LTC3455
TYPICAL PERFOR A CE CHARACTERISTICS
Battery Charger Regulation
Voltage
4.30
4.25
4.20
V
BAT
(V)
4.25
4.20
4.15
4.10
4.05
4.00
–50 –25
TRICKLE CHARGE THRESHOLD (V)
V
RECHARGE
(V)
4.15
4.10
4.05
4.00
–50 –25
50
25
75
0
TEMPERATURE (°C)
Charge Current When
Wall-Powered
600
BATTERY CHARGE CURRENT (mA)
500
400
300
200
100 V
BAT
= 3.6V
V
MAX
= 4.5V
R
PROG
= 2.49k
0
50
–50 –25
25
75
0
TEMPERATURE (°C)
BATTERY CHARGE CURRENT (mA)
THERMAL CONTROL
LOOP IN OPERATION
400
300
200
100
BATTERY CURRENT (µA)
PROG Pin Voltage
vs Charge Current
1.50
V
BAT
= 3.6V
V
MAX
= 4.5V
1.25 R
PROG
= 2.49
T
A
= 25°C
1.00
V
PROG
(V)
R
DS(ON)
PMOS
0.75
0.50
0.25
0
0.3
0.2
0.1
0
–50 –25
R
DS(ON)
0
400
300
100
200
CHARGE CURRENT (mA)
6
U W
100
3455 G13
Battery Charger Recharge
Threshold
4.30
3.0
Battery Charger Trickle-Charge
Threshold
2.9
RISING
2.8
FALLING
2.7
2.6
125
50
25
75
0
TEMPERATURE (°C)
100
125
2.5
–50 –25
50
25
75
0
TEMPERATURE (°C)
100
125
3455 G14
3455 G15
Charge Current When
USB-Powered
600
V
BAT
= 3.6V
V
USB
= 5V
500 R
PROG
= 2.49k
V
USBHP
= 2V
THERMAL CONTROL
LOOP IN OPERATION
15.0
12.5
10.0
7.5
5.0
2.5
Battery Current When
USB- or Wall-Powered
V
BAT
= 4.2V
CHARGER OFF
V
USBHP
= 0V
100
125
0
–50 –25
50
25
75
0
TEMPERATURE (°C)
100
125
0
–50 –25
50
25
75
0
TEMPERATURE (°C)
100
125
3455 G16
3455 G17
3455 G18
R
DS(ON)
for Switching Regulator
Power Switches
0.7
0.6
0.5
0.4
NMOS
V
BAT
= 3.6V
1.4
R
DS(ON)
for V
MAX
, USB, and HSO
PMOS Switches
V
HSI
= 3.3V
V
USB
= 5V
1.2 V
BAT
= 3.6V
HSO
1.0
0.8
0.6
0.4
0.2
0
–50 –25
V
MAX
USB
500
3455 G19
50
25
75
0
TEMPERATURE (°C)
100
125
50
25
75
0
TEMPERATURE (°C)
100
125
3455 G20
3455 G21
3455f
LINER [ LINEAR TECHNOLOGY ]
