●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.
● 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
