LTC3550 Datasheet, PDF (3/24 Pages) Linear Technology – Dual Input USB/AC Adapter Li-Ion Battery Charger with 600mA Buck Converter

LTC3550
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. V_DCIN = 5V, V_USBIN = 5V, V_CC = 3.6V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Battery Charger
I_DCIN
DCIN Supply Current
Charge Mode (Note 5)
Standby Mode
Shutdown Mode
R_IDC = 10k
Charge Terminated
ENABLE = 5V
●
250
800
µA
●
50
100
µA
20
40
µA
I_USBIN
V_FLOAT
I_BAT
USBIN Supply Current
Charge Mode (Note 6)
Standby Mode
Shutdown Mode
Shutdown Mode
Regulated Output (Float) Voltage
BAT Pin Current
Constant-Current Mode
Constant-Current Mode
Constant-Current Mode
Standby Mode
Shutdown Mode
Sleep Mode
R_IUSB = 10k, V_DCIN = 0V
Charge Terminated
V_DCIN = 0V, ENABLE = 0V
V_DCIN > V_USBIN
I_BAT = 1mA
I_BAT = 1mA, 0°C < T_A < 85°C
R_IDC = 1.25k
R_IUSB = 2.1k
R_IDC = 10k or R_IUSB = 10k
Charge Terminated
Charger Disabled
DCIN = 0V, USBIN = 0V
●
250
800
µA
●
50
100
µA
18
36
µA
10
20
µA
4.175 4.2 4.225
V
4.158 4.2 4.242
V
● 760
800
840
mA
● 450
476
500
mA
● 93
100
107
mA
–3
–6
µA
–1
–2
µA
±1
±2
µA
V_IDC
V_IUSB
I_TERMINATE
I_TRIKL
V_TRIKL
IDC Pin Regulated Voltage
IUSB Pin Regulated Voltage
Charge Current Termination Threshold
Trickle Charge Current
Trickle Charge Threshold Voltage
Constant-Current Mode
Constant-Current Mode
R_ITERM = 1k
R_ITERM = 2k
R_ITERM = 10k
R_ITERM = 20k
V_BAT < V_TRIKL; R_IDC = 1.25k
V_BAT < V_TRIKL; R_IUSB = 2.1k
V_BAT Rising
Hysteresis
0.95
1.0
1.05
V
0.95
1.0
1.05
V
● 90
100
110
mA
● 45
50
55
mA
● 8.5
10
11.5
mA
●
4
5
6
mA
60
80
100
mA
30
47.5
65
mA
2.8
2.9
3
V
100
mV
ΔV_RECHRG
t_RECHRG
t_TERMINATE
t_SS
R_ON-DC
Recharge Battery Threshold Voltage
Recharge Comparator Filter Time
Termination Comparator Filter Time
Soft-Start Time
Power FET On-Resistance (Between
DCIN and BAT)
V_FLOAT – V_RECHRG, 0°C < T_A < 85°C
V_BAT from High to Low
I_BAT Drops Below Termination Threshold
I_BAT = 10% to 90% Full-Scale
65
100
135
mV
3
6
9
ms
0.8
1.5
2.2
ms
175
250
325
µs
400
mΩ
R_ON-USB
Power FET On-Resistance (Between
USBIN and BAT)
550
mΩ
T_LIM
Junction Temperature in Constant-
Temperature Mode
105
°C
Switching Regulator
V_FB
ΔV_FB
I_PK
V_LOADREG
Regulated Feedback Voltage
Reference Voltage Line Regulation
Peak Inductor Current
Output Voltage Load Regulation
T_A = 25°C
0°C ≤ T_A ≤ 85°C
–40°C ≤ T_A ≤ 85°C
V_CC = 3V, V_FB = 0.5V
0.5880 0.6 0.6120
V
0.5865 0.6 0.6135
V
● 0.5850 0.6 0.6150
V
●
0.04 0.4
%/V
0.75
1
1.25
A
0.5
%
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