Datasheet

LTC4085
4
4085fd
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CHG(SD)
Charger Shutdown Threshold Voltage
on TIMER
l
0.15 0.4 V
I
CHG(SD)
Charger Shutdown Pull-Up Current
on TIMER
V
TIMER
= 0V
l
514 μA
V
WAR
Absolute Wall Input Threshold Voltage V
WALL
Rising Threshold
l
4.15 4.25 4.35 V
V
WAF
Absolute Wall Input Threshold Voltage V
WALL
Falling Threshold 3.12 V
V
WDR
Delta Wall Input Threshold Voltage V
WALL
– V
BAT
Rising Threshold 75 mV
V
WDF
Delta Wall Input Threshold Voltage V
WALL
– V
BAT
Falling Threshold
l
02550 mV
I
WALL
Wall Input Current V
WALL
= 5V 75 150 μA
NTC
V
VNTC
V
NTC
Bias Voltage I
VNTC
= 500μA
l
4.4 4.85 V
I
NTC
NTC Input Leakage Current V
NTC
= 1V 0 ±1 μA
V
COLD
Cold Temperature Fault Threshold
Voltage
Rising Threshold
Hysteresis
0.74 • V
VNTC
0.02 • V
VNTC
V
V
V
HOT
Hot Temperature Fault Threshold
Voltage
Falling Threshold
Hysteresis
0.29 • V
VNTC
0.01 • V
VNTC
V
V
V
DIS
NTC Disable Voltage NTC Input Voltage to GND (Falling)
Hysteresis
l
75 100
35
125 mV
mV
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: V
CC
is the greater of V
IN
, V
OUT
or V
BAT
.
Note 3: All voltage values are with respect to GND.
Note 4: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperatures will exceed 125°C when overtemperature protection is
active. Continuous operation above the specified maximum operating
junction temperature may result in device degradation or failure.
Note 5: The LTC4085E is guaranteed to meet specified performance from
0°C to 85°C. Specifications over the –40°C to 85°C operating temperature
range are assured by design, characterization and correlation with
statistical process controls.
Note 6: Guaranteed by long term current density limitations.
Note 7: Total input current is equal to this specification plus 1.002 • I
BAT
where I
BAT
is the charge current.
Note 8: Accuracy of programmed current may degrade for currents greater
than 1.5A.
The l indicates specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 5V, V
BAT
= 3.7V, HPWR = 5V, WALL = 0V, R
PROG
= 100k,
R
CLPROG
= 2k, unless otherwise noted.
ELECTRICAL CHARACTERISTICS