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PDF S-8242 Data sheet ( Hoja de datos )
| Número de pieza | S-8242 | |
| Descripción | BATTERY PROTECTION IC | |
| Fabricantes | Seiko Instruments | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de S-8242 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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Rev.1.0_00
BATTERY PROTECTION IC
FOR 2-SERIAL-CELL PACK
S-8242 Series
The S-8242 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 4.4 V (50 mV steps) Accuracy ±25 mV
3.8 V to 4.4 V*1
Accuracy ±50 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.)
• Overdischarge detection voltage n (n = 1, 2)
• Overdischarge release voltage n (n = 1, 2)
2.0 V to 3.0 V (100 mV steps) Accuracy ±50 mV
2.0 V to 3.4 V*2
Accuracy ±100 mV
*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 to 0.30 V (50 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 and abnormal charge current detection function
• The overdischarge hysteresis is released by detecting negative voltage at the VM pin (−0.7 V typ.).
(Charger detection function)
• When the output voltage of the DO pin is high and the voltage at the VM pin is equal to or lower than
the charger detection voltage (−0.7 V typ.), the output voltage of the CO pin goes low. (Abnormal
charge current 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
SOT-23-6W, 6-Pin SNB(B)
Applications
Package
• Lithium-ion rechargeable battery packs
• Lithium-polymer rechargeable battery packs
• SOT-23-6W (PKG drawing code: MP006-B)
• 6-Pin SNB(B) (PKG drawing code: BD006-A)
Seiko Instruments Inc.
1
1 page  
Rev.1.0_00
BATTERY PROTECTION IC FOR 2-SERIAL-CELL PACK
S-8242 Series
Absolute Maximum Ratings
Parameter
Input voltage between VDD and VSS*1
VC input pin voltage
VM pin input voltage
DO pin output voltage
CO pin output voltage
Power dissipation
Operating temperature range
Storage temperature range
Table 4
Symbol
VDS
VVC
VVM
VDO
VCO
PD
Topr
Tstg
Applicable Pins
VDD
VC
VM
DO
CO
(Ta = 25°C unless otherwise specified)
Absolute Maximum Rating 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
SOT-23-6W
300
V
mW
6-Pin SNB(B)
90
−40 to +85
°C
−55 to +125
*1. Even pulse (µs) noise exceeding the above input voltage (VSS + 12 V) may damage the IC, so do not
allow such noise to be applied.
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.
Seiko Instruments Inc.
5
5 Page 
Rev.1.0_00
BATTERY PROTECTION IC FOR 2-SERIAL-CELL PACK
S-8242 Series
Description of Operation
Remark Refer to Standard Circuit.
1. Normal status
This IC monitors the voltage of the battery connected between the VDD and VSS pins and the voltage
difference between the VM and VSS pins to control charging and discharging. When the battery voltage is
in the range from overdischarge detection voltage n (VDLn) to overcharge detection voltage n (VCUn), and the
VM pin voltage is in the range from the charger detection voltage (VCHA) to overcurrent detection voltage 1
(VIOV1), the IC turns both the charging and discharging control FETs on. This condition is called the normal
status, and in this condition charging and discharging can be carried out freely.
Caution When the battery is connected for the first time, discharging may not be enabled. In this
case, short the VM and VSS pins or connect the charger to restore the normal status.
2. Overcharge status
When the battery voltage becomes higher than overcharge detection voltage n (VCUn) during charging in the
normal status and detection continues for the overcharge detection delay time (tCU) or longer, the S-8242
Series turns the charging control FET off to stop charging. This condition is called the overcharge status.
The overcharge status is released in the following two cases (a and b).
a) When the battery voltage falls below overcharge release voltage n (VCLn), the S-8242 Series turns the
charging control FET on and returns to the normal status.
b) When a load is connected and discharging starts, the S-8242 Series turns the charging control FET
on and returns to the normal status. Just after the load is connected and discharging starts, the
discharging current flows through the parasitic diode in the charging control FET. At this moment the
VM pin potential becomes Vf, the voltage for the parasitic diode, higher than the VSS level. When the
battery voltage goes under overcharge detection voltage n (VCUn) and provided that the VM pin
voltage is higher than overcurrent detection voltage 1, the S-8242 Series releases the overcharge
condition.
Cautions 1. If the battery is charged to a voltage higher than overcharge detection voltage n
(VCUn) and the battery voltage does not fall below overcharge detection voltage n
(VCUn) even when a heavy load is connected, overcurrent 1 and overcurrent 2 do
not function until the battery voltage falls below overcharge detection voltage n
(VCUn). Since an actual battery has an internal impedance of tens of mΩ, the
battery voltage drops immediately after a heavy load that causes overcurrent is
connected, and overcurrent 1 and overcurrent 2 function.
2. When a charger is connected after overcharge detection, the overcharge status
is not released even if the battery voltage is below overcharge release voltage n
(VCLn). The overcharge status is released when the VM pin voltage goes over the
charger detection voltage (VCHA) by removing the charger.
Seiko Instruments Inc.
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet S-8242.PDF ] | |
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