The SGM3785 is the ideal power solution for highpower
flash LEDs used with cell phone camera
modules or digital still cameras. It is a highly integrated
step-up DC/DC converter with very high switching
frequency, fixed at 2MHz, providing a very small total
solution for portable photo flash. The SGM3785 has
separate Flash mode and Movie/Torch mode enable
pins for maximum flexibility. Flash mode is usually used
with 660ms timer control to generate a high intensity
flash. The Flash mode and Movie/Torch mode maxim
LED current is programmed by external resistors
respectively, making the flash LED solution simple to
control. The real LED current at Flash mode and
Movie/Torch mode can be programmed by external
PWM signal at ENM pin.
The two LED output sinks can be shorted together
externally for higher power single flash LEDs, up to
1.5A continuous LED current. Thermal regulation is
integrated in Flash mode to limit the IC’s temperature
and continuously provide the maximum allowed output
current.
Various protection features are built into the SGM3785,
including cycle-by-cycle input current limit protection,
output over-voltage protection, LED fault (open or short)
protection and thermal shutdown protection. The
leakage current in shutdown is 0.1μA (TYP). SGM3785YTDP14G/TR资料下载
