LM3535 Series

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

Catalog

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

Part	Current - Output / Channel [custom]	Operating Temperature [Min]	Operating Temperature [Max]	Type	Topology	Voltage - Supply (Max)	Supplier Device Package	Voltage - Output [Max]	Voltage - Output [Min]	Package / Case	Frequency	Applications	Dimming	Number of Outputs	Mounting Type
Texas Instruments LM3535TMX/NOPB	25 mA	-30 °C	85 °C	DC DC Regulator	Switched Capacitor (Charge Pump)	5.5 V	20-DSBGA	4 V	2 V	20-WFBGA DSBGA	1.33 MHz	Backlight	PWM	8	Surface Mount
Texas Instruments LM3535TME/NOPB	25 mA	-30 °C	85 °C	DC DC Regulator	Switched Capacitor (Charge Pump)	5.5 V	20-DSBGA	4 V	2 V	20-WFBGA DSBGA	1.33 MHz	Backlight	PWM	8	Surface Mount
Texas Instruments LM3535TMX-2ALS/NOPB	25 mA	-30 °C	85 °C	DC DC Regulator	Switched Capacitor (Charge Pump)	5.5 V	20-DSBGA	4 V	2 V	20-WFBGA DSBGA	1.33 MHz	Backlight	PWM	8	Surface Mount

Catalog

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

Key Features

• Drives Up to 8 LEDs Each With Up to 25 mA of Diode CurrentExternal PWM Input for Dynamic Backlight ControlMulti-Zone Ambient Light Sensing (ALS)ALS Interrupt ReportingIndependent On/Off Control for All Current Sinks128 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 FunctionUp to 90% Efficiency0.55% Accurate Current MatchingWide Input Voltage Range (2.7 V to 5.5 V)Active High Hardware EnableTotal Solution Size < 16 mm2Low Profile 20-Pin DSBGA PackageDrives Up to 8 LEDs Each With Up to 25 mA of Diode CurrentExternal PWM Input for Dynamic Backlight ControlMulti-Zone Ambient Light Sensing (ALS)ALS Interrupt ReportingIndependent On/Off Control for All Current Sinks128 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 FunctionUp to 90% Efficiency0.55% Accurate Current MatchingWide Input Voltage Range (2.7 V to 5.5 V)Active High Hardware EnableTotal Solution Size < 16 mm2Low Profile 20-Pin DSBGA Package

Description

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.