S-8426A Series
www.ablic.com
www.ablicinc.com
© ABLIC Inc., 2006-2015
BATTERY BACKUP SWITCHING IC
Rev.2.0
_03
The S-8426A Series is a CMOS IC designed for use in the switching circuits of primary and backup power supplies on a
single chip. It consists of two voltage regulators, three voltage detectors, a power supply switch and its controller, as well as
other functions.
In addition to the switching function between the primary and backup power supply, the S-8426A Series can provide the
micro controllers with three types of voltage detection output signals corresponding to the power supply voltage.
Moreover adopting a special sequence for switch control enables the effective use of the backup power supply, making this
IC ideal for configuring a backup system.
Features
Low power consumption
Normal operation:
15
A
Max. (V
IN
= 6 V)
Backup:
4.5
A
Max.
Voltage regulator
Output voltage tolerance :
2%
Output voltage:
Independently selectable in 0.1 V steps in the range of 2.3 to 5.4 V
Three built-in voltage detectors (CS,
PREEND
, RESET )
Detection voltage precision:
2%
Detection voltage:
Selectable in 0.1 V steps in the range of 2.4 to 5.3 V (CS voltage detector)
Selectable in 0.1 V steps in the range of 1.7 to 3.4 V (
PREEND
, RESET voltage
detector)
Switching circuit for primary power supply and backup power supply configurable on one chip
Efficient use of backup power supply possible
Special sequence
Backup voltage is not output when the primary power supply voltage does not reach the initial voltage at which the
switch unit operates.
Lead-free, Sn 100%, halogen-free
*1
*1.
Refer to “
Product Name Structure”
for details.
Applications
Video camera recorders
Still video cameras
Memory cards
SRAM backup equipment
Packages
8-Pin TSSOP
8-Pin SOP(JEDEC)
1
BATTERY BACKUP SWITCHING IC
S-8426A Series
Block Diagram
VOUT
Rev.2.0
_03
M1
VIN
REG2
VBAT
PREEND
V
sw1
Detector
PREEND
Voltage
detector
V
SW2
Detector
RESET
CS
CS
Voltage
detector
Switch
controller
RESET
Voltage
detector
VRO
REG1
VSS
Figure 1
2
Rev.2.0
_03
Product Name Structure
1.
Product Name
S-8426A
xx - xxxx
x
Environmental code
U
G
BATTERY BACKUP SWITCHING IC
S-8426A Series
: Lead-free (Sn 100%), halogen-free
: Lead-free (for details, please contact our sales office)
Package name (abbreviation) and IC packing specifications
*1
T8T1
J8T1
: 8-Pin TSSOP, Tape
: 8-Pin SOP(JEDEC), Tape
*2
Serial code
Sequentially set from AA to ZZ
*1.
*2.
Refer to the taping specifications.
Refer to the “3.
Product Name List”.
2.
Package
Package Name
Drawing Code
Tape
FT008-E-C-SD
FT008-E-C-SD
FJ008-D-C-SD
FJ008-D-C-SD
Package
FT008-A-P-SD
FT008-A-P-SD
FJ008-A-P-SD
FJ008-A-P-SD
Reel
FT008-E-R-SD
FT008-E-R-S1
FJ008-D-R-SD
FJ008-D-R-S1
8-Pin TSSOP
8-Pin SOP(JEDEC)
Environmental code = G
Environmental code = U
Environmental code = G
Environmental code = U
3.
Product Name List
Table 1
Output
Voltage
V
RO
5.000
Output
Voltage
V
OUT
5.000
CS
Voltage
V
DET1
4.500
CS
Voltage
V
DET1
V
OUT
0.95
RESET
RESET
PREEND
PREEND
Switch
Voltage
Model No.
Voltage
V
DET2
2.900
Voltage
V
DET2
3.068
Voltage
V
DET3
2.100
Voltage
V
DET3
2.207
V
SW1
V
DET4
*1
0.77
S-8426AAA-J8T1x
*1.
V
DET4
can be calculated by
V
DET1
with the following equation.
