LTC3455/LTC3455-1
4
3455fc
ELECTRICAL CHARACTERISTICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
Hot Swap Output
Hot Swap PMOS Switch On-Resistance V
HSI
= 3.3V 0.9 Ω
Hot Swap PMOS Switch Current Limit V
HSI
= 3.3V, V
HSO
= 2.5V 120 160 mA
HSON Pin Threshold 0.8 1.1 V
HSON Pin Pulldown Current 2.5 μA
Battery Charger
Regulated Charger V
BAT
Voltage 0°C ≤ T
A
≤ 85°C (LTC3455)
0°C ≤ T
A
≤ 85°C (LTC3455-1)
4.158
4.058
4.200
4.1
4.242
4.142
V
V
Charger Current Limit (USB Powered) R
PROG
= 2.49kΩ, V
USBHP
= 2V, V
USB
= 5V, 0°C ≤ T
A
≤ 85°C
R
PROG
= 2.49kΩ, V
USBHP
= 0V, V
USB
= 5V, 0°C ≤ T
A
≤ 85°C 425
400
50
470
90
mA
mA
Charger Current Limit (Wall Powered) R
PROG
= 2.49kΩ, V
MAX
= 4.5V, 0°C ≤ T
A
≤ 85°C 500 575 mA
Recharge Battery Voltage Threshold V
BAT(REGULATED)
– V
RECHARGE
150 mV
Trickle Charge Trip Threshold Battery Voltage Rising 2.85 V
Trickle Charge Trip Hysteresis 60 mV
Trickle Charge Current R
PROG
= 2.49kΩ, V
BAT
= 2V 65 mA
PROG Pin Current Internal Pull-Up Current, No R
PROG
2μA
PROG Pin Voltage R
PROG
= 2.49kΩ 1.23 V
CHRG Pin Output Low Voltage I
CHRG
= 5mA 0.75 V
Timer Accuracy C
TIMER
= 0.1μF ±10 %
Junction Temperature in Constant
Temperature Mode
105 °C
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.
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3455/LTC3455-1 are guaranteed to meet specifi ed
performance from 0°C to 85°C and is designed, characterized and
expected to meet these extended temperature limits, but is not 100%
tested at –40°C and 85°C.
Note 3: Quiescent current is pulled from the V
BAT
pin when neither USB
or wall power is present, and from the V
MAX
pin when either USB or Wall
power is present.
TYPICAL PERFORMANCE CHARACTERISTICS
Burst Mode Quiescent Current PWM Mode Quiescent Current Shutdown Quiescent Current
TEMPERATURE (°C)
–50
QUIESCENT CURRENT (μA)
120
100
80
60
40
20
0
25 75
3455 G01
–25 0
50 100 125
V
BAT
= 3.6V
NOT SWITCHING
BOTH SWITCHERS ENABLED
ONLY SWITCHER 1 ENABLED
TEMPERATURE (°C)
–50
QUIESCENT CURRENT (μA)
600
500
400
300
200
100
0
25 75
3455 G02
–25 0
50 100 125
BOTH SWITCHERS ENABLED
ONLY SWITCHER 1 ENABLED
V
BAT
= 3.6V
NOT SWITCHING
TEMPERATURE (°C)
–50
QUIESCENT CURRENT (μA)
5
4
3
2
1
0
25 75
3455 G03
–25 0
50 100 125
V
BAT
= 3.6V
