Datasheet

LTC4081
5
4081f
V
CC
SUPPLY VOLTAGE (V)
4
FLOAT VOLTAGE (V)
4.20
5.5
4.05
3.95
4.5 5
3.90
3.85
4.25
4.15
4.10
4.00
6
4081 G03
CHARGE CURRENT (mA)
0
4.17
4.18
4.21
4.20
150
4081 G01
4.16
4.15
50 100
200 250
4.14
4.13
4.19
FLOAT VOLTAGE (V)
R
PROG
= 2k
TEMPERATURE (°C)
–50
FLOAT VOLTAGE (V)
4.195
10
4.180
4.170
–30 –10 30
4.165
4.160
4.210
4.205
4.200
4.190
4.185
4.175
50 70 90
4081 G02
TEMPERATURE (°C)
–50
200
250
100
150
100
0–25 50
125
25 75
50
0
CHARGE CURRENT (mA)
4081 G04
V
CC
= 6V
V
BAT
= 3V
R
PROG
= 2k
THERMAL CONTROL
LOOP IN OPERATION
CHARGE CURRENT (mA)
0
V
PROG
(V)
0.6
0.8
1.0
175
0.4
0.2
0
25
75
12550
100
150
200
4081 G05
R
PROG
= 2k
TEMPERATURE (°C)
–50
R
DS(ON)
(Ω)
0.7
10
0.4
0.2
–30 –10 30
0.1
0
0.9
0.8
0.6
0.5
0.3
50 70 90
4081 G06
V
CC
= 4V
I
BAT
= 350mA
TEMPERATURE (°
C)
–50
0.50
THRESHOLD VOLTAGE (V)
0.55
0.65
0.70
0.75
30
0.95
0.60
–10
–30
50 70
10 90
0.80
0.85
0.90
4081 G07
FALLING
RISING
TEMPERATURE (°C)
1.0
1.1
1.3
1.4
1.5
1.7
1.2
1.6
4081 G08
–50
PULLDOWN RESISTANCE (MΩ)
30
–10
–30
50 70
10 90
Battery Regulation (Float) Voltage
vs Charge Current
Battery Regulation (Float) Voltage
vs Temperature
Battery Regulation (Float) Voltage
vs V
CC
Supply Voltage
Charge Current vs Temperature
with Thermal Regulation
(Constant-Current Mode)
PROG Pin Voltage
vs Charge Current
Charger FET On-Resistance
vs Temperature
⎯
E
⎯
N
⎯
_
⎯
C
⎯
H
⎯
R
⎯
G, EN_BUCK and
MODE Pin Threshold Voltage
vs Temperature
⎯
E
⎯
N
⎯
_
⎯
C
⎯
H
⎯
R
⎯
G Pin Pulldown
Resistance vs Temperature
TYPICAL PERFORMANCE CHARACTERISTICS
(T
A
= 25°C, V
CC
= 5V, V
BAT
= 3.8V, unless otherwise
specifi ed)