Datasheet

3
LTC4001
4001f
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
t
TIMER
Timer Accuracy C
TIMER
= 0.22µF ±10 %
V
EN
Enable Input Threshold Voltage V
EN
Rising 0.6 0.8 1 V
∆V
EN
Enable Input Hysteresis 100 mV
V
PROG
PROG Pin Voltage R
PROG
= 549Ω 1.213 V
V
IDET
IDET Pin Voltage R
IDET
= 549Ω 1.213 V
I
IDET
IDET Threshold R
IDET
= 549Ω 150 200 250 mA
I
CHRG
CHRG Pin Weak Pull-Down Current V
CHRG
= 1V 15 30 50 µA
V
CHRG
CHRG Pin Output Low Voltage I
CHRG
= 5mA 0.2 0.4 V
V
OL
FAULT Pin Output Low Voltage 1mA Load 0.4 V
V
OH
FAULT Pin Output High Voltage 1mA Load 4.6 V
V
RECHRG
Recharge Battery Threshold Voltage V
FLOAT
– V
RECHRG
V
BAT
Falling 50 100 135 mV
t
RB
Recharge Filter Time Constant 4 ms
t
RECHRG
Recharge Time Percent of Total Charge Time 50 %
t
TRIKL
Low-Battery Trickle Charge Time Percent of Total Charge Time, V
BAT
< 2.8V, 25 %
Measured Using BATSENS and GNDSENS Pins
I
SS
Soft-Start Ramp Current V
BAT
< V
FLOAT
– 100mV, V
BAT
Across BATSENS 6 12.8 16 µA
and GNDSENS Pins
V
COLD
NTC Pin Cold Temperature Fault From NTC to GNDSENS Pin
Threshold Rising Threshold 0.74 V
INSENSE
V
Falling Threshold 0.72 V
INSENSE
V
V
HOT
NTC Pin Hot Temperature Fault From NTC to GNDSENS Pin
Threshold Falling Threshold 0.29 V
INSENSE
V
Rising Threshold 0.30 V
INSENSE
V
V
DIS
NTC Disable Threshold (Falling) From NTC to GNDSENS Pin 0.015 • 0.02 • 0.025 • V
V
INSENSE
V
INSENSE
V
INSENSE
∆V
DIS
NTC Disable Hysteresis From NTC to GNDSENS Pin 0.01 • V
INSENSE
V
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are T
A
= 25°C.
V
IN
= 5V, V
EN
= 0V, R
PROG
= 549Ω, R
IDET
= 549Ω, unless otherwise specified.
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: Operation with current limited wall adapters is allowed down to the
undervoltage lockout threshold.
Note 3: The LTC4001E is guaranteed to meet 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 4: T
J
is calculated from the ambient temperature T
A
and power
dissipation P
D
according to the following formula:
T
J
= T
A
+ (P
D
• 37°C/W)
Note 5: This IC includes overtemperature protection that is intended to
protect the device during momentary overload. Junction temperature will
exceed 125°C when overtemperature protection is active. Continuous
operation above the specified maximum operating junction temperature
my impair device reliability.