LTC4001 Datasheet, PDF (4/20 Pages) Linear Technology – 2A Synchronous Buck Li-Ion Charger

LTC4001
TYPICAL PERFOR A CE CHARACTERISTICS (T_A = 25°C unless otherwise noted)
Oscillator Frequency vs V_IN
1.00
V_BAT = 3.2V
0.75 ^{VSS = 1V}
0.50
0.25
0
–0.25
–0.50
–0.75
–1.00
3 3.5 4 4.5 5 5.5 6
V_IN (V)
4001 G01
Oscillator Frequency
vs Temperature
0.8
V_IN = 5V
V_BAT = 3.2V
0.6 ^{VSS = 1V}
0.4
0.2
0
–0.2
–50 –30 –10 10 30 50 70 90 110 130 150
TEMPERATURE (°C)
4001 G02
Dissipation of Figure 8 Circuit
vs V_IN
1.4
V_BAT = 4V
I_BAT = 2A
1.2
1.0
0.8
I_BAT = 1.5A
0.6
I_BAT = 1A
0.4
I_BAT = 500mA
0.2
PROG Pin Characteristic
(V_PROG vs I_PROG)
1.2
V_IN = 5V
1.0
V_BAT = 3.2V
V_BAT = 4V
0.8
V_BAT = 3.5V
V_BAT = 3.7V
0.6
0.4
0.2
Dissipation of Figure 8 Circuit
vs I_BAT
1.25
V_IN = 5V
V_BAT = 4V
1.00
0.75
0.50
0.25
0
500
1000
1500
I_BAT (mA)
2000
4001 G03
Output Charging Characteristic
Showing Constant Current and
Constant Voltage Operation
2.0
1.5
1.0
0.5
0
4.25 4.5 4.75
5
V_IN (V)
5.25 5.5
4001 G04
0
0
5
10
15
20
I_PROG (mA)
4001 G05
0
0 0.5 1 1.5 2 2.5 3 3.5 4
V_BAT (V)
4001 G06
Trickle Charge Current vs V_BAT
55
V_FLOAT and Recharge Battery
Threshold Voltage vs Temperature
4.3
V_IN = 5.5V
50
V_IN = 5V
V_IN = 4V
V_IN = 4.5V
45
V_FLOAT
4.2
V_RECHARGE
(V_BAT FALLING)
4.1
4
40
0 0.5 1 1.5 2 2.5 3
V_BAT (V)
4001 G07
4.0
–50 –30 –10 10 30 50 70 90 110 130 150
TEMPERATURE (°C)
4001 G08
4001f