Datasheet > LM3697_15

LM3697_15

更新时间： 2022-10-12 16:22:35

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High-Efficiency Three-String White LED Driver

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LM3697_15 数据手册

LM3697

www.ti.com

SNOSCS2A –NOVEMBER 2013–REVISED DECEMBER 2013

High-Efficiency Three-String White LED Driver

Check for Samples: LM3697

FEATURES

DESCRIPTION

The LM3697 is a high-efficiency three string power

source for backlight or keypad LEDs in smart-phone

handsets. The high-voltage inductive boost converter

provides the power for three series LED strings for

display backlight and keypad functions (HVLED1,

HVLED2 and HVLED3).

•

Drives Three Parallel High-Voltage LED Strings

for Display and Keypad Lighting

•

High-Voltage Strings Capable of up to 40V

Output Voltage and up to 90% Efficiency

•

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

control, which can be used to control any high-

voltage current sink.

The LM3697 is fully configurable via an I²C-

compatible interface. The device is available in a 12-

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

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

5.5V input voltage range and a −40°C to +85°C

temperature range.

PWM Input for Content Adjustable Brightness

Control (CABC)

•

Fully Configurable LED Grouping and Control

Four Configurable Over-Voltage Protection

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

•

Selectable 500 kHz and 1MHz Switching

Frequency

30 mm²Total Solution Size

APPLICATIONS

•

Power Source for Smart Phone Illumination

Display, Keypad and Indicator Illumination

Typical Application Circuit

VOUT up to 40V

VIN = 2.7V to 5.5V

CIN

COUT

OVP

SDA

SCL

HVLED1

HVLED2

HVLED3

HWEN

PWM

PGND

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.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

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