The LM3550 device is a low-noise, switched-capacitor DC-DC converter designed to operate as a current-limited and adjustable (up to 5.3 V) super-capacitor charger. The LM3550 features user-selectable termination voltages and provides one adjustable constant current output (up to 200 mA) and one NFET controller ideal for driving one or more high-current LEDs in a high-power flash mode or a low-power torch mode.

The LED current and flash pulse duration of the LM3550 can be programmed via an I²C-compatible interface. The STROBE pin allows the flash to be toggled via a flash-enable signal from a controller or camera module. The EOC pin sinks current when the output voltage reaches 95% of the final value.

The ALD/TEMP input pin allows either a light sensor to adjust the flash-current level based on the ambient light conditions, or it allows for over-temperature detection and protection of the LED during high-power operation or high ambient-temperature conditions.

For all available packages, see the orderable addendum at the end of the data sheet.

• Up to 5 A Flash Current
• 4 Selectable Super-Capacitor Charge Voltage Levels (4.5 V, 5 V, 5.3 V, Optimized)
• Adjustable Torch Current (60 mA to 200 mA)
• Ambient Light or LED Thermal Sensing With Current Scaleback
• Dedicated Indicator LED Current Source
• No Inductor Required
• Programmable Flash Pulse Duration, and Torch and Flash Currents via I2C-Compatible Interface
• True Shutdown (LED Disconnect)
• Flash Timeout Protection
• Low Profile 20-Pin UQFN Package (3 mm × 2.5 mm × 0.8 mm)

• Input voltage (type)
• Linear
• Topology
• Charge pump
• Vin (Min) (V)
• 2.7
• Vin (Max) (V)
• 5.5
• Iout (Max) (A)
• 5
• Iq (Typ) (mA)
• 0.168
• Features
• OVP
• Operating temperature range (C)
• -30 to 85
• Dimming method
• Analog, PWM

LM3550的完整型号有：LM3550SP/NOPB、LM3550SPX/NOPB，以下是这些产品的关键参数及官网采购报价：

LM3550SP/NOPB，工作温度：-30 to 85，封装：UQFN (NHU)-20，包装数量MPQ：1000个，MSL 等级/回流焊峰值温度：Level-3-260C-168 HR，引脚镀层/焊球材料：SN，TI官网LM3550SP/NOPB的批量USD价格：.739（1000+）

LM3550SPX/NOPB，工作温度：-30 to 85，封装：UQFN (NHU)-20，包装数量MPQ：4500个，MSL 等级/回流焊峰值温度：Level-3-260C-168 HR，引脚镀层/焊球材料：SN，TI官网LM3550SPX/NOPB的批量USD价格：.616（1000+）

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