PVIN

SW

AGND

FB

PGOOD

EN

SS/TRK

AVIN

COMP

LM20136

L

VCC

PGND

(optional)

SYNC

LM20136

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SNVS564B – JANUARY 2009 – REVISED APRIL 2013

LM20136 6A, Synchronous Buck Regulator with Input Synchronization

Check for Samples: LM20136

1

FEATURES

DESCRIPTION

The LM20136 is a full featured synchronous buck

2

•

Input Voltage Range 2.95V to 5.5V

regulator capable of delivering up to 6A of continuous

•

Accurate Current Limit Minimizes Inductor

output current. The current mode control loop can be

Size

compensated to be stable with virtually any type of

•

97% Peak Efficiency

output capacitor. For most cases, compensating the

device

only

requires

two

external

components,

•

Frequency Synchronization Pin

providing maximum flexibility and ease of use. The

•

16m

Ω and 20mΩ Integrated FET Switches

device is optimized to work over the input voltage

•

Starts up Into Pre-biased Loads

range of 2.95V to 5.5V making it suitable for a wide

variety of low voltage systems.

•

Output Voltage Tracking

•

Peak Current Mode Control

The device features internal over voltage protection

(OVP) and over current protection (OCP) circuits for

•

Adjustable Output Voltage Down to 0.8V

increased system reliability. A precision enable pin

•

Adjustable Soft-Start with External Capacitor

and integrated UVLO allows the turn on of the device

•

Precision Enable Pin with Hysteresis

to be tightly controlled and sequenced. Start-up

inrush currents are limited by both an internally fixed

•

Integrated OVP, UVLO, Power Good and

and externally adjustable Soft-Start circuit. Fault

Thermal Shutdown

detection and supply sequencing are possible with

•

16-Pin HTSSOP exposed Pad Package

the integrated power good circuit.

The switching frequency of the LM20136 can be

APPLICATIONS

synchronized to an external clock by use of the

•

Simple to Design, High Efficiency Point of

SYNC pin. The SYNC pin is capable of synchronizing

Load Regulation from a 5V or 3.3V Bus

to input signals ranging from 500 kHz to 1.5 MHz

•

High Performance DSPs, FPGAs, ASICs and

The LM20136 is designed to work well in multi-rail

Microprocessors

power supply architectures. The output voltage of the

•

Broadband, Networking and Optical

device can be configured to track a higher voltage rail

using the SS/TRK pin. If the output of the LM20136 is

Communications Infrastructure

pre-biased at startup it will not pull the ouput low.

The LM20136 is offered in a 16-pin HTSSOP

package with an exposed pad that can be soldered to

the PCB, eliminating the need for bulky heatsinks.

Typical Application Circuit

1

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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2009–2013, 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.