Datasheet

LTC3455/LTC3455-1
3
3455fc
ELECTRICAL CHARACTERISTICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
ON Pin Pullup Current V
ON
= 1V 2.5 μA
PWRON Pin Pulldown Current V
PWRON
= 1V 2.5 μA
ON2 Pin Pulldown Current V
ON2
= 1V 2.5 μA
MODE Pin Pullup Current V
MODE
= 1V 2.5 μA
WALLFB Pin Input Bias Current V
WALLFB
= 1.35V
l
±1 ±30 nA
PBSTAT Pin Low Voltage V
ON
= 0V, I
PBSTAT
= 100μA
V
ON
= 0V, I
PBSTAT
= 1mA
0.02
0.20
0.10
0.35
V
V
RST Pin Low Voltage I
RST
= 100μA
I
RST
= 1mA
0.02
0.20
0.10
0.35
V
V
RST Pulse Duration After FB1 and FB2 in Regulation 200 ms
Battery-V
MAX
PMOS
V
MAX
PMOS Switch On-Resistance 0.15 Ω
V
MAX
Switch Current Limit 2.5 4.0 A
V
MAX
Switch Current Limit at Startup With V
MAX
Rising, V
MAX
= 3V, V
BAT
= 3.6V 0.4 0.9 A
Gain Block
AI Pin Threshold Voltage
l
0.784 0.805 0.826 V
AI Pin/FB2 Pin Voltage Difference V
FB2
– V
AI
–8 0 8 mV
AI Pin Input Bias Current V
AI
= 0.85V
l
±1 ±25 nA
AO Pin Sink Current V
AI
= 0.6V, V
AO
= 1.5V 1.0 1.8 2.5 mA
AO Pin Voltage V
AI
= 0.6V, I
AO
= 1mA 0.8 1.2 V
Switching Regulators
FB1, FB2 Voltage
l
0.784 0.805 0.826 V
FB1, FB2 Voltage Line Regulation V
MAX
= 3V to 5V 0.01 %/V
FB1, FB2 Voltage Burst Mode Hysteresis V
MODE
= 2V 8 mV
FB1, FB2 Pin Input Bias Current V
FB1
= V
FB2
= 0.85V
l
±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
Switcher 2
450
700
600
900
850
1300
mA
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 V
USB
= 5V 0.5 Ω
USB Current Limit V
USB
= 5V, V
USBHP
= 2V
V
USB
= 5V, V
USBHP
= 0V
l
l
440
60
475
80
500
100
mA
mA
USB Suspend Mode Bias Current V
USB
= 5V, V
SUSPEND
= 2V 4 20 μA
SUSPEND Pin Threshold 0.8 1.1 V
USBHP Pin Threshold 0.8 1.1 V
SUSPEND Pin Pulldown Current V
SUSPEND
= 0.5V 2.5 μA
USBHP Pin Pulldown Current V
USBHP
= 0.5V 2.5 μA
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
BAT
= 3.6V, V
MAX
= 3.6V, V
PWRON
= 2V, V
ON
is open, V
ON2
= 0V,
V
USB
= 0V, V
WALLFB
= 0V unless otherwise noted.