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LTC3455 Datasheet(PDF) 4 Page - Linear Technology

Part # LTC3455
Description  Dual DC/DC Converter with USB Power Manager and Li-Ion Battery Charger
PDF  24 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3455 Datasheet(HTML) 4 Page - Linear Technology

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LTC3455
4
3455f
ELECTRICAL CHARACTERISTICS The q 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, VON = 0V,
VUSB = 0V, VWALLFB = 0V unless otherwise noted.
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 VBAT pin when neither USB or
wall power is present, and from the VMAX pin when either USB or Wall
power is present.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Battery Charger
Regulated Charger VBAT Voltage
0
°C ≤ TA ≤ 85°C
4.158
4.200
4.242
V
Charger Current Limit (USB Powered)
RPROG=2.49kΩ, VUSBHP = 2V, VUSB = 5V, 0°C ≤ TA ≤ 85°C
400
470
mA
RPROG=2.49kΩ, VUSBHP = 0V, VUSB = 5V, 0°C ≤ TA ≤ 85°C50
90
mA
Charger Current Limit (Wall Powered)
RPROG=2.49kΩ, VMAX = 4.5V, 0°C ≤ TA ≤ 85°C
425
500
575
mA
Recharge Battery Voltage Threshold
VBAT(REGULATED) – VRECHARGE
150
mV
Trickle Charge Trip Threshold
Battery Voltage Rising
2.85
V
Trickle Charge Trip Hysteresis
60
mV
Trickle Charge Current
RPROG=2.49kΩ, VBAT = 2V
65
mA
PROG Pin Current
Internal Pull-Up Current, No RPROG
2
µA
PROG Pin Voltage
RPROG =2.49kΩ
1.23
V
CHRG Pin Output Low Voltage
ICHRG = 5mA
0.75
V
Timer Accuracy
CTIMER = 0.1µF
±10
%
Junction Temperature in
105
°C
Constant Temperature Mode
TYPICAL PERFOR A CE CHARACTERISTICS
Burst Mode Quiescent Current
PWM Mode Quiescent Current
Shutdown Quiescent Current
TEMPERATURE (
°C)
–50
120
100
80
60
40
20
0
25
75
3455 G01
–25
0
50
100
125
VBAT = 3.6V
NOT SWITCHING
BOTH SWITCHERS ENABLED
ONLY SWITCHER 1 ENABLED
TEMPERATURE (
°C)
–50
600
500
400
300
200
100
0
25
75
3455 G02
–25
0
50
100
125
BOTH SWITCHERS ENABLED
ONLY SWITCHER 1 ENABLED
VBAT = 3.6V
NOT SWITCHING
TEMPERATURE (
°C)
–50
5
4
3
2
1
0
25
75
3455 G03
–25
0
50
100
125
VBAT = 3.6V



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