S-8424A Series
www.ablic.com
www.ablicinc.com
© ABLIC Inc., 2001-2010
BATTERY BACKUP SWITCHING IC
Rev.3.0_02
The S-8424A 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-8424A 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. (VIN 6 V)
Backup:
2.1 A Max.
Voltage regulator
Output voltage tolerance : 2 %
Output voltage:
Independently selectable in 0.1 V steps in the range of 2.3 V 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 V to 5.3 V (CS voltage detector)
Selectable in 0.1 V steps in the range of 1.7 V 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.
Packages
8-Pin TSSOP
8-Pin SON(B)
Applications
Video camera recorders
Still video cameras
Memory cards
SRAM backup equipment
1
BATTERY BACKUP SWITCHING IC
Rev.3.0_02
S-8424A Series
Product Name Structure
1. Product name
(1) 8-Pin TSSOP
S-8424A xx
FT - TB - x
Environmental code
U: Lead-free (Sn 100%), halogen-free
G: Lead-free (for details, please contact our sales office)
IC direction in tape specification
Package code
FT: 8-Pin TSSOP
Serial code
(2) 8-Pin SON(B)
S-8424A xx
PA - TF - G
Environmental code
G: Lead-free (for details, please contact our sales office)
IC direction in tape specification
Package code
PA: 8-Pin SON(B)
Serial code
2. Package
Package Name
8-Pin TSSOP
8-Pin SON(B)
2
Environmental code = G
Environmental code = U
Package
FT008-A-P-SD
FT008-A-P-SD
PA008-B-P-SD
Drawing Code
Tape
FT008-E-C-SD
FT008-E-C-SD
PA008-B-C-SD
Reel
FT008-E-R-SD
FT008-E-R-S1
PA008-B-R-SD
BATTERY BACKUP SWITCHING IC
S-8424A Series
Rev.3.0_02
3. Product name list
Part No.
Package
Output
CS Voltage
RESET
PREEND
Switch Voltage
Voltage
(V)
Voltage
Voltage
(V)
(V)
Type
(V)
VRO
3.000
VDET1
3.300
VDET1
3.401
VDET2
2.200
VDET2
2.312
VDET3
2.600
VDET3
VSW1
2.748
VDET1 0.85
S-8424AAAFT-TB-x
8-Pin TSSOP
S-8424AAAPA-TF-G
8-Pin SON(B)
S-8424AABFT-TB-x
8-Pin TSSOP
3.300
3.300
4.000
4.129
2.300
2.420
2.500
2.640
VDET1 0.77
S-8424AACFT-TB-x
8-Pin TSSOP
3.200
3.200
3.300
3.401
2.400
2.528
2.600
2.748
VDET1 0.85
S-8424AADFT-TB-x
8-Pin TSSOP
5.000
5.000
4.600
4.753
2.300
2.420
2.500
2.640
VDET1 0.77
S-8424AAEFT-TB-x
8-Pin TSSOP
3.150
3.150
4.200
4.337
2.300
2.420
2.500
2.640
VDET1 0.77
S-8424AAFFT-TB-x
8-Pin TSSOP
3.200
3.200
4.400
4.545
2.400
2.528
2.600
2.748
VDET1 0.77
S-8424AAGFT-TB-x
8-Pin TSSOP
2.800
2.800
4.400
4.545
2.400
2.528
2.600
2.748
VDET1 0.77
S-8424AAHFT-TB-x
8-Pin TSSOP
5.000
5.000
4.600
4.753
2.550
2.690
2.700
2.856
VDET1 0.77
S-8424AAJFT-TB-x
8-Pin TSSOP
3.100
3.100
4.400
4.545
2.200
2.312
2.600
2.748
VDET1 0.77
S-8424AAKFT-TB-x
8-Pin TSSOP
3.200
3.200
4.600
4.753
2.400
2.528
2.600
2.748
VDET1 0.77
Caution
3.000
(V)
VOUT
Set the CS voltage so that the switch voltage (VSW1) is equal to or greater than the
RESET detection voltage (VDET2).
Remark 1. The selection range is as follows.
VRO, VOUT: 2.3 to 5.4 V (0.1 V steps)
2.4 to 5.3 V (0.1 V steps)
VDET1:
1.7 to 3.4 V (0.1 V steps )
VDET2:
1.7 to 3.4 V (0.1 V steps)
VDET3:
VDET1 0.85 or VDET1 0.77
VSW1:
2. If a product with a voltage other than above is required, contact our sales representative.
3. x: G or U
4. Please select products of environmental code = U for Sn 100%, halogen-free products.
3
BATTERY BACKUP SWITCHING IC
Rev.3.0_02
S-8424A Series
Block Diagram
VOUT
M1
VIN
VBAT
REG2
PREEND
PREEND
Voltage
detector
VSW1
Detector
CS
RESET
CS
Voltage
detector
VSW2
Detector
RESET
Voltage
detector
Switch
controller
REG1
VSS
Figure 1
4
Block Diagram
VRO
BATTERY BACKUP SWITCHING IC
S-8424A Series
Rev.3.0_02
Pin Configurations
Table 1
8-Pin TSSOP
Top View
VSS
PREEND
VBAT
CS
1
2
8
7
VRO
3
4
6
5
VOUT
VIN
RESET
Pin No.
1
2
3
4
5
6
7
8
Figure 2
Symbol
VSS
Description
Ground
PREEND
VBAT*1
CS
Output pin of PREEND voltage detector
Backup power supply input pin
Output pin of CS voltage detector
RESET
VOUT*2
VIN*3
VRO*4
Output pin of RESET voltage detector
Output pin of voltage regulator 2
Primary power supply input pin
Output pin of voltage regulator 1
*1 to *4. Mount capacitors between VSS (GND pin) and the VIN, VBAT,
VOUT, and VRO pins. (Refer to the “Standard Circuit”)
Table 2
8-Pin SON(B)
Top View
VSS 1
PREEND 2
8 VRO
7 VIN
6 VOU T
5 RESET
3
CS 4
VBAT
Figure 3
Pin No.
1
2
3
4
5
6
7
8
Symbol
VSS
Description
Ground
PREEND
VBAT*1
CS
Output pin of PREEND voltage detector
Backup power supply input pin
Output pin of CS voltage detector
RESET
VOUT*2
VIN*3
VRO*4
Output pin of RESET voltage detector
Output pin of voltage regulator 2
Primary power supply input pin
Output pin of voltage regulator 1
*1 to *4. Mount capacitors between VSS (GND pin) and the VIN, VBAT,
VOUT, and VRO pins. (Refer to the “Standard Circuit”)
5
BATTERY BACKUP SWITCHING IC
Rev.3.0_02
S-8424A Series
Absolute Maximum Ratings
Table 3
Parameter
Primary power supply input voltage
Absolute Maximum Ratings
(Unless otherwise specified: Ta 25C)
Symbol
Ratings
Unit
V
VIN
VSS0.3 to VSS18
Backup power supply input voltage
Output voltage of voltage regulator
VBAT
VRO, VOUT
VSS0.3 to VIN0.3
VCS
VSS0.3 to VSS18
CS output voltage
RESET output voltage
V RESET
PREEND output voltage
Power dissipation
8-Pin TSSOP
V PREEND
PD
300 (When not mounted on board)
700*1
300 (When not mounted on board)
750*1
mW
Operating ambient temperature
Topr
40 to 85
C
Storage temperature
Tstg
40 to 125
8-Pin SON(B)
*1. When mounted on board
[Mounted board]
(1) Board size: 114.3 mm 76.2 mm t1.6 mm
(2) Board name: JEDEC STANDARD51-7
Power Dissipation PD (mW)
(1)
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.
When mounted on board
800
700
(2)
8-Pin SON(B)
600
500
400
300 8-Pin TSSOP
200
100
0
0
50
100
150
Ambient Temperature Ta (C)
Figure 4
6
Power Dissipation PD (mW)
Caution
When not mounted on board
400
300
8-Pin TSSOP
200
100 8-Pin SON(B)
0
0
50
100
150
Ambient Temperature Ta (C)
Power Dissipation of Package
BATTERY BACKUP SWITCHING IC
S-8424A Series
Rev.3.0_02
Electrical Characteristics
1. S-8424AAAxx
Table 4
Parameter
Voltage regulator
Conditions
Min.
Typ.
Max.
Unit
3.060
V
mV
VIN 7.2 V, IRO 3 mA
2.940
3.000
Dropout voltage 1
Vdrop1
VIN 7.2 V, IRO 3 mA
41
59
Load stability 1
VRO1
VIN 7.2 V, IRO 0.1 to 10 mA
50
100
mV
Input stability 1
VRO2
VIN 4 to 16 V, IRO 3 mA
5
20
mV
Ta 40C to 85C
100
ppm/C
Output voltage temperature coefficient 1
Output voltage 2
VRO
Ta VRO
VOUT
VIN 7.2 V, IOUT 23 mA
2.940
3.000
3.060
V
Vdrop2
VIN 7.2 V, IOUT 23 mA
187
252
mV
Load stability 2
VOUT1
VIN 7.2 V, IOUT 0.1 to 60 mA
50
100
mV
Input stability 2
VOUT2
VIN 4 to 16 V, IOUT 23 mA
5
20
mV
Ta 40C to 85C
100
ppm/C
Dropout voltage 2
Output voltage temperature coefficient 2
Primary power input voltage
Voltage detector
Symbol
VRO
Output voltage 1
VOUT
Ta VOUT
VDET1
CS release voltage
VDET1
RESET detection voltage
VDET2
RESET release voltage
VDET2
PREEND detection voltage
VDET3
PREEND release voltage
VDET3
Operating voltage
Detection voltage temperature coefficient
Leakage current
VIN
CS detection voltage
Sink current
Switch unit
Electrical Characteristics
(Unless otherwise specified: Ta 25C)
16
V
3.234
3.300
3.366
V
3.319
3.401
3.482
V
2.156
2.200
2.244
V
2.256
2.312
2.367
V
2.548
2.600
2.652
V
VIN voltage detection
VOUT voltage detection
VBAT voltage detection
2.682
2.748
2.814
V
VIN or VBAT
1.7
16
V
VDET1
Ta VDET1
Ta 40C to 85C
100
ppm/C
VDET 2
Ta VDET 2
Ta 40C to 85C
100
ppm/C
VDET 3
Ta VDET 3
Ta 40C to 85C
100
ppm/C
Vopr
ISINK
ILEAK
VDS 0.5 V, VIN VBAT 2.0 V
VSW1
VBAT 2.8 V, VIN voltage detection
CS output inhibit voltage
VSW2
VBAT 3.0 V, VOUT voltage detection
VBAT switch leakage current
ILEAK
Switch voltage temperature coefficient
CS output inhibit voltage temperature
coefficient
Current consumption
1.50
2.30
mA
PREEND
1.50
2.30
mA
CS
1.50
2.30
mA
A
VDS 16 V, VIN 16 V
Switch voltage
VBAT switch resistance
RESET
Total
0.1
VDET1
0.83
0.85
0.87
2
3
V
4
V
5
VOUT
VOUT
VOUT
0.95
0.97
VIN 3.6 V, VBAT 0 V
0.1
A
6
RSW
∆VSW 1
∆Ta VSW 1
VIN Open, VBAT 3.0 V, IOUT 10 to 500 A
30
60
7
Ta 40C to 85C
100
ppm/C
4
∆VSW 2
∆Ta VSW 2
Ta 40C to 85C
100
ppm/C
5
VIN 3.6 V, VBAT 3.0 V, Unload
7
15
A
8
0.26
0.50
A
Ta 25C
1.0
2.1
A
Ta 85C
3.5
A
1.7
4.0
V
ISS1
IBAT2
Remark
VDET1
1
0.93
IBAT1
Backup power supply input voltage
VDET1
Test
Circuit
VBAT
VIN Open, VBAT 3.0 V, Unload
7
The number in the Test Circuit column corresponds to the circuit number in the “Test Circuit”section.
