GND

FB

SHDN

L

22 PH

LM3500-16

AGND

A1

NC

C3

B1

C1

C2

B3

A2

A3

<0.3V

>1.1V

2.7V - 5.5V

R2

24:

1PF

Ceramic

1PF

Ceramic

LM3500

www.ti.com

SNVS231G – AUGUST 2003 – REVISED MAY 2013

LM3500 Synchronous Step-up DC/DC Converter for White LED Applications

Check for Samples: LM3500

1

FEATURES

APPLICATIONS

2

•

Synchronous Rectification, High Efficiency

•

LCD Bias Supplies

and no External Schottky Diode Required

•

White LED Backlighting

•

Uses Small Surface Mount Components

•

Handheld Devices

•

Can Drive 2-5 White LEDs in Series

•

Digital Cameras

–

•

Portable Applications

•

2.7V to 7V Input Range

DESCRIPTION

•

Internal Output Over-Voltage Protection (OVP)

The LM3500 is a fixed-frequency step-up DC/DC

Circuitry, with no External Zener Diode

converter that is ideal for driving white LEDs for

Required

display backlighting and other lighting functions. With

–

LM3500-16: 15.5V OVP; LM3500-21: 20.5V

fully intergrated synchronous switching (no external

OVP.

schottky diode required) and a low feedback voltage

•

True Shutdown Isolation

(500mV), power efficiency of the LM3500 circuit has

been optimized for lighting applications in wireless

•

Input Undervoltage Lockout

phones and other portable products (single cell Li-Ion

•

Requires Only Small Ceramic Capacitors at the

or 3-cell NiMH battery supplies). The LM3500

Input and Output

operates with a fixed 1MHz switching frequency.

•

Thermal Shutdown

When used with ceramic input and output capacitors,

the LM3500 provides a small, low-noise, low-cost

•

0.1µA Shutdown Current

solution.

•

Small 8-Bump Thin DSBGA Package

Typical Application Circuit

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

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2003–2013, 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.