LTC3441 Linear Technology, LTC3441 Datasheet - Page 5

• Manufacturer Part Number: LTC3441
• Description: Dual DC/DC Converter with USB Power Manager and Li-Ion Battery Charger
• Manufacturer: Linear Technology

TYPICAL PERFOR A CE CHARACTERISTICS
4.00
3.75
3.50
3.25
3.00
2.75
2.50
815
810
805
800
795
790
785
500
400
300
200
100
0
–50
–50
–50
Feedback Pins (FB1, FB2)
and AI Pin Voltage
USB Pin Current Limit
Battery Undervoltage Lockout
V
USB
–25
–25
–25
= 5V
0
0
0
TEMPERATURE ( C)
TEMPERATURE ( C)
TEMPERATURE ( C)
FB2
FALLING
RISING
USBHP = 2V
USBHP = 0V
25
25
25
50
50
50
FB1
AI
75
75
75
W
100
100
100
3455 G04
3455 G07
3455 G10
U
125
125
125
4.00
3.75
3.50
3.25
3.00
2.75
2.50
2.0
1.5
1.0
0.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0
–50
–50
–50
Switching Regulator Oscillator
Frequency
V
USB Undervoltage Lockout
MAX
STARTUP
–25
–25
–25
Pin Current Limit
FOR BOTH SWITCHERS
0
0
0
TEMPERATURE ( C)
TEMPERATURE ( C)
TEMPERATURE ( C)
NORMAL OPERATION
RISING
25
25
25
50
50
50
FALLING
75
75
75
100
100
100
3455 G05
3455 G08
3455 G11
125
125
125
1000
1.26
1.24
1.22
1.20
1.18
1.16
1.14
1.12
1.10
800
600
400
200
200
150
100
50
0
0
–50
–50
–50
Switching Regulator Current Limit
HSO Pin Current Limit
WALLFB Trip Voltage
V
V
HSI
HSO
–25
–25
–25
= 3.3V
= 2.5V
0
0
0
TEMPERATURE ( C)
TEMPERATURE ( C)
TEMPERATURE ( C)
SWITCHER 2
FALLING
RISING
SWITCHER 1
25
25
25
LTC3455
50
50
50
75
75
75
100
100
100
3455 G06
3455 G09
3455 G12
5
3455f
125
125
125