

Programmable Output from 1.215V to 80V

1 MHz. The LM5116WG drives external high-side and

low-side NMOS power switches with adaptive dead-

•

Precision 1.5% Voltage Reference

time control. A user-selectable diode emulation mode

•

Programmable Current Limit

enables discontinuous mode operation for improved

•

Programmable Soft-Start

efficiency at light load conditions. A low quiescent

current

shutdown

disables

the

controller

and

•

Programmable Line Under-Voltage Lockout

consumes less than 10 µA of total input current.

•

Automatic Switch to External Bias Supply

Additional features include a high voltage bias

•

CPGA-20 with No Thermal Shutdown

regulator, automatic switch-over to external bias for

improved efficiency, frequency synchronization, cycle

by cycle current limit and adjustable line under-

voltage lockout. The device is available in a CPGA-20

high temperature ceramic package with the thermal

shutdown feature disabled.

Typical Application

1

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2

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PRODUCTION DATA information is current as of publication date.

Copyright © 2008–2013, 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.