Datasheet

LTC4095
3
4095fa
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: The LTC4095 is guaranteed to meet performance specifi cations
from 0°C to 85°C. Specifi cations over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specifi ed maximum operating junction
temperature may impair device reliability.
ELECTRICAL CHARACTERISTICS
The ● denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. IN = HPWR = 5V, BAT = 3.8V, NTC = SUSP = 0V, R
PROG
= 1.74k unless
otherwise specifi ed.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
t
RECHRG
Recharge Comparator Filter Time BAT Falling 1.7 ms
t
TERM
Safety Timer Termination Period BAT = V
FLOAT
3.5 4 4.5 Hour
t
BADBAT
Bad-Battery Termination Time BAT < V
TRKL
0.4375 0.5 0.5625 Hour
h
C/10
End of Charge Indication Current Level (Note 5) 0.09 0.1 0.11 mA/mA
t
C/10
End of Charge Comparator Filter Time I
BAT
Falling 2.2 ms
R
ON_CHG
Battery Charger Power FET On-
Resistance (Between IN and BAT)
I
BAT
= 200mA 500 mΩ
T
LIM
Junction Temperature in Constant
Temperature
115 °C
NTC
V
COLD
Cold Temperature Fault Threshold
Voltage
Rising NTC Voltage
Hysteresis
0.750 • IN 0.765 • IN
0.016 • IN
0.780 • IN V
V
V
HOT
Hot Temperature Fault Threshold
Voltage
Falling NTC Voltage
Hysteresis
0.334 • IN 0.349 • IN
0.016 • IN
0.364 • IN V
V
V
DIS
NTC Disable Threshold Voltage Falling NTC Voltage
Hysteresis
●
0.007 • IN 0.017 • IN
0.010 • IN
0.027 • IN mV
mV
I
NTC
NTC Leakage Current NTC = IN = 5V –1 0 1 µA
Logic (HPWR, SUSP,
⎯
C
⎯
H
⎯
R
⎯
G)
V
IL
Input Low Voltage HPWR, SUSP Pins 0.4 V
V
IH
Input High Voltage HPWR, SUSP Pins 1.2 V
R
DN
Logic Pin Pull-Down Resistance HPWR, SUSP Pins
●
1.9 3.6 6.3 MΩ
⎯
C
⎯
H
⎯
R
⎯
G
⎯
C
⎯
H
⎯
R
⎯
G Pin Output Low Voltage I
⎯
C
⎯
H
⎯
R
⎯
G
= 5mA 100 250 mV
I
⎯
C
⎯
H
⎯
R
⎯
G
⎯
C
⎯
H
⎯
R
⎯
G Pin Input Current BAT = 4.5V,
⎯
C
⎯
H
⎯
R
⎯
G = 5V 0 1 µA
Note 4: IN supply current does not include current through the PROG pin
or any current delivered to the battery through the BAT pin. Total input
current is equal to this specifi cation plus 1.00125 • I
BAT
where I
BAT
is the
charge current.
Note 5: h
C/10
is expressed as a fraction of measured full charge current
with indicated PROG resistor.