APW7077 Datasheet, PDF (1/21 Pages) Anpec Electronics Coropration – PWM Step-Up DC-DC Converter

APW7077/A
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 Free Available (RoHS Compliant)
Applications
• Cellular and Portable Phones
• Portable Audio
• Camcorders and Digital Still Camera
• Hand-held Instrument
• PDAs
PWM Step-Up DC-DC Converter
General Description
The APW7077/A series are multi- function PWM
step-up DC-DC converter with an adaptive voltage mode
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.
Pinouts
EXT GND
5
4
123
CE VOUT NC
SOT-23-5 (Top View)
APW7077
EXT GND
5
4
123
FB VDD CE
SOT-23-5 (Top View)
APW7077A
ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and advise
customers to obtain the latest version of relevant information to verify before placing orders.
Copyright © ANPEC Electronics Corp.
1
Rev. A.4 - Sep, 2005
www.anpec.com.tw