LTC4001-1 Linear Technology, LTC4001-1 Datasheet - Page 4

• Manufacturer Part Number: LTC4001-1
• Description: 2A Synchronous Buck Li-Ion Charger
• Manufacturer: Linear Technology

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LTC4001-1
TYPICAL PERFORMANCE CHARACTERISTICS
4
–0.50
–1.00
–0.25
–0.75
0.75
0.50
1.00
0.25
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0
4.25
3
Oscillator Frequency vs V
Dissipation of Figure 8 Circuit
vs V
V
V
V
BAT
SS
BAT
= 1V
IN
3.5
= 3.2V
= 4V
4.5
4
4.75
55
45
40
50
V
V
IN
4.5
IN
0
I
BAT
Trickle Charge Current vs V
I
(V)
BAT
I
I
(V)
BAT
BAT
= 500mA
= 1.5A
5
= 2A
= 1A
0.5
5
V
IN
V
IN
IN
= 4V
5.25
5.5
1
= 4.5V
V
IN
40011 G01
40011 G04
V
= 5.5V
BAT
1.5
5.5
6
(V)
V
2
IN
= 5V
–0.2
0.8
0.6
0.4
0.2
0.4
0.2
1.2
1.0
0.8
0.6
BAT
2.5
0
0
–50
0
Oscillator Frequency
vs Temperature
PROG Pin Characteristic
(V
40011 G07
V
V
V
IN
BAT
SS
–30 –10 10 30 50 70 90
PROG
= 5V
= 1V
3
= 3.2V
vs I
5
V
V
V
BAT
BAT
BAT
TEMPERATURE (°C)
PROG
= 3.2V
= 3.5V
= 3.7V
I
PROG
)
10
(mA)
4.2
4.1
4.0
3.9
–50
V
Threshold Voltage vs Temperature
V
FLOAT
15
BAT
–30
110
V
IN
= 4V
–10
130 150
40011 G02
40011 G05
= 5V
(T
and Recharge Battery
A
10
TEMPERATURE (°C)
20
= 25°C unless otherwise noted)
(V
30
V
BAT
RECHARGE
V
FLOAT
FALLING)
50
1.25
1.00
0.50
0.75
0.25
2.0
1.5
1.0
0.5
70
0
0
500
0
Dissipation of Figure 8 Circuit
vs I
Output Charging Characteristic
Showing Constant Current and
Constant Voltage Operation
V
V
90
IN
BAT
0.5
BAT
= 5V
110
= 4V
130
40011 G08
1
1000
150
1.5
I
V
BAT
BAT
2
(mA)
(V)
2.5
1500
3
3.5
40011 G06
40011 G03
40011fa
4
2000