LM3535 - 具有环境光传感和动态背光控制兼容性的多显示 LED 驱动器

LM3535是TI德州仪器公司的一款背光产品，LM3535是具有环境光传感和动态背光控制兼容性的多显示 LED 驱动器，本站介绍了LM3535的封装应用图解、特点和优点、功能等，并给出了与LM3535相关的TI元器件型号供参考。

LM3535 - 具有环境光传感和动态背光控制兼容性的多显示 LED 驱动器 - 背光 - LED驱动器 - 德州仪器

产品描述

The LM3535 is a highly integrated LED driver capable of driving 8 LEDs in parallel for large display applications. Independent LED control allows for a subset of the 6 main display LEDs to be selected 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 (1 or 2 ALS inputs depending on option) allowing autonomous backlight intensity control in the event of changing ambient light conditions. A PWM input is also provided to give the user a 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-bump, 0.4mm pitch, thin DSBGA package.

产品特性

Drives Up to 8 LEDs With Up to 25mA of Diode Current Each
External PWM Input For Dynamic Backlight Control
Multi-Zone Ambient Light Sensing (ALS)
Dual-ALS Sensor Inputs (LM3535-2ALS Only)
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
Internal Soft-Start Limits Inrush Current
True Shutdown Isolation for LEDs
Wide Input Voltage Range (2.7V to 5.5V)
Active High Hardware Enable
Total Solution Size < 16mm2
Low Profile 20 Bump DSBGA Package (1.650mm × 2.055mm × 0.6mm)

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