LTC3454 Просмотр технического описания (PDF) - Linear Technology
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LTC3454 Datasheet PDF : 12 Pages
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LTC3454
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 3.6V, RISET = 20.5k unless otherwise noted. (Note 2)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Oscillator Frequency
0.9
1.0
1.15
MHz
Soft-Start Time
200
μs
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3454 is guaranteed to meet specifications 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:
TJ = TA + (PD • θJA °C/W).
Note 4: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
Note 5: This parameter is tested using a feedback loop which servos VC
to 1.8V.
TYPICAL PERFORMANCE CHARACTERISTICS
Undervoltage Lockout Threshold
vs Temperature
2.4
2.3
2.2
2.1
VIN RISING
2.0
1.9
1.8
1.7
VIN FALLING
1.6
1.5
1.4
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
3454 G01
ISET1,2 Servo Voltage
vs Temperature
812 VIN = 3.6V
RISET1,2 = 15k
808
804
800
796
792
788
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
3454 G04
Enable Thresholds
vs Temperature
1200
VIN = 3.6V
1100
1000
900
800
700
VIH
600
VIL
500
400
300
200
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
3454 G02
ISET1,2 Servo Voltage vs VIN
812
TA = 25°C
RISET1 = RISET2 = 15k
808
804
800
796
792
788
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
VIN (V)
3454 G05
Enable Thresholds vs VIN
1200
TA = 25°C
1100
1000
900
800
700
VIH
600
VIL
500
400
300
200
2.7 3.1 3.5 3.9 4.3 4.7
VIN (V)
5.1 5.5
3454 G03
ISET1,2 Servo Voltage vs RISET
812
VIN = 3.6V
TA = 25°C
808
804
800
796
792
788
37
11 15 19 23 27 31
RISET (kΩ)
3454 G06
3454fa
3
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