BATTERY PROTECTION IC FOR 1-CELL PACK

S-82K1B Series

21



Battery Protection IC Connection Example

DO

CO

VM

FET1

FET2

R2

VSS

VINI

R3

Battery C1

R1

VDD

S-82K1B Series

EB

−

EB

+

Figure 12

Table 11 Constants for External Components

Symbol

Part

Purpose

Min.

Typ.

Max.

Remark

FET1

N-channel

MOS FET

Discharge control

−

−

−

Threshold voltage

≤ Overdischarge

FET2

N-channel

MOS FET

Charge control

−

−

−

Threshold voltage

≤ Overdischarge

R1

Resistor

ESD protection,

For power fluctuation

270

Ω

330

Ω

1.2 k

−

C1

Capacitor

For power fluctuation

0.068

μF 0.1 μF

2.2

μF

−

R2

Resistor

ESD protection,

Protection for reverse

connection of a charger

300

Ω

470

Ω

1.5 k

Ω

−

R3

Resistor

Overcurrent detection

−

1.5 m

Ω

−

−

*1. If a FET with a threshold voltage equal to or higher than the overdischarge detection voltage is used, discharging may be

stopped before overdischarge is detected.

*2. Accuracy of overcharge detection voltage is guaranteed by R1 = 330

Ω. Connecting resistors with other values will

worsen the accuracy.

Caution 1. The constants may be changed without notice.

2. It has not been confirmed whether the operation is normal or not in circuits other than the connection

example. In addition, the connection example and the constants do not guarantee proper operation.

Perform thorough evaluation using the actual application to set the constants.