APW7079
Low-Supply-Current Synchronous Step-up DC-DC Converter
Features
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•
•
•
•
•
•
•
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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)
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.
Efficiency vs. Output Current
100
Applications
Efficiency (%)
90
80
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•
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Toy
Wireless Mouse
Portable Instrument
70
60
50
40
30
V
IN
=1.2V
V
IN
=1.5V
APW7079-30
0.1
1
10
100
1000
V
IN
=0.9V
V
IN
=1.0V
V
IN
=2.4V
Pin Configuration
SOT89
20
10
0
Output Current, I
OUT
(mA)
Simplified Application Circuit
VOUT
2
(TAB)
LX 3
GND 1
V
IN
I
IN
L1
22µH
C1
22µF
APW7079
LX
VOUT
GND
I
OUT
V
OUT
Top View
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.
Rev. A.3 - Oct., 2008
1
www.anpec.com.tw
ANPEC [ ANPEC ELECTRONICS COROPRATION ]
