The SGM3140B is a current-regulated charge pump idealfor powering high brightness LEDs for camera flash applications. The charge pump can be set to regulate two current levels for Flash and Torch modes.
The SGM3140B automatically switches modes between step-up and step-down ensuring that LED current does not depend on the forward voltage. It switches at 2.2MHz, allowing the use of tiny components. The supply voltage ranges from 2.7V to 5.5V and is ideally suited for all applications powered by a single Li-ion battery cell or three to four NiCd, NiMH, or Alkaline battery cells.
The SGM3140B also features a very low shutdown current, an automatic soft-start mode to limit inrush current, as well as over-current, over-voltage and over-temperature thermal shutdown control.
A low current-sense reference voltage (47mV) allows the use of small 0603 current sensing resistors.
The SGM3140B is available in Green TDFN-3×3-10L package and is specified over an ambient temperature range of -40℃ to +85℃.
Output Current Up to 500mA
Up to 90% Efficiency in Torch Mode
Adjustable Flash Mode Current
Automatic Buck/Boost Mode Switchover
Input Voltage Range: 2.7V to 5.5V
Minimum External Components: No Inductors
High Frequency Operation: 2.2MHz
Low 47mV Reference for Low Loss Sensing
IQ < 1μA in Shutdown
Automatic Soft-Start Limits Inrush Current
Low Input and Output Ripple and Low EMI
Output Over-Voltage Protection
Over-Current and Over-Temperature Protection
Available in Green TDFN-3×3-10L Package
White LED Torch, Flash for Cell
Phones, DSCs and Camcorders
White LED Backlighting
Generic Lighting, Flash and Strobe Applications
General Purpose High Current Boost
|-40℃ to +85℃