LTC3455_15 Datasheet, PDF (4/28 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 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.
PARAMETER
CONDITIONS
MIN
TYP
MAX
Hot Swap Output
UNITS
Hot Swap PMOS Switch On-Resistance
Hot Swap PMOS Switch Current Limit
HSON Pin Threshold
V_HSI = 3.3V
V_HSI = 3.3V, V_HSO = 2.5V
0.9
Ω
120
160
mA
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 4.200 4.242
V
4.058
4.1
4.142
V
Charger Current Limit (USB Powered) R_PROG = 2.49kΩ, V_USBHP = 2V, V_USB = 5V, 0°C ≤ T_A ≤ 85°C
400
470
mA
R_PROG = 2.49kΩ, V_USBHP = 0V, V_USB = 5V, 0°C ≤ T_A ≤ 85°C
425
50
90
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
PROG Pin Current
PROG Pin Voltage
CHRG Pin Output Low Voltage
Timer Accuracy
Junction Temperature in Constant
Temperature Mode
R_PROG = 2.49kΩ, V_BAT = 2V
Internal Pull-Up Current, No R_PROG
R_PROG = 2.49kΩ
I_CHRG = 5mA
C_TIMER = 0.1μF
65
mA
2
μA
1.23
V
0.75
V
±10
%
105
°C
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 specified
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
120
BOTH SWITCHERS ENABLED
100
ONLY SWITCHER 1 ENABLED
80
60
40
20
V_BAT = 3.6V
NOT SWITCHING
0
–50 –25 0 25 50 75
TEMPERATURE (°C)
100 125
3455 G01
PWM Mode Quiescent Current
600
BOTH SWITCHERS ENABLED
500
400
ONLY SWITCHER 1 ENABLED
300
200
100
V_BAT = 3.6V
NOT SWITCHING
0
–50 –25 0 25 50 75
TEMPERATURE (°C)
100 125
3455 G02
4
Shutdown Quiescent Current
5
V_BAT = 3.6V
4
3
2
1
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3455 G03
3455fc