40

45

50

55

60

65

70

75

80

85

90

95

100

0

0.5

1

1.5

2

2.5

3

Output Current (A)

G000

VOUT

VIN

LMZ31503

SENSE+

VADJ

AGND

PGND

PWRGD

RT/CLK

INH/UVLO

SS/TR

STSEL

PVIN

LMZ31503

www.ti.com

SNVS992 – JULY 2013

Check for Samples: LMZ31503

1

FEATURES

DESCRIPTION

The LMZ31503 SIMPLE SWITCHER® power module

2

•

Complete Integrated Power Solution Allows

is an easy-to-use integrated power solution that

Small Footprint, Low-Profile Design

combines

a

3-A

DC/DC

converter

with

power

•

9mm x 15mm x 2.8mm package

MOSFETs, a shielded inductor, and passives into a

- Pin Compatible with LMZ31506

low profile, QFN package. This total power solution

allows as few as 3 external components and

•

Efficiencies Up To 95%

eliminates the loop compensation and magnetics

•

Wide-Output Voltage Adjust

design process.

0.8 V to 5.5 V, with 1% Reference Accuracy

The 9×15×2.8 mm QFN package is easy to solder

•

Optional Split Power Rail Allows

onto a printed circuit board and allows a compact

Input Voltage Down to 1.6 V

point-of-load design with up to 95% efficiency and

•

Adjustable Switching Frequency

excellent power dissipation with a thermal impedance

(330 kHz to 780 kHz)

of 13°C/W junction to ambient. The device delivers

the full 3-A rated output current at 85°C ambient

•

Synchronizes to an External Clock

temperature without airflow.

•

Adjustable Slow-Start

The LMZ31503 offers the flexibility and the feature-

•

Output Voltage Sequencing / Tracking

set of a discrete point-of-load design and is ideal for

•

Power Good Output

powering performance DSPs and FPGAs. Advanced

•

Programmable Undervoltage Lockout (UVLO)

packaging technology afford a robust and reliable

power

solution

compatible

with

standard

QFN

•

Overcurrent Protection (Hiccup-Mode)

mounting and testing techniques.

•

Over Temperature Protection

•

Pre-bias Output Start-up

SIMPLIFIED APPLICATION

•

Operating Temperature Range: –40°C to 85°C

•

Enhanced Thermal Performance: 13°C/W

•

Meets EN55022 Class B Emissions

- Integrated Shielded Inductor

APPLICATIONS

•

Broadband & Communications Infrastructure

•

Automated Test and Medical Equipment

•

Compact PCI / PCI Express / PXI Express

•

DSP and FPGA Point of Load Applications

•

High Density Distributed Power Systems

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

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

2

SIMPLE SWITCHER is a registered trademark of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Copyright © 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.