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PDF S-8242B Data sheet ( Hoja de datos )
| Número de pieza | S-8242B | |
| Descripción | BATTERY PROTECTION IC | |
| Fabricantes | Seiko Instruments | |
| Logotipo |  |
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BATTERY PROTECTION IC
FOR 2-SERIAL-CELL PACK
S-8242B Series
The S-8242B Series are protection ICs for 2-serial-cell
lithium-ion/lithium polymer rechargeable batteries and
include high-accuracy voltage detectors and delay circuits.
These ICs are suitable for protecting 2-cell rechargeable
lithium-ion / lithium polymer battery packs from overcharge,
overdischarge, and overcurrent.
Features
(1) High-accuracy voltage detection for each cell
• Overcharge detection voltage n (n = 1, 2)
• Overcharge release voltage n (n = 1, 2)
3.9 V to 4.5 V (50 mV steps)
3.8 V to 4.5 V*1
Accuracy ±25 mV
Accuracy ±50 mV
• Overdischarge detection voltage n (n = 1, 2)
• Overdischarge release voltage n (n = 1, 2)
2.0 V to 3.0 V (100 mV steps)
2.0 V to 3.4 V*2
Accuracy ±50 mV
Accuracy ±100 mV
*1. Overcharge release voltage = Overcharge detection voltage − Overcharge hysteresis voltage
(Overcharge hysteresis voltage n (n = 1, 2) can be selected as 0 V or from a range of 0.1 V to
0.4 V in 50 mV steps.)
*2. Overdischarge release voltage = Overdischarge detection voltage + Overdischarge hysteresis voltage
(Overdischarge hysteresis voltage n (n = 1, 2) can be selected as 0 V or from a range of 0.1 V to
0.7 V in 100 mV steps.)
(2) Two-level overcurrent detection (overcurrent 1, overcurrent 2)
• Overcurrent detection voltage 1
0.05 V, 0.08 V to 0.30 V (10 mV steps)
Accuracy ±15 mV
• Overcurrent detection voltage 2
1.2 V (fixed)
Accuracy ±300 mV
(3) Delay times (overcharge, overdischarge, overcurrent) are generated by an internal circuit (external capacitors are
unnecessary).
(4) 0 V battery charge function available/unavailable are selectable.
(5) Charger detection function
• The overdischarge hysteresis is released by detecting negative voltage at the VM pin (−0.7 V typ.) (Charger
detection function).
(6) High-withstanding-voltage devices
Absolute maximum rating: 28 V
(7) Wide operating temperature range
−40°C to +85 °C
(8) Low current consumption
Operation mode
10 µA max. (+25°C)
Power-down mode
0.1 µA max. (+25°C)
(9) Small package
SNT-8A, 8-Pin TSSOP
(10) Lead-free products
Applications
• Lithium-ion rechargeable battery packs
• Lithium polymer rechargeable battery packs
Packages
Package Name
SNT-8A
8-Pin TSSOP
Package
PH008-A
FT008-A
Drawing Code
Tape
Reel
PH008-A
PH008-A
FT008-E
FT008-E
Land
PH008-A
Seiko Instruments Inc.
1
1 page  
www.DataSheet4U.com
Rev.1.4_00
BATTERY PROTECTION IC FOR 2-SERIAL-CELL PACK
S-8242B Series
Absolute Maximum Ratings
Table 5
Item Symbol
Input voltage between VDD and VSS
VC input pin voltage
VM pin input voltage
DO pin output voltage
CO pin output voltage
Power dissipation
SNT-8A
8-Pin TSSOP
VDS
VVC
VVM
VDO
VCO
PD
Operating ambient temperature
Topr
Storage temperature
Tstg
*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
Applied pin
VDD
VC
VM
DO
CO
(Ta=25°C unless otherwise specified)
Absolute Maximum Ratings
Unit
VSS−0.3 to VSS+12
VSS−0.3 to VDD+0.3
VDD−28 to VDD+0.3
VSS−0.3 to VDD+0.3
VVM−0.3 to VDD+0.3
450*1
700*1
V
V
V
V
V
mW
mW
−40 to +85
°C
−55 to +125
°C
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.
800
600
8-Pin TSSOP
400
200
SNT-8A
0
0 50 100 150
Ambient Temperature (Ta) [°C]
Figure 4 Power Dissipation of Package (When mounted on board)
Seiko Instruments Inc.
5
5 Page 
www.DataSheet4U.com
Rev.1.4_00
BATTERY PROTECTION IC FOR 2-SERIAL-CELL PACK
S-8242B Series
3. Overdischarge Status
When the battery voltage falls below overdischarge detection voltage n (VDLn) during discharging in the normal status
and detection continues for the overdischarge detection delay time (tDL) or longer, the S-8242B Series turns the
discharging control FET off to stop discharging. This condition is called the overdischarge status. When the
discharging control FET is turned off, the VM pin voltage is pulled up by the resistor between the VM and VDD pins in
the IC (RVMD). When the voltage difference between the VM and VDD pins then is 1.3 V (typ.) or lower, the current
consumption is reduced to the power-down current consumption (IPDN). This condition is called the power-down
status.
The power-down status is released when a charger is connected and the voltage difference between the VM and
VDD pins becomes 1.3 V (typ.) or higher. Moreover, when the battery voltage becomes overdischarge detection
voltage n (VDLn) or higher, the S-8242B Series turns the discharging FET on and returns to the normal status.
4. Charger Detection
When a battery in the overdischarge status is connected to a charger and provided that the VM pin voltage is lower
than the charger detection voltage (VCHA), the overdischarge hysteresis is released via the charge detection function;
therefore, the S-8242B Series releases the overdischarge status and turns the discharging control FET on when the
battery voltage becomes equal to or higher than overdischarge detection voltage n (VDLn) since the charger detection
function works. This action is called charger detection.
When a battery in the overdischarge status is connected to a charger and provided that the VM pin voltage is not
lower than the charger detection voltage (VCHA), the S-8242B Series releases the overdischarge status when the
battery voltage reaches overdischarge release voltage n (VDUn) or higher.
5. Overcurrent Status
When a battery in the normal status is in the status where the voltage of the VM pin is equal to or higher than the
overcurrent detection voltage because the discharge current is higher than the specified value and the status lasts for
the overcurrent detection delay time, the discharge control FET is turned off and discharging is stopped. This status
is called the overcurrent status.
In the overcurrent status, the VM and VSS pins are shorted by the resistor between VM and VSS (RVMS) in the IC.
However, the voltage of the VM pin is at the VDD potential due to the load as long as the load is connected. When the
load is disconnected, the VM pin returns to the VSS potential.
This IC detects the status when the impedance between the EB+ pin and EB− pin (Refer to Figure 13) increases and
is equal to the impedance that enables automatic restoration and the voltage at the VM pin returns to overcurrent
detection voltage 1 (VIOV1) or lower and the overcurrent status is restored to the normal status.
Caution The impedance that enables automatic restoration varies depending on the battery voltage and the
set value of overcurrent detection voltage 1.
Seiko Instruments Inc.
11
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