LTC4055-1_15 Datasheet, PDF (6/24 Pages) Linear Technology – USB Power Controller and Li-Ion Charger

LTC4055/LTC4055-1
TYPICAL PERFORMANCE CHARACTERISTICS
Regulated Output Voltage-
Recharge Threshold Voltage
vs Temperature
120
V_IN = 5V
115
110
105
100
95
90
85
80
–50 –25 0
25 50 75 100
TEMPERATURE (°C)
4055 G10
Charging from USB, I_BAT
vs V_BAT (LTC4055)
600
V_IN = 5V
V_OUT = NO LOAD
500 _{RPROG = 100k}
R_CLPROG = 100k
HPWR = 1
400 _{TA = 25°C}
300
200
100
0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5
V_BAT (V)
4055 G13
Charge Current vs Temperature
(Thermal Regulation)
1.0
0.9
R_PROG = 50k
0.8
0.7
0.6
0.5
R_PROG = 100k
0.4
0.3
0.2 _{VIN = 5V}
0.1 ^VBAT ^{= 3.5V}
Q_JA = 37°C/W
0
–50 –25 0 25 50 75
TEMPERATURE (°C)
100 125
4055 G16
6
Battery Regulated Output (Float)
Voltage vs Supply Voltage
4.3
T_A = 25°C
LTC4055
4.2
Battery Current and Voltage
vs Time (LTC4055)
600
6
CHRG
500
5
V_BAT
400
4
LTC4055-1
4.1
4.0
4.5 4.75
5 5.25 5.5 5.75 6
V_IN (V)
4055 G11
300
3
200
2
0.8AHr CELL
100
V_IN = 5V
T_A = 25°C
R_PROG = 105k
0
0 20 40 60
I_BAT
1
0
80 100 120 140 160 180 200
TIME (MINUTES)
4055 G12
Charging from USB, Low Power,
I_BAT vs V_BAT (LTC4055)
100
V_IN = 5V
V_OUT = NO LOAD
80
R_PROG = 100k
R_CLPROG = 100k
HPWR = 0
T_A = 25°C
60
40
20
0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5
V_BAT (V)
4055 G14
Undervoltage Current Limit,
Charging from V_IN, I_BAT vs V_IN
1.6
T_A = 25°C
1.4
R_PROG = 34k
1.2
R_PROG = 50k
1.0
0.8
0.6
0.4
0.2
0
4.260
4.300
R_PROG = 100k
R_PROG = 100k
HPWR = 0
4.340 4.380
V_IN (V)
4.420
4055 G15
Ideal Diode Forward Voltage
vs Current and Temperature
1000
900
800
V_BAT = 3.5V
V_IN = 0V
700
600
500
25°C
0°C
–50°C
125°C
75°C
400
300
200
100
0
0 20 40 60 80 100 120 140 160 180 200
V_FWD (mV)
4055 G17
Ideal Diode Forward Voltage and
Resistance vs Current
1000
900
800
V_BAT = 3.5V
V_IN = 0V
T_A = 25°C
700
600
500
400
300
R_DIO(ON)
200
R_FWD
100
0
0 20 40 60 80 100 120 140 160 180 200
V_FWD (mV)
4055 G18
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