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LTC3455 Datasheet(PDF) 3 Page - Linear Technology

Part # LTC3455
Description  Dual DC/DC Converter with USB Power Manager and Li-Ion Battery Charger
PDF  24 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3455 Datasheet(HTML) 3 Page - Linear Technology

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LTC3455
3
3455f
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VBAT = 3.6V, VMAX = 3.6V, VPWRON = 2V, VON is open, VON2 = 0V,
VUSB = 0V, VWALLFB = 0V unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Battery-VMAX PMOS
VMAX PMOS Switch On-Resistance
0.15
Ω
VMAX Switch Current Limit
2.5
4.0
A
VMAX Switch Current Limit at Startup
With VMAX Rising, VMAX = 3V, VBAT = 3.6V
0.4
0.9
A
Gain Block
AI Pin Threshold Voltage
q
0.784
0.805
0.826
V
AI Pin/FB2 Pin Voltage Difference
VFB2 – VAI
–8
0
8
mV
AI Pin Input Bias Current
VAI = 0.85V
q
±1
±25
nA
AO Pin Sink Current
VAI = 0.6V, VAO = 1.5V
1.0
1.8
2.5
mA
AO Pin Voltage
VAI = 0.6V, IAO = 1mA
0.8
1.2
V
Switching Regulators
FB1, FB2 Voltage
q
0.784
0.805
0.826
V
FB1, FB2 Voltage Line Regulation
VMAX = 3V to 5V
0.01
%/V
FB1, FB2 Voltage Burst Mode Hysteresis
VMODE = 2V
8
mV
FB1, FB2 Pin Input Bias Current
VFB1 = VFB2 = 0.85V
q
±1
±25
nA
Switching Frequency
Both Switchers
1.2
1.5
1.8
MHz
PMOS Switch On-Resistance
Both Switchers
0.35
Ω
NMOS Switch On-Resistance
Both Switchers
0.45
Ω
PMOS Switch Current Limit
Switcher 1
450
600
850
mA
Switcher 2
700
900
1200
mA
USB Power Manager
USB Undervoltage Lockout Voltage
From Low to High
3.75
3.90
4.10
V
USB Undervoltage Lockout Hysteresis
150
mV
USB Minimum Voltage to Charge Battery
4.0
V
USB PMOS Switch On-Resistance
VUSB = 5V
0.5
Ω
USB Current Limit
VUSB = 5V, VUSBHP = 2V
q
440
475
500
mA
VUSB = 5V, VUSBHP = 0V
q
60
80
100
mA
USB Suspend Mode Bias Current
VUSB = 5V, VSUSPEND = 2V
4
20
µA
SUSPEND Pin Threshold
0.8
1.1
V
USBHP Pin Threshold
0.8
1.1
V
SUSPEND Pin Pulldown Current
VSUSPEND = 0.5V
2.5
µA
USBHP Pin Pulldown Current
VUSBHP = 0.5V
2.5
µA
Hot Swap Output
Hot Swap PMOS Switch On-Resistance
VHSI = 3.3V
0.9
Ω
Hot Swap PMOS Switch Current Limit
VHSI = 3.3V, VHSO = 2.5V
120
160
mA
HSON Pin Threshold
0.8
1.1
V
HSON Pin Pulldown Current
2.5
µA



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