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LT3508EFE-TRPBF 数据表(PDF) 3 Page - Linear Technology

部件名 LT3508EFE-TRPBF
功能描述  Dual Monolithic 1.4A Step-Down Switching Regulator
Download  24 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LT3508EFE-TRPBF 数据表(HTML) 3 Page - Linear Technology

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LT3508
3
3508fb
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VBOOST = 17V unless otherwise noted. (Note 2)
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 LT3508E is guaranteed to meet performance specifications
from 0°C to 125°C junction temperature. Specifications over the –40°C
to 125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LT3508I is guaranteed over the full –40°C to 125°C operating junction
temperature range. The LT3508H is guaranteed over the full –40°C to
150°C operating junction temperature range. High junction temperatures
degrade operating lifetimes. Operating lifetime is derated at junction
temperatures greater than 125°C.
Note 3: Current flows out of pin.
Note 4: VBOOST =12V. Circuitry increases the maximum duty cycle of the
LT3508 when VBOOST > VIN + 2.5V. See “Minimum Operating Voltage” in
the Applications Information section for details.
Note 5: Current limit is guaranteed by design and/or correlation to static
test. Slope compensation reduces current limit at higher duty cycles.
Note 6: Current flows into pin.
Note 7: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed the maximum operating junction temperature
range when overtemperature protection is active. Continuous operation
above the specified maximum operating junction temperature may impair
device reliability.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Minimum Operating Voltage, VIN1
l
3.4
3.7
V
Minimum Operating Voltage, VIN2
VIN1 = 12V
l
2.5
3.0
V
VIN1 Quiescent Current
Not Switching
4.3
5.2
mA
VIN2 Quiescent Current
Not Switching
320
500
μA
Shutdown Current (VIN1 + VIN2)VSHDN = 0.3V
0.1
2
μA
FB Voltage
l
0.790
0.784
0.800
0.814
0.816
V
V
FB Pin Bias Current (Note 3)
VFB = 0.800V, VC = 0.4V
l
50
300
nA
FB Voltage Line Regulation
5V < VIN < 40V
0.01
%/V
Error Amp Transconductance
300
μS
Error Amp Voltage Gain
600
V/V
VC to Switch Current Gain
2.5
A/V
Switching Frequency
RT = 33.2k
l
0.92
1
1.06
MHz
Switching Phase
RT = 33.2k
150
180
210
Deg
Maximum Duty Cycle (Note 4)
RT = 33.2k
RT = 7.50k
RT = 169k
l
84
90
80
98
%
%
%
Foldback Frequency
RT = 33.2k, VFB = 0V
120
kHz
Switch Current Limit (Note 5)
Duty Cycle = 15%
l
2.0
2.6
3.2
A
Switch VCESAT
ISW = 1.5A
300
mV
Switch Leakage Current
0.01
1
μA
Minimum Boost Voltage
1.7
2.5
V
Boost Pin Current
ISW = 1.5A
35
50
mA
TRACK/SS Pin Current
VTRACK/SS = 0V
0.8
1.2
2.2
μA
PG Threshold Offset
VFB Rising
56
75
110
mV
PG Voltage Output Low
VFB = 0.6V, IPG = 250μA
0.13
0.4
V
PG Pin Leakage
VPG = 2V
0.01
1
μA
SHDN Threshold Voltage
2.53
2.63
2.73
V
SHDN Input Current (Note 6)
VSHDN = 60mV Above Threshold Voltage
6
8
10
μA
SHDN Threshold Current Hysteresis
5.5
7.5
9.5
μA
SYNC Threshold Voltage
1
1.25
1.5
V
SYNC Input Frequency
0.25
2.5
MHz


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