7
BATTERY BACKUP SWITCHING IC
Rev.3.0_02
S-8424A Series
2. S-8424AABxx
Table 5
Voltage regulator
Parameter
Voltage detector
Conditions
Min.
Typ.
Max.
Unit
VRO
VIN 6 V, IRO 30 mA
3.234
3.300
3.366
V
Dropout voltage 1
Vdrop1
VIN 6 V, IRO 30 mA
356
474
mV
Load stability 1
VRO1
VIN 6 V, IRO 0.1 to 40 mA
50
100
mV
Input stability 1
VRO2
VIN 6 to 16 V, IRO 30 mA
5
20
mV
VRO
Ta VRO
Ta 40C to 85C
100
ppm/C
Output voltage 2
VOUT
VIN 6 V, IOUT 50 mA
3.234
3.300
3.366
V
Dropout voltage 2
Vdrop2
VIN 6 V, IOUT 50 mA
401
540
mV
Output voltage temperature coefficient 1
Load stability 2
VOUT1
VIN 6 V, IOUT 0.1 to 60 mA
50
100
mV
Input stability 2
VOUT2
VIN 6 to 16 V, IOUT 50 mA
5
20
mV
Ta 40C to 85C
100
ppm/C
Primary power input voltage
VOUT
Ta VOUT
VDET1
CS release voltage
VDET1
RESET detection voltage
VDET2
RESET release voltage
VDET2
PREEND detection voltage
VDET3
PREEND release voltage
VDET3
Operating voltage
Detection voltage temperature coefficient
Leakage current
4.030
4.129
4.228
V
2.254
2.300
2.346
V
2.362
2.420
2.478
V
2.450
2.500
2.550
V
2.576
2.640
2.703
V
VOUT voltage detection
VBAT voltage detection
16
V
Ta 40C to 85C
100
ppm/C
VDET 2
Ta VDET 2
Ta 40C to 85C
100
VDET 3
Ta VDET 3
Ta 40C to 85C
100
ppm/C
RESET
1.50
2.30
mA
PREEND
1.50
2.30
mA
CS
1.50
2.30
mA
0.1
A
VDET1
VDET1
VDET1
0.75
0.77
0.79
ISINK
ILEAK
VBAT switch leakage current
ILEAK
Current consumption
V
V
VSW2
CS output inhibit voltage temperature
16
4.080
1.7
CS output inhibit voltage
coefficient
4.000
VIN or VBAT
Vopr
VSW1
Switch voltage temperature coefficient
3.920
VIN voltage detection
VDET1
Ta VDET1
Switch voltage
VBAT switch resistance
VIN
CS detection voltage
Sink current
Switch unit
Symbol
Output voltage 1
Output voltage temperature coefficient 2
RSW
∆VSW 1
∆Ta VSW 1
∆VSW 2
∆Ta VSW 2
ISS1
VDS 0.5 V, VIN VBAT 2.0 V
VDS 16 V, VIN 16 V
VBAT 2.8 V, VIN voltage detection
VBAT 3.0 V
VOUT voltage detection
Total
IBAT2
Remark
VBAT
VOUT
VOUT
VOUT
0.93
0.95
0.97
Test
Circuit
1
2
ppm/C
3
V
4
V
5
VIN 6V, VBAT 0 V
0.1
A
6
VIN Open, VBAT 3.0 V, IOUT 10 to 500 A
30
60
7
Ta 40C to 85C
100
ppm/C
4
Ta 40C to 85C
100
ppm/C
5
VIN 6 V, VBAT 3.0 V, Unload
7
15
A
8
A
0.26
0.50
Ta 25C
1.0
2.1
A
Ta 85C
3.5
A
1.7
4.0
V
IBAT1
Backup power supply input voltage
8
Electrical Characteristics
(Unless otherwise specified: Ta 25C)
VIN Open, VBAT 3.0 V, Unload
The number in the Test Circuit column corresponds to the circuit number in the “Test Circuit” section.
7
BATTERY BACKUP SWITCHING IC
S-8424A Series
Rev.3.0_02
3. S-8424AACxx
Table 6
Parameter
Voltage regulator
Conditions
Min.
Typ.
Max.
Unit
VIN 3.6 V, IRO 15 mA
3.136
3.200
3.264
V
Dropout voltage 1
Vdrop1
VIN 3.6 V, IRO 15 mA
181
243
mV
Load stability 1
VRO1
VIN 3.6 V, IRO 0.1 to 20 mA
50
100
mV
Input stability 1
VRO2
VIN 3.6 to 16 V, IRO 15 mA
5
20
mV
Ta 40C to 85C
100
ppm/C
Output voltage temperature coefficient 1
Output voltage 2
VRO
Ta VRO
VOUT
VIN 3.6 V, IOUT 15mA
3.136
3.200
3.264
V
Vdrop2
VIN 3.6 V, IOUT 15 mA
123
167
mV
Load stability 2
VOUT1
VIN 3.6 V, IOUT 0.1 to 20 mA
50
100
mV
Input stability 2
VOUT2
VIN 3.6 to 16 V, IOUT 15 mA
5
20
mV
Ta 40C to 85C
100
ppm/C
Dropout voltage 2
Output voltage temperature coefficient 2
Primary power input voltage
Voltage detector
Symbol
VRO
Output voltage 1
VOUT
Ta VOUT
VDET1
CS release voltage
VDET1
RESET detection voltage
VDET2
RESET release voltage
VDET2
PREEND detection voltage
VDET3
PREEND release voltage
VDET3
Operating voltage
Detection voltage temperature coefficient
Leakage current
VIN
CS detection voltage
Sink current
Switch unit
Electrical Characteristics
(Unless otherwise specified: Ta 25C)
VIN voltage detection
VOUT voltage detection
VBAT voltage detection
2.352
2.400
2.448
V
2.467
2.528
2.589
V
2.548
2.600
2.652
V
2.682
2.748
2.814
V
100
ppm/C
VDET 2
Ta VDET 2
Ta 40C to 85C
100
ppm/C
VDET 3
Ta VDET 3
Ta 40C to 85C
100
ppm/C
ISINK
ILEAK
VDS 0.5 V, VIN VBAT 2.0 V
1.50
2.30
mA
PREEND
1.50
2.30
mA
CS
1.50
2.30
mA
3
0.1
A
VDET1
VDET1
VDET1
V
4
0.83
0.85
0.87
V
5
A
6
VOUT
VOUT
0.95
0.97
VIN 3.6 V, VBAT 0 V
0.1
VIN Open, VBAT 3.0 V, IOUT 10 to 500 A
30
60
7
100
ppm/C
4
100
ppm/C
5
8
∆VSW 2
∆Ta VSW 2
Ta 40C to 85C
VIN 3.6 V, VBAT 3.0 V, Unload
7
15
A
0.26
0.50
A
Ta 25C
1.0
2.1
A
Ta 85C
3.5
A
1.7
4.0
V
IBAT1
VBAT
2
VOUT
Ta 40C to 85C
IBAT2
1
0.93
RSW
∆VSW 1
∆Ta VSW 1
ISS1
RESET
VDS 16 V, VIN 16 V
ILEAK
Total
V
Ta 40C to 85C
VBAT switch leakage current
Remark
3.482
V
VBAT 3.0 V, VOUT voltage detection
Backup power supply input voltage
3.401
16
VSW2
Current consumption
3.319
CS output inhibit voltage
CS output inhibit voltage temperature
V
V
1.7
VBAT 2.8 V, VIN voltage detection
coefficient
16
3.366
VIN or VBAT
Vopr
VSW1
Switch voltage temperature coefficient
3.300
VDET1
Ta VDET1
Switch voltage
VBAT switch resistance
3.234
Test
Circuit
VIN Open, VBAT 3.0 V, Unload
7
The number in the Test Circuit column corresponds to the circuit number in the “Test Circuit” section.
9
BATTERY BACKUP SWITCHING IC
Rev.3.0_02
S-8424A Series
4. S-8424AADxx
Table 7
Voltage regulator
Parameter
Voltage detector
Conditions
Min.
Typ.
Max.
