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S-8261ACAMD-G4AT2G

BATTERY PROTECTION IC FOR 1-CELL PACK

Seiko Instruments Inc 

BATTERY PROTECTION IC FOR 1-CELL PACK

S-8261 Series

Rev.5.3_00

7. Delay Circuit

The detection delay times are determined by dividing a clock of the approximately 3.5 kHz with the counter.

Remark 1. The detection delay time for overcurrent 2 (tIOV2) and load short-circuiting (tSHORT) start when the

overcurrent 1 (VIOV1) is detected. When the overcurrent 2 (VIOV2) or load short-circuiting (VSHORT) is

detected over the detection delay time for each of them (= tIOV2 or tSHORT) after the detection of

overcurrent 1 (VIOV1), the S-8261 Series turns the FET off within tIOV2 or tSHORT of each detection.

VDD

DO pin

VSS

Overcurrent 2 detection delay time (tIOV2)

VDD

VM pin

VIOV2

VIOV1

VSS

Figure 5

tD

0 ≤ tD ≤ tIOV2

Time

Time

2. With power-down function

When the overcurrent is detected and continues for longer than the overdischarge detection delay time

(tDL) without releasing the load, the status changes to the power-down status when the battery voltage

falls below the overdischarge detection voltage (VDL). When the battery voltage falls below the

overdischarge detection voltage (VDL) due to the overcurrent, the S-8261 Series turns the discharging

control FET off by the overcurrent detection. In this case if the recovery of the battery voltage is so slow

that the battery voltage after the overdischarge detection delay time (tDL) is still lower than the

overdischarge detection voltage (VDL), the S-8261 Series shifts to the power-down status.

Without power-down function

When the overcurrent is detected and continues for longer than the overdischarge detection delay time

(tDL) without released the load, the status changes to the overdischarge status when the battery voltage

falls below overdischarge detection voltage (VDL).When the battery voltage falls below overdischarge

detection voltage (VDL) due to the overcurrent, the S-8261 Series turns the discharging control FET off by

the overcurrent detection. In this case, if the recovery of the battery voltage is so slow that the battery

voltage after the overdischarge detection delay time (tDL) is still lower than the overdischarge detection

voltage (VDL), the S-8261 Series shifts to the overdischarge status.

20

Seiko Instruments Inc.

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