Contents
Applications........................................................
1
Block Diagram....................................................
1
Pin Assignment ..................................................
2
Absolute Maximum Ratings ...............................
2
Electrical Characteristics....................................
2
Test Circuits .......................................................
3
Operation Timing Chart......................................
4
Operation ...........................................................
5
Selection of External Parts.................................
9
Standard Circuits................................................ 11
Merits in Designing............................................. 12
PR
Notes on Design................................................. 12
UC
T
1
OD
Features .............................................................
Application Circuits............................................. 13
Characteristics ................................................... 14
DI
SC
ON
TI
NU
E
D
Dimensions, Taping ........................................... 22
STEP UP & DOWN VOLTAGE REGULATOR
S-8430AF
n Pin Assignment
2
1
2
8
7
3
4
VIN
ON/OFF
SEL1
SEL2
6
5
SEL1
4
SEL2
7
5
6
1
8
VSS
CONT
VSW
VOUT
ON/OFF
3
8-pin SOP
TOP view
Name
Description
CONT
VOUT
VSW
VIN
VSS
Shutdown
H: Normal operation L: Shutdown
Selects output voltage during shutdown
H: VOUT≅VIN, L: VOUT≅VSS
Selects normal operation output voltage
H: VOUT=5 V, L: VOUT=3 V
Output driver for external inductor
Output voltage
Switching regulator output
Positive power supply input
GND
UC
T
No.
Figure 2
n Absolute Maximum Ratings
Table 1
Symbol
VIN
VSW
V
V
V
V
300
-30 to +80
-40 to +125
mW
°C
°C
NU
E
D
PD
Topr
Tstg
Table 2
Parameter
Symbol
Input voltage
VIN
VOUT1
(Unless otherwise specified : Ta=25°C)
Conditions
Min.
Typ.
Max.
Unit
10.0
V
Test
circuit
1
VIN=2 V, IOUT=30 mA
SEL2=L, ON/OFF=H
VIN=3 V, IOUT=30 mA
SEL2=ON/OFF=H
VIN=3 V, Unloaded,
SEL1=SEL2=ON/OFF=H
VIN=7 V, Unloaded
SEL1=SEL2=H, ON/OFF=L
VIN=7 V, Unloaded
SEL1=L, SEL2=H, ON/OFF=L
VIN=3 V
VIN=3 to 10 V, IOUT=30 mA, SEL2=H
2.85
3.00
3.15
V
1
4.80
5.00
5.20
V
1
11
25
µA
2
2.0
µA
3
0.2
µA
3
20
40
0.1
70
0.2
kHz
%/V
4
1
VIN=2 to 10 V, IOUT=30 mA, SEL2=L
0.1
20
20
0.2
80
80
%/V
mV
mV
1
1
1
ON
TI
Output voltage*
VOUT2
ISS
ISSS1
ISSS2
fOSC
∆VOUT
∆VIN •VOU
SC
Oscillating frequency
Line regulation
Unit
VSS-0.3 to VSW+0.3
VSS-0.3 to 12
ON/OFF, SEL1, SEL2,
CONT
n Electrical Characteristics
Shutdown current
Ratings
12
VSS-0.3 to 12
VOUT
Power dissipation
Operating temperature
Storage temperature
Current consumption
Conditions
PR
Parameter
Input voltage
Output voltage of switching
regulator
Output voltage
Input pin voltage
OD
(Unless otherwise specified : Ta=25°C)
∆VOUT
VIN=3 V, IOUT=50 µA to 30 mA, SEL2=H
VIN=2 V, IOUT=50 µA to 30 mA, SEL2=L
Temperature coefficient of
VOUT
Switching current
Leakage current of
switching transistor
Input voltage for ON/OFF,
SEL1, and SEL2 pins
∆VOUT
∆Ta
ISW
ISWQ
Ta=-30°C to 80°C, SEL2=H or L
Output voltage during
shutdown
VSOUT1
DI
Load regulation
VSH
VSL
Oscillation duty ratio
Operation start voltage
VSOUT2
fD
VST
VDS=0.2 V, SEL2=H
VDS=10 V
VIN=3 V, H level
2.4
VIN=3 V, L level
VIN=VSW=7 V, unloaded
ON/OFF=L, SEL2=H
SEL1=L
0
SEL1=H
6.9
VIN=3 V
VOUT≥2 V, unloaded, SEL2=L
* External parts:
Coil: FL5H101K (100 µH) manufactured by Taiyo Yuden, or equivalent
Diode: D1NS4 manufactured by Shindengen, or equivalent
2
Seiko Instruments Inc.
0.9
±0.38
mV/°C
250
mA
1.0
µA
V
50
6
5
0.4
V
5
0.1
V
5
7.0
V
%
V
5
1