Unit
VRO
VIN 6 V, IRO 30 mA
4.900
5.000
5.100
V
Dropout voltage 1
Vdrop1
VIN 6 V, IRO 30 mA
356
474
mV
Load stability 1
VRO1
VIN 6 V, IRO 0.1 to 40 mA
50
100
mV
Input stability 1
VRO2
VIN 6 to 16 V, IRO 30 mA
5
20
mV
VRO
Ta VRO
Ta 40C to 85C
100
ppm/C
Output voltage 2
VOUT
VIN 6 V, IOUT 50 mA
4.900
5.000
5.100
V
Dropout voltage 2
Vdrop2
VIN 6 V, IOUT 50 mA
401
540
mV
Output voltage temperature coefficient 1
Load stability 2
VOUT1
VIN 6 V, IOUT 0.1 to 60 mA
50
100
mV
Input stability 2
VOUT2
VIN 6 to 16 V, IOUT 50 mA
5
20
mV
Ta 40C to 85C
100
ppm/C
Primary power input voltage
VOUT
Ta VOUT
VDET1
CS release voltage
VDET1
RESET detection voltage
VDET2
RESET release voltage
VDET2
PREEND detection voltage
VDET3
PREEND release voltage
VDET3
Operating voltage
Detection voltage temperature coefficient
Leakage current
VIN
CS detection voltage
Sink current
Switch unit
Symbol
Output voltage 1
Output voltage temperature coefficient 2
16
V
4.508
4.600
4.692
V
4.639
4.753
4.867
V
2.254
2.300
2.346
V
2.362
2.420
2.478
V
2.450
2.500
2.550
V
2.576
2.640
2.703
V
VIN voltage detection
VOUT voltage detection
VBAT voltage detection
VIN or VBAT
1.7
16
V
VDET1
Ta VDET1
Ta 40C to 85C
100
ppm/C
VDET 2
Ta VDET 2
Ta 40C to 85C
100
ppm/C
VDET 3
Ta VDET 3
Ta 40C to 85C
100
ppm/C
RESET
1.50
2.30
mA
PREEND
1.50
2.30
mA
CS
1.50
2.30
mA
0.1
A
VDET1
VDET1
VDET1
0.75
0.77
0.79
Vopr
ISINK
ILEAK
VDS 0.5 V, VIN VBAT 2.0 V
VDS 16 V, VIN 16 V
Switch voltage
VSW1
VBAT 2.8 V, VIN voltage detection
CS output inhibit voltage
VSW2
VBAT 3.0 V, VOUT voltage detection
VBAT switch leakage current
ILEAK
VIN 6 V, VBAT 0 V
VIN Open, VBAT 3.0 V, IOUT 10 to 500 A
VBAT switch resistance
Switch voltage temperature coefficient
CS output inhibit voltage temperature
coefficient
Current consumption
RSW
∆VSW 1
∆Ta VSW 1
∆VSW 2
∆Ta VSW 2
ISS1
Total
Remark
1
2
3
V
4
V
5
VOUT
VOUT
VOUT
0.95
0.97
0.1
A
6
30
60
7
Ta 40C to +85C
100
ppm/C
4
Ta 40C to +85C
100
ppm/C
5
VIN 6 V, VBAT 3.0 V, Unload
7
15
A
8
0.26
0.50
A
1.0
2.1
A
VIN Open, VBAT 3.0 V, Unload
Ta 25C
Ta 85C
VBAT
Test
Circuit
0.93
IBAT1
IBAT2
Backup power supply input voltage
10
Electrical Characteristics
(Unless otherwise specified: Ta 25C)
The number in the Test Circuit column corresponds to the circuit number in the “Test Circuit” section.
3.5
A
1.7
4.0
V
7
BATTERY BACKUP SWITCHING IC
S-8424A Series
Rev.3.0_02
5. S-8424AAExx
Table 8
Parameter
Voltage regulator
Conditions
Min.
Typ.
Max.
Unit
3.087
3.150
3.213
V
VIN 6 V, IRO 30 mA
Dropout voltage 1
Vdrop1
VIN 6 V, IRO 30 mA
356
474
mV
Load stability 1
VRO1
VIN 6 V, IRO 0.1 to 30 mA
50
100
mV
Input stability 1
VRO2
Output voltage temperature coefficient 1
Output voltage 2
VIN 6 to 16 V, IRO 30 mA
5
20
mV
VRO
Ta VRO
Ta 40C to 85C
100
ppm/C
VOUT
VIN 6 V, IOUT 50 mA
3.087
3.150
3.213
V
Vdrop2
VIN 6 V, IOUT 50 mA
401
540
mV
Load stability 2
VOUT1
VIN 6 V, IOUT 0.1 to 60 mA
50
100
mV
Input stability 2
VOUT2
VIN 6 to 16 V, IOUT 50 mA
5
20
mV
Ta 40C to 85C
100
ppm/C
Dropout voltage 2
Output voltage temperature coefficient 2
Primary power input voltage
Voltage detector
Symbol
VRO
Output voltage 1
VOUT
Ta VOUT
VDET1
CS release voltage
VDET1
RESET detection voltage
VDET2
RESET release voltage
VDET2
PREEND detection voltage
VDET3
PREEND release voltage
VDET3
Operating voltage
Detection voltage temperature coefficient
Leakage current
VIN
CS detection voltage
Sink current
Switch unit
Electrical Characteristics
(Unless otherwise specified: Ta 25C)
VIN voltage detection
VOUT voltage detection
VBAT voltage detection
2.254
2.300
2.346
V
2.362
2.420
2.478
V
2.450
2.500
2.550
V
2.576
2.640
2.703
V
100
ppm/C
VDET 2
Ta VDET 2
Ta 40C to 85C
100
ppm/C
VDET 3
Ta VDET 3
Ta 40C to 85C
100
ppm/C
RESET
1.50
2.30
mA
PREEND
1.50
2.30
mA
CS
1.50
2.30
mA
A
ISINK
ILEAK
VDS 0.5 V, VIN VBAT 2.0 V
VDS 16 V, VIN 16 V
ILEAK
RSW
∆VSW 1
∆Ta VSW 1
∆VSW 2
∆Ta VSW 2
ISS1
IBAT2
VBAT
0.1
VDET1
VDET1
VDET1
0.75
0.77
0.79
1
2
3
V
4
V
5
VOUT
VOUT
VOUT
0.93
0.95
0.97
VIN 6 V, VBAT 0 V
0.1
A
6
VIN Open, VBAT 3.0 V, IOUT 10 to 500 A
30
60
7
Ta 40C to +85C
100
ppm/C
4
Ta 40C to +85C
100
ppm/C
5
VIN 6 V, VBAT 3.0 V, Unload
7
15
A
8
0.26
0.50
A
Ta 25C
1.0
2.1
A
Ta 85C
3.5
A
1.7
4.0
V
IBAT1
Total
V
Ta 40C to 85C
VBAT switch leakage current
Remark
4.441
V
VBAT 3.0 V, VOUT voltage detection
Backup power supply input voltage
4.337
16
VSW2
Current consumption
4.233
CS output inhibit voltage
CS output inhibit voltage temperature
V
V
1.7
VBAT 2.8 V, VIN voltage detection
coefficient
16
4.284
VIN or VBAT
Vopr
VSW1
Switch voltage temperature coefficient
4.200
VDET1
Ta VDET1
Switch voltage
VBAT switch resistance
4.116
Test
Circuit
VIN Open, VBAT 3.0 V, Unload
7
The number in the Test Circuit column corresponds to the circuit number in the “Test Circuit” section.
11
BATTERY BACKUP SWITCHING IC
Rev.3.0_02
S-8424A Series
6. S-8424AAFxx
Table 9
Electrical Characteristics
(Unless otherwise specified: Ta 25C)
Voltage regulator
Parameter
Typ.
Max.
Unit
VRO
VIN 6 V, IRO 30 mA
3.136
3.200
3.264
V
Vdrop1
VIN 6 V, IRO 30 mA
356
474
mV
Load stability 1
VRO1
VIN 6 V, IRO 0.1 to 30 mA
50
100
mV
Input stability 1
VRO2
VIN 6 to 16 V, IRO 30 mA
5
20
mV
VRO
Ta VRO
Ta 40C to 85C
100
ppm/C
Output voltage 2
VOUT
VIN 6 V, IOUT 50 mA
3.136
3.200
3.264
V
Dropout voltage 2
Vdrop2
VIN 6 V, IOUT 50 mA
401
540
mV
Output voltage temperature coefficient 1
Load stability 2
VOUT1
VIN 6 V, IOUT 0.1 to 50 mA
50
100
mV
Input stability 2
VOUT2
VIN 6 to 16 V, IOUT 50 mA
5
20
mV
Ta 40C to 85C
100
ppm/C
VOUT
Ta VOUT
VDET1
CS release voltage
VDET1
RESET detection voltage
VDET2
RESET release voltage
VDET2
PREEND detection voltage
VDET3
PREEND release voltage
VDET3
Operating voltage
Detection voltage temperature coefficient
Leakage current
VIN
CS detection voltage
Sink current
16
V
4.312
4.400
4.488
V
4.436
4.545
4.654
V
2.352
2.400
2.448
V
2.467
2.528
2.589
V
2.548
2.600
2.652
V
2.682
2.748
2.814
V
VIN voltage detection
VOUT voltage detection
VBAT voltage detection
VIN or VBAT
1.7
16
V
VDET1
Ta VDET1
Ta 40C to 85C
100
ppm/C
VDET 2
Ta VDET 2
Ta 40C to 85C
100
ppm/C
VDET 3
Ta VDET 3
Ta 40C to 85C
100
ppm/C
RESET
1.50
2.30
mA
PREEND
1.50
2.30
mA
CS
1.50
2.30
mA
0.1
A
VDET1
VDET1
VDET1
0.75
0.77
0.79
Vopr
ISINK
ILEAK
VDS 0.5 V, VIN VBAT 2.0 V
VDS 16 V, VIN 16 V
Switch voltage
VSW1
VBAT 2.8 V, VIN voltage detection
CS output inhibit voltage
VSW2
VBAT 3.0 V, VOUT voltage detection
VBAT switch leakage current
ILEAK
VIN 6 V, VBAT 0 V
VBAT switch resistance
Switch voltage temperature coefficient
CS output inhibit voltage temperature
coefficient
Current consumption
Total
Remark
VOUT
VOUT
0.95
0.97
1
2
3
V
4
V
5
0.1
A
6
VIN Open, VBAT 3.0 V, IOUT 10 to 500 A
30
60
7
Ta 40C to 85C
100
ppm/C
4
∆VSW 2
∆Ta VSW 2
Ta 40C to 85C
100
ppm/C
5
VIN 6 V, VBAT 3.0 V, Unload
7
15
A
8
A
ISS1
IBAT2
Backup power supply input voltage
VOUT
0.93
Test
Circuit
RSW
∆VSW 1
∆Ta VSW 1
0.26
0.50
Ta 25C
1.0
2.1
A
Ta 85C
3.5
A
1.7
4.0
V
IBAT1
12
Min.
Dropout voltage 1
Primary power input voltage
Voltage detector
Conditions
Output voltage 1
Output voltage temperature coefficient 2
Switch unit
Symbol
VBAT
VIN Open, VBAT 3.0 V, Unload
The number in the Test Circuit column corresponds to the circuit number in the “Test Circuit” section.
