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PDF APW7079 Data sheet ( Hoja de datos )
| Número de pieza | APW7079 | |
| Descripción | Low-Supply-Current Synchronous Step-up DC-DC Converter | |
| Fabricantes | ANPEC | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de APW7079 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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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
SOT 89
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
VIN=0.9V
VIN=1.0V
VIN=1.2V
VIN=2.4V
VIN=1.5V
APW7079-30
1 10 100 1000
Top View
Simplified Application Circuit
VIN IIN
L1
22µH
C1
22µF
LX VOUT
GND
IOUT VOUT
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.4 - Jun., 2009
1
www.anpec.com.tw
1 page  
APW7079
Typical Operating Characteristics (Cont.)
(Refer to the application circuit in the section “Typical Application Circuit”, VIN=1.5V, L1=22µH, TA=25oC unless otherwise noted.)
Start-up/Hold-on Voltage vs.
Output Current
1.4
Start-up/Hold-on Voltage vs.
Output Current
1.4
1.2 Start-up
1
1.2 Start-up
1
0.8
0.6
0.4
0.2
0
0
Hold-on
APW7079-18
10 20 30 40 50
0.8
0.6
0.4
0.2
0
0
Hold-on
APW7079-30
10 20 30 40 50
1.4
1.2
1
0.8
0.6
0.4
0.2
0
0
Start-up/Hold-on Voltage vs.
Output Current
Start-up
Hold-on
APW7079-50
10 20 30 40 50
No Load Battery Current
vs. Input Voltage
70
60
50
40
30 APW7079-50
20
10 APW7079-18
APW7079-30
0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
Main Switch ON Resistance vs.
Junction Temperature
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
-50
APW7079-18
APW7079-30
APW7079-50
-25 0 25 50 75 100 125
Synchronous Switch ON Resis-
tance vs. Junction Temperature
1.6
1.4
1.2
1.0
0.8
0.6
APW7079-18
0.4
APW7079-30
0.2 APW7079-50
0.0
-50 -25
0
25 50 75 100 125
Copyright © ANPEC Electronics Corp.
Rev. A.4 - Jun., 2009
5
www.anpec.com.tw
5 Page 
APW7079
Application Information (Cont.)
Layout Consideration (Cont.)
Copyright © ANPEC Electronics Corp.
Rev. A.4 - Jun., 2009
11
www.anpec.com.tw
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet APW7079.PDF ] | |
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