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LM3533

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Complete lighting solution for smartphone handsets

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Data sheet

LM3533

ACTIVE
Data sheet Order now

Product details

Number of channels 7 Vin (min) (V) 2.7 Vin (max) (V) 5.5 Vout (min) (V) 2.7 Vout (max) (V) 40 Type Inductive Switching frequency (max) (kHz) 1000 Duty cycle (max) (%) 94 LED current per channel (mA) 30 Peak efficiency (%) 88 Topology Boost Features OVP Operating temperature range (°C) -40 to 125 Rating Catalog
Number of channels 7 Vin (min) (V) 2.7 Vin (max) (V) 5.5 Vout (min) (V) 2.7 Vout (max) (V) 40 Type Inductive Switching frequency (max) (kHz) 1000 Duty cycle (max) (%) 94 LED current per channel (mA) 30 Peak efficiency (%) 88 Topology Boost Features OVP Operating temperature range (°C) -40 to 125 Rating Catalog
DSBGA (YFQ) 20 3.96 mm² 2.2 x 1.8
  • Drives Two 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)
  • 14-Bit Equivalent Exponential Dimming With 8-Bit
    Programmable Backlight Code
  • Selectable Analog ALS Input with 128
    Programmable Gain-Setting Resistors or PWM
    ALS Input With Internal Low-Pass Filter
  • PWM Input for Content Adjustable Brightness
    Control
  • Five Low-Voltage Current Sinks for Indicator LEDs
  • Integrated Charge Pump for Improved Efficiency
    and VIN Operating Range
  • Internal Pattern Generation Engine
  • 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
  • 27-mm2 Total Solution Size
  • Drives Two 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)
  • 14-Bit Equivalent Exponential Dimming With 8-Bit
    Programmable Backlight Code
  • Selectable Analog ALS Input with 128
    Programmable Gain-Setting Resistors or PWM
    ALS Input With Internal Low-Pass Filter
  • PWM Input for Content Adjustable Brightness
    Control
  • Five Low-Voltage Current Sinks for Indicator LEDs
  • Integrated Charge Pump for Improved Efficiency
    and VIN Operating Range
  • Internal Pattern Generation Engine
  • 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
  • 27-mm2 Total Solution Size

The LM3533 is a complete power source for backlight, keypad, and indicator LEDs in smartphone handsets. The high-voltage inductive boost converter provides the power for two series LED strings for display backlight and keypad functions (HVLED1 and HVLED2). The integrated charge pump provides the bias for the five low-voltage indicator LED current sinks (LVLED1 to LVLED5). All low-voltage current sinks can have a programmable pattern modulated onto their output current for a wide variety of blinking patterns.

Additional features include a pulse width modulation (PWM) control input for content adjustable backlight control (CABC), and an ambient light sensor interface (ALS) with an internal 8-bit ADC to provide automatic current adjustment based upon ambient light conditions. Both the PWM and ALS inputs can be used to control any high- or low-voltage current sink.

The LM3533 is fully programmable via an I2C-compatible interface. The device is available in a 20-pin DSBGA and operates over a 2.7-V to 5.5-V input voltage range and a −40°C to +85°C temperature range.

The LM3533 is a complete power source for backlight, keypad, and indicator LEDs in smartphone handsets. The high-voltage inductive boost converter provides the power for two series LED strings for display backlight and keypad functions (HVLED1 and HVLED2). The integrated charge pump provides the bias for the five low-voltage indicator LED current sinks (LVLED1 to LVLED5). All low-voltage current sinks can have a programmable pattern modulated onto their output current for a wide variety of blinking patterns.

Additional features include a pulse width modulation (PWM) control input for content adjustable backlight control (CABC), and an ambient light sensor interface (ALS) with an internal 8-bit ADC to provide automatic current adjustment based upon ambient light conditions. Both the PWM and ALS inputs can be used to control any high- or low-voltage current sink.

The LM3533 is fully programmable via an I2C-compatible interface. The device is available in a 20-pin DSBGA and operates over a 2.7-V to 5.5-V input voltage range and a −40°C to +85°C temperature range.
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Technical documentation

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Type Title Date
* Data sheet LM3533 Complete Lighting Power Solution for Smartphone Handsets datasheet (Rev. C) PDF | HTML 27 Sep 2015
White paper Understanding Functional Safety FIT Base Failure Rate Estimates per IEC 62380 and SN 29500 (Rev. A) PDF | HTML 30 Apr 2024
White paper Common LED Functions and LED Driver Design Considerations 21 Sep 2020
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Application note Analog PWM Dimming in White-LED Drivers 21 Dec 2016
Application note Inductor Selection in Boost Converters for LCD Backlight Applications 24 Oct 2016
Application note Schottky Diode Selection in Asynchronous Boost Converters 06 Sep 2016
User guide AN-2250 LM3533 Evaluation Kit (Rev. B) 30 Apr 2013
User guide AN-2250 LM3533 Evaluation Kit 21 Jun 2012

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