LM3699 High-Efficiency White LED Driver | TI.com


High-Efficiency White LED Driver

High-Efficiency White LED Driver - LM3699


The LM3699 is a three-string, high-efficiency, PWM-controlled power source for display backlight or keypad LEDs in smartphone handsets. The high-voltage inductive boost converter with integrated 1-A, 40-V MOSFET provides the power for three series LED strings. The boost output automatically adjusts to LED forward voltage to minimize headroom voltage and effectively improve LED efficiency.

The ILOW terminal provides a method to quickly reduce LED brightness during camera flash operation.

The LM3699 has integrated overvoltage, overcurrent, and thermal protection.

The device operates over a 2.7-V to 5.5-V input voltage range and a −40°C to 85°C temperature range.


  • Drives Parallel High-Voltage LED Strings
    for Display or Keypad Lighting
  • Boost Converter up to 90% Efficiency
  • Four User-Selectable Full-Scale Current Settings
    (20.2 mA, 18.6 mA, 17.0 mA, 15.4 mA)
  • Quick-Dimming Enable Terminal (ILOW)
  • Simple PWM Duty Cycle Control
  • 24-V Overvoltage Protection Threshold
  • Fixed 1-MHz Switching Frequency
  • Integrated 1-A/40-V MOSFET
  • Three Current Sink Terminals
  • Adaptive Boost Output to LED Voltages
  • Thermal Shutdown Protection
  • 29-mm2 Total Solution Size


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Part number Order Channels (#) Vin (Min) (V) Vin (Max) (V) Vout (Min) (V) Vout (Max) (V) Switching frequency (Max) (kHz) Type LED current per channel (mA) LED (#) Topology Shutdown current (Typ) (uA) Peak efficiency (%) LED configuration Function Features Operating temperature range (C) Package Group Package size: mm2:W x L (PKG)
LM3699 Order now 3     2.7     5.5     0     24     1120     Inductive     20.2     21     Boost     1     90     Parallel
Backlight     CABC
Direct PWM Dimming
Integrated Switch
PWM Control
Synchronous Rectification
Thermal Shutdown    
-40 to 125     DSBGA | 12     See datasheet (DSBGA)    
LM3630A Order now 2     2.3     5.5     12     40     1120     Inductive     28.5     20     Boost     1     87     Dual       I2C Control
PWM Control
Soft Start
Thermal Shutdown    
-40 to 85     DSBGA | 12     See datasheet (DSBGA)    
LM3697 Order now 3     2.7     5.5     0     40     1100     Inductive     30     30     Boost     1     91     Parallel     Backlighting, LED driver     I2C Control
PWM Control    
-40 to 125     DSBGA | 12     See datasheet (DSBGA)    
TPS61161 Order now 1     2.7     18     2.7     38     600     Inductive     20     10     Boost     1     90     Series       EasyScale 1-Wire Interface
Load Disconnect During Shutdown    
-40 to 85     WSON | 6     See datasheet (WSON)