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LTC3577-3 Datasheet, PDF (10/52 Pages) Linear Technology – Highly Integrated Portable Product PMIC | |||
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LTC3577-3/LTC3577-4
ELECTRICAL CHARACTERISTICS
Note 5: Total input current is the sum of quiescent current, IBUSQ, and
measured current given by VCLPROG/RCLPROG ⢠(hCLPROG + 1).
Note 6: hC/10 is expressed as a fraction of measured full charge current
with indicated PROG resistor.
Note 7: The current limit features of this part are intended to protect the
IC from short term or intermittent fault conditions. Continuous operation
above the maximum speciï¬ed pin current rating may result in device
degradation or failure.
Note 8: The serial port is tested at rated operating frequency. Timing
parameters are tested and/or guaranteed by design.
Note 9: VOUT not in UVLO.
Note 10: Buck FB high, not switching.
Note 11: Measured with the LDO running unity gain with output tied to
feedback pin.
Note 12: Dropout voltage is the minimum input to output voltage
differential needed for an LDO to maintain regulation at a speciï¬ed output
current. When an LDO is in dropout, its output voltage will be equal to
VIN â VDROP.
Note 13: PGOOD threshold is expressed as a percentage difference
from the Buck1, Buck2 and LDO1 regulation voltages. The threshold is
measured from Buck1, Buck2 and LDO1 output rising.
Note 14: IVOUT_LED is the sum of VOUT and VIN3 current due to LED driver.
Note 15: The IBATQ speciï¬cations represent the total battery load assuming
VINLDO1, VINLDO2, VIN12 and VIN3 are tied directly to VOUT.
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise speciï¬ed
Input Supply Current vs
Temperature
0.8
VBUS = 5V
0.7 1x MODE
0.6
0.5
0.4
0.3
0.2
0.1
0
â50 â25
0 25 50 75
TEMPERATURE (°C)
100 125
357734 G01
Input Current Limit vs
Temperature
1200
1100
1000
VBUS = 5V
RCLPROG = 2.1k
10x MODE
900
800
700
600
500
5x MODE
400
300
200
1x MODE
100
0
â50 â25
0 25 50 75 100 125
TEMPERATURE (°C)
357734 G04
Input Supply Current vs
Temperature (Suspend Mode)
0.10
VBUS = 5V
0.08
0.06
0.04
0.02
0
â50 â25
0 25 50 75
TEMPERATURE (°C)
100 125
357734 G02
Input RON vs Temperature
300
IOUT = 400mA
280
260
240
VBUS = 4.5V
220
VBUS = 5V
180
160
VBUS = 5.5V
140
120
100
0
â50 â25
0 25 50 75 100 125
TEMPERATURE (°C)
357734 G05
10
Battery Drain Current vs
Temperature
450
ALL SUPPLIES ENABLED (EXCEPT BOOST)
400
PULSE-SKIP MODE
350
NO LOAD ON
ALL SUPPLIES
300
VBAT = 3.8V
250
VBUS = 0V
200
ALL SUPPLIES ENABLED
(EXCEPT BOOST)
150 Burst Mode OPERATION
100
50
ALL SUPPLIES DISABLED EXCEPT LDO1
0
â50 â25 0 25 50 75 100 125
TEMPERATURE (°C)
357734 G03
Charge Current vs Temperature
(Thermal Regulation)
600
500
400
300
200
100 VBUS = 5V
10x MODE
RPROG = 2k
0
â50 â25 0 25 50 75
TEMPERATURE (°C)
100 125
357734 G06
357734fa
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