Datasheet
4
LTC4001
4001f
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Oscillator Frequency vs V
IN
Oscillator Frequency
vs Temperature
Dissipation of Figure 8 Circuit
vs I
BAT
PROG Pin Characteristic
(V
PROG
vs I
PROG
)
Dissipation of Figure 8 Circuit
vs V
IN
Trickle Charge Current vs V
BAT
V
FLOAT
and Recharge Battery
Threshold Voltage vs Temperature
Output Charging Characteristic
Showing Constant Current and
Constant Voltage Operation
(T
A
= 25°C unless otherwise noted)
V
IN
(V)
3
PERCENT VARIATION (%)
–0.25
0
0.25
4.5
5.5
4001 G01
–0.50
–0.75
–1.00
3.5 4 5
0.50
0.75
1.00
6
V
BAT
= 3.2V
V
SS
= 1V
I
PROG
(mA)
0
0.8
1.0
15
4001 G05
0.6
0.4
510 20
0.2
0
1.2
V
PROG
(V)
V
IN
= 5V
V
BAT
= 3.2V V
BAT
= 4V
V
BAT
= 3.5V
V
BAT
= 3.7V
V
BAT
(V)
0
0
I
BAT
(A)
0.5
1.0
1.5
2.0
0.5 1 1.5 2
4001 G06
2.5 3 3.5 4
V
BAT
(V)
0
40
I
BAT
(mA)
45
50
55
0.5 1 1.5 2
4001 G07
2.5 3
V
IN
= 5.5V
V
IN
= 5V
V
IN
= 4V
V
IN
= 4.5V
TEMPERATURE (°C)
–50
FREQUENCY VARIATION FROM 25°C (%)
0.4
0.6
0.8
110
4001 G02
0.2
0
–0.2
–30 –10 10
30 50
70 90 130
150
V
IN
= 5V
V
BAT
= 3.2V
V
SS
= 1V
I
BAT
(mA)
500
TOTAL APPLICATION CIRCUIT POWER
DISSIPATION (W)
0.50
0.75
4001 G03
0.25
0
1000
1500
2000
1.25
1.00
V
IN
= 5V
V
BAT
= 4V
V
IN
(V)
4.25
1.0
1.2
1.4
5.25
4001 G04
0.8
0.6
4.5 4.75 5 5.5
0.4
0.2
0
TOTAL APPLICATION CIRCUIT POWER
DISSIPATION (W)
I
BAT
= 2A
V
BAT
= 4V
I
BAT
= 1.5A
I
BAT
= 1A
I
BAT
= 500mA
TEMPERATURE (°C)
4.0
FLOAT AND RECHARGE VOLTAGES (V)
4.1
4.2
4.3
–10 30 70 110
4001 G08
150–30–50 10 50 90 130
V
FLOAT
V
RECHARGE
(V
BAT
FALLING)