ltc3455euf-trpbf Linear Technology Corporation, ltc3455euf-trpbf Datasheet - Page 6

• Manufacturer Part Number: ltc3455euf-trpbf
• Description: Dual Dc/dc Converter With Usb Power Manager And Li-ion Battery Charger
• Manufacturer: Linear Technology Corporation

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