IN

SW

HVLED1

PGND

HWEN

SDA

SCL

COUT

CIN

L

D1

PWM

OVP

VIN = 2.7V to 5.5V

VOUT up to 40V

HVLED3

HVLED2

LM3697

www.ti.com

SNOSCS2A – NOVEMBER 2013 – REVISED DECEMBER 2013

High-Efficiency Three-String White LED Driver

Check for Samples: LM3697

1

FEATURES

DESCRIPTION

The LM3697 is a high-efficiency three string power

•

Drives Three Parallel High-Voltage LED Strings

source for backlight or keypad LEDs in smart-phone

for Display and Keypad Lighting

handsets. The high-voltage inductive boost converter

•

High-Voltage Strings Capable of up to 40V

provides the power for three series LED strings for

Output Voltage and up to 90% Efficiency

display backlight and keypad functions (HVLED1,

HVLED2 and HVLED3).

•

Up to 30 mA per Current Sink

•

11-Bit Configurable Dimming Resolution

An additional feature is a Pulse Width Modulation

(PWM) control input for content adjustable backlight

•

PWM Input for Content Adjustable Brightness

control, which can be used to control any high-

Control (CABC)

voltage current sink.

•

Fully Configurable LED Grouping and Control

The

LM3697

is

fully

configurable

via

an

•

Four Configurable Over-Voltage Protection

compatible interface. The device is available in a 12-

Thresholds (16V, 24V, 32V, and 40V)

bump (1.26 mm ± 30 µm x 1.61 mm ± 30 µm x 0.6

•

Selectable 500 kHz and 1MHz Switching

mm ± 75 um) DSBGA and operates over a 2.7V to

Frequency

5.5V input voltage range and a

−40°C to +85°C

temperature range.

•

APPLICATIONS

•

Power Source for Smart Phone Illumination

•

Display, Keypad and Indicator Illumination

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.

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.