Document
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
SGM3780
2MHz, 1.5A Flash LED Driver in TDFN-3×2-14L Package
PACKAGE/ORDERING INFORMATION
MODEL SGM3780
ORDER NUMBER SGM3780YTDP14G/TR
PACKAGE DESCRIPTION
TDFN-3×2-14L
SPECIFIED TEMPERATURE
RANGE
-40℃ to +85℃
MARKING INFORMATION
3780DP XXXXX
PACKAGE OPTION
Tape and Reel, 3000
NOTE: XXXXX = Date Code and Vendor Code.
ABSOLUTE MAXIMUM RATINGS
VIN, VOUT, D1 and D2 Voltages............................. -0.3V to 6V ENF, ENM, RSETF, RSETM ........................-0.3V to VIN + 0.3V SW Voltage............................................................ -0.3V to 6.5V Storage Temperature Range..............................-65℃ to +150℃ Junction Temperature........................................................150℃ Operating Temperature Range............................-40℃ to +85℃ Lead Temperature (Soldering 10 sec) ..........................................................................................260℃ ESD Susceptibility HBM..................................................................................2000V MM......................................................................................200V
NOTE: Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
CAUTION
This integrated circuit can be damaged by ESD if you don’t pay attention to ESD protection. SGMICRO recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
SGMICRO reserves the right to make any change in circuit design, specification or other related things if necessary without notice at any time. Please contact SGMICRO sales office to get the latest datasheet.
SG Micro Corp www.sg-micro.com
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SGM3780 PIN CONFIGURATION (TOP VIEW)
2MHz, 1.5A Flash LED Driver in TDFN-3×2-14L Package
RSETM 1 RSETF 2 AGND 3
VIN 4 SW 5 SW 6 PGND 7
AGND
14 D2 13 AGND 12 D1 11 ENM 10 ENF 9 VOUT 8 VOUT
TDFN-3×2-14L
PIN DESCRIPTION
PIN
1 2 3, 13 4 5, 6 7 8, 9 10 11
12
14
Exposed Pad
NAME
FUNCTION
RSETM RSETF AGND
VIN SW PGND VOUT ENF ENM
D1
D2
AGND
Movie/Torch Mode Current Setting Pin. Flash Mode Current Setting Pin. Analog.