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Complete Lighting Power Solution for Smartphone Handsets


Package | PIN: YFQ | 20
Temp: I (-40 to 85)
Carrier: Cut Tape
Qty Price
1-9 $1.66
10-24 $1.49
25-99 $1.38
100-249 $1.20
250-499 $1.11
500-749 $0.93
750-999 $0.76
1000+ $0.70


  • 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
    (Both Backlight and Indicator)
  • 11-Bit High-Voltage LED Dimming
  • PWM Input for Content Adjustable Brightness
    Control (CABC)
  • Integrated 1-A/40-V MOSFET
  • Adaptive Boost Output to LED Voltages
  • Six Low-Voltage Current Sinks for Indicator LEDs
  • Integrated Charge Pump for Improved Efficiency
    and VIN Operating Range
  • Internal Pattern Generation Engine for Each
    Indicator LED
  • Fully Configurable LED Grouping and Control
  • Four Programmable Overvoltage Protection
    Thresholds (16 V, 24 V, 32 V, and 40 V)
  • Programmable 500-kHz and 1-MHz
    Switching Frequency
  • Overcurrent Protection
  • Thermal Shutdown Protection
  • 27 mm2 Total Solution Size

Texas Instruments  LM3633YFQR

The LM3633 11-bit LED driver provides high-performance backlight dimming for 1, 2, or 3 parallel high-voltage 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 LM3633 is a complete power source for backlight, keypad, and indicator LEDs in smartphone handsets. The high-voltage inductive boost converter provides the power for three parallel LED strings (HVLED1, HVLED2 and HVLED3). The integrated charge pump provides the bias for the six low-voltage indicator LEDs (LVLED1-LVLED6). All low-voltage current sinks can have a programmable pattern modulated onto their output current for a wide variety of blinking patterns.

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 LM3633 is fully programmable 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 datasheet.