current-regulatedchargepumpidealpoweringbrightnessLEDs

产品概述 返回TOP
The CXLE87122 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 CXLE87122 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 CXLE87122 also features a very low shutdowncurrent, 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) allowsthe use of small 0603 current sensing resistors.
The CXLE87122 is available in Green TDFN-3×3-10L package and is specified over an ambient temperature range of -40℃ to +85℃.
产品特点 返回TOP
• Output Current Up to 700mA
• Up to 90% Efficiency in Torch Mode
• Adjustable Flash Mode Current
• 1× and 2× Automatic Modes for High Efficiency
• 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
< 1μa in shutdown
• 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 TDFN-3×3-10L Package
应用范围 返回TOP
White LED Torch, Flash for Cell
Phones, DSCs and Camcorders
White LED Backlighting
Generic Lighting, Flash and Strobe Applications
General Purpose High Current Boost