Rev. 7.2
_20
SMALL PACKAGE PWM CONTROL
STEP-UP SWITCHING REGULATOR
S-8323/8327 Series
Features
•
•
Low voltage operation:
0.9 V(I
OUT
=1 mA, 50 kHz and 100 kHz models)
Low current consumption :
During operation: 17.2
µA
(typ.)
(V
OUT
= 3 V, 50 kHz)
During shutdown: 0.5
µA
(max.)
Duty ratio: Built-in PWM control circuit
External parts:
•
•
•
•
•
•
•
•
•
•
•
coil, diode, and capacitor only
(a transistor is needed for the S-8327 Series.)
Applications
•
•
•
Block Diagram
(1) S-8323 Series (Types A, C, H)
CONT
TI
NU
VOUT
Power supplies for portable equipment such as pagers, handy calculators, and remote controllers
Constant voltage power supplies for cameras, video equipment, and communications equipment
Power supply for microcomputers
ON
ED
Output voltage: accuracy of
±2.4%
PR
OD
PWM
control
circuit
Soft start
circuit
ON/ OFF
Soft start
circuit
(2) S-8327 Series (Types B, H)
VOUT
SC
VREF
PWM
control
circuit
+
-
EXT
DI
Soft start
circuit
VSS
UC
T
VREF
+
-
The S-8323/8327 Series is a CMOS PWM-control step-up switching
regulator which mainly consists of a reference voltage source, an oscillation
circuit, a power MOS FET (for S-8323 Series) , and an error amplifier.
Equipped with best-designed control circuits, the products maintain high
efficiency over a wide range of conditions with the capability of automatically
controlling the duty ratio from 0% to 83% (78% for 250 kHz model)
according to each applied load. A step-up switching regulator is constructed
by externally connecting only a coil, a capacitor and a diode to the S-8323
Series. This feature, along with its small package and low current
consumption, makes the S-8323 Series ideal for the power supply of
portable equipment. For applications requiring a high output current,
products used with an external transistor (S-8327 Series) are also available.
Oscillation frequency: 30 kHz, 50 kHz, 100 kHz, and
250 kHz
Software start function is built-in
External transistor type is available (S-8327 Series)
SOT-23-5 small plastic package
SOT-23-3 small plastic package
SOT-89-3 miniature power molded plastic package
Step-down and voltage-inverting type are available.
Shutdown function
VSS
ON/ OFF
(3) S-8323 Series (Types D, J)
CONT
VDD
PWM
control
circuit
Soft start
circuit
VOUT
VDD
VREF
+
-
(4) S-8327 Series (Types E, J)
VOUT
EXT
PWM
control
circuit
VREF
+
-
VSS
VSS
Figure 1 Block Diagram
Seiko Instruments Inc.
1
SMALL PACKAGE PWM CONTROL STEP-UP SWITCHING REGULATOR
S-8323/8327 Series
Rev. 7.2
_20
Selection Guide
1. Product Name
S-832 x x xx xx - xxx - T2
Tape Specification
Product name (abbreviation)
Package name (abbreviation)
MA : SOT-23-3 (without shutdown function)
MC : SOT-23-5 (with shutdown function, V
DD
/V
OUT
separate product)
UA : SOT-89-3 (without shutdown function)
Output voltage x 10
Power transistor
3: Built-in switch.
7: External transistor
2. Function List
Product Name
S-8323AxxMC
S-8323AxxMA
S-8323AxxUA
S-8323DxxMC
S-8323CxxMA
S-8323HxxMC
S-8323JxxMC
S-8327BxxMC
S-8327BxxMA
S-8327BxxUA
S-8327ExxMC
S-8327HxxMC
S-8327JXxxC
Yes
Yes
Yes
Yes
Yes
Yes
Yes
TI
NU
V /V
Built In with external Switching
shutdown
DD OUT
frequency
power
power
separate
function
(kHz)
transistor
transistor
type
50
50
50
50
30
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
ED
PR
OD
Package
Application
SOT-23-5 With shutdown function
SOT-23-3 Without shutdown function
SOT-89-3 Without shutdown function
For variable output voltage by step-up DC/DC
SOT-23-5 converter and step-down, inverted output DC/DC
converter with an external resistor
SOT-23-3 For pagers
SOT-23-5 With shutdown function
For variable output voltage by step-up DC/DC
SOT-23-5 converter and step-down, inverted output DC/DC
converter with an external resistor
SOT-23-5 For large load current with shutdown function
SOT-23-3 For large load current without shutdown function
SOT-89-3 For large load current without shutdown function
For variable output voltage by step-up DC/DC
SOT-23-5 converter with an external resistor
SOT-23-5 For large load current without shutdown function
For variable output voltage by step-up DC/DC
SOT-23-5 converter with an external resistor
SC
Yes
Yes
Yes
Yes
Yes
Yes
DI
2
ON
250
250
100
100
100
100
250
250
Seiko Instruments Inc.
