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LTC3454 Datenblatt(PDF) 3 Page - Linear Technology

Teilenummer LTC3454
Bauteilbeschribung  1A Synchronous Buck-Boost High Current LED Driver
PDF  12 Pages
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Hersteller  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3454 Datenblatt(HTML) 3 Page - Linear Technology

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LTC3454
3
3454fa
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
Enable Thresholds
vs Temperature
Enable Thresholds vs VIN
ISET1,2 Servo Voltage
vs Temperature
ISET1,2 Servo Voltage vs VIN
ISET1,2 Servo Voltage vs RISET
TEMPERATURE (°C)
–55
1.4
1.5
1.7
1.8
1.9
2.4
2.1
–15
25
45
125
3454 G01
1.6
2.2
2.3
2.0
–35
5
65
85 105
VIN RISING
VIN FALLING
TEMPERATURE (°C)
–55
200
300
500
600
700
1200
900
–15
25
45
125
3454 G02
400
1000
1100
800
–35
5
65
85 105
VIH
VIL
VIN = 3.6V
VIN (V)
2.7
200
300
500
600
700
1200
900
3.5
5.5
3454 G03
400
1000
1100
800
3.1
3.9
4.3
4.7
5.1
VIH
TA = 25°C
VIL
TEMPERATURE (°C)
–55
788
792
800
804
808
–15
25
45
125
3454 G04
796
–35
5
65
85 105
812
VIN = 3.6V
RISET1,2 = 15k
VIN (V)
2.7
804
808
812
3.9
4.7
3454 G05
800
796
3.1
3.5
4.3
5.1
5.5
792
788
TA = 25°C
RISET1 = RISET2 = 15k
RISET (kΩ)
3
804
808
812
15
23
3454 G06
800
796
711
19
27
31
792
788
VIN = 3.6V
TA = 25°C



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