SGM3780
2MHz, 1.5A Flash LED Driver
in TDFN-3×2-14L Package
GENERAL DESCRIPTION
The SGM3780 is the ideal power solution for
high-power 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 SGM3780 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 LED
current is programmed by external resistors
respectively, making the flash LED solution simple to
control. If both enable pins are at logic high, the LED
current will be programmed by the Movie/Torch mode
setting resistor.
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 SGM3780,
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 less than 1μA.
FEATURES
● Input Voltage Range: 3V to 5V
● Dual Flash LED Outputs
● Drive Up to Total 1.5A or 0.75A per Channel
● High Efficiency LED Driver (Up to 90%)
● 2MHz Step-Up Converter
● Very Small Inductor: 1.0μH
● Independent Flash Mode Enable and Movie/Torch
Mode Enable Pins
● Movie/Torch Mode Dimming via PWM Control
● One Resistor Sets Flash Mode LED Current
● One Resistor Sets Movie/Torch Mode LED Current
● Integrated Thermal Regulation Control
● 660ms Flash Timer Control
● 330kΩ Pull-Down Resistor on ENM or ENF Pin
● LED Open or Short Protection
● Output Over-Voltage Protection
● Cycle-by-Cycle Inductor Current Limit
● Less than 1μA Shutdown Current
● Available in Green TDFN-3×2-14L Package
● Temperature Range: -40℃ to +85℃
APPLICATIONS
Portable Equipments
The SGM3780 is available in Green TDFN-3×2-14L
package. It operates over an ambient temperature
range of -40℃ to +85℃.
SG Micro Corp
www.sg-micro.com
REV. A
