The S-8245A/C Series is a protection IC for 3-serial to 5-serial cell lithium-ion rechargeable batteries, which includes high-accuracy voltage detection circuits and delay circuits. It is suitable for protecting 3-serial to 5-serial cell lithium-ion rechargeable battery packs from overcharge, overdischarge, and overcurrent. Cascade connection using the S-8245A/C Series realizes protecting 6-serial or more cells lithium-ion rechargeable battery packs.
Connecting an NTC, it allows for the temperature detection at four different points: high temperature detection during charging, low temperature detection during charging, high temperature detection during discharging, and low temperature detection during discharging.
- Reference-design
Integrated charge and discharge path circuits (S-8245A)： 6cell | 7cell | 8cell | 9cell | 10cell
Separate charge and discharge paths circuits (S-8245C)： 6cell | 7cell | 8cell | 9cell | 10cell
Features
- High-accuracy voltage detection for each cell
- Overcharge detection voltage n (n = 1 to 5): 3.550 V to 4.600 V (50 mV step) Accuracy ±20 mV
- Overcharge release voltage n (n = 1 to 5): 3.150 V to 4.600 V*1 Accuracy ±50 mV
- Overdischarge detection voltage n (n = 1 to 5): 2.000 V to 3.200 V (100 mV step) Accuracy ±80 mV
- Overdischarge release voltage n (n = 1 to 5): 2.000 V to 3.400 V*2 Accuracy ±100 mV
- Three-level discharge overcurrent detection
- Discharge overcurrent 1 detection voltage: 0.020 V to 0.300 V (10 mV step) Accuracy ±10 mV
- Discharge overcurrent 2 detection voltage: 0.040 V to 0.500 V (20 mV step) Accuracy ±15 mV
- Load short-circuiting detection voltage: 0.100 V to 1.000 V (25 mV step) Accuracy ±50 mV
- Charge overcurrent detection
- Charge overcurrent detection voltage: −0.300 V to −0.020 V (10 mV step) Accuracy ±10 mV
- Each delay time is settable by an external capacitor
- (Load short-circuiting detection delay time and temperature detection delay time are internally fixed)
- Independent control of charge inhibition, discharge inhibition, and power-saving by each control pin
- 0 V battery charge function is selectable
- Available, unavailable
- Power-down function is selectable
- Available, unavailable
- CIT pin internal resistance value is selectable
- 831 kΩ typ., 8.31 MΩ typ.
- CO and DO pin output voltage is limited to 15 V max. respectively
- Switching control for 3-serial to 5-serial cell is possible by inputting voltage to the SEL1 pin and the SEL2 pin
- Protection of 6-serial or more cells is possible by cascade connection
- Temperature detection is possible at four different points by connecting an NTC
- High temperature detection ratio during charging / discharging: 0.600 to 0.900 (0.005 step) Accuracy ±0.005
- Low temperature detection ratio during charging / discharging: 0.030 to 0.400 (0.005 step) Accuracy ±0.005
- High-withstand voltage
- Absolute maximum rating 28 V
- Wide operation voltage range
- 5 V to 24 V
- Wide operation temperature range
- Ta = −40°C to +85°C
- Low current consumption
- During operation: 20 μA max. (Ta = +25°C)
- During power-down: 0.5 μA max. (Ta = +25°C)
- During power-saving: 0.1 μA max. (Ta = +25°C)
- Lead-free (Sn 100%), halogen-free
*1. Overcharge release voltage = Overcharge detection voltage − Overcharge hysteresis voltage
(Overcharge hysteresis voltage n (n = 1 to 5) is selectable in 0 V to 0.4 V in 50 mV step)
*2. Overdischarge release voltage = Overdischarge detection voltage + Overdischarge hysteresis voltage
(Overdischarge hysteresis voltage n (n = 1 to 5) is selectable in 0 V to 0.7 V in 100 mV step)
Applications
- Lithium-ion rechargeable battery pack