The LM3538 is a highly integrated LED driver capable of driving 6 LEDs in parallel for single display backlighting applications. Independent LED control allows for a subset of the main display LEDs to be selected for partial illumination applications.

I²C-compatible control allows full configurability of the backlighting function. The LM3538 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 a means to adjust the backlight intensity dynamically based upon the content of the display.

Four integrated LDOs are fully configurable through I²C capable of addressing point-of-load regulation needs for functions such as integrated camera modules. The LDOs can be powered from main battery source, or by a fixed output voltage of an external buck converter (post regulation) leading to higher conversion efficiency.

The LM3538 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

LM3538 is offered in a tiny 30-bump DSBGA package.

Lighting:

• 6-channel Backlight Capability
• Internal ALS Engine; PWM Input to Support CABC
• Built-in Power Supply and Gain Control for Ambient Light Sensor
• Up to 90% Efficiency
• Adaptive Charge Pump with 1x and 1.5x Gains for Maximum Efficiency
• 128 Dimming Steps for Group A, Exponential or Linear Dimming Selectable by Register Setup
• 8 Linear Dimming States for Group B

LDOs:

• 4 Programmable LDOs (300mA/150mA Output Currents)
• Default Startup Voltage States
• Low Dropout Voltage: 100mV typ. at 150mA Load Current
• LDO Input Voltage = 1.8V to VIN_A
• Overload Protection

Combined Common Features:

• Wide Input Voltage Range: 2.7V to 5.5V
• I2C-compatible Serial Interface
• 2 General-purpose Outputs

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• Number of channels (#)
• 6
• 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)
• 1.3
• LED current per channel (mA)
• 25
• Peak efficiency (%)
• 90
• Topology
• Multi-Channel
• Features
• Enable/Shutdown, I2C Control, PWM Control
• Operating temperature range (C)
• -30 to 110

LM3538的完整型号有：LM3538TME/NOPB、LM3538TMX/NOPB，以下是这些产品的关键参数及官网采购报价：

LM3538TME/NOPB，工作温度：-30 to 110，封装：DSBGA (YFQ)-30，包装数量MPQ：250个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SNAGCU，TI官网LM3538TME/NOPB的批量USD价格：.887（1000+）

LM3538TMX/NOPB，工作温度：-30 to 110，封装：DSBGA (YFQ)-30，包装数量MPQ：3000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SNAGCU，TI官网LM3538TMX/NOPB的批量USD价格：.739（1000+）

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