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LM3535

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Multi-display LED driver with Ambient Light Sensing and Dynamic backlight control Compatibility

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Data sheet

LM3535

ACTIVE
Data sheet Order now

Product details

Number of channels 8 Vin (min) (V) 2.7 Vin (max) (V) 5.5 Vout (min) (V) 2.7 Vout (max) (V) 5 Type Capacitive Switching frequency (max) (kHz) 1330 Duty cycle (max) (%) 100 LED current per channel (mA) 25 Peak efficiency (%) 90 Topology Boost, Multi-Channel Features OVP Operating temperature range (°C) -30 to 85 Rating Catalog
Number of channels 8 Vin (min) (V) 2.7 Vin (max) (V) 5.5 Vout (min) (V) 2.7 Vout (max) (V) 5 Type Capacitive Switching frequency (max) (kHz) 1330 Duty cycle (max) (%) 100 LED current per channel (mA) 25 Peak efficiency (%) 90 Topology Boost, Multi-Channel Features OVP Operating temperature range (°C) -30 to 85 Rating Catalog
DSBGA (YFQ) 20 3.96 mm² 2.2 x 1.8
  • Drives Up to 8 LEDs Each With Up to 25 mA of Diode Current
  • External PWM Input for Dynamic Backlight Control
  • Multi-Zone Ambient Light Sensing (ALS)
  • ALS Interrupt Reporting
  • Independent On/Off Control for All Current Sinks
  • 128 Exponential Dimming Steps With 600:1 Dimming Ratio for Group A (Up to 6 LEDs)
  • 8 Linear Dimming States for Groups B (Up to 3 LEDs) and D1C (1 LED)
  • Programmable Auto-Dimming Function
  • Up to 90% Efficiency
  • 0.55% Accurate Current Matching
  • Wide Input Voltage Range (2.7 V to 5.5 V)
  • Active High Hardware Enable
  • Total Solution Size < 16 mm2
  • Low Profile 20-Pin DSBGA Package
  • Drives Up to 8 LEDs Each With Up to 25 mA of Diode Current
  • External PWM Input for Dynamic Backlight Control
  • Multi-Zone Ambient Light Sensing (ALS)
  • ALS Interrupt Reporting
  • Independent On/Off Control for All Current Sinks
  • 128 Exponential Dimming Steps With 600:1 Dimming Ratio for Group A (Up to 6 LEDs)
  • 8 Linear Dimming States for Groups B (Up to 3 LEDs) and D1C (1 LED)
  • Programmable Auto-Dimming Function
  • Up to 90% Efficiency
  • 0.55% Accurate Current Matching
  • Wide Input Voltage Range (2.7 V to 5.5 V)
  • Active High Hardware Enable
  • Total Solution Size < 16 mm2
  • Low Profile 20-Pin DSBGA Package

The LM3535 device is a highly integrated LED driver capable of driving 8 LEDs in parallel for large display applications. Independent LED control allows selection of a subset of the 6 main display LEDs for partial-illumination applications. In addition to the main bank of 6, the LM3535 is capable of driving an additional 2 independently controlled LEDs to support Indicator applications.

The LED driver current sinks are split into three independently controlled groups. The primary group can be configured to drive up to six LEDs for use in the main phone display. Groups B and C are provided for driving secondary displays, keypads and indicator LEDs. All of the LED current sources can be independently turned on and off providing flexibility to address different application requirements.

The LM3535 provides multi-zone ambient light sensing allowing autonomous backlight intensity control in the event of changing ambient light conditions. A PWM input is also provided to give the user the means to adjust the backlight intensity dynamically based upon the content of the display.

The LM3535 provides excellent efficiency without the use of an inductor by operating the charge pump in a gain of 3/2 or in pass mode. The proper gain for maintaining current regulation is chosen, based on LED forward voltage, so that efficiency is maximized over the input voltage range.

The LM3535 is available in a tiny 20-pin, 0.4-mm pitch, thin DSBGA package.

The LM3535 device is a highly integrated LED driver capable of driving 8 LEDs in parallel for large display applications. Independent LED control allows selection of a subset of the 6 main display LEDs for partial-illumination applications. In addition to the main bank of 6, the LM3535 is capable of driving an additional 2 independently controlled LEDs to support Indicator applications.

The LED driver current sinks are split into three independently controlled groups. The primary group can be configured to drive up to six LEDs for use in the main phone display. Groups B and C are provided for driving secondary displays, keypads and indicator LEDs. All of the LED current sources can be independently turned on and off providing flexibility to address different application requirements.

The LM3535 provides multi-zone ambient light sensing allowing autonomous backlight intensity control in the event of changing ambient light conditions. A PWM input is also provided to give the user the means to adjust the backlight intensity dynamically based upon the content of the display.

The LM3535 provides excellent efficiency without the use of an inductor by operating the charge pump in a gain of 3/2 or in pass mode. The proper gain for maintaining current regulation is chosen, based on LED forward voltage, so that efficiency is maximized over the input voltage range.

The LM3535 is available in a tiny 20-pin, 0.4-mm pitch, thin DSBGA package.
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Type Title Date
* Data sheet LM3535 Multi-Display LED Driver With Ambient Light Sensing and Dynamic Backlight Control Compatibility datasheet (Rev. B) PDF | HTML 07 Mar 2018
White paper Common LED Functions and LED Driver Design Considerations 21 Sep 2020
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018

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