GENERAL 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℃.

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℃

APPLICATIONS

Portable Equipment