LTC4079

4

4079f

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

NTC Temp Monitor

Low Temp. Fault NTC Threshold Voltage

l

72.3

73.8

75.3

%

High Temp. Fault NTC Threshold Voltage

l

35.6

36.6

37.6

%

NTC Disable Voltage Threshold

l

60

80

100

mV

Pulsed NTCBIAS Voltage

20k from NTCBIAS to Ground

4

V

NTCBIAS Period

3

Sec

NTCBIAS Pulse Width

210

µs

NTC Input Leakage Current

l

0.1

100

nA

Enable Input (EN)

Shutdown Threshold

Hysteresis

l

0.400

0.750

55

1.100

V

mV

Enable Pin Regulation Voltage

l

1.170

1.190

1.210

V

l

0

20

nA

Status Outputs (CHRG)

Output Low Voltage

1mA Into the Open-Drain Output

l

0.16

0.4

V

Output Leakage Current

l

0.1

100

nA

elecTrical characTerisTics

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: Unless otherwise specified, current into a pin is positive and

current out of a pin is negative.

Note 3: The LTC4079 is tested under pulsed load conditions such that

from 0°C to 125°C junction temperature. Specifications over the –40°C

to 125°C operating junction temperature range are assured by design,

characterization and correlation with statistical process controls. The

LTC4079I is guaranteed over the full –40°C to 125°C operating junction

temperature range. Note that the maximum ambient temperature

consistent with these specifications is determined by specific operating

conditions in conjunction with board layout, the rated package thermal

impedance and other environmental factors.

Note 4: BAT pin charge current, PROG pin and feedback divider currents

are excluded from supply quiescent current.

Note 5: Charge current is reduced by thermal regulation as the junction