LM3697 Datasheet, PDF (1/36 Pages) Texas Instruments – High-Efficiency Three-String White LED Driver

LM3697
www.ti.com
SNOSCS2A – NOVEMBER 2013 – REVISED DECEMBER 2013
High-Efficiency Three-String White LED Driver
Check for Samples: LM3697
FEATURES
1
• 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
• 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 mm² Total Solution Size
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).
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.
APPLICATIONS
• Power Source for Smart Phone Illumination
• Display, Keypad and Indicator Illumination
Typical Application Circuit
VIN = 2.7V to 5.5V
V_IN
L
D1
CIN
IN
SDA
SCL
HWEN
PWM
SW
OVP
HVLED1
HVLED2
HVLED3
PGND
VOUT up to 40V
COUT
1
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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.
Copyright © 2013, Texas Instruments Incorporated