The LM3508 is a synchronous boost converter (no external Schottky diode required) that provides a constant current output. It is designed to drive up to 4 series white LEDs at 30mA from a single-cell Li-Ion battery. A single low power external resistor is used to set the maximum LED current. The LED current can be adjusted by applying a PWM signal of up to 100kHz to the DIM pin. Internal soft-start circuitry is designed to eliminate high in-rush current at start-up. For maximum safety, the device features an advanced short-circuit protection when the output is shorted to ground. Additionally, over-voltage protection and an 850kHz switching frequency allow for the use of small, low-cost output capacitors with lower voltage ratings. During shutdown, the output is disconnected from the input preventing a leakage current path through the LEDs to ground. The LM3508 is available in a tiny 9-bump chip-scale DSBGA package.

• Drives 4 Series White LEDs with up to 30mA
• >80% Peak Efficiency
• Up to 100kHz PWM Brightness Control
• Accurate ±5% LED Current Regulation across VIN range
• Internal Synchronous PFET (No Schottky Diode Required)
• True Shutdown Isolation
• Output Short-Circuit Protection
• 17.5V Over-Voltage Protection
• Internal Soft-Start Eliminates Inrush Current
• Wide Input Voltage Range: 2.7V to 5.5V
• 850kHz Fixed Frequency Operation
• Low Profile 9-Bump DSBGA Package (1.514mm x 1.514mm x 0.6mm)

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• Number of channels (#)
• 1
• Vin (Min) (V)
• 2.7
• Vin (Max) (V)
• 5.5
• Vout (Min) (V)
• 10
• Vout (Max) (V)
• 17.5
• Type
• Inductive
• Switching frequency (Max) (kHz)
• 850
• LED current per channel (mA)
• 30
• Peak efficiency (%)
• 85
• Topology
• Boost
• Features
• OVP
• Operating temperature range (C)
• -30 to 85

LM3508的完整型号有：LM3508TL/NOPB、LM3508TLX/NOPB，以下是这些产品的关键参数及官网采购报价：

LM3508TL/NOPB，工作温度：-30 to 85，封装：DSBGA (YZR)-9，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LM3508TL/NOPB的批量USD价格：.386（1000+）

LM3508TLX/NOPB，工作温度：-30 to 85，封装：DSBGA (YZR)-9，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LM3508TLX/NOPB的批量USD价格：.186（1000+）

LM3508TLEV — LM3508TL 评估板

The LM3508 is a synchronous boost converter (no external Schottky diode required) that provides a constant current output. It is designed to drive up to 4 series white LEDs at 30mA from a single-cell Li-Ion battery. A single low power external resistor is used to set the maximum LED current. The (...)

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