V
DET4
= (V
DET1
) + 15
{(V
DET1
)
0.8}
372
Caution
Remark 1.
Set the CS voltage so that the switch voltage (V
SW1
) is equal to or greater than the RESET detection
voltage (V
DET2
).
The selection range is as follows.
V
RO
, V
OUT
: 2.3 to 5.4 V (0.1 V steps)
V
DET1
:
2.4 to 5.3 V (0.1 V steps)
V
DET2
:
1.7 to 3.4 V (0.1 V steps )
V
DET3
:
1.7 to 3.4 V (0.1 V steps)
V
SW1
:
V
DET1
0.85 or
V
DET1
0.77
When V
SW2
>
V
DET1
,
V
DET4
0.85 or
V
DET4
0.77
If a product with a voltage other than above is required, contact our sales representative.
x: G or U
Please select products of environmental code = U for Sn 100%, halogen-free products.
2.
3.
4.
5.
3
BATTERY BACKUP SWITCHING IC
S-8426A Series
Pin Configurations
8-Pin TSSOP
Top view
1
2
3
4
8
7
6
5
Rev.2.0
_03
Table 2
Pin No.
1
2
3
4
5
6
7
8
Symbol
VSS
PREEND
VBAT
*1
CS
RESET
VOUT
*1
*1
VIN
VRO
*1
Description
Ground
Output pin of
PREEND
voltage detector
Backup power supply input pin
Output pin of CS voltage detector
Output pin of RESET voltage detector
Output pin of voltage regulator 2
Primary power supply input pin
Output pin of voltage regulator 1
Figure 2
*1.
Mount capacitors between VSS (GND pin) and the VIN, VBAT, VOUT,
and VRO pins. (Refer to the
“ Standard Circuit”)
8-Pin SOP(JEDEC)
Top view
Table 3
1
2
3
4
Figure 3
8
7
6
5
Pin No.
1
2
3
4
5
6
7
8
Symbol
VSS
PREEND
VBAT
*1
CS
RESET
VOUT
*1
VIN
*1
VRO
*1
Description
Ground
Output pin of
PREEND
voltage detector
Backup power supply input pin
Output pin of CS voltage detector
Output pin of RESET voltage detector
Output pin of voltage regulator 2
Primary power supply input pin
Output pin of voltage regulator 1
*1.
Mount capacitors between VSS (GND pin) and the VIN, VBAT, VOUT,
and VRO pins. (Refer to the
“ Standard Circuit”)
4
Rev.2.0
_03
Absolute Maximum Ratings
Table 4
BATTERY BACKUP SWITCHING IC
S-8426A Series
(Unless otherwise specified: Ta = 25
C)
Item
Primary power supply input voltage
Backup power supply input voltage
Output voltage of voltage regulator
CS output voltage
RESET output voltage
PREEND
output voltage
Symbol
V
IN
V
BAT
V
RO
, V
OUT
V
CS
V
RESET
V
PREEND
Absolute Maximum Tatings
V
SS
0.3
to V
SS
18
V
SS
0.3
to V
SS
18
V
SS
0.3
to V
IN
0.3
V
SS
0.3
to V
SS
18
V
SS
0.3
to V
SS
18
V
SS
0.3
to V
SS
18
700
850
*1
40
to
85
40
to
125
*1
Unit
V
V
V
V
V
V
mW
mW
C
C
8-Pin TSSOP
P
D
8-Pin SOP(JEDEC)
Operating ambient temperature
T
opr
Storage temperature
T
stg
*1.
At mounted on printed circuit board
[Mounted board]
(1) Board size: 114.3 mm × 76.2 mm × t1.6 mm
(2) Board name: JEDEC STANDARD51-7
Power dissipation
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.
1200
Power Dissipation (P
D
) [mW]
1000
800
600
400
200
0
0
50
100
150
8-Pin SOP(JEDEC)
8-Pin TSSOP
Ambient Temperature (Ta) [C]
Figure 4
Power Dissipation of Package (Mounted on Printed Circuit Board)
5
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