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.

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