LTC1875 Просмотр технического описания (PDF) - Linear Technology
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LTC1875 Datasheet PDF : 20 Pages
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LTC1875
ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full operating
temperature range, otherwise specifications are TA = 25°C. VIN = 3.6V unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VRUN
IRUN
RUN Threshold
RUN Input Current
VRUN Ramping Up
VRUN = 0V
q 0.2
0.7
1.5
V
±0.01 ±1
µA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC1875E is guaranteed to meet specified performance from
0°C to 70°C. Specifications over the – 40°C to 85°C operating temperature
range are assured by design, characterization and correlation with
statistical process controls.
Note 3: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formula:
LTC1875: TJ = TA + (PD • 110°C/W)
Note 4: The LTC1875 is tested in a feedback loop which servos VFB to the
balance point for the error amplifier (VITH = 1.2V)
Note 5: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
Note 6: This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
TYPICAL PERFOR A CE CHARACTERISTICS
RDS(ON) vs Temperature
0.8
SYNCHRONOUS SWITCH
0.7
MAIN SWITCH
VIN = 3V
0.6
0.5
VIN = 5V
0.4
0.3
0.2
VIN = 3V VIN = 5V
0.1
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1875 G01
DC Supply Current
vs Temperature
300
VIN = 3.6V
250
PULSE SKIPPING MODE
200
150
100
50
0
–50
BURST MODE
0
50
TEMPERATURE (°C)
100 125
1875 G04
Oscillator Frequency
vs Temperature
595
VIN = 3.6V
575
555
535
515
495
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1875 G02
RDS(ON) vs Input Voltage
0.6
0.5
SYNCHRONOUS SWITCH
0.4
0.3
0.2
MAIN SWITCH
0.1
0
0
2
4
6
8
INPUT VOLTAGE (V)
1875 G05
Oscillator Frequency
vs Supply Voltage
580
570
560
550
540
530
0
2
4
6
SUPPLY VOLTAGE (V)
8
1875 G03
Switch Leakage Current
vs Temperature
10
9
VIN = 7V
RUN = 0V
8
7
6
MAIN SWITCH
5
4
3
2
SYNCHRONOUS SWITCH
1
0
–50
0
50
100 125
TEMPERATURE (°C)
1875 G06
1875f
3
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