LTC4055/LTC4055-1
4
4055fb
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN1
= V
IN2
= 5V, V
BAT
= 3.5V, HPWR = 5V, WALL = 0V,
R
PROG
= R
CLPROG
= 100k, unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Logic
V
OL
Output Low Voltage (CHRG, ACPR)I
SINK
= 5mA
l
0.2 0.4 V
V
IH
Enable Input High Voltage SUSP, SHDN, HPWR Pin Low to High
l
1.2 V
V
IL
Enable Input Low Voltage SUSP, SHDN, HPWR Pin High to Low
l
0.4 V
I
PULLDN
Logic Input Pull-Down Current SUSP, SHDN, HPWR 2 μA
V
CHG,SD
Charger Shutdown Threshold Voltage
on TIMER
TIMER Falling
l
0.15 0.4 V
I
CHG,SD
Charger Shutdown Pull-Up Current
on TIMER
V
TIMER
= 0V
l
24 μA
V
WALL
Wall Input Threshold Voltage V
WALL
Rising Threshold
l
0.98 1.000 1.02 V
V
WALL,HYS
Wall Input Hysteresis V
WALL
Rising – V
WALL
Falling Threshold 35 mV
I
WALL
Wall Input Leakage Current V
WALL
= 1V 0 ±50 nA
NTC
I
VNTC
V
NTC
Pin Current V
VNTC
= 2.5V
l
1.5 2.5 3.5 mA
V
VNTC
V
NTC
Bias Voltage I
VNTC
= 500μA
l
3.4 3.8 V
V
COLD
Cold Temperature Fault Threshold
Voltage
Rising Threshold
Falling Threshold
0.74 • V
VNTC
0.72 • V
VNTC
V
V
V
HOT
Hot Temperature Fault Threshold
Voltage
Falling Threshold
Rising Threshold
0.29 • V
VNTC
0.30 • V
VNTC
V
V
V
DIS
NTC Disable Voltage NTC Input Voltage to GND (Falling)
Hysteresis
l
75 100
50
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
IN1
, V
OUT
or V
BAT
.
Note 3: IN1 and IN2 should be tied together with a low impedance to
ensure that the difference between the two pins does not exceed 100mV.
Note 4: All voltage values are with respect to GND.
Note 5: 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.
Note 6: The LTC4055EUF/LTC4055EUF-1 are 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 7: Guaranteed by long-term current density limitations.
Note 8: Accuracy of programmed current may degrade for currents greater
than 1A.
