PVIN

SW

AGND

FB

PGOOD

EN

SS/TRK

AVIN

COMP

LM20143

L

VCC

PGND

RT

(optional)

Product

Folder

Sample &

Buy

Technical

Documents

Tools &

Software

Support &

Community

LM20143, LM20143-Q1

SNVS528H – OCTOBER 2007 – REVISED JANUARY 2016

LM20143/LM20143-Q1 3-A PowerWise™ Adjustable Frequency Synchronous Buck

Regulator

1 Features

3 Description

The LM20143 devices are full featured PowerWise™

1

•

Available in AEC-Q100 Temperature Grade 1

adjustable frequency synchronous buck regulators

•

Input Voltage Range: 2.95 V to 5.50 V

capable of delivering up to 3 A of continuous output

•

Accurate Current Limit Minimizes Inductor Size

current. The current mode control loop can be

compensated to be stable with virtually any type of

•

97% Peak Efficiency

output capacitor. For most cases, compensating the

•

Adjustable Output Voltage Down to 0.80 V

device

only

requires

two

external

components,

•

Adjustable Switching Frequency (500 kHz to 1.5

providing maximum flexibility and ease of use. The

MHz)

device is optimized to work over the input voltage

range of 2.95 V to 5.5 V, making it suited for a wide

•

32-m

Ω Integrated FET Switches

variety of low voltage systems.

•

Starts into Prebiased Loads

The device features internal over voltage protection

•

Output Voltage Tracking

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

•

Peak Current Mode Control

increased system reliability. A precision enable pin

•

Adjustable Soft-Start with External Capacitor

and integrated UVLO allows the turn-on of the device

to be tightly controlled and sequenced. Start-up

•

Precision Enable Pin with Hysteresis

inrush currents are limited by both an internally fixed

•

Integrated OVP, UVLO, Power Good and Thermal

and externally adjustable Soft-Start circuit. Fault

Shutdown

detection and supply sequencing is possible with the

integrated power good circuit.

2 Applications

The frequency of this device can be adjusted from

•

Simple to Design, High Efficiency Point of Load

500 kHz to 1.5 MHz by connecting an external

Regulation from a 5-V or 3.3-V Bus

resistor from the RT pin to ground.

•

High Performance DSPs, FPGAs, ASICs, and

The LM20143 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

Communications Infrastructure

using the SS/TRK pin. If the output of the LM20143 is

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

output low until the internal soft-start ramp exceeds

the voltage at the feedback pin.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

LM20143

HTSSOP (16)

4.40 mm × 5.00 mm

LM20143-Q1

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Typical Application Circuit

1

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.