The SGM3781 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 SGM3781 has separate Flash mode and Movie/Torch mode enable pins for maximum flexibility. 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 SGM3781, 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.
The SGM3781 is available in Green TDFN-3×2-14L package. It operates over an ambient temperature range of -40℃ to +85℃.
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
Flash Mode or Movie/Torch Mode Dimming via PWM Control
10kHz to 200kHz PWM Dimming Frequency
One Resistor Sets Flash Mode LED Current
One Resistor Sets Movie/Torch Mode LED Current
Integrated Thermal Regulation 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℃
|Part Number||Status||Package||Pins||Pb-Free||Temp Range|
|SGM3781YTDP14G/TR||Production||TDFN-3×2-14L||14||Y||-40℃ to +85℃||Samples|