7
BATTERY BACKUP SWITCHING IC
S-8424A Series
Rev.3.0_02
7. S-8424AAGxx
Table 10
Electrical Characteristics
(Unless otherwise specified: Ta 25C)
Parameter
Voltage regulator
Min.
Typ.
Max.
Unit
2.744
2.800
2.856
V
VIN 6 V, IRO 30 mA
Dropout voltage 1
Vdrop1
VIN 6 V, IRO 30 mA
356
474
mV
Load stability 1
VRO1
VIN 6 V, IRO 0.1 to 30 mA
50
100
mV
Input stability 1
VRO2
Output voltage temperature coefficient 1
Output voltage 2
VIN 6 to 16 V, IRO 30 mA
5
20
mV
VRO
Ta VRO
Ta 40C to 85C
100
ppm/C
VOUT
VIN 6 V, IOUT 50 mA
2.744
2.800
2.856
V
Vdrop2
VIN 6 V, IOUT 50 mA
401
540
mV
Load stability 2
VOUT1
VIN 6 V, IOUT 0.1 to 50 mA
50
100
mV
Input stability 2
VOUT2
VIN 6 to 16 V, IOUT 50 mA
5
20
mV
Ta 40C to 85C
100
ppm/C
Dropout voltage 2
Output voltage temperature coefficient 2
Primary power input voltage
Voltage detector
Conditions
VRO
Output voltage 1
VOUT
Ta VOUT
VDET1
CS release voltage
VDET1
detection voltage
VDET2
RESET release voltage
VDET2
PREEND detection voltage
VDET3
PREEND release voltage
VDET3
Operating voltage
Detection voltage temperature coefficient
16
V
4.312
4.400
4.488
V
4.436
4.545
4.654
V
VOUT voltage detection
2.352
2.400
2.448
V
2.467
2.528
2.589
V
VBAT voltage detection
2.548
2.600
2.652
V
VIN
CS detection voltage
Sink current
Switch unit
Symbol
VIN voltage detection
2.682
2.748
2.814
V
VIN or VBAT
1.7
16
V
VDET1
Ta VDET1
Ta 40C to 85C
100
ppm/C
VDET 2
Ta VDET 2
Ta 40C to 85C
100
ppm/C
VDET 3
Ta VDET 3
Ta 40C to 85C
100
ppm/C
RESET
1.50
2.30
mA
PREEND
1.50
2.30
mA
CS
1.50
2.30
mA
0.1
A
VDET1
VDET1
VDET1
0.75
0.77
0.79
Vopr
ISINK
VDS 0.5 V, VIN VBAT 2.0 V
Leakage current
ILEAK
VDS 16 V, VIN 16 V
Switch voltage
VSW1
VBAT 2.8 V, VIN voltage detection
CS output inhibit voltage
VSW2
VBAT 3.0 V, VOUT voltage detection
VBAT switch leakage current
ILEAK
VIN 6 V, VBAT 0 V
VBAT switch resistance
Switch voltage temperature coefficient
CS output inhibit voltage temperature
coefficient
Current consumption
Total
VOUT
0.97
2
3
V
4
V
5
0.1
A
6
VIN Open, VBAT 3.0 V, IOUT 10 to 500 A
30
60
7
Ta 40C to 85C
100
ppm/C
4
∆VSW 2
∆Ta VSW 2
Ta 40C to 85C
100
ppm/C
5
VIN 6 V, VBAT 3.0 V, Unload
7
15
A
8
0.26
0.50
A
Ta 25C
1.0
2.1
A
Ta 85C
3.5
A
1.7
4.0
V
ISS1
IBAT2
Remark
VOUT
0.95
1
RSW
∆VSW 1
∆Ta VSW 1
IBAT1
Backup power supply input voltage
VOUT
0.93
Test
Circuit
VBAT
VIN Open, VBAT 3.0 V, Unload
7
The number in the Test Circuit column corresponds to the circuit number in the “Test Circuit” section.
13
BATTERY BACKUP SWITCHING IC
Rev.3.0_02
S-8424A Series
8. S-8424AAHxx
Table 11
Electrical Characteristics
(Unless otherwise specified: Ta 25C)
Voltage regulator
Parameter
Typ.
Max.
Unit
VRO
VIN 6 V, IRO 30 mA
4.900
5.000
5.100
V
Vdrop1
VIN 6 V, IRO 30 mA
356
474
mV
Load stability 1
VRO1
VIN 6 V, IRO 0.1 to 40 mA
50
100
mV
Input stability 1
VRO2
VIN 6 to 16 V, IRO 30 mA
5
20
mV
VRO
Ta VRO
Ta 40C to 85C
100
ppm/C
Output voltage 2
VOUT
VIN 6 V, IOUT 50 mA
4.900
5.000
5.100
V
Dropout voltage 2
Vdrop2
VIN 6 V, IOUT 50 mA
401
540
mV
Output voltage temperature coefficient 1
Load stability 2
VOUT1
VIN 6 V, IOUT 0.1 to 60 mA
50
100
mV
Input stability 2
VOUT2
VIN 6 to 16 V, IOUT 50 mA
5
20
mV
Ta 40C to 85C
100
ppm/C
VOUT
Ta VOUT
VDET1
CS release voltage
VDET1
detection voltage
VDET2
RESET release voltage
VDET2
PREEND detection voltage
VDET3
PREEND release voltage
VDET3
Operating voltage
Detection voltage temperature coefficient
Leakage current
VIN
CS detection voltage
Sink current
VIN voltage detection
VOUT voltage detection
VBAT voltage detection
V
2.499
2.550
2.601
V
2.625
2.690
2.754
V
2.646
2.700
2.754
V
V
V
VDET1
Ta VDET1
Ta 40C to 85C
100
ppm/C
VDET 2
Ta VDET 2
Ta 40C to 85C
100
ppm/C
VDET 3
Ta VDET 3
Ta 40C to 85C
100
ppm/C
RESET
1.50
2.30
mA
PREEND
1.50
2.30
mA
CS
1.50
2.30
mA
A
ISINK
ILEAK
VDS 0.5 V, VIN VBAT 2.0 V
VDS 16 V, VIN 16 V
ILEAK
0.1
VDET1
VDET1
VDET1
0.75
0.77
0.79
Test
Circuit
1
2
3
V
4
V
5
VOUT
VOUT
VOUT
0.93
0.95
0.97
VIN 6 V, VBAT 0 V
0.1
A
6
RSW
∆VSW 1
∆Ta VSW 1
VIN Open, VBAT 3.0 V, IOUT 10 to 500 A
30
60
7
Ta 40C to 85C
100
ppm/C
4
∆VSW 2
∆Ta VSW 2
Ta 40C to 85C
100
ppm/C
5
VIN 6 V, VBAT 3.0 V, Unload
7
15
A
8
0.26
0.50
A
1.0
2.1
A
3.5
A
1.7
4.0
V
ISS1
IBAT1
Total
4.867
16
VBAT switch leakage current
IBAT2
VIN Open, VBAT 3.0 V, Unload
Ta 25C
Ta 85C
Remark
4.753
2.924
VBAT 3.0 V, VOUT voltage detection
Backup power supply input voltage
4.639
VSW2
Current consumption
V
V
2.856
CS output inhibit voltage
coefficient
16
4.692
1.7
VBAT 2.8 V, VIN voltage detection
Switch voltage temperature coefficient
4.600
2.787
VSW1
VBAT switch resistance
4.508
VIN or VBAT
Vopr
Switch voltage
CS output inhibit voltage temperature
14
Min.
Dropout voltage 1
Primary power input voltage
Voltage detector
Conditions
Output voltage 1
Output voltage temperature coefficient 2
Switch unit
Symbol
VBAT
The number in the Test Circuit column corresponds to the circuit number in the “Test Circuit” section.
7
BATTERY BACKUP SWITCHING IC
S-8424A Series
Rev.3.0_02
9. S-8424AAJFxx
Table 12
Electrical Characteristics
(Unless otherwise specified: Ta 25C)
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
Test
Circuit
VRO
VIN 6 V, IRO 10 mA
Dropout voltage 1
Vdrop1
Load stability 1
VRO1
Input stability 1
VRO2
Voltage regulator
Output voltage 1
Output voltage temperature coefficient 1
Output voltage 2
3.162
V
VIN 6 V, IRO 10 mA
123
167
mV
VIN 6 V, IRO 0.1 to 15 mA
50
100
mV
VIN 6 to 16 V, IRO 10 mA
5
20
mV
VRO
Ta VRO
Ta 40C to 85C
100
ppm/C
VOUT
VIN 6 V, IOUT 50 mA
3.038
3.100
3.162
V
Vdrop2
VIN 6 V, IOUT 50 mA
401
540
mV
VOUT1
VIN 6 V, IOUT 0.1 to 60 mA
50
100
mV
Input stability 2
VOUT2
VIN 6 to 16 V, IOUT 50 mA
5
20
mV
Ta 40C to 85C
100
ppm/C
Primary power input voltage
Voltage detector
3.100
Load stability 2
Dropout voltage 2
Output voltage temperature coefficient 2
VOUT
Ta VOUT
VDET1
CS release voltage
VDET1
RESET detection voltage
VDET2
RESET release voltage
VDET2
PREEND detection voltage
VDET3
PREEND release voltage
VDET3
Operating voltage
Detection voltage temperature coefficient
Leakage current
VIN
CS detection voltage
Sink current
Switch unit
3.038
VIN voltage detection
VOUT voltage detection
VBAT voltage detection
2.156
2.200
2.244
V
2.256
2.312
2.367
V
2.548
2.600
2.652
V
2.682
2.748
2.814
V
100
ppm/C
VDET 2
Ta VDET 2
Ta 40C to 85C
100
ppm/C
VDET 3
Ta VDET 3
Ta 40C to 85C
100
ppm/C
ISINK
ILEAK
VDS 0.5 V, VIN VBAT 2.0 V
RESET
1.50
2.30
mA
PREEND
1.50
2.30
mA
CS
1.50
2.30
mA
A
VDS 16 V, VIN 16 V
ILEAK
0.1
VDET1
VDET1
VDET1
0.75
0.77
0.79
2
3
V
4
V
5
VOUT
VOUT
VOUT
0.93
0.95
0.97
VIN 6 V, VBAT 0 V
0.1
A
6
RSW
∆VSW 1
∆Ta VSW 1
VIN Open, VBAT 3.0 V, IOUT 10 to 500 A
30
60
7
Ta 40C to 85C
100
ppm/C
4
∆VSW 2
∆Ta VSW 2
Ta 40C to 85C
100
ppm/C
5
VIN 6 V, VBAT 3.0 V, Unload
7
15
A
8
0.26
0.50
A
Ta 25C
1.0
2.1
A
Ta 85C
3.5
A
1.7
4.0
V
ISS1
IBAT1
Total
V
Ta 40C to 85C
VBAT switch leakage current
IBAT2
Remark
4.654
V
VBAT 3.0 V, VOUT voltage detection
Backup power supply input voltage
4.545
16
VSW2
Current consumption
4.436
CS output inhibit voltage
CS output inhibit voltage temperature
V
V
1.7
VBAT 2.8 V, VIN voltage detection
coefficient
16
4.488
VIN or VBAT
Vopr
VSW1
Switch voltage temperature coefficient
4.400
VDET1
Ta VDET1
Switch voltage
VBAT switch resistance
4.312
1
VBAT
VIN Open, VBAT 3.0 V, Unload
7
The number in the Test Circuit column corresponds to the circuit number in the “Test Circuit” section.
