PVIN

SW

AGND

FB

PGOOD

EN

SS/TRK

AVIN

COMP

LM20154

L

VCC

PGND

SYNCOUT

(optional)

SYNCOUT

LM20154

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SNVS531G – OCTOBER 2007 – REVISED MARCH 2013

LM20154/LM20154-Q1 4A, 1MHz Synchronous Buck Regulator with SYNCOUT

Check for Samples: LM20154

1

FEATURES

DESCRIPTION

The LM20154 is a full featured 1 MHz synchronous

2

•

LM20154-Q1 is AEC-Q100 Qualified and

buck regulator capable of delivering up to 4A of

Manufactured on an Automotive Grade Flow

continuous output current. The current mode control

•

Input Voltage Range 2.95V to 5.5V

loop can be compensated to be stable with virtually

•

Accurate Current Limit Minimizes Inductor

any type of output capacitor. For most cases,

compensating the device only requires two external

Size

components, providing maximum flexibility and ease

•

96% Peak Efficiency at 1.0 MHz Switching

of use. The device is optimized to work over the input

Frequency

voltage range of 2.95V to 5.5V making it suited for a

•

Frequency Synchronization Output

wide variety of low voltage systems.

•

32 m

Ω Integrated FET Switches

The device features internal over voltage protection

•

Starts up into Pre-Biased Loads

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

increased system reliability. A precision enable pin

•

Output Voltage Tracking

and integrated UVLO allows the turn on of the device

•

Peak Current Mode Control

to be tightly controlled and sequenced. Start-up

•

Adjustable Output Voltage Down to 0.8V

inrush currents are limited by both an internally fixed

and externally adjustable Soft-Start circuit. Fault

•

Adjustable Soft-Start with External Capacitor

detection and supply sequencing is possible with the

•

Precision Enable Pin with Hysteresis

integrated power good circuit.

•

Integrated OVP, UVLO, Power Good and

The LM20154 features an open drain SYNCOUT pin

Thermal Shutdown

which provides an external clock that matches the

•

HTSSOP Exposed Pad Package

switching frequency of the device but is shifted by

180 degrees.

APPLICATIONS

The LM20154 is designed to work well in multi-rail

•

Simple to Design, High Efficiency Point of

power supply architectures. The output voltage of the

Load Regulation from a 5V or 3.3V Bus

device can be configured to track a higher voltage rail

using the SS/TRK pin. If the output of the LM20154 is

•

High Performance DSPs, FPGAs, ASICs and

pre-biased at startup it will not sink current to pull the

Microprocessors

output low until the internal soft-start ramp exceeds

•

Broadband, Networking and Optical

the voltage at the feedback pin.

Communications Infrastructure

The LM20154 is offered in an exposed pad 16-pin

HTSSOP package 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 © 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.