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Anpec Electronics Coropration

APW7077A Datasheet Preview

APW7077A Datasheet

PWM Step-Up DC-DC Converter

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APW7077/A
Features
Low Start-up Voltage 0.9V
Fixed 300kHZ Operating Frequency
Built-In Internal Soft Start Circuit
Low Operating Current
www.DataSheet4U.com
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-upDC-DCconverterwith anadaptive voltagemode
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
54
123
CE VOUT NC
SOT-23-5 (Top View)
APW7077
EXT GND
54
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.
Rev. A.4 - Sep, 2005
1
www.anpec.com.tw




Anpec Electronics Coropration

APW7077A Datasheet Preview

APW7077A Datasheet

PWM Step-Up DC-DC Converter

No Preview Available !

APW7077/A
Ordering and Marking Information
APW7077/A
Lead Free Code
Handling Code
Temp. Range
Package Code
Voltage Code
Package Code
B : SOT-23-5
Temp. Range
I : -40 to 85° C
Handling Code
TU : Tube
TR : Tape & Reel
Voltage Code
R : 3.3V
Z : 5.0V
Lead Free Code
L : Lead Free Device Blank : Original Device
www.DataSheet4U.com APW7077 B : 77RX XX - Date Code, R : 3.3V
APW7077A B : A77X X - Date Code
Note ANPEC lead-free products contain molding compounds/die attach materials and 100% matte tin plate
termination finish; which are fully compliant with RoHS and compatible with both SnPb and lead-free soldiering
operations. ANPEC lead-free products meet or exceed the lead-free requirements of IPC/JEDEC J STD-020C
for MSL classification at lead-free peak reflow temperature.
Block Diagram
VOUT
NC
GND
VDD
Phase
Compensation
VDD
VDD
Error Amp.
Vref=1.0V
PWM Comp.
PWM
Controller
RAMP
GEN.
Oscillator
Voltage
Reference
VDD
Soft-Start
Driver
CE
APW 7077
FB
GND
Phase
Compensation
VDD
VDD
Error Amp.
PWM Comp.
PWM
Controller
RAMP
GEN.
Oscillator
Voltage
Reference
VDD
Soft-Start
VDD
Driver
EXT
VDD
EXT
CE
Copyright © ANPEC Electronics Corp.
Rev. A.4 - Sep, 2005
APW7077A
2
www.anpec.com.tw


Part Number APW7077A
Description PWM Step-Up DC-DC Converter
Maker Anpec Electronics Coropration
Total Page 21 Pages
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