UC
T
fosc=50 kHz
fosc=100 kHz
fosc=30 kHz
fosc=50 kHz
fosc=100 kHz
fosc=250 kHz
fosc=250 kHz
Product category
A : Normal product,
B : Normal product,
C : For pagers,
D : V
DD
/V
OUT
separate product,
E : V
DD
/V
OUT
separate product,
H : Normal product,
J : V
DD
/V
OUT
separate product,
(S-8323 only)
(S-8327 only)
(S-8323 only)
(S-8323 only)
(S-8327 only)
(S-8323 / 7)
(S-8323 / 7)
Rev. 7.2
_20
3. Product Name List
Output voltage
(V)
2.0
2.5
2.7
2.8
3.0
3.3
3.8
4.4
4.8
5.0
5.2
Output voltage
(V)
2.5
3.0
3.3
4.8
5.0
Output voltage
(V)
2.0
2.5
2.7
2.8
3.0
3.2
3.3
3.6
4.8
5.0
5.2
5.4
5.6
6.0
7.0
Output voltage
(V)
2.5
3.0
3.3
3.6
5.0
5.2
5.6
SMALL PACKAGE PWM CONTROL STEP-UP SWITCHING REGULATOR
S-8323/8327 Series
S-8323AXXMC
Series
S-8323A20MC-ELA-T2
S-8323A25MC-ELF-T2
S-8323A27MC-ELH-T2
S-8323A28MC-ELI-T2
S-8323A30MC-ELK-T2
S-8323A33MC-ELN-T2
S-8323A38MC-ELS-T2
S-8323A44MC-ELY-T2
S-8323A48MC-EMC-T2
S-8323A50MC-EME-T2
S-8323A52MC-EMG-T2
S-8323HXXMC
Series
S-8323H30MC-F4K-T2
S-8323H33MC-F4N-T2
S-8323H48MC-F5C-T2
S-8323H50MC-F5E-T2
S-8327BXXMC
Series
S-8327B25MC-ERF-T2
S-8327B27MC-ERH-T2
S-8327B28MC-ERI-T2
S-8327B30MC-ERK-T2
S-8327B32MC-ERM-T2
S-8327B33MC-ERN-T2
S-8327B36MC-ERQ-T2
S-8327B48MC-ESC-T2
S-8327B50MC-ESE-T2
S-8327B52MC-ESG-T2
S-8327B54MC-ESI-T2
S-8327B60MC-ESO-T2
S-8323AXXMA
Series
S-8323A25MA-ELF-T2
S-8323A27MA-ELH-T2
S-8323A30MA-ELK-T2
S-8323A33MA-ELN-T2
S-8323A50MA-EME-T2
S-8323JXXMC
Series
S-8323J25MC-FQF-T2
S-8323J30MC-FQK-T2
S-8323J33MC-FQN-T2
S-8323J50MC-FRE-T2
S-8327BXXMA
Series
S-8327B25MA-ERF-T2
S-8327B27MA-ERH-T2
S-8327B30MA-ERK-T2
S-8327B33MA-ERN-T2
S-8327B50MA-ESE-T2
S-8323AXXUA
Series
S-8323A25UA-ELF-T2
S-8323A27UA-ELH-T2
S-8323A30UA-ELK-T2
S-8323A33UA-ELN-T2
S-8323A50UA-EME-T2
S-8323CXXMA
Series
S-8323C25MA-ENF-T2
S-8323C27MA-ENH-T2
S-8323C30MA-ENK-T2
S-8323DXXMC
Series
S-8323D20MC-EZA-T2
S-8323D30MC-EZK-T2
S-8323D50MC-E3E-T2
Consult our sales person for products with an output voltage other than specified above.
