Philips Semiconductors

Product data

NE57606

2 to 4 cell redundant Lithium-ion overcharge monitor

2002 Oct 10

8

SL01862

C4

C3

C2

0.1

µF

1 k

Ω

0.1

µF

10 k

Ω

0.1

µF

10 k

Ω

100

Ω

0.1

µF

OUT

GND

1

23

5

6

7

8

0.22

µF

C1

0.1

µF

10 k

Ω

4

DISCHARGE

FET

CHARGE

FET

47 k

Ω

10 k

Ω

10 k

Ω

V+

330

Ω

CS

CF

910 k

Ω

NE57605

V–

CON

GND

0.1

µF

0.1

µF

1 k

Ω

0.1

µF

1 k

Ω

0.1

µF

1 k

Ω

SYSTEM GROUND

0.1

µF

330

Ω

NE57606

SEL

1

7

9

8

13

10

15

16

17

18

11

20

5

3

REDUNDANT

CHARGE

FET

10 k

Ω

10 k

Ω

910 k

Ω

CHARGE SHUTDOWN

Figure 4. Double-redundantly protected 4-cell Li-ion battery pack (completely redundant system)

The circuit in Figure 4 shows how to implement a completely

isolated design. None of the components are shared and a failure in

any part of one circuit will not affect the operation of the other. By

also not sharing input noise filter components, the failure of the IC

due to an input failure or an open circuit will not affect the protection

provided by the other circuit.