AP3005

Data Sheet 2A 420kHz PWM BUCK DC-DC CONVERTER AP3005 General Description The AP3005 is a 420kHz fixed frequency PWM buck (step-down) DC-DC converter, capable of driving a 2A load with high efficiency, low ripple and excellent line and load regulation. The device includes a voltage reference, an oscillation circuit, an error amplifier, an internal PMOS and etc. The PWM control circuit is able to adjust the duty ratio linearly from 0 to 100%. The enable function, over current protection function, short circuit protection function and soft-start function are built inside. When OCP or SCP happens, the operation frequency will be reduced from 420kHz to 40kHz. An internal compensation block is employed to minimize external components. The AP3005 serves as an ideal power supply unit for portable devices, especially for chip set power in portable systems. It’s widely used for PDVD, LCD monitor and DPF chip set powers. Features 2A Constant Output Current 130mΩ RDSON Internal Power MOSFET Switch Up to 94% Efficiency Fixed 420kHz Frequency Wide 4.75V to 25V Input Voltage Range Output Voltage Adjustable from 0.8V to 21V Built in Thermal Shutdown Function Built-in Current Limit Function Built-in Soft-Start Function Support Ceramic or Electrolytic Capacitors Applications Portable DVD LCD Monitor/LCD TV Digital Photo Frame ADSL Set-up Box The AP3005 is available in SOIC-8 package. Mar. 2011 Rev. 1. 4 SOIC-8 Figure 1. Package Type of AP3005 BCD Semiconduc...