APW7093
Typical Application
APW7093
V
IN
33
µ
F
IN
LX
PGND
VCC
SHDN
V
EXTREF
EXTREF
TOFF
R
TOFF
GND
R2
FB
REF
SS
0.1
µ
F
0.01
µ
F
50KΩ
220µF
15mΩ
L
V
OUT
10Ω
1
µ
F
FOR VIN =5V: L=1mH, RTOFF=100kW
FOR VIN=3.3V: L=0.68mH, RTOFF=68kW
Fig2. Typical Applicatin Circuit
Typical Characteristics
(Circuit of Figure2, V
OUT
=1.25V, for V
IN
=3.3V: L: 0.68µH, R
TOFF
=68kΩ; for V
IN
=5V: L=1µH, T
OFF
=100kΩ. T
A
=25C
if not specially)
Effienciency vs. Output Current
100
95
90
85
No Load Supply Current vs. Input Voltage
50
V
IN
=5V, V
OUT
=3.3V
No Load Supply Current(mA)
40
Efficiency(%)
80
75
70
65
60
55
50
45
40
0
1
2
3
30
V
IN
=5V, V
OUT
=1.25V
V
IN
=5V, V
OUT
=2.5V
V
IN
=3.3V, V
OUT
=1.25V
V
OUT
=1.25V
R
TOFF
=68kΩ
20
10
0
0
1
2
3
4
5
6
Output Current(A)
Input Voltage(V)
Copyright
©
ANPEC Electronics Corp.
Rev. A.5 - Jun., 2005
6
www.anpec.com.tw
ANPEC [ ANPEC ELECTRONICS COROPRATION ]
