5-Channel DC-DC Converter
LD7241
11/24/2008
5-Channel DC-DC Converter with 1 Channel Shutter Driver
REV :00
General Description
The LD7241 includ...
Description
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...
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