General Description

The APW7077/A series are multi-function PWM step-upDC-DCconverterwithanadaptivevoltagemode controller and higher efficiency application from one to four cells battery packs. The APW7077/A series are set PWM operating mode, voltage-mode to follow portable application. And built-in driver pin, EXT pin, for connecting to an external transistor or MOSFET during light load, the device will automatically skip switching cycles to maintain high efficiency. The APW7077/A series consists of PWM controller, reference voltage, phase compensation, oscillator, soft-start, driver block. It will provide to operate suitable voltage without external compensation circuit. The APW7077/A series have fixed voltage and adjustable voltage version from a wide input voltage ranges 0.7V to 5.5V for step-up DC-DC converter. The start-up is guaranteed at 1V and the device is operating down to 0.7V. And providing up to 300mA loading current. Besides, low quiescent current (switch-off) is guaranteed.

特性 Features

● Low Start-up Voltage 0.9V

● Fixed 300kHZ Operating Frequency

● Built-In Internal Soft Start Circuit

● Low Operating Current

● 3.3V and 5V (±2.5) Fixed (APW7077) or Adjustable Output Voltage (APW7077A)

● High Efficiency Up to 88 at 400mA Output Current

● High Output Current Up to 1A

● Compact Package: SOT-23-5

● Lead FreeAvailable (RoHS Compliant)

Applications

● Cellular and Portable Phones

● PortableAudio

● Camcorders andDigital Still Camera

● Hand-held Instrument

● PDAs