S-8327 Seiko, S-8327 Datasheet - Page 9

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

SMALL PACKAGE PWM CONTROL STEP-UP SWITCHING REGULATOR
S-8323/8327 Series
8
2-2.S-8327BXXMA, S-8327BXXUA, S-8327EXXMC
Output voltage
Input voltage
Operation start voltage
Oscillation start voltage
Operation holding voltage
Current consumption 1
Current consumption 2
EXT pin output current
Line regulation
Load regulation
Output voltage
temperature
coefficient
Oscillation frequency
Max. duty ratio
Soft start time
Efficiency
Applied V
The V
External parts used:
Note 1: The output voltage specified above is the typical value.
Note 2: V
- Coil:
- Diode:
- Capacitor: F93 (16V, 47 F, tantalum type) of Nichicon Corporation)
- Transistor: 2SD1628G of Sanyo Electronics
- Base resistor (Rb): 1.0K
- Base capacitor (Cb) : 2200pF (ceramic)
DD
Parameter
pin is connected to V
IN
Boot operation is performed from V
However, 2.0 V or more for V
DD/
=output voltage 0.6, I
V
OUT
Separate products:
CD54 (47 H) of Sumida Electric Co., Ltd.
MA720 (Schottky type) of Matsushita Electronic Components Co., Ltd.
OUT
Symbol
MaxDuty
V
OUT
pin for V
EFFI
V
I
OUT
V
V
V
I
fosc
V
V
I
I
EXTH
T
V
EXTL
SS1
SS2
OUT
HLD
ST1
ST2
OUT1
OUT2
SS
=output voltage/50
IN
/ Ta Ta=-40 C to +85 C
DD
DD
is recommended to stabilize the output voltage and oscilation frequency.
I
No external parts, voltage applied to V
I
voltage gradually B.
V
V
VCONT=-0.4V
VCONT=0.4V
V
I
Measured waveform at EXT pin
Measured waveform at EXT pin
V
V
/V
OUT
OUT
OUT
OUT
OUT
IN
OUT
OUT
DD
OUT
=output voltage 0.4 to 0.6
=1mA
=1mA, Measured by decreasing V
=10 A to I
=0.8V.
=output voltage 0.95
=output voltage+0.5
=output voltage 0.95
=output voltage 0.95
separate product.
OUT
Conditions
(below) 1.25
Seiko Instruments Inc.
S-8327X50XX
S-8327X33XX
S-8327X30XX
S-8327X27XX
S-8327X25XX
S-8327X20XX
S-8327X50XX
S-8327X33XX
S-8327X30XX
S-8327X27XX
S-8327X25XX
S-8327X20XX
S-8327X50XX
S-8327X33XX
S-8327X30XX
S-8327X27XX
S-8327X25XX
S-8327X20XX
S-8327X50XX
S-8327X33XX
S-8327X30XX
S-8327X27XX
S-8327X25XX
S-8327X20XX
S-8327X50XX
S-8327X33XX
S-8327X30XX
S-8327X27XX
S-8327X25XX
S-8327X20XX
S-8327X50XX
S-8327X33XX
S-8327X30XX
S-8327X27XX
S-8327X25XX
S-8327X20XX
S-8327X50XX
S-8327X33XX
S-8327X30XX
S-8327X27XX
S-8327X25XX
S-8327X20XX
IN
OUT
Min.
4.880
3.221
2.928
2.635
2.440
1.952
10.7
-5.3
-3.5
-3.5
-2.7
-2.7
-1.9
0.7
7.0
7.0
5.3
5.3
3.8
3.0
85
75
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
(Unless otherwise specified: Ta=25 C)
Typ.
5.000
3.300
3.000
2.700
2.500
2.000
±0.25
±0.17
±0.15
±0.14
±0.13
±0.10
16.0
10.5
10.5
37.6
23.7
21.4
19.2
17.8
14.5
-8.0
-5.3
-5.3
-4.0
-4.0
-2.9
100
4.2
4.0
3.9
3.9
3.9
3.8
8.0
8.0
5.7
6.0
30
30
83
88
84
84
80
80
76
—
—
—
—
Max.
5.120
3.379
3.072
2.765
2.560
2.048
62.6
39.5
35.7
32.0
29.7
24.1
12.0
115
0.9
0.8
8.3
7.9
7.8
7.7
7.7
7.6
60
60
90
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
9
mV/ C
Unit
kHz
mA
mV
ms
%
%
V
A
Test circuit
—
—
3
4
3
4
3
4
3