Datasheet

LTC4062
3
4062fb
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 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 LTC4062 is 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 correctly solder the exposed pad of the package to the
PC board will result in a thermal resistance much higher than 40°C/W.
Note 4: Supply current includes PROG pin current and I
DET
pin current
(approximately 100µA each) but does not include any current delivered to
the battery through the BAT pin (approximately 100mA).
Note 5: This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions.
Overtemperature protection will become active at a junction temperature
greater than the maximum operating temperature. Continuous operation
above the specified maximum operating junction temperature may impair
device reliability.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
EN
EN Input Threshold Voltage EN Rising, 4.3V < V
CC
< 8V 0.4 0.7 1 V
Hysteresis 70 mV
V
CT
Charge Termination Mode Threshold V
TIMER
from High to Low 0.4 0.7 1 V
Voltage Hysteresis 50 mV
V
UT
User Termination Mode Threshold V
TIMER
from Low to High 3.9 4.2 V
Voltage Hysteresis 50 mV
I
DETECT
Charge Current Detection Threshold R
DET
= 1k, 0 ≤ T
A
≤ 85°C 90 100 110 mA
R
DET
= 2k, 0 ≤ T
A
≤ 85°C455055mA
R
DET
= 10k, 0 ≤ T
A
≤ 85°C81012mA
R
DET
= 20k, 0 ≤ T
A
≤ 85°C 3.8 5 6.2 mA
∆V
RECHRG
Recharge Threshold Voltage V
FLOAT
– V
RECHRG
, 0 ≤ T
A
≤ 85°C 65 100 135 mV
t
SS
Soft-Start Time I
BAT
from 0 to I
CHG
100 µs
t
TERM
Termination Comparator Filter Time Current Termination Mode 0.8 1.5 2.5 ms
t
RECHRG
Recharge Comparator Filter Time 3 7 14 ms
t
TIMER
Charge Cycle Time C
TIMER
= 0.1µF 2.55 3 3.45 hr
R
C/5
C/5 Pin Pull-Down Resistor ● 2 3.4 5 MΩ
V
C/5
C/5 Input Threshold Voltage C/5 Rising, 4.3V < V
CC
< 8V 0.4 0.7 1 V
Hysteresis 70 mV
T
LIM
Junction Temperature in Constant 105 °C
Temperature Mode
R
ON
Power FET “ON” Resistance V
BAT
= 3.85V, I
CC
= 175mA, R
PROG
= 2k 375 mΩ
(Between V
CC
and BAT)
Comparator
V
IN
+ IN
+
Pin Threshold Voltage V
IN
+ Falling ● 0.988 1 1.012 V
Hysteresis 50 mV
V
BAT-MIN
Minimum V
BAT
Supply Voltage for the V
CC
= 0V, V
BAT
Falling 2.4 2.5 2.6 V
Low Power Comparator Hysteresis 100 mV
I
BAT
Supply Current for the Low Power V
CC
= 0V, V
BAT
= 2.5V 7 9 13 µA
Comparator