Datasheet

3
LTC4065/LTC4065A
4065fb
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
PROG
PROG Pin Pull-Up Current V
PROG
> 1V 3 µA
(LTC4065A)
V
MS,PROG
PROG Shutdown Threshold Voltage V
PROG
Rising ● 3.7 4 4.3 V
(LTC4065A Only)
t
SS
Soft-Start Time 180 µs
I
TRKL
Trickle Charge Current V
BAT
= 2V, R
PROG
= 2k (0.1%) 35 50 65 mA
V
TRKL
Trickle Charge Threshold Voltage V
BAT
Rising ● 2.7 2.9 3.05 V
V
TRHYS
Trickle Charge Hysteresis Voltage 90 mV
∆V
RECHRG
Recharge Battery Threshold Voltage V
FLOAT
– V
RECHRG
, 0°C < T
A
< 85°C 70 100 130 mV
∆V
UVCL1
(V
CC
– V
BAT
) Undervoltage Current I
BAT
= 90% Programmed Charge Current 180 220 330 mV
∆V
UVCL2
Limit I
BAT
= 10% Programmed Charge Current 90 125 150 mV
t
TIMER
Termination Timer ● 3 4.5 6 Hrs
Recharge Time ● 1.5 2.25 3 Hrs
Low-Battery Trickle Charge Time V
BAT
= 2.5V ● 0.75 1.125 1.5 Hrs
V
ACPR
ACPR Pin Output Low Voltage I
ACPR
= 5mA ● 60 105 mV
(LTC4065A)
I
ACPR
ACPR Pin Input Current (LTC4065A) V
CC
= 4V, V
ACPR
= 4V, V
BAT
= 4.5V ● 01 µA
V
CHRG
CHRG Pin Output Low Voltage I
CHRG
= 5mA ● 60 105 mV
I
CHRG
CHRG Pin Input Current V
BAT
= 4.5V, V
CHRG
= 5V ● 01 µA
I
C/10
End of Charge Indication Current R
PROG
= 2k (Note 5) ● 0.085 0.1 0.115 mA/mA
Level
T
LIM
Junction Temperature in Constant 115 °C
Temperature Mode
R
ON
Power FET “ON” Resistance I
BAT
= 200mA 450 mΩ
(Between V
CC
and BAT)
f
BADBAT
Defective Battery Detection CHRG 2 Hz
Pulse Frequency
D
BADBAT
Defective Battery Detection CHRG 75 %
Pulse Frequency Duty Ratio
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are T
A
= 25°C.
V
CC
= 5V, V
BAT
= 3.8V, V
EN
= 0V (LTC4065 only) unless otherwise specified. (Note 2)
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: The LTC4065/LTC4065A are guaranteed to meet performance
specifications from 0°C to 70°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 solder the exposed backside of the package to the PC
board ground plane will result in a thermal resistance much higher than
rated.
Note 4: Although the LTC4065 functions properly at 3.75V, full charge
current requires an input voltage greater than the desired final battery
voltage per the ∆V
UVCL1
specification.
Note 5: I
C/10
is expressed as a fraction of measured full charge current
with indicated PROG resistor.
Note 6: 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 specified maximum operating junction
temperature may impair device reliability.