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SC1766

BATTERY CHARGE CONTROLLER

Semtech Corporation 

BATTERY

CHARGE CONTROLLER

SC1766

Janaury 30, 1998

ELECTRICAL CHARACTERISTICS

Unless otherwise specified, TA = 25ºC, VIN = 12.5V

Parameter

Supply Voltage

Supply Current

-∆V detection level w.r.t. peak value

Voltage protection limits

battery low

battery high

Input impedance of TIMER pin

Input impedance of MODE pin

Output resistance of LED pin

fast charge

trickle charge

Symbol

VDD

IDD

VBT

ZTIMER

ZMODE

RLED

Min

9

0.50

3.30

100

100

1

Output resistance of VOUT pin

fast charge

trickle charge

RVOUT

1

FLASH pin output

resistance at fast charge

frequency

duty cycle

Reference voltage

source current

Temperature fault voltage limits as

fraction of VREF

under-temperature

over-temperature

RFLASH

VREF

αNTCL

1.5

0.60

0.15

Typ

-0.25

0.65

3.70

25

25

25

1

50

5.85

0.70

0.20

Max

18

1.5

0.80

3.90

0.80

0.25

Units

V

mA

%

V

kΩ

kΩ

MΩ

Ω

Ω

MΩ

Ω

Hz

%

V

mA

VREF

PIN CONFIGURATIONS

PIN DESCRIPTIONS

VDD Supply voltage input.

GND Ground.

VBT Input, to sense battery voltage.

MODE Input, to set IC operation mode.

TIMER Input, for safety timer control.

© 1997 SEMTECH CORP.

VREF Voltage reference output.

LED Output, for LED indicator.

VOUT Output, for LED indicator.

FLASH Output, for LED indicator (14-pin only.)

VNTC Input, for temperature protection (14 pin only).

652 MITCHELL ROAD NEWBURY PARK CA 91320

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