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