Phone:
021-64472383
BCT3142
1100mA Buck/Boost Charge Pump LED Driver
BCT3142
1100mA Buck/Boost Charge Pump LED Driver
GENERAL DESCRIPTION
The BCT3142 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 BCT3142 incorporates a 1-wire interface to program the flash LED current at 8 levels and flash timeout at 2 leve.
The BCT3142 supports PWM dimming to adjust the LED brightness during torch application by simply providing a PWM signal to flash pin.
The BCT3142 automatically switches modes between step-up 2x and step-down 1x ensuring that LED current does not depend on the forward voltage. It switches at 1.9MHz, 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 BCT3142 also features a very low shutdown current, an automatic soft-start mode to limit inrush current, as well as voltage and over thermal shutdown control.
A low current sense reference voltage (47mV) allows the use of small 0603 current sensing resistors.
The BCT3142 is available in Green DFN3x3-10L package and is specified over an ambient temperature range of -40°C to +85°C.
APPLICATIONS
White LED Torch, Flash for Cell
Phones,PADs, DSCs and Camcorders
White LED Backlighting
Generic Lighting, Flash and Strobe Applications General Purpose High Current Boost
FEATURES
Output Current up to 1.1A
8 FLASH LED Current Levels Selectable by 1-wire Interface: 100%*IFLASH,90%*IFLASH……30%*IFLASH
2 Flash Timeout Levels Selectable by 1-wire Interface: 220ms,1.3s
PWM Dimming Control in Torch Mode
Ultra low RDSON:0.4Ω（1x Mode），2Ω（2x Mode）
Up to 92% 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: 1.9MHz
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
ORDERING INFORMATION
Order Number | Package Type | Temperature Range | Marking | QTY/Reel |
BCT3142EGB-TR | DFN3x3-10L | -40°C to +85°C | DQKP XXXXX | 6000 |
Note: "XXXXX" in Marking will be appeared as the batch code.
