SGM3785数据手册SGMICRO中文资料规格书

描述 Description

The SGM3785 is a highly integrated boost DC/DC converter with 2MHz fixed frequency. High switching frequency makes it easy to use tiny components and optimized for portable photo flash. The SGM3785 is ideal for high power flash LEDs which are suited for mobile phone camera modules and digital still cameras.

The SGM3785 offers excellent flexibility to enter flash mode and movie/torch mode through the ENF and ENM pins respectively. Flash mode is usually used with 660ms timer control to generate a high intensity flash. The maximal flash current and movie/torch current are respectively programmed through external resistors (RSETF and RSETM), which can provide simple control for the flash LED solution. The real LED current in flash mode and movie/torch mode can be programmed by external PWM signal on ENM pin.

The D1 and D2 pins can be tied together to drive higher power single flash LEDs, sinking up to 1.5A continuous current. The integrated thermal regulation in flash mode limits the temperature of the device. It can prevent the device from triggering thermal shutdown and provide the maximum LED output current continuously.

The SGM3785 provides very low shutdown current. It also includes a comprehensive set of protection features such as over-voltage protection, LED open or short protection and thermal shutdown.

The SGM3785 is available in a Green TDFN-3×2-14L package. It operates over an ambient temperature range of -40℃ to +85℃.

特性 Features

• Input Voltage Range: 3V to 5V
• Up to Total 1.5A or Each 0.75A LED Current
• Up to 90% Efficiency
• Dual Flash LED Outputs
• Tiny Inductor: 1.0μH
• 2MHz Boost Converter
• Separate Flash Mode Enable and Movie/Torch Mode Enable Control Pins
• Flash Current and Movie/Torch Current can be Programmed through PWM Signal on ENM Pin
• Independent Resistors Set Flash Current and Movie/Torch Current Respectively
• Integrated Thermal Regulation Control
• 660ms Flash Timer Control
• 330kΩ Pull-Down Resistor on ENM and ENF Pins
• Protection Features
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• Output Over-Voltage Protection
• LED Open or Short Protection
• Cycle-by-Cycle Current Limit

应用 Application

Portable Equipment