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参数资料
| 型号： | LT3508IFE#TR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 3.2 A DUAL SWITCHING CONTROLLER, 1060 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | 4.40 MM, PLASTIC, TSSOP-16 |
| 文件页数： | 18/24页 |
| 文件大小： | 365K |
| 代理商： | LT3508IFE#TR |
LT3508
3
3508f
ELECTRICAL CHARACTERISTICS
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Minimum Operating Voltage, VIN1
●
3.4
3.7
V
Minimum Operating Voltage, VIN2
VIN1 = 12V
●
2.5
3.0
V
VIN1 Quiescent Current
Not Switching
4.3
5.2
mA
VIN2 Quiescent Current
Not Switching
320
500
A
Shutdown Current (VIN1 + VIN2)VSHDN = 0.3V
0.1
2
A
FB Voltage
●
0.790
0.784
0.800
0.814
0.816
V
FB Pin Bias Current (Note 3)
VFB = 0.800V, VC = 0.4V
●
50
300
nA
FB Voltage Line Regulation
5V < VIN < 40V
0.01
%/V
Error Amp Transconductance
300
S
Error Amp Voltage Gain
600
V/V
VC to Switch Current Gain
2.5
A/V
Switching Frequency
RT = 33.2k
●
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
