SGM3785S数据手册SGMICRO中文资料规格书

描述 Description

The SGM3785S is a highly integrated Boost DC/DC converter with 2MHz fixed frequency. High switching frequency makes it easy to use small components and optimized for portable photoflash. The SGM3785S is ideal for high power flash LEDs which are suitable for mobile phone camera modules and digital still cameras.
The SGM3785S offers excellent flexibility to enter flash mode and movie/torch mode through the ENF and ENM pins respectively. Flash mode is usually used with 670ms 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 to prevent the device from triggering thermal shutdown by reducing the LED sink current below the programmed value.
The SGM3785S 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 SGM3785S 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 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

• 670ms Flash Timer Control

• 360kΩ Pull-Down Resistor on ENM and ENF Pins

• Protection Features
Output Over-Voltage Protection
LED Open or Short Protection
Cycle-by-Cycle Current Limit

• Less than 1μA Shutdown Current

• Available in a Green TDFN-3×2-14L Package

• Temperature Range: -40℃ to +85℃

应用 Application

Portable Equipment