15
BATTERY BACKUP SWITCHING IC
Rev.3.0_02
S-8424A Series
10. S-8424AAKxx
Table 13
Electrical Characteristics
(Unless otherwise specified: Ta 25C)
Voltage regulator
Parameter
Voltage detector
Min.
Typ.
Max.
Unit
VRO
VIN 6 V, IRO 10 mA
3.136
3.200
3.264
V
Dropout voltage 1
Vdrop1
VIN 6 V, IRO 10 mA
123
167
mV
Load stability 1
VRO1
VIN 6 V, IRO 0.1 to 15 mA
50
100
mV
Input stability 1
VRO2
VIN 6 to 16 V, IRO 10 mA
5
20
mV
VRO
Ta VRO
Ta 40C to 85C
100
ppm/C
Output voltage 2
VOUT
VIN 6 V, IOUT 50 mA
3.136
3.200
3.264
V
Dropout voltage 2
Vdrop2
VIN 6 V, IOUT 50 mA
401
540
mV
Output voltage temperature coefficient 1
Load stability 2
VOUT1
VIN 6 V, IOUT 0.1 to 60 mA
50
100
mV
Input stability 2
VOUT2
VIN 6 to 16 V, IOUT 50 mA
5
20
mV
Ta 40C to 85C
100
ppm/C
VOUT
Ta VOUT
16
V
CS detection voltage
VDET1
VIN voltage detection
4.508
4.600
4.692
V
CS release voltage
VDET1
4.639
4.753
4.867
V
RESET detection voltage
VDET2
VOUT voltage detection
2.352
2.400
2.448
V
RESET release voltage
VDET2
2.467
2.528
2.589
V
Primary power input voltage
VIN
PREEND detection voltage
VDET3
VBAT voltage detection
2.548
2.600
2.652
V
PREEND release voltage
VDET3
2.682
2.748
2.814
V
Operating voltage
Detection voltage temperature coefficient
Sink current
Leakage current
Switch unit
Conditions
Output voltage 1
Output voltage temperature coefficient 2
VIN or VBAT
1.7
16
V
VDET1
Ta VDET1
Ta 40C to 85C
100
ppm/C
VDET 2
Ta VDET 2
Ta 40C to 85C
100
ppm/C
VDET 3
Ta VDET 3
Ta 40C to 85C
100
ppm/C
RESET
1.50
2.30
mA
PREEND
1.50
2.30
mA
CS
1.50
2.30
mA
0.1
A
VDET1
VDET1
VDET1
0.75
0.77
0.79
Vopr
ISINK
ILEAK
VDS 0.5 V, VIN VBAT 2.0 V
VDS 16 V, VIN 16 V
Switch voltage
VSW1
VBAT 2.8 V, VIN voltage detection
CS output inhibit voltage
VSW2
VBAT 3.0 V, VOUT voltage detection
VBAT switch leakage current
ILEAK
VIN 6 V, VBAT 0 V
VIN Open, VBAT 3.0 V, IOUT 10 to 500 A
Ta 40C to 85C
VBAT switch resistance
Switch voltage temperature coefficient
CS output inhibit voltage temperature
coefficient
Current consumption
RSW
∆VSW 1
∆Ta VSW 1
∆VSW 2
∆Ta VSW 2
ISS1
Total
IBAT2
Remark
1
2
3
V
4
V
5
VOUT
VOUT
VOUT
0.95
0.97
0.1
A
6
30
60
7
100
ppm/C
4
Ta 40C to 85C
100
ppm/C
5
VIN 6 V, VBAT 3.0 V, Unload
7
15
A
8
VIN Open, VBAT 3.0 V, Unload
Ta 25C
Ta 85C
VBAT
Test
Circuit
0.93
IBAT1
Backup power supply input voltage
16
Symbol
The number in the Test Circuit column corresponds to the circuit number in the “Test Circuit” section.
0.26
0.50
A
1.0
2.1
A
3.5
A
1.7
4.0
V
7
BATTERY BACKUP SWITCHING IC
S-8424A Series
Rev.3.0_02
Test Circuit
1.
2.
VBAT
VIN
V
VRO or VOUT
VIN
VSS
10 F
100 k
V
100 k
VBAT VOUT
VIN
PREEND
VIN
V
100 k
RESET
CS
VSS
V
V
V
To measure VDET3, apply 6 V to VIN.
3.
4.
VIN
VBAT VOUT CS
VIN
PREEND
VSS
VIN
A
A
RESET
VBAT
V
VIN
VBAT
VOUT
V
VSS
A
VDS
Measure the value after applying 6 V to VIN.
5.
6.
F.G.
VOUT
Oscilloscope
VBAT CS
100 k
Oscilloscope
VIN
VSS
VIN
VBAT
VIN
A
VSS
VBAT
7.
8.
VOUT
VIN
VBAT
VIN
VBAT
VIN
IOUT
VSS
VBAT
V
ISS
VIN
Leave open and measure the value after applying
6 V to VIN.
Figure 5
A
A IBAT
VSS
VBAT
To measure IBAT2, apply 6 V to VIN and then leave
VIN open and measure IBAT.
Test Circuit
17
BATTERY BACKUP SWITCHING IC
Rev.3.0_02
S-8424A Series
Operation Timing Chart
VIN (V)
VRO (V)
VOUT (V)
VBAT (V)
VCS (V)
VPREEND V
V RESET V
Remark
CS, PREEND and RESET are pulled up to VOUT. Y-axis is an arbitrary scale.
Figure 6
18
Operation Timing Chart
BATTERY BACKUP SWITCHING IC
S-8424A Series
Rev.3.0_02
Operation
The internal configuration of the S-8424A Series is as follows.
Voltage regulator 1, which stabilizes input voltage (VIN) and outputs it to VRO
Voltage regulator 2, which stabilizes input voltage (VIN) and outputs it to VOUT
CS voltage detector, which monitors input voltage (VIN)
PREEND voltage detector, which monitors output voltage (VBAT)
RESET voltage detector, which monitors output voltage (VOUT)
Switch unit
The functions and operations of the above-listed elements are described below.
1. Voltage Regulators
The S-8424A Series features on-chip voltage regulators with a small dropout voltage. The voltage of the VRO
and VOUT pins (the output pins of the voltage regulator) can separately be selected for the output voltage in
0.1 V steps between the range of 2.3 to 5.4 V.
[Dropout voltage Vdrop1, Vdrop2]
Assume that the voltage output from the VRO pin is VRO(E) under the conditions of output voltage 1
described in the electrical characteristics table. VIN1 is defined as the input voltage at which output voltage
from the VRO pin becomes 98% of VRO(E) when the input voltage VIN is decreased. Then, the dropout
voltage Vdrop1 is calculated by the following expression.
Vdrop1 VIN1 VRO(E) 0.98
Similarly, assume that the voltage of the VOUT pin is VOUT(E) under the conditions of output voltage 2
described in the electrical characteristics table. VIN2 is defined as the input voltage at which the output
voltage from the VOUT pin becomes 98% of VOUT(E). Then, the dropout voltage Vdrop2 is calculated by
the following expression.
Vdrop2 VIN2 VOUT(E) 0.98
2. Voltage Detector
The S-8424A Series incorporates three high-precision, low power consuming voltage detectors with
hysteresis characteristics. The power of the CS voltage detector is supplied from the VIN and VBAT pins.
Therefore, the output is stable as long as the primary or backup power supplies are within the operating
voltage range (1.7 to 16 V). All outputs are Nch open-drain, and need pull-up resistors of about 100 k.
2.1 CS Voltage Detector
The CS voltage detector monitors the input voltage VIN (VIN pin voltage). The detection voltage can be
selected from between 2.4 and 5.3 V in 0.1 V steps. The result of detection is output at the CS pin:
“Low” for lower voltage than the detection level and “High” for higher voltage than the release level
(however, when the VOUT pin voltage is the CS output inhibit voltage (VSW2), a low level is output).
Input voltage
Release voltage
Detection voltage
Output voltage
Figure 7
Definition of Detection and Release Voltages
19
BATTERY BACKUP SWITCHING IC
Rev.3.0_02
S-8424A Series
2.2 PREEND Voltage Detector
The PREEND voltage detector monitors the input voltage VBAT (VBAT pin voltage). The detection voltage
can be selected from between 1.7 V and 3.4 V in 0.1 V steps. A higher voltage can also be seclected
keeping a constant difference with the RESET voltage. This function enables the warning that the backup
battery is running out. The detection result is output to the PREEND pin: “Low” for lower voltages than
the detection voltage and “High” for higher voltages than the release voltage. The power supply of the
PREEND voltage detector is supplied from the VIN pin. The output is valid only when the voltage is
supplied from the VIN pin to the VOUT pin (VIN VSW1). The output is the low level when the voltage is
supplied from the VBAT pin to the VOUT pin (VIN < VSW1).
2.3 RESET Voltage Detector
The RESET voltage detector monitors the output voltage VOUT (VOUT pin voltage). The detection
voltage can be selected from between 1.7 V and 3.4 V in 0.1 V steps. The result of detection is output at
the RESET pin: “Low” for lower voltages than the detection level and “High” for higher voltages than
the release level. RESET outputs the normal logic if the VOUT pin voltage is 1.0 V or more.
