LTC4077
3
4077fa
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
C/2
Charge Current Termination Threshold HPWR = 0V (Note 8) ● 0.45 0.5 0.55 mA/mA
I
TRIKL
Trickle Charge Current V
BAT
< V
TRIKL
; R
IDC
= 1.25k 60 80 100 mA
V
BAT
< V
TRIKL
; R
IUSB
= 2.1k 30 47.5 65 mA
V
BAT
< V
TRIKL
; R
IUSBL
= 4k 17 25 33 mA
V
TRIKL
Trickle Charge Threshold Voltage V
BAT
Rising 2.8 2.9 3 V
Hysteresis 100 mV
V
UVDC
DCIN Undervoltage Lockout Voltage From Low to High 4 4.15 4.3 V
Hysteresis 200 mV
V
UVUSB
USBIN Undervoltage Lockout Voltage From Low to High 3.8 3.95 4.1 V
Hysteresis 200 mV
V
ASD-DC
V
DCIN
– V
BAT
Lockout Threshold V
DCIN
from Low to High, V
BAT
= 4.2V 140 180 220 mV
V
DCIN
from High to Low, V
BAT
= 4.2V 20 50 80 mV
V
ASD-USB
V
USBIN
– V
BAT
Lockout Threshold V
USBIN
from Low to High 140 180 220 mV
V
USBIN
from High to Low 20 50 80 mV
V
EN
EN Input Threshold Voltage 0.4 0.7 1 V
R
EN
EN Pulldown Resistance ● 1 2 5 MΩ
V
HPWR
HPWR Input Threshold Voltage 0.4 0.7 1 V
R
HPWR
HPWR Pulldown Resistance ● 1 2 5 MΩ
V
C
H
R
G
C
H
R
G Output Low Voltage I
C
H
R
G
= 5mA 0.35 0.6 V
V
P
W
R
P
W
R Output Low Voltage I
P
W
R
= 5mA 0.35 0.6 V
ΔV
RECHRG
Recharge Battery Threshold Voltage V
FLOAT
– V
RECHRG
, 0°C < T
A
< 85°C 65 100 135 mV
t
RECHRG
Recharge Comparator Filter Time V
BAT
from High to Low 3 6 10 ms
t
TERMINATE
Termination Comparator Filter Time I
BAT
Drops Below Termination Threshold 0.8 1.5 2.2 ms
t
SS
Soft-Start Time I
BAT
= 10% to 90% Full-Scale 175 250 325 µs
R
ON-DC
Power FET “ON” Resistance 400 mΩ
(Between DCIN and BAT)
R
ON-USB
Power FET “ON” Resistance 550 mΩ
(Between USBIN and BAT)
T
LIM
Junction Temperature in 105 °C
Constant-Temperature Mode
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
DCIN
= 5V, V
USBIN
= 5V, HPWR = 5V unless otherwise noted.
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 LTC4077E is guaranteed to meet the performance
specifications 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 3: Failure to correctly solder the exposed backside of the package to
the PC board will result in a thermal resistance much higher than 40°C/W.
See Thermal Considerations.
Note 4: Supply current includes IDC pin current (approximately 100µA)
but does not include any current delivered to the battery through the BAT
pin.
Note 5: Supply current includes IUSB and IUSBL pin currents
(approximately 100µA each) but does not include any current delivered to
the battery through the BAT pin.
Note 6: Guaranteed by long term current density limitations.
Note 7: I
C/10
is expressed as a fraction of measured full charge current.
Note 8: I
C/2
is expressed as a fraction of measured full charge current.
Note 9: V
CC
is greater of DCIN or USBIN.
ELECTRICAL CHARACTERISTICS
