LM5116-HT

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SLVSBS8B – OCTOBER 2013 – REVISED JANUARY 2014

WIDE RANGE SYNCHRONOUS BUCK CONTROLLER

Check for Samples: LM5116-HT

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FEATURES

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Emulated Peak Current Mode

SUPPORTS EXTREME TEMPERATURE

APPLICATIONS

•

Wide Operating Range Up to 80 V

•

Controlled Baseline

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Low IQ Shutdown (< 10 µA)

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One Assembly and Test Site

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Drives Standard or Logic Level MOSFETs

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One Fabrication Site

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Robust 3.5-A Peak Gate Drive

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Available in Extreme (–55°C to 175°C)

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Free-Run or Synchronous Operation to 1 MHz

Temperature Range

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Optional Diode Emulation Mode

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Extended Product Life Cycle

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Programmable Output from 1.215 V to 80 V

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Extended Product-Change Notification

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Precision 1.5% Voltage Reference

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Product Traceability

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Programmable Current Limit

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Texas Instruments' high temperature products

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Programmable Soft-Start

utilize highly optimized silicon (die) solutions

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Programmable Line Under-Voltage Lockout

with design and process enhancements to

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Automatic Switch to External Bias Supply

maximize performance over extended

temperatures.

APPLICATIONS

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Down-Hole Drilling

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High Temperature Environments

DESCRIPTION

The LM5116 is a synchronous buck controller intended for step-down regulator applications from a high voltage

or widely varying input supply. The control method is based upon current mode control utilizing an emulated

current ramp. Current mode control provides inherent line feed-forward, cycle by cycle current limiting and ease

of loop compensation. The use of an emulated control ramp reduces noise sensitivity of the pulse-width

modulation circuit, allowing reliable control of very small duty cycles necessary in high input voltage applications.

The operating frequency is programmable from 50 kHz to 1 MHz. The LM5116 drives external high-side and low-

side NMOS power switches with adaptive dead-time control. A user-selectable diode emulation mode enables

discontinuous mode operation for improved efficiency at light load conditions. A low quiescent current shutdown

disables the controller and consumes less than 10 µA of total input current. 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.

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PRODUCTION DATA information is current as of publication date.

Copyright © 2013–2014, 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.