ltc4078 Linear Technology Corporation, ltc4078 Datasheet - Page 4

• Manufacturer Part Number: ltc4078
• Description: Dual Input Li-ion Battery Charger With Overvoltage Protection
• Manufacturer: Linear Technology Corporation

LTC4078/LTC4078X
TYPICAL PERFORMANCE CHARACTERISTICS
4
4.26
4.24
4.22
4.20
4.18
4.16
4.14
4.12
4.10
1.008
1.006
1.004
1.002
1.000
0.998
0.996
0.994
0.992
0
–10
Regulated Output (Float) Voltage
vs Charge Current
V
IUSB Pin Voltage vs Temperature
(Constant-Current Mode)
DCIN
V
100
USBIN
R
= V
IDC
200
10
= 5V
USBIN
= R
300
IUSB
TEMPERATURE (°C)
= 5V
I
30
400
= 2k
BAT
60
50
40
30
20
10
0
(mA)
500
0
PWR Pin I-V Curve
V
DCIN
50
600
= V
1
R
IDC
700
USBIN
70
= 1.24k
800
2
4078x G01
= 5V
4078x G04
V
900
PWR
90
3
(V)
4
4.220
4.215
4.210
4.205
4.200
4.195
4.190
4.185
4.180
900
800
700
600
500
400
300
200
100
0
–10
0
Regulated Output (Float) Voltage
vs Temperature
Charge Current
vs IDC Pin Voltage
5
V
V
DCIN
DCIN
4078x G07
0.2
= V
= 5V
10
6
USBIN
TEMPERATURE (°C)
0.4
= 5V
30
V
IDC
0.6
R
IDC
(V)
50
= 1.24k
0.8
R
60
50
40
30
20
10
IDC
0
R
70
0
IDC
1.0
CHRG Pin I-V Curve
V
= 10k
DCIN
4078x G02
4078x G05
= 2k
T
A
= V
1
= 25°C, unless otherwise specifi ed.
1.2
90
USBIN
2
= 5V
V
1.008
1.006
1.004
1.002
1.000
0.998
0.996
0.994
0.992
CHRG
900
800
700
600
500
400
300
200
100
3
0
–10
0
(V)
IDC Pin Voltage vs Temperature
(Constant-Current Mode)
Charge Current
vs IUSB Pin Voltage
V
V
USBIN
DCIN
4
0.2
= 5V
10
= 5V
5
TEMPERATURE (°C)
0.4
4078x G08
30
V
IUSB
6
R
0.6
IUSB
(V)
50
= 1.24k
0.8
R
R
IUSB
IUSB
70
1.0
= 10k
4078x G06
4078x G03
4078xfb
= 2k
1.2
90