S-8254AABFT-TB 4.25V TSSOP-16 Battery Management ICs ABLIC/SEIKO

S-8254AABFT-TB Electronic Integrated Circuits Lithium-ion rechargeable battery packs  Lithium polymer rechargeable battery packs

1.The S-8254A Series is a protection IC for 3-serial- or 4-serial-cell lithium-ion / lithium polymer rechargeable batteries and includes a high-accuracy voltage detector and delay circuit. The S-8254A Series protects both 3-serial or 4-serial cells using the SEL pin for switching.

2.Features

1)High-accuracy voltage detection for each cell
• Overcharge detection voltage n (n = 1 to 4) 3.90 V to 4.45 V (50 mV step) Accuracy ±25 mV
• Overcharge release voltage n (n = 1 to 4) 3.80 V to 4.45 V*1Accuracy ±50 mV
• Overdischarge detection voltage n (n = 1 to 4) 2.0 V to 3.0 V (100 mV step) Accuracy ±80 mV
• Overdischarge release voltage n (n = 1 to 4) 2.0 V to 3.4 V*2Accuracy ±100 mV
(2) Three-level overcurrent protection
• Overcurrent detection voltage 1 0.05 V to 0.30 V (50 mV step) Accuracy ±25 mV
• Overcurrent detection voltage 2 0.5 V Accuracy ±100 mV
• Overcurrent detection voltage 3 VVC1− 1.2 V Accuracy ±300 mV (3) Delay times for overcharge detection, overdischarge detection and overcurrent detection 1 can be set by external capacitors (delay times for overcurrent detection 2 and 3 are fixed internally).
(4) Switchable between a 3-serial cell and 4-serial cell using the SEL pin
(5) Charge/discharge operation can be controlled via the control pins.
(6) 0 V battery charge Enabled, inhibited
(7) Power-down function Available
(8) High-withstand voltage Absolute maximum rating : 26 V
(9) Wide operating voltage range 2 V to 24 V
(10) Wide operating temperature range −40°C to + 85°C
(11) Low current consumption • During operation 30 μA max. (+25°C) • During power-down 0.1 μA max. (+25°C)
(12) Lead-free, Sn100%, halogen-free*3

3.1. Overcharge hysteresis voltage n (n = 1 to 4) can be selected as 0 V or from a range of 0.1 V to 0.4 V in 50 mV steps. (Overcharge hysteresis voltage = Overcharge detection voltage − Overcharge release voltage)
2. Overdischarge hysteresis voltage n (n = 1 to 4) can be selected as 0 V or from a range of 0.2 V to 0.7 V in 100 mV steps. (Overdischarge hysteresis voltage = Overdischarge release voltage − Overdischarge detection voltage)

4. Applications

Lithium-ion rechargeable battery packs
Lithium polymer rechargeable battery packs

5.Block Diagram

6.Product Name Structure

7.Pin Configuration

1 COP FET gate connection pin for charge control (Nch open drain output)
2 VMP Pin for voltage detection between VC1 and VMP (Pin for overcurrent 3 detection)
3 DOP FET gate connection pin for discharge control FET (CMOS output)
4 VINI Pin for voltage detection between VSS and VINI (Pin for overcurrent detection 1,2
5 CDT Capacitor connection pin for delay for overdischarge detection, delay for overcurrent detection 1
6 CCT Capacitor connection pin for delay for overcharge current
7 VSS Input pin for negative power supply, Connection pin for battery 4’s negative voltage
8 NC *1 No connection
9 NC *1 No connection
10 SEL Pin for switching 3-series or 4-series cell VSS level: 3-series cell, VDD level : 4-series cell
11 CTL Control of charge FET and discharge FET
12 VC4 Connection pin for battery 3’s negative voltage, Connection pin for battery 4’s positive voltage
13 VC3 Connection pin for battery 2’s negative voltage, Connection pin for battery 3’s positive voltage
14 VC2 Connection pin for battery 1’s negative voltage, Connection pin for battery 2’s positive voltage
15 VC1 Connection pin for battery 1’s positive voltage
16 VDD Input pin for positive power supply, Connection pin for battery 1’s positive voltage

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