AP1623

PWM Control Step-Down Switching Regulator-Converter AP1623 „ Features - Low current consumption: In operation: 60µA max. Power off: 0.5µA max. - Input voltage: 2.5V to 16V. - Output voltage: 1.8V & Adjustable to 6V. - Duty ratio: 0% to 100% PWM control - Oscillation frequency: 180KHz typ. - Soft-start function: 8ms typ. - With a power-off function. - Built-in internal SW P-channel MOS - SOP-8L Package. „ Applications - On-board power supplies of battery devices for portable telephones, electronic notebooks, PDA, and other hand-held sets. - Power supplies for audio equipment, including portable CD players and headphone stereo equipment. - Fixed voltage power supply for cameras, video equipment and communications equipment. - Power supplies for microcomputers. - Conversion from four Ni-H or Ni-Cd cells or two lithium-ion cells to 3.3V/3V. - Conversion of AC adapter input to 5V/3V. „ General Description AP1623 consists of CMOS step-down switching regulator-controllers with PWM control. These devices include a reference voltage source, oscillation circuit, error amplifier, internal PMOS and etc. AP1623 provides low-ripple power, high efficiency, and excellent transient characteristics. The PWM control circuit is able to very the duty ratio linearly from 0 up to 100. This converter also contains an error amplifier circuit as well as a soft-start circuit that prevent s overshoot at startup. With the addition of an internal P-channel Power MOS, a coil, capacitors, and a diode con...