Datasheet

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