3

LTC1731-4.1/LTC1731-4.2

Note 1: Absolute Maximum Ratings are those values beyond which the life

of a device may be impaired.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Automatic Shutdown Threshold Voltage

30

54

90

mV

40

69

100

mV

Voltage Mode Disable Threshold Voltage

q

0.4

V

PROG Pin Current

2.5

µA

PROG Pin Load Regulation

PROG Pin Source Current,

q

300

µA

PROG Pin Voltage

2.457

V

CHRG Pin Weak Pull-Down Current

50

100

150

µA

CHRG Pin Output Low Voltage

0.6

1.2

V

End of Charge Indication Current Level

q

25

50

100

mA

TIMER Accuracy

%

DRV Pin Clamp Voltage

6.5

V

ELECTRICAL CHARACTERISTICS

Note 2: The LTC1731E is guaranteed to meet performance specifications

from 0

°C to 70°C. Specifications over the –40°C to 85°C operating

temperature range are assured by design, characterization and correlation

with statistical process controls. Guaranteed I grade parts are available,

consult factory.

TYPICAL PERFOR A CE CHARACTERISTICS

Trickle Charge Current

vs Input Supply

4

50

55

12

1731 G01

45

40

6

8

10

60

TEMPERATURE (

°C)

–50 –25

25

2.460

2.465

150

1731 G02

2.455

2.450

0

50

75

100 125

2.470

TEMPERATURE (

°C)

–50 –25

25

100

105

150

1731 G03

95

90

0

50

75

100 125

110

Program Pin Voltage

vs Temperature

Timer Accuracy vs Temperature