DI
SC
S-8327HXXMC
Series
S-8327H30MC-FWK-T2
S-8327H33MC-FWN-T2
S-8327H36MC-FWQ-T2
S-8327H50MC-FXE-T2
S-8327H52MC-FXG-T2
S-8327H56MC-FXK-T2
ON
TI
NU
S-8327BXXUA
Series
S-8327B25UA-ERF-T2
S-8327B27UA-ERH-T2
S-8327B30UA-ERK-T2
S-8327B33UA-ERN-T2
S-8327B50UA-ESE-T2
S-8327JXXMA
Series
S-8327J25MC-F8F-T2
S-8327J30MC-F8K-T2
S-8327J33MC-F8N-T2
S-8327J50MC-F9E-T2
Seiko Instruments Inc.
ED
PR
OD
UC
T
S-8327EXXMC
Series
S-8327E20MC-EVA-T2
S-8327E50MC-EKE-T2
S-8327E70MC-EKY-T2
3
SMALL PACKAGE PWM CONTROL STEP-UP SWITCHING REGULATOR
S-8323/8327 Series
Pin Assignment
5
SOT-23-5
Top view
4
SOT-23-3
Top view
2
SOT-89-3
Top view
Rev. 7.2
_20
1
2
3
1
3
Figure 2
1
2
3
Products: S-8323AxxMC, S-8327BxxMC
S-8323HxxMC, S-8327HxxMC
Package: SOT-23-5
Pin No.
1
2
3
4
5
Functions
Shutdown pin
“H”: normal operation
(stepping up operation)
ON / OFF
“L”: stop stepping up
(whole circuit stop)
voltage pin and power
VOUT Output pin
supply
N.C. (Non Connection)
VSS
GND pin
External inductor connection
CONT pin (for S-8323 Series)
External transistor connection
EXT
pin (for S-8327 Series)
Pin name
Products: S-8323DxxMC, S-8327ExxMC
S-8323JxxMC, S-8327JxxMC
Package: SOT-23-5
CONT
5
EXT
2
3
SC
Absolute Maximum Ratings
ON
TI
NU
Pin No.
1
Pin name
Functions
VSS
GND pin
voltage pin and power
VOUT Output pin
supply
External inductor connection
CONT pin (for S-8323 Series)
External transistor connection
EXT
pin (for S-8327 Series)
Parameter
Symbol
V
OUT
, V
DD
V
ON/OFF
V
CONT
I
CONT
V
EXT
I
EXT
ED
(Unless otherwise specified: Ta=25°C)
Ratings
V
SS
−0.3
to V
SS
+11
V
SS
−0.3
to V
SS
+11
V
SS
−0.3
to V
SS
+11
300
V
SS
−0.3
to V
OUT
+0.3
±50
500
150
−40
to +85
−40
to +125
Unit
V
V
V
mA
V
mA
mW
°C
°C
Products: S-8323AxxMA, S-8323AxxUA, S-8323CxxMA
S-8327BxxMA, S-8327BxxUA
Packages: SOT-23-3, SOT-89-3
VOUT, VDD pin voltage
ON/OFF pin voltage
CONT pin voltage
CONT pin current
EXT pin voltage
EXT pin current
Power dissipation
Operating temperature
Storage temperature
DI
PD
SOT-89-3
SOT-23-5, SOT-23-3
T
OPR
T
STG
Caution The absolute maximum ratings are rated values exceeding which the product
could suffer physical damage. These values must therefore not be exceeded
under any conditions.
4
Seiko Instruments Inc.
PR
OD
UC
T
Pin No.
