BCT3140
The BCT3140 is a current-regulated charge pump ideal for 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 BCT3140 automatically switches modes between step-up and step-down ensuring that LED current does not depend on the forward voltage. It switches at 1.5MHz, 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 BCT3140 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 thermal shutdown control. A low current sense reference voltage (47mV) allows the use of small 0603 current sensing resistors.
The BCT3140 is available in Green DFN3x3-10L package and is specified over an ambient temperature range of -40°C to +85°C.
FEATURES
Output Current up to 1000mA
Up to 90% Efficiency in Torch Mode
Adjustable FLASH Mode Current
1x and 2x Automatic Modes for High Efficiency
Input Voltage Range: 2.7V to 5.5V
Minimum External Components: No Inductors
High Frequency Operation: 1.5MHz
Low 47mV Reference For Low Loss Sensing
Built-In 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 DFN3x3-10L Package
APPLICATIONS
White LED Torch, Flash for Cell
Phones, DSCs and Camcorders
White LED Backlighting
Generic Lighting, Flash and Strobe Applications
General Purpose High Current Boost
