Philips Semiconductors

Product data

NE57606

2 to 4 cell redundant Lithium-ion overcharge monitor

2002 Oct 10

6

APPLICATION INFORMATION

The NE57606 can be used within 2, 3, or 4-cell battery packs. This

can be done by electrically creating a short-circuit across the pins

that would have been connected to the ends of the cells. For a 3-cell

pack pin VC1 should be connected to ground (pins 3 to 4). All of the

combinations are shown in Table 1.

Table 1.

Cells

VC1

VC2

VC3

VC4

4-cell

VC1

VC2

VC3

VC4

3-cell

VC1

VC1

VC2

VC3

2-cell

VC1

VC1

VC1

VC2

The schematics for a 3-cell and a 4-cell monitoring circuit are shown

in Figures 1 and 2 respectively.

C3

C2

C1

OVERVOLTAGE

FAULT (OPEN

COLLECTOR)

SL01560

NE57606

0.1

µF

1 k

Ω

0.1

µF

10 k

Ω

0.1

µF

10 k

Ω

100

Ω

V+

V–

0.1

µF

OUT

GND

1

23

4

5

6

7

8

0.22

µF

Figure 1. 3-cell monitoring circuit

SL01561

C4

C3

C2

OVERVOLTAGE

FAULT (OPEN

COLLECTOR)

0.1

µF

1 K

Ω

0.1

µF

10 K

Ω

0.1

µF

10 K

Ω

100

Ω

V+

V–

0.1

µF

OUT

GND

1

23

5

6

7

8

0.22

µF

C1

0.1

µF

10 K

Ω

4

NE57606

Figure 2. 4-cell monitoring circuit