Caution
The PREEND and RESET voltage detectors use the different pins, respectively.
Practically, the current is taken from the VBAT side, and consider the I/O voltage
difference (Vdif) of M1 when M1 is ON.
3. Switch Unit
The switch unit consists of the VSW1 and VSW2 detectors, a switch controller, voltage regulator 2, and switch
transistor M1 (Refer to “Figure 8 Switch Unit”).
VOUT
VIN
M1
VBAT
REG2
Switch
controller
Figure 8
VSW1
detector
VSW2
detector
Switch Unit
3.1 VSW1 Detector
The VSW1 detector monitors the power supply voltage VIN and sends the results of detection to the switch
controller. The detection voltage (VSW1) can be set to 77 2% or 85 2% of the CS release voltage
VDET1.
20
BATTERY BACKUP SWITCHING IC
S-8424A Series
Rev.3.0_02
3.2 VSW2 Detector
The VSW2 detector monitors the VOUT pin voltage and keeps the CS release voltage output low until the
VOUT pin voltage rises to VSW2 voltage. The CS pin output then changes from low to high if the VIN pin
voltage is more than the CS release voltage (VDET1) when the VOUT pin voltage rises to 95 2% of the
output voltage of voltage regulator 2 (VOUT). The CS pin output changes from high to low regardless of
the VSW2 voltage when the VIN pin voltage drops to less than the CS detection voltage (VDET1).
The CS pin output remains high if the VIN pin voltage stays higher than the CS detection voltage (VDET1)
when the VOUT pin voltage drops to less than the VSW2 voltage due to an undershoot.
3.3 Switch Controller
The switch controller controls voltage regulator 2 and switch transistor M1. There are two statuses
corresponding to the power supply voltage VIN (or power supply voltage VBAT) sequence: a special
sequence status and a normal sequence status. When the power supply voltage VIN rises and becomes
equal to or exceeds the CS release voltage (VDET1), the normal sequence status is entered, but until then
the special sequence status is maintained.
(1) Special sequence status
The switch controller sets voltage regulator 2 ON and switch transistor M1 OFF from the initial status
until the primary power supply voltage VIN is connected and reaches more than the CS release
voltage (VDET1) in order to prevent consumption of the backup power supply regardless of the VSW1
detector status. This status is called the special sequence status.
(2) Normal sequence status
The switch controller enters the normal sequence status from the special sequence status once the
primary power supply voltage VIN reaches more than the CS release voltage (VDET1).
Once the normal sequence is entered, the switch controller switches voltage regulator 2 and switch
transistor M1 ON/OFF as shown in Table 14 according to the power supply voltage VIN. The time
required for voltage regulator 2 to be switched from OFF to ON is a few hundred s at most. During
this interval, voltage regulator 2 and switch transistor M1 may both switch OFF and the VOUT pin
voltage may drop. To prevent this, connect a capacitor of 10 F or more to the VOUT pin.
When the VOUT pin voltage becomes lower than the RESET detection voltage, the status returns to
the special sequence status.
Table 14
ON/OFF Switching of Voltage Regulator 2 and
Switch Transistor M1 According to Power Supply Voltage (VIN)
Power Supply Voltage (VIN)
Voltage Regulator 2
Switch Transistor M1
VOUT Pin Voltage
VIN > VSW1
ON
OFF
VOUT
VIN < VSW1
OFF
ON
VBAT Vdif
21
BATTERY BACKUP SWITCHING IC
Rev.3.0_02
S-8424A Series
3.4 Switch Transistor M1
Voltage regulator 2 is also used to switch from VIN pin to VOUT pin. Therefore, no reverse current flows
from VOUT pin to VIN pin when voltage regulator 2 is OFF. The output voltage of voltage regulator 2 can
be selected from between 2.3 V and 5.4 V in 0.1 V steps.
The on-resistance of switch transistor M1 is 60 or lower (IOUT 10 to 500 A).
Therefore, when M1 is switched ON and VOUT pin is connected to VBAT pin, the voltage drop (Vdif)
caused by M1 is 60 IOUT (output current) at maximum., and VBAT – Vdif (max.) is output to the VOUT pin at
minimum.
When voltage regulator 2 is ON and M1 is OFF, the leakage current of M1 is kept below 0.1 A max. (VIN
6 V, Ta 25°C) with the VBAT pin grounded (VSS pin).
VOUT
Vdif
VIN
VBAT
REG2
M1
Figure 9 Definition of Vdif
22
BATTERY BACKUP SWITCHING IC
S-8424A Series
Rev.3.0_02
Transient Response
1. Line Transient Response Against Input Voltage Variation
The input voltage variation differs depending on whether the power supply input (0 V to 10 V square wave) is
applied or the power supply variation (6 V and 10 V square waves) is applied. This section describes the
ringing waveforms and parameter dependency of each type. The test circuit is shown for reference.
Power supply application: 0 V to 10 V Square wave
Fast amplifier
Input voltage
10 V
VIN
0V
VOUT
Oscilloscope
S-8424A
Series
COUT
VSS
RL
Overshoot
Undershoot
Output voltage
P.G.
Figure 11 Test Circuit
Figure 10 Power Supply Application:
0 V to 10 V Square Wave
Power Supply Application
VOUT pin
VRO pin
COUT 22 F, IOUT 50 mA, Ta 25C
CRO 22 F, IRO 30 mA, Ta 25C
10 V
Input Voltage
(5 V/div)
10 V
Input Voltage
(5 V/div)
0V
Output Voltage
(0.5 V/div)
Output Voltage
(0.5 V/div)
t (100 s/div)
t (100 s/div)
Figure 12
0V
Ringing Waveform of Power Supply
Application (VOUT Pin)
Figure 13
Ringing Waveform of Power Supply
Application (VRO Pin)
23
BATTERY BACKUP SWITCHING IC
Rev.3.0_02
S-8424A Series
Power supply variation: 6 V and 10 V square waves
Fast amplifier
10 V
Input
voltage
VOUT
VIN
S-8424A Series
6V
VSS
Output
Oscillo-scope
COUT
RL
Overshoot
P.G.
voltage
Undershoot
Figure 14 Power Supply Variation:
6 V and 10 V Square Waves
Figure 15 Test Circuit
Power Supply Variation
VOUT pin
COUT 22 F, IOUT 50 mA, Ta 25C
10 V
10 V
Input Voltage 6 V
(4 V/div)
6V
Output Voltage
(50 mV/div)
t (100 s/div)
Figure 16
Ringing Waveform of Power Supply Variation (VOUT Pin)
VRO pin
CRO 22 F, IRO 30 mA, Ta 25C
10 V
10 V
6V
Input Voltage 6 V
(4 V/div)
Output Voltage
(50 mV/div)
t (100 s/div)
Figure 17
24
Ringing Waveform of Power Supply Variation (VRO Pin)
BATTERY BACKUP SWITCHING IC
S-8424A Series
Rev.3.0_02
Reference data: Dependency of output current (IOUT), load capacitance (COUT), input variation width (VIN),
temperature (Ta)
For reference, the following pages describe the results of measuring the ringing amounts at the VOUT and
VRO pins using the output current (IOUT), load capacitance (COUT), input variation width (VIN), and
temperature (Ta) as parameters.
1.1 IOUT Dependency
(1) VOUT pin
(2) VRO pin
COUT 22 F, VIN 6 V and 10 V, Ta 25C
0.25
Ringing amount (V)
Ringing amount (V)
0.20
0.15
0.10
0.05
0.00
CRO 22 F, VIN 6 V and 10 V, Ta 25C
0.25
0
20
40
0.20
0.15
0.10
0.05
0.00
60
0
20
40
60
IRO (mA)
IOUT (mA)
1.2 COUT Dependency
(1) VOUT pin
(2) VRO pin
0.40
0.30
0.20
0.10
0.00
IRO 30 mA, VIN 6 V and 10 V, Ta 25C
0.50
Ringing amount (V)
Ringing amount (V)
IOUT 50 mA, VIN 6 V and 10 V, Ta 25C
0.50
0
10
20
30
COUT (F)
40
50
0.40
0.30
0.20
0.10
0.00
0
10
20
30
40
50
CRO (F)
Overshoot
Undershoot
25
BATTERY BACKUP SWITCHING IC
Rev.3.0_02
S-8424A Series
1.3 VIN Dependency
VIN shows the difference between the low voltage fixed to 6 V and the high voltage.
For example, VIN 2 V means the difference between 6 V and 8 V.
(1) VOUT pin
(2) VRO pin
0.30
IOUT50 mA, COUT22 F, Ta25C
0.30
0.25
Ringing amount (V)
Ringing amount (V)
0.25
IRO30 mA, CRO22 F, Ta25C
0.20
0.15
0.10
0.05
0.00
0
1
2
3
4
0.20
0.15
0.10
0.05
0.00
5
0
VIN (V)
1
2
3
4
5
VIN (V)
1.4 Temperature Dependency
(2) VRO pin
0.30
0.30
0.25
0.25
Ringing amount (V)
Ringing amount (V)
(1) VOUT pin
0.20
0.15
0.10
0.05
VIN6 10 V,
IOUT50 mA,
COUT22 F
0.20
0.15
0.10
0.05
0.00
VIN6 10 V,
IOUT30 mA,
CRO22 F
0.00
–50
0
50
Ta (C)
100
–50
0
50
100
Ta (C)
Overshoot
Undershoot
26
BATTERY BACKUP SWITCHING IC
S-8424A Series
Rev.3.0_02
2. Load Transient Response Based on Output Current Fluctuation
The overshoot and undershoot are caused in the output voltage if the output current fluctuates between 10 A and
50 mA (VRO is between 10 A and 30 mA) while the input voltage is constant. Figure 18 shows the output
voltage variation due to the output current. Figure 19 shows the test circuit for reference. The latter half of this
section describes ringing waveform and parameter dependency.
Output
current
50 mA
VIN
10 A
COUT
VSS
Overshoot
Oscilloscope
VOUT
S-8424A
Series
Undershoot
Output
current
Figure 18 Output Voltage Variation due to
Output Current
Figure 19 Test Circuit
Figure 20 shows the ringing waveforms at the VOUT pin and Figure 21 shows the ringing waveforms at the VRO
pin due to the load variation, respectively.
