PVIN

SW

AGND

FB

PGOOD

EN

SS/TRK

AVIN

COMP

LM20144

L

VCC

PGND

RT

(optional)

LM20144

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SNVS529G – OCTOBER 2007 – REVISED MARCH 2013

Check for Samples: LM20144

1

FEATURES

DESCRIPTION

The LM20144 is a full featured adjustable frequency

2

•

Available in AEC-Q100 Temperature Grade 1

synchronous buck regulator capable of delivering up

•

Input Voltage Range 2.95V to 5.5V

to 4A of continuous output current. The current mode

•

Accurate Current Limit Minimizes Inductor

control loop can be compensated to be stable with

Size

virtually any type of output capacitor. For most cases,

compensating the device only requires two external

•

97% Peak Efficiency

components, providing maximum flexibility and ease

•

Adjustable Switching Frequency (500 kHz - 1.5

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

MHz)

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

•

32 m

Ω Integrated FET Switches

wide variety of low voltage systems.

•

Starts up into Pre-Biased Loads

The device features internal over voltage protection

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

•

Output Voltage Tracking

increased system reliability. A precision enable pin

•

Peak Current Mode Control

and integrated UVLO allows the turn-on of the device

•

Adjustable Output Voltage Down to 0.8V

to be tightly controlled and sequenced. Start-up

•

Adjustable Soft-Start with External Capacitor

inrush currents are limited by both an internally fixed

and externally adjustable Soft-Start circuit. Fault

•

Precision Enable Pin with Hysteresis

detection and supply sequencing is possible with the

•

Integrated OVP, UVLO, Power Good and

integrated power good circuit.

Thermal Shutdown

The LM20144 is designed to work well in multi-rail

•

HTSSOP 16-Pin Exposed Pad Package

power supply architectures. The output voltage of the

device can be configured to track a higher voltage rail

APPLICATIONS

using the SS/TRK pin. If the output of the LM20144 is

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

•

Simple to Design, High Efficiency Point of

output low until the internal soft-start ramp exceeds

Load Regulation from a 5V or 3.3V Bus

the voltage at the feedback pin.

•

High Performance DSPs, FPGAs, ASICs and

The frequency of this device can be adjusted from

Microprocessors

500 kHz to 1.5 MHz by connecting an external

•

Broadband, Networking and Optical

resistor from the RT pin to ground.

Communications Infrastructure

The LM20144 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

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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.