LM3550数据手册集成电路（IC）的LED驱动器规格书PDF

描述 Description

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.

特性 Features

• 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)