Copyright  ANPEC Electronics Corp.
Rev. A.5 - Aug., 2005
APW7075
www.anpec.com.tw1
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.
Step-Up Converter and LDO Combo
Features General Description
Applications
• Dual Mode Power System
• USB Peripheral
• Camcorders and Digital Camera
• Hand-held Instrument
• PDAs
The APW7075 is a PWM/PFM, high-efficiency and
step-up DC-DC converter with an integrated LDO input
switch for dual mode application. During battery mode
operation, the APW7075 acts as synchronous recti-
fier and step-up DC-DC converter with a fixed or ad-
justable output voltage. When the VIN pin sense 5V
input voltage, the APW7075 is switched to LDO op-
eration mode, maintaining the constant output voltage.
The input voltage ranges from 0.6 V to 4.5V for step-
up DC-DC converter. The start-up is guaranteed at1V
and the device is operating down to 0.6V. When the
device is at LDO operating mode, the suitable output
voltage 3.3V and loading current 500mA for maximum
power consumption are guaranteed.
The APW7075 is suited for dual mode and portable
battery powered appliance with low-battery detector.
In dual-mode applications, the APW7075 draws power
from any available 5V USB connection and reverts to
battery power when the USB power is removed.
• Built-In a 500mA LDO and Synchronous Step-Up
DC-DC Converter
• Built-In PWM/PFM Operating Mode
• Provided Dual Input Power Sources
• Connect FB to OUT for 3.3V Output Voltage or
GND for 2.5V Output Voltage or an External
Resistor Divider for Adjustable Output Voltage.
• Fixed 300KHz Operating Frequency
• High Efficiency Up to 94% at 200mA Output
Current
• 0.6V to 4.5V Operating Voltage
• 1V Start Up Input Voltage
• Low Battery Voltage Detection
• Reverse Voltage Protection
• Internal Synchronous Rectifier
• Automatic Detection Input Voltage
• Compact SOP-8-P and TSSOP-8 Packages
• Lead Free Available (RoHS Compliant)
Pin Description
VIN
SHDN
FB
LBI LBO
GND
LX
OUT1
2
3
4 5
6
7
8 VIN
SHDN
FB
LBI LBO
GND
LX
OUT1
2
3
4 5
6
7
8
= Thermal Pad
(connected to GND plane for better heat
dissipation)
TSSOP-8 Top View SOP-8-P Top View