LM3697 3 String Backlight Driver with 11-bits of Exponential Dimming | TI.com

LM3697 (ACTIVE)

3 String Backlight Driver with 11-bits of Exponential Dimming

 

Description

The LM3697 11-bit LED driver provides high-performance backlight dimming for 1, 2, or 3 series LED strings while delivering up to 90% efficiency. The boost converter with integrated 1-A, 40-V MOSFET automatically adjusts to LED forward voltage to minimize headroom voltage and effectively improve LED efficiency.

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

For all available packages, see the orderable addendum at the end of the data sheet.

Features

  • Drives Three Parallel High-Voltage LED Strings for Display and Keypad Lighting
  • High-Voltage Strings Capable of up to 40-V 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
  • Integrated 1-A/40-V MOSFET
  • Adaptive Boost Output to LED Voltages
  • Selectable 500-kHz and 1-MHz Switching Frequency
  • Four Configurable Overvoltage Protection Thresholds (16 V, 24 V, 32 V, and 40 V)
  • Overcurrent Protection
  • Thermal Shutdown Protection
  • 29-mm2 Total Solution Size

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Parametrics Compare all products in Backlight LED drivers

 
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)
LM3697 LM36272 LM36273 LM3630A LM3631 LM3632A LM36922 LM36922H LM36923 LM36923H LM3699 TPS61161 TPS61162A TPS61165 TPS61169
3     2     3     2     2     2     2     2     3     3     3     1     2     1     1    
2.7     2.7     2.7     2.3     2.7     2.7     2.5     2.5     2.5     2.5     2.7     2.7     2.7     3     2.7    
5.5     5     5     5.5     5.0     5.5     5.5     5.5     5.5     5.5     5.5     18     6.5     18     5.5    
0     27     27     12     0     0     0     37     0     0     0     2.7     2.7     3     2.7    
40     30     30     40     30     29.5     29.5     40     29.5     37     24     38     26.5     38     38    
1100     1050     1050     1120     1100     1100     1050     1050     1050     1050     1120     600     1200     1200     1500    
Inductive     Inductive     Inductive     Inductive     Inductive     Inductive     Inductive     Inductive     Inductive     Inductive     Inductive     Inductive     Inductive     Inductive     Inductive    
30     30     30     28.5     25     25     25     30     25     30     20.2     20     30     400     400    
30     16     24     20     16