1
2
3
4
Pin name
VOUT
VDD
VSS
Functions
Output voltage pin
Power supply pin
N.C. (Non Connection)
GND pin
External inductor connection
pin (for S-8323 Series)
External transistor connection
pin (for S-8327 Series)
Rev. 7.2
_20
SMALL PACKAGE PWM CONTROL STEP-UP SWITCHING REGULATOR
S-8323/8327 Series
Electrical Characteristics
1-1. S-8323AxxMC
Parameter
Output voltage
Symbol
V
OUT
Conditions
S-8323A52MC
S-8323A50MC
S-8323A33MC
S-8323A30MC
S-8323A27MC
S-8323A25MC
I
OUT
=1 mA
No external parts, voltage applied to V
OUT
CONT pulled up to 5 V by 10 kΩ
I
OUT
=1 mA,
Measured by decreasing V
IN
voltage gradually
V
OUT
=output voltage×0.95
S-8323A52MC
S-8323A50MC
S-8323A33MC
S-8323A30MC
S-8323A27MC
S-8323A25MC
V
OUT
=output voltage+0.5
S-8323A52MC
S-8323A50MC
S-8323A33MC
S-8323A30MC
S-8323A27MC
S-8323A25MC
V
ON/OFF
=0 V
V
CONT
=0.4 V
Min.
5.075
4.880
3.221
2.928
2.635
2.440
0.7
(Unless otherwise specified: Ta=25°C)
Typ.
Max.
Unit
Test circuit
5.200
5.000
3.300
3.000
2.700
2.500
31.6
30.2
19.1
17.2
15.5
14.3
3.5
3.5
3.3
3.2
3.2
3.2
182
182
125
125
98
98
30
30
±0.26
±0.25
±0.17
±0.15
±0.14
±0.13
50
83
6.0
87
87
83
83
79
79
5.325
5.120
3.379
3.072
2.765
2.560
9
0.9
0.8
52.6
50.3
31.8
28.7
25.9
23.9
6.9
6.9
6.5
6.4
6.4
6.3
0.5
1.0
60
60
57.5
90
0.3
0.2
12.0
ms
%
1
mA
µA
V
1
Input voltage
Operation start voltage
Oscillation start voltage
Operation holding voltage
Current consumption 1
V
IN
V
ST1
V
ST2
V
HLD
I
SS1
2
1
2
Current consumption 2
I
SS2
Current consumption during
shutdown
Switching current
I
SSS
I
SW
∆V
OUT
/∆Ta
Ta=-40°C to +85°C
Oscillation frequency
Max. duty ratio
f
osc
MaxDuty
V
SH
Shutdown pin
Input voltage
(ON/OFF type)
Soft start time
Efficiency
V
SL1
V
SL2
SC
V
OUT
=output voltage×0.95
Measured waveform at CONT pin
V
OUT
=output voltage×0.95
Measured waveform at CONT pin
V
OUT
=output voltage×0.95
Judged the oscillation at CONT pin
When
V
OUT
=output voltage×0.95
V
OUT
≥1.5
V
Judged the stop of oscillation
When
at CONT pin
V
OUT
<1.5 V
S-8323A52MC
S-8323A50MC
S-8323A33MC
S-8323A30MC
S-8323A27MC
S-8323A25MC
TI
NU
Switching transistor leak
current
Line regulation
Load regulation
Output voltage
temperature
coefficient
PR
OD
S-8323A52MC
S-8323A50MC
S-8323A33MC
S-8323A30MC
S-8323A27MC
S-8323A25MC
UC
T
114
114
78
78
61
61
42.5
75
0.75
3.0
∆V
OUT1
∆V
OUT2
V
IN
=output voltage×0.4 to
×0.6
I
OUT
=10
µA
to I
OUT
(below)
×1.25
ED
I
SWQ
V
OUT
= V
CONT
=10 V
µA
mV
mV/°C
1
S-8323A52MC
S-8323A50MC
S-8323A33MC
S-8323A30MC
S-8323A27MC
S-8323A25MC
kHz
%
V
2
t
SS
EFFI
External parts used:
- Coil:
CD54 (100
µH)
of Sumida Corporation
- Diode:
MA720 (Schottky type) of Matsushita Electronic Industrial Co., Ltd.
- Capacitor: F93 (16 V, 22
µF,
tantalum type) of Nichicon Corporation
Applied V
IN
=output voltage×0.6, applied, I
OUT
=output voltage/250
Ω
The shutdown pin is connected to VOUT pin.
Note 1: The output voltage specified above is the typical value.
DI
ON
Seiko Instruments Inc.
5
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