LTC3577-4_15 Datasheet, PDF (10/52 Pages) Linear Technology – Highly Integrated Portable Product PMIC

LTC3577-3/LTC3577-4
ELECTRICAL CHARACTERISTICS
Note 6: h_C/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 specified 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: V_OUT 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 specified output
current. When an LDO is in dropout, its output voltage will be equal to
V_IN – V_DROP.
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: I_{VOUT_LED} is the sum of V_OUT and V_IN3 current due to LED driver.
Note 15: The I_BATQ specifications represent the total battery load assuming
V_INLDO1, V_INLDO2, V_IN12 and V_IN3 are tied directly to V_OUT.
Note 16: Long-term current density rating for the part.
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C unless otherwise specified
Input Supply Current
vs Temperature
0.8
V_BUS = 5V
0.7 ^{1x MODE}
0.6
0.5
0.4
0.3
0.2
0.1
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
357734 G01
Input Current Limit
vs Temperature
1200
1100
1000
V_BUS = 5V
R_CLPROG = 2.1k
10x MODE
900
800
700
600
5x MODE
500
400
300
200
100
1x MODE
0
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
357734 G04
Input Supply Current
vs Temperature (Suspend Mode)
0.10
V_BUS = 5V
0.08
0.06
0.04
0.02
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
357734 G02
Input R_ON vs Temperature
300
I_OUT = 400mA
280
260
240
V_BUS = 4.5V
220
V_BUS = 5V
180
160
V_BUS = 5.5V
140
120
100
0
–50 –25
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
V_BAT = 3.8V
250
V_BUS = 0V
200
ALL SUPPLIES ENABLED
(EXCEPT BOOST)
150 ^{Burst Mode OPERATION}
100
50
ALL SUPPLIES DISABLED EXCEPT LDO1
0
–50 –25 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
R_PROG = 2k
0
–50 –25 0 25 50 75
TEMPERATURE (°C)
100 125
357734 G06
357734fb