APW7079 Datasheet, PDF (1/15 Pages) Anpec Electronics Coropration – Low-Supply-Current Synchronous Step-up DC-DC Converter

APW7079
Low-Supply-Current Synchronous Step-up DC-DC Converter
Features
• 0.9V Typical Start-up Input Voltage
• 11µA Typical No Load Quiescent Current
• PFM Operation
• High Efficiency up to 92%
• Fixed 1.8V, 2.6V, 2.8V, 3V, 3.3V, 3.8V, 4.5V or 5V
Output Voltage
• 600mA Internal Switch Current
• Internal Synchronous Rectifier
• SOT-89 Package
• Lead Free and Green Devices Available
(RoHS Compliant)
Applications
• Toy
• Wireless Mouse
• Portable Instrument
Pin Configuration
SOT89
General Description
The APW7079 is a compact, PFM mode, and step-up
DC-DC converter with low quiescent current. The inter-
nal synchronous rectifier reduces cost and PCB space
by eliminating the need for an external Schottky diode.
Low on-resistance of the internal switches improves the
efficiency up to 92%. The start-up voltage is guaranteed
below 1V. After start-up, the device can operate with input
voltage down to 0.7V. The APW7079 is suitable for por-
table battery-powered applications. Consuming only 11µA
quiescent current and an optimized control scheme al-
lows the device to operate at very high efficiency over the
entire load current range.
100
90
80
70
60
50
40
30
20
10
0
0.1
Efficiency vs. Output Current
V_IN=0.9V
V_IN=1.0V
V_IN=1.2V
V_IN=2.4V
V_IN=1.5V
APW7079-30
1
10
100
1000
Top View
Simplified Application Circuit
V_{IN IIN}
L1
22µH
C1
22µF
LX
VOUT
GND
I_OUT V_OUT
C2
47µF
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.3 - Oct., 2008
www.anpec.com.tw