English
Language : 

LTC3455_15 Datasheet, PDF (3/28 Pages) Linear Technology – Dual DC/DC Converter with USB Power Manager and Li-Ion Battery Charger
◁
LTC3455/LTC3455-1
ELECTRICAL CHARACTERISTICS The l 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
ON Pin Pullup Current
CONDITIONS
VON = 1V
MIN
TYP
MAX
2.5
PWRON Pin Pulldown Current
ON2 Pin Pulldown Current
MODE Pin Pullup Current
WALLFB Pin Input Bias Current
PBSTAT Pin Low Voltage
RST Pin Low Voltage
RST Pulse Duration
VPWRON = 1V
VON2 = 1V
VMODE = 1V
VWALLFB = 1.35V
VON = 0V, IPBSTAT = 100μA
VON = 0V, IPBSTAT = 1mA
IRST = 100μA
IRST = 1mA
After FB1 and FB2 in Regulation
2.5
2.5
2.5
l
±1
±30
0.02
0.10
0.20
0.35
0.02
0.10
0.20
0.35
200
Battery-VMAX PMOS
VMAX PMOS Switch On-Resistance
0.15
VMAX Switch Current Limit
VMAX Switch Current Limit at Startup
Gain Block
With VMAX Rising, VMAX = 3V, VBAT = 3.6V
2.5
4.0
0.4
0.9
AI Pin Threshold Voltage
l 0.784 0.805 0.826
AI Pin/FB2 Pin Voltage Difference
AI Pin Input Bias Current
VFB2 – VAI
VAI = 0.85V
–8
0
8
l
±1
±25
AO Pin Sink Current
AO Pin Voltage
Switching Regulators
VAI = 0.6V, VAO = 1.5V
VAI = 0.6V, IAO = 1mA
1.0
1.8
2.5
0.8
1.2
FB1, FB2 Voltage
l 0.784 0.805 0.826
FB1, FB2 Voltage Line Regulation
VMAX = 3V to 5V
0.01
FB1, FB2 Voltage Burst Mode Hysteresis
FB1, FB2 Pin Input Bias Current
Switching Frequency
VMODE = 2V
VFB1 = VFB2 = 0.85V
Both Switchers
8
l
±1
±25
1.2
1.5
1.8
PMOS Switch On-Resistance
Both Switchers
0.35
NMOS Switch On-Resistance
Both Switchers
0.45
PMOS Switch Current Limit
Switcher 1
Switcher 2
450
600
850
700
900
1300
USB Power Manager
USB Undervoltage Lockout Voltage
From Low to High
3.75
3.90
4.10
USB Undervoltage Lockout Hysteresis
150
USB Minimum Voltage to Charge Battery
4.0
USB PMOS Switch On-Resistance
USB Current Limit
USB Suspend Mode Bias Current
SUSPEND Pin Threshold
VUSB = 5V
VUSB = 5V, VUSBHP = 2V
VUSB = 5V, VUSBHP = 0V
VUSB = 5V, VSUSPEND = 2V
0.5
l 440
475
500
l 60
80
100
4
20
0.8
1.1
USBHP Pin Threshold
0.8
1.1
SUSPEND Pin Pulldown Current
VSUSPEND = 0.5V
2.5
USBHP Pin Pulldown Current
VUSBHP = 0.5V
2.5
UNITS
μA
μA
μA
μA
nA
V
V
V
V
ms
Ω
A
A
V
mV
nA
mA
V
V
%/V
mV
nA
MHz
Ω
Ω
mA
mA
V
mV
V
Ω
mA
mA
μA
V
V
μA
μA
3455fc
3
 ▷