SM6780AS

NIPPON PRECISION CIRCUITS—10

Charging Operating Status

TYPICAL APPLICATION CIRCUIT

Note that the above circuit is an example circuit to demonstrate the connections for device functions. Battery

charger operation is not guaranteed.

Charging status

Conditions

Charging mode

LEDN output

Internal timer

INH

Battery

check OK

Quick charge

LOW

Yes

Quick charge

High impedance

LOW (ON)

Count

Quick charge hold

LOW

No

Pulse trickle

13.68Hz, 3.91% duty

1Hz (pulsing)

Count

Quick charge inhibit

HIGH

–

Pulse trickle

13.68Hz, 3.91% duty

Same condition as

when INH went HIGH

Hold

Supplemental charge

LOW

OK

Supplemental

218Hz, 6.25% duty

High impedance (OFF)

Count

Supplemental charge inhibit

HIGH

OK

Pulse trickle

13.68Hz, 3.91% duty

High impedance (OFF)

Hold

Pulse trickle

–

–

Pulse trickle

13.68Hz, 3.91% duty

High impedance (OFF)

–

Standby

–

–

–

High impedance

High impedance (OFF)

Reset

1. Frequency and duty are typical values.

TEMP

BATT

CHGN

VSS

LEDN

INH

VDD

TIME

6

2

1

4

8

7

5

3

R6

33k

Ω

R7

100k

Ω

Q3

2SC945

SW2

IN

VSS

OUT

78L05

5V

Q2

2SD525

R2

4/5W

Q1

2SC945

R1

5.1k

Ω

External current source

R8

100k

Ω

R9

200k

Ω

R10

200k

Ω

R13

14k

Ω

R12

12k

Ω

SM6780AS

R5

1.8k

Ω

R3

100k

Ω

R4

100k

Ω

SW1

R11

640

Ω

5

=

5

− 0.65

4

= N

− 1

N= Number of cells

NTC

R:10k

Ω

(at 25 C)

B:3435K