LTC3550 Datasheet, PDF (6/24 Pages) Linear Technology – Dual Input USB/AC Adapter Li-Ion Battery Charger with 600mA Buck Converter

LTC3550
TYPICAL PERFOR A CE CHARACTERISTICS T_A = 25°C, unless otherwise noted.
Charge Current
vs Ambient Temperature
1000
ONSET OF
THERMAL REGULATION
800
R_IDC = 1.25k
600
400
R_IDC = R_IUSB = 2k
200 _{VDCIN = VUSBIN = 5V}
V_BAT = 4V
θ_JA = 40°C/W
0
–50 –25 0 25 50 75
TEMPERATURE (°C)
100 125
3550 G10
DCIN Power FET On-Resistance
vs Temperature
550
V_BAT = 4V
I_BAT = 200mA
500
450
400
350
300
250
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3550 G13
DCIN Shutdown Current
vs Temperature
50
45
40
V_DCIN = 8V
35
30
25
V_DCIN = 5V
20
15
V_DCIN = 4.3V
10
5
0
–50 –25
ENABLE = 5V
0 25 50 75 100
TEMPERATURE (°C)
3550 G16
6
Charge Current
vs DCIN Voltage
900
ONSET OF
THERMAL REGULATION
800
700
600
500
400
R_IDC = 1.25k
V_BAT = 4V
θ_JA = 40°C/W
300
4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0
V_DCIN (V)
3550 G11
USBIN Power FET On-Resistance
vs Temperature
800
V_BAT = 4V
750 ^IBAT ^{= 200mA}
700
650
600
550
500
450
400
350
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
3550 G14
USBIN Shutdown Current
vs Temperature
45
40
35
V_USBIN = 8V
30
25
20 _{VUSBIN = 5V}
15
10 V_USBIN = 4.3V
5
0
–50 –25
ENABLE = 0V
0 25 50 75 100
TEMPERATURE (°C)
3550 G17
Charge Current vs Battery Voltage
1000
800
600
400
200
V_DCIN = V_USBIN = 5V
θ_JA = 40°C/W
R_IDC = 1.25k
0
2.4 2.7 3.0 3.3 3.6 3.9 4.2 4.5
V_BAT (V)
3550 G12
EN Pin Threshold Voltage
(On-to-Off) vs Temperature
900
V_DCIN = V_USBIN = 5V
850
800
750
700
650
600
–50 –25
0 25 50
TEMPERATURE (°C)
75 100
3550 G15
HPWR Pin Threshold Voltage
(Rising) vs Temperature
900
V_DCIN = V_USBIN = 5V
850
800
750
700
650
600
–50 –25
0 25 50
TEMPERATURE (°C)
75 100
3550 G44
3550fa