LTC3455 Datasheet, PDF (4/24 Pages) Linear Technology – Dual DC/DC Converter with USB Power Manager and Li-Ion Battery Charger

LTC3455
ELECTRICAL CHARACTERISTICS The q 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_ON = 0V,
V_USB = 0V, V_WALLFB = 0V unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Battery Charger
Regulated Charger V_BAT Voltage
Charger Current Limit (USB Powered)
Charger Current Limit (Wall Powered)
Recharge Battery Voltage Threshold
Trickle Charge Trip Threshold
Trickle Charge Trip Hysteresis
Trickle Charge Current
PROG Pin Current
PROG Pin Voltage
CHRG Pin Output Low Voltage
Timer Accuracy
Junction Temperature in
Constant Temperature Mode
0°C ≤ T_A ≤ 85°C
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
R_PROG=2.49kΩ, V_MAX = 4.5V, 0°C ≤ T_A ≤ 85°C
V_{BAT(REGULATED)} – V_RECHARGE
Battery Voltage Rising
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
4.158 4.200 4.242
V
400 470
mA
50
90
mA
425 500 575
mA
150
mV
2.85
V
60
mV
65
mA
2
µA
1.23
V
0.75
V
±10
%
105
°C
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC3455 is guaranteed to meet specified performance from
0°C to 70°C and is designed, characterized and expected to meet these
extended temperature limits, but is not 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 PERFOR A CE 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
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
3455f
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