VOUT pin
VIN 6.0 V, COUT 22 F, Ta 25C
50 mA
Output current
50 mA
10 A
10 A
Output voltage
(50 mV/div)
t (50 s/div)
t (500 ms/div)
Figure 20 Ringing Waveform due to Load Variation (VOUT Pin)
VRO pin
VIN6.0 V, CRO22 F, Ta25C
30 mA
Output current
30 mA
10 A
10 A
Output voltage
(20 mV/div)
t (20 ms/div)
Figure 21
t (50 s/div)
Ringing Waveform due to Load Variation (VRO Pin)
27
BATTERY BACKUP SWITCHING IC
Rev.3.0_02
S-8424A Series
Reference data: Dependency of input voltage (VIN), load capacitance (COUT), output variation width (IOUT), and
temperature (Ta)
2.1 VIN Dependency
(1) VOUT pin
(2) VRO pin
CRO 22 F, IRO 30 mA and 10 A, Ta 25C
0.12
0.12
0.10
0.10
Ringing amount (V)
Ringing amount (V)
COUT 22 F, IOUT 50 mA and 10 A, Ta 25C
0.08
0.06
0.04
0.02
0.00
4
5
6
7
8
9 10
0.08
0.06
0.04
0.02
0.00
4
5
VIN (V)
6
7
8
9 10
VIN (V)
2.2 COUT Dependency
(2) VRO pin
VIN 6.0 V, IOUT 50 mA and 10 A, Ta 25C
0.60
VIN 6.0 V, IRO 30 mA and 10 A, Ta 25C
0.30
0.50
0.25
Ringing amount (V)
Ringing amount (V)
(1) VOUT pin
0.40
0.30
0.20
0.15
0.10
0.05
0.10
0.00
0.20
0
10
20
30
COUT (F)
40
50
0.00
0
10
20
30
40
50
CRO (F)
Overshoot
Undershoot
28
BATTERY BACKUP SWITCHING IC
S-8424A Series
Rev.3.0_02
2.3 IOUT Dependency
IOUT and IRO show the fluctuation between the low current stabilized at 10 A and the high current.
example, IOUT 10 mA means a fluctuation between 10 A and 10 mA.
(2) VRO pin
(1) VOUT pin
0.12
COUT 22 F, VIN 6 V, Ta 25C
Ringiing amount (V)
0.12
Ringing amount (V)
For
0.10
0.08
0.06
0.04
0.02
CRO22 F, VIN6.0 V, Ta25C
0.10
0.08
0.06
0.04
0.02
0.00
0
0.00
0
10 20 30 40 50 60
IRO (mA)
10 20 30 40 50 60
IOUT (mA)
2.4 Temperature Dependency
(1) VOUT pin
(2) VRO pin
VIN6.0 V, IOUT50 mA 10 A, COUT22 F
0.16
VIN6.0 V, IRO30 mA 10 A, CRO22 F
0.08
0.07
0.12
Ringing amount (V)
Ringing amount (V)
0.14
0.10
0.08
0.06
0.04
0.02
0.00
50
0.06
0.05
0.04
0.03
0.02
0.01
0
50
Ta (C)
100
0.00
50
0
50
100
Ta (C)
Overshoot
Undershoot
29
BATTERY BACKUP SWITCHING IC
Rev.3.0_02
S-8424A Series
Standard Circuit
VRO
1 k
VRO
VBAT
VIN
VOUT
6V
S-8424A
Series
10 F
10 F
VSS
10 F
0.1 F
3V
VOUT
100 k
RESET
CS
VOUT
PREEND
VOUT
VOUT
100 k
100 k
Figure 22
Standard Circuit
Caution 1. Be sure to add a 10 F or more capacitor to the VOUT and VRO pins.
2. The above connections and values will not guarantee correct operation. Before setting these
values, perform sufficient evaluation on the application to be actually used.
30
BATTERY BACKUP SWITCHING IC
S-8424A Series
Rev.3.0_02
Precautions
In applications with small IRO or IOUT, the output voltages VRO and VOUT may rise, causing the load stability to
exceed standard levels. Set IRO and IOUT to 10 A or more.
Attach the proper capacitor to the VOUT pin to prevent the RESET voltage detector (which monitors the VOUT
pin) from coming active due to undershoot.
Watch for overshoot and ensure it does not exceed the ratings of the IC chips and/or capacitors attached to the
VRO and VOUT pins.
Add a 10 F or more capacitor to the VOUT and VRO pins.
When VIN rises from the voltage more than VSW1, a low pulse of less than 4 ms flows through the PREEND pin
even when VBAT is more than the PREEND release voltage. Thus when monitoring the PREEND pin, make
sure to take the 4 ms interval or more after the rise of VIN.
Do not apply an electrostatic discharge to this IC that exceeds the performance ratings of the built-in
electrostatic protection circuit.
Application Circuits
1. When Using Timer Micro controllers for Backup to display PREEND in the primary CPU
100 k
VOUT
10 F
1 k
6V
3V
VIN
100 k
S-8424A
Series
VBAT
10 F
VCC
CS
CS
Timer
microcontroller
PREEND
0.1 F
RESET
VRO
10 F
RESET
VSS
100 k
VCC
RESET
Main CPU
INT
Address data
Figure 23
Application Circuit 1
31
BATTERY BACKUP SWITCHING IC
Rev.3.0_02
S-8424A Series
2. When Using Secondary Battery as Backup Battery
10 F
10 F
VRO
100 k
S-8424A
Series
10 F
6V
VCC
VOUT
VIN
VBAT
100 k
Microcontroller
INT
CS
0.1 F
RESET
3V
RESET
VSS
Figure 24
Remark
Application Circuit 2
The backup battery can be floating-recharged by using voltage regulator 1.
3. Memory Card
Card unit
VIN
VIN
VOUT
S-8424A
Series
10 F
100 k 100 k
BDT2
PREEND
BDT1
RESET
10 F
100 k
SRAM
CS
CS
VBAT
VSS
0.1 F
3V
CS
Figure 25
Caution
32
Application Circuit 3
The above connections and values will not guarantee correct operation. Before setting these
values, perform sufficient evaluation on the application to be actually used.
BATTERY BACKUP SWITCHING IC
S-8424A Series
Rev.3.0_02
Characteristics
1. Voltage Regulator Unit (VRO VOUT 3.0 V)
1.1 Input Voltage (VIN) vs. Output Voltage (VRO) Characteristics (REG1)
(1) Ta 85C
(2) Ta 25C
IRO 10 mA, 30 mA, 50 mA, 70 mA, 90 mA
IRO 10 mA, 30 mA, 50 mA, 70 mA, 90 mA
3.2
3.2
2.8
VRO (V)
VRO (V)
IRO 10 mA
IRO 90 mA
2.4
2.0
2.0
3.0
4.0
IRO 10 mA
2.8
IRO 90 mA
2.4
2.0
2.0
5.0
3.0
VIN (V)
4.0
5.0
VIN (V)
(3) Ta 40C
IRO 10 mA, 30 mA, 50 mA, 70 mA, 90 mA
VRO (V)
3.2
IRO 10 mA
2.8
IRO 90 mA
2.4
2.0
2.0
3.0
VIN (V)
4.0
5.0
1.2 Input Voltage (VIN) vs. Output Voltage (VOUT) Characteristics (REG2)
(1) Ta 85C
(2) Ta 25C
IOUT 10 mA, 30 mA, 50 mA, 70 mA, 90 mA
IOUT 10 mA, 30 mA, 50 mA, 70 mA, 90 mA
3.2
3.2
2.8
VOUT (V)
VOUT (V)
IOUT 10 mA
IOUT 90 mA
2.4
2.0
2.0
3.0
4.0
5.0
IOUT 10 mA
2.8
IOUT 90 mA
2.4
2.0
2.0
3.0
4.0
5.0
VIN (V)
VIN (V)
(3) Ta 40C
IOUT 10 mA, 30 mA, 50 mA, 70 mA, 90 mA
VOUT (V)
3.2
IOUT 10 mA
2.8
IOUT 90 mA
2.4
2.0
2.0
3.0
VIN (V)
4.0
5.0
33
BATTERY BACKUP SWITCHING IC
Rev.3.0_02
S-8424A Series
1.3 Output Current (IRO) vs. Dropout Voltage (Vdrop1) Characteristics
1.0
Ta 85C
25C
40C
1.0
0.8
Vdrop2 (V)
Vdrop1 (V)
0.8
1.4 Output Current (IOUT) vs. Dropout Voltage (Vdrop2) Characteristics
0.6
0.4
0.2
0.4
0.2
0.0
0.0
0
0.02
0.04
IRO (A)
0.06
1.5 Output Current (IRO) vs. Output Voltage (VRO) Characteristics
0
0.02
VRO (V)
VIN 6 V
2.85
1
Ta 40C
25C
85C
3.15
3.05
2.95
3.05
VIN 6 V
2.95
100
10 m
2.85
1
1
100
1.7 Output voltage (VRO) Temperature Characteristics
30
V IN 6 V, IRO 30 mA
VOUT (mV)
VRO (mV)
Based on VRO voltage when Ta is 25C
10
0
10
20
VIN 6 V, IOUT 50 mA
10
Based on VOUT voltage when Ta is 25C
0
10
20
20
30
40
20
0
20
40
60
80
40 20
100
0
1.9 Input Stability (VRO) Temperature Characteristics
40
60
80 100
1.10 Input Stability (VOUT) Temperature Characteristics
20
20
VOUT2 (mV)
VRO2 (mV)
20
Ta (C)
Ta (C)
15
10
5
15
10
5
0
0
40
20
0
20
40
60
80
40
100
20
0
Ta (C)
VOUT (mV)
20
10
0
0
20
Ta (C)
60
80
100
40
30
20
40
1.12 Load Stability (VRO) Temperature Characteristics
40
40
20
Ta (C)
1.11 Load Stability (VRO) Temperature Characteristics
VRO1 (mV)
1
1.8 Output voltage (VOUT) Temperature Characteristics
30
20
10 m
IRO (A)
IRO (A)
34
0.06
3.25
Ta 40C
25C
85C
3.15
30
0.04
IOUT (A)
1.6 Output Current (IOUT) vs. Output Voltage (VOUT) Characteristics
3.25
VOUT (V)
Ta 85C
25C
40C
0.6
40
60
80
100
30
20
10
0
40
20
0
20
Ta (C)
40
60
80
100
BATTERY BACKUP SWITCHING IC
S-8424A Series
Rev.3.0_02
2. Voltage Detector
2.1 CS Voltage Detector (VDET1 3.3 V)
(1) Detection voltage (VDET1) temperature
characteristics
(2) Output current (ISINK) characteristics
20
25
Based on CS (VDET1) voltage when Ta is 25C
CS ISINK (mA)
CS (mV)
10
30
0
10
Ta 25C
VIN 3 V
20
15
10
VIN 1.7 V
5
20
40
20
0
20
40
60
80
0
100
0.0
1.0
Ta (C)
2.0
3.0
4.0
VDS (V)
(3) Output current (ISINK) temperature characteristics
10
CS ISINK (mA)
8
VIN V BAT 2.0 V, V DS 0.5 V
6
4
2
0
40
20
0
20
40
Ta ( C)
60
80
100
2.2 RESET Voltage Detector (VDET2 2.2 V)
(1) Detection voltage (VDET2) temperature
characteristics
(2) Output current (ISINK) characteristics
20
30
10
25
when Ta is 25C
RESET ISINK (mA)
RESET (mV)
Based on RESET (VDET2) voltage
0
10
20
40
20
0
20
40
60
80
100
Ta ( C)
VIN 3 V
Ta 25C
20
15
10
VIN 1.7 V
5
0
0.0
1.0
2.0
3.0
4.0
VDS (V)
(3) Output current (ISINK) temperature characteristics
RESET ISINK (mA)
10
VIN VBAT 2.0 V, VDS 0.5 V
8
6
4
2
0
40
20
0
20
40
Ta (C)
60
80
100
35
BATTERY BACKUP SWITCHING IC
Rev.3.0_02
S-8424A Series
2.3 PREEND Voltage Detector (VDET3 2.6 V)
(2) Output current (ISINK) characteristics
(1) Detection voltage (VDET3) temperature
characteristics
30
Based on PREEND (VDET3) voltage
when Ta is 25C
10
25
PREEND ISINK (mA)
PREEND (mV)
20
0
10
20
40
20
0
20
40
60
80
100
VDS (V)
PREEND ISINK (mA)
10
VIN VBAT 2.0 V, V DS 0.5 V
6
4
2
0
40
20
0
20
Ta ( C)
36
40
20
15
10
VIN 1.7 V
5
0
0.0
1.0
2.0
VDS (V)
(3) Output current (ISINK) temperature characteristics
8
VIN 3 V
Ta 25 C
60
80
100
3.0
4.0
BATTERY BACKUP SWITCHING IC
S-8424A Series
Rev.3.0_02
3. Switch Unit
3.1 Switch Voltage (VSW1) Temperature
Characteristics
3.2 CS Output Inhibit Voltage (VSW2) Temperature
Characteristics
20
20
0
10
20
40
20
0
20
40
60
80
0
10
20
100
Ta (C)
3.3 Input Voltage (VBAT) vs. VBAT Switch
Resistance(RSW) Characteristics
RSW ()
RSW ()
50
30
20
10
0
20
0
20
Ta (C)
40
60
80
100
60
IOUT 500 A
40
40
3.4 VBAT Switch Resistance (RSW) Temperature
Characteristics
60
50
Based on VSW2 voltage when Ta is 25C
10
Based on V SW1 voltage when Ta is 25C
VSW2 (mV)
VSW1 (mV)
10
VBAT 3 V, IOUT 500 A
40
30
20
10
1
2
3
4
5
0
40
20
0
20
40
60
80
100
Ta (C)
VBAT (V)
3.5 VBAT Switch Leakage Current (ILEAK) Temperature
Characteristics
30
ILEAK (nA)
25
VIN 6.0 V, VBAT 0 V
20
15
10
5
0
40
20
0
20
40
60
80
100
Ta (C)
37
BATTERY BACKUP SWITCHING IC
Rev.3.0_02
S-8424A Series
4. Consumption Current
4.1 VIN vs. VIN Consumption Current (ISS1)
Characteristics
4.2 VBAT vs. VBAT2 Consumption Current (IBAT2)
Characteristics
16
2.0
Ta 85C
25C
40C
8
4
0
0
2
4
6
8
10
VIN (V)
12
14
16
2.4
2.8
3.2
3.6
4.0
VBAT (V)
(2) IBAT2
2.0
12
VIN 6.0 V, VBAT 3.0 V
1.5
IBAT2 (A)
ISS1 (A)
0.0
2.0
18
16
8
4
40
20
0
20
Ta (C)
38
1.0
0.5
4.3 Consumption Current Temperature
Characteristics
(1) ISS1
0
Ta 85C
25C
40C
1.5
IBAT2 (A)
ISS1 (A)
12
40
60
80
100
VIN open, VBAT 3.0 V
1.0
0.5
0.0
40
20
0
20
Ta (C)
40
60
80
100
+0.3
3.00 -0.2
8
5
1
4
0.17±0.05
0.2±0.1
0.65
No. FT008-A-P-SD-1.2
TITLE
TSSOP8-E-PKG Dimensions
No.
FT008-A-P-SD-1.2
ANGLE
UNIT
mm
ABLIC Inc.
4.0±0.1
2.0±0.05
ø1.55±0.05
0.3±0.05
+0.1
8.0±0.1
ø1.55 -0.05
(4.4)
+0.4
6.6 -0.2
1
8
4
5
Feed direction
No. FT008-E-C-SD-1.0
TITLE
TSSOP8-E-Carrier Tape
FT008-E-C-SD-1.0
No.
ANGLE
UNIT
mm
ABLIC Inc.
13.4±1.0
17.5±1.0
Enlarged drawing in the central part
ø21±0.8
2±0.5
ø13±0.5
No. FT008-E-R-SD-1.0
TITLE
TSSOP8-E-Reel
No.
FT008-E-R-SD-1.0
QTY.
ANGLE
UNIT
mm
ABLIC Inc.
3,000
13.4±1.0
17.5±1.0
Enlarged drawing in the central part
ø21±0.8
2±0.5
ø13±0.5
No. FT008-E-R-S1-1.0
TITLE
TSSOP8-E-Reel
FT008-E-R-S1-1.0
No.
QTY.
ANGLE
UNIT
mm
ABLIC Inc.
4,000
0.80±0.1
3.00±0.2
0.525typ.
(ø1.0)
(2.4)
+0.1
0.125 -0.05
0.65
+0.1
0.30 -0.05
No. PA008-B-P-SD-4.0
TITLE
SON8B-B-PKG Dimensions
PA008-B-P-SD-4.0
No.
ANGLE
UNIT
mm
ABLIC Inc.
8.0±0.1
4.0±0.1
2.0±0.05
3.4±0.1
4
1
5
8
1.2±0.1
ø1.55±0.05
ø1.55±0.05
0.3±0.05
Feed direction
No. PA008-B-C-SD-1.1
TITLE
SON8B-B-Carrier Tape
No.
PA008-B-C-SD-1.1
ANGLE
UNIT
mm
ABLIC Inc.
2±0.3
13.5±0.5
Enlarged drawing in the central part
ø13±0.2
No. PA008-B-R-SD-1.1
TITLE
SON8B-B-Reel
No.
PA008-B-R-SD-1.1
QTY.
ANGLE
UNIT
mm
ABLIC Inc.
3,000
Disclaimers (Handling Precautions)
1.
All the information described herein (product data, specifications, figures, tables, programs, algorithms and application
circuit examples, etc.) is current as of publishing date of this document and is subject to change without notice.
2.
The circuit examples and the usages described herein are for reference only, and do not guarantee the success of
any specific mass-production design.
ABLIC Inc. is not responsible for damages caused by the reasons other than the products described herein
(hereinafter "the products") or infringement of third-party intellectual property right and any other right due to the use
of the information described herein.
3.
ABLIC Inc. is not responsible for damages caused by the incorrect information described herein.
4.
Be careful to use the products within their specified ranges. Pay special attention to the absolute maximum ratings,
operation voltage range and electrical characteristics, etc.
ABLIC Inc. is not responsible for damages caused by failures and / or accidents, etc. that occur due to the use of the
products outside their specified ranges.
5.
When using the products, confirm their applications, and the laws and regulations of the region or country where they
are used and verify suitability, safety and other factors for the intended use.
6.
When exporting the products, comply with the Foreign Exchange and Foreign Trade Act and all other export-related
laws, and follow the required procedures.
7.
The products must not be used or provided (exported) for the purposes of the development of weapons of mass
destruction or military use. ABLIC Inc. is not responsible for any provision (export) to those whose purpose is to
develop, manufacture, use or store nuclear, biological or chemical weapons, missiles, or other military use.
8.
The products are not designed to be used as part of any device or equipment that may affect the human body, human
life, or assets (such as medical equipment, disaster prevention systems, security systems, combustion control
systems, infrastructure control systems, vehicle equipment, traffic systems, in-vehicle equipment, aviation equipment,
aerospace equipment, and nuclear-related equipment), excluding when specified for in-vehicle use or other uses. Do
not apply the products to the above listed devices and equipments without prior written permission by ABLIC Inc.
Especially, the products cannot be used for life support devices, devices implanted in the human body and devices
that directly affect human life, etc.
Prior consultation with our sales office is required when considering the above uses.
ABLIC Inc. is not responsible for damages caused by unauthorized or unspecified use of our products.
9.
Semiconductor products may fail or malfunction with some probability.
The user of the products should therefore take responsibility to give thorough consideration to safety design including
redundancy, fire spread prevention measures, and malfunction prevention to prevent accidents causing injury or
death, fires and social damage, etc. that may ensue from the products' failure or malfunction.
The entire system must be sufficiently evaluated and applied on customer's own responsibility.
10. The products are not designed to be radiation-proof. The necessary radiation measures should be taken in the
product design by the customer depending on the intended use.
11. The products do not affect human health under normal use. However, they contain chemical substances and heavy
metals and should therefore not be put in the mouth. The fracture surfaces of wafers and chips may be sharp. Be
careful when handling these with the bare hands to prevent injuries, etc.
12. When disposing of the products, comply with the laws and ordinances of the country or region where they are used.
13. The information described herein contains copyright information and know-how of ABLIC Inc.
The information described herein does not convey any license under any intellectual property rights or any other
rights belonging to ABLIC Inc. or a third party. Reproduction or copying of the information from this document or any
part of this document described herein for the purpose of disclosing it to a third-party without the express permission
of ABLIC Inc. is strictly prohibited.
14. For more details on the information described herein, contact our sales office.
2.2-2018.06
www.ablic.com