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3 String Backlight Driver with 11-bits of Exponential Dimming


Package | PIN: YFQ | 12
Temp: Q (-40 to 125)
Carrier: Cut Tape
Qty Price
1-9 $0.89
10-24 $0.80
25-99 $0.74
100-249 $0.63
250-499 $0.58
500-749 $0.48
750-999 $0.38
1000+ $0.34


  • 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

Texas Instruments  LM3697YFQR

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.