LTC3458L Просмотр технического описания (PDF) - Linear Technology
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LTC3458L Datasheet PDF : 16 Pages
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LTC3458L
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 3.3V, VOUT = 5V, RT = 200k, unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Error Amplifier Sink Current
7
μA
SYNC Input High
● 1.5
V
SYNC Input Low
●
0.35
V
SHDN Input High
● 1.25
V
SHDN Input Low
●
0.3
V
BURST Mode Peak Current (IBURSTPEAK)
BURST Threshold Voltage
RILIM = 84.5k
0.55
A
1.10
V
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: 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.
Note 3: The LTC3458LE is guaranteed to meet performance 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.
TYPICAL PERFOR A CE CHARACTERISTICS (TA = 25°C unless otherwise specified)
ILIMIT, IBURSTPEAK, IZERO Currents
2200
2000
1800
ILIMIT
1600
1400
1200
1000
VOUT = 5V
L = 7.4μH
RLIM = 84.5k
800
600
IBURSTPEAK
400
200 IZERO
0
–200
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
VIN (V)
3458L G01
Typical Burst Mode Threshold and
Hysteresis vs RBURST
160
140
120
OUT OF
100
BURST
80 INTO
BURST
60
40
20
0
50 100 150 200 250 300
RBURST (kΩ)
3458L G04
Current Limit Accuracy
2.25
RILIMIT = 84.5k
2.15
2.05
1.95
1.85
–45 –30 –15 0 15 30 45 60 75 90
TEMPERATURE (°C)
3458L G02
Maximum Load Current in Burst
300
RILIM = 84.5k
250
3.3VOUT
200
5VOUT
150
100
50
0
1.5 2.0 2.5 3.0 3.5 4.0 4.5
VIN (V)
3458L G05
Burst Mode Quiescent Current
20
VIN = 3.3V
VOUT = 5V
15
IVIN
10
5
IVOUT
0
–40
–15 10
35
60
85
TEMPERATURE (°C)
3458L G03
Oscillator Programming Resistor
600
550
500
450
400
350
300
250
200
150
100
400
600 800 1000 1200 1400
OSCILLATOR FREQUENCY (kHz)
3458L G06
3458lfa
3
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