S-8327 Seiko, S-8327 Datasheet - Page 22

• Manufacturer Part Number: S-8327
• Description: (S-8323 / S-8327) SMALL PACKAGE PWM CONTROL STEP-UP SWITCHING REGULATOR
• Manufacturer: Seiko

4. PDA/Digital Camera Power Supply
Output
Voltage
V
OUT
The following are a circuit example and its characteristics showing a 3-V system drive (3V/200mA) powered by 4 secondary
Nicd batteries (3.6 to 4.8V), 2 lithium-ion batteries (4.8 to 8.8V) or 4 alkaline-manganese batteries (3.6 to 6.0V).
(V)
(a) Output Current - Output Voltage
3.05
3.03
3.01
2.99
2.97
2.95
0.01
V
(10mV/div)
Output
Voltage
Point A
Voltage
IN
(1V/div)
Output Current I
SMALL PACKAGE PWM CONTROL STEP-UP SWITCHING REGULATOR
0.1
3V
0V
+
-
C
IN
(c) Ripple Characteristics
1.
R
E
OUT
5.1k
VIN=3.3V
VIN=3.6V
VIN=4.8V
VIN=7.2V
2SA1213/TOSHIBA
R
V
10.
b
DD
(mA)
CONT
750
S-8324D30
Seiko Instruments Inc.
A
100.
t (10 sec/div)
Figure 20
Figure 21
SD
1000.
V
OUT
Figure 22
V
S
MA720
Efficiency
CD54/100 H
(%)
VIN=3.6V IOUT=300mA
L
(b)Output Current - Efficiency
100
80
60
40
20
0
0.01
C
OUT
+
-
Output Current I
0.1
F93
22 F
3V
1.
S-8323/8327 Series
OUT
10.
(mA)
VIN=3.3V
VIN=3.6V
VIN=4.8V
VIN=7.2V
100.
1000.
21