LD7241

LD7241 11/24/2008 5-Channel DC-DC Converter with 1 Channel Shutter Driver REV :00 General Description The LD7241 includes 5-channel PWM DC/DC controller IC and a Shutter controller. It can operate at 1MHz frequency and built in ON/OFF control, soft-start, power on/off sequence and output overload protection. Four channels have been integrated with MOSFETs and can achieve higher efficiency up to 90%~95% (CH1, CH2, CH3 and CH4). CH5 is a current source, ideally for 1WLED driver application. The LD7241 is also built with constant-current shutter driver. It optimizes overall efficiency and cost, and also reduces the board size. The LD7241 is available in a space-saving 5mm*5mm 40-pin QFN package. + Patented Features 1.5V to 5V Battery Input Range All Power Switches Integrated All channels built with internal compensation Synchronous step-down Converter - Efficiency up to 95% - Duty Cycle up to 100% Synchronous Step-up Converter - Efficiency up to 95% - Output Overvoltage Protection - Truly disconnected from output during shutdown 1 WLED Driver application -1KHz~50KHz PWM dimming CH2 Buck or Boost Configuration Selection Built-in Charge pump to enhance CH3/CH4 PMOS gate driving capacity Built-in Constant Current Shutter Driver Fixed 1MHz Operating Frequency Shutdown current :2.5μA (typ) Applications Digital Video Camera, Digital Still Camera 1 Leadtrend Technology Corporation www.leadtrend.com.tw LD7241-DS-00 November 2008 Typical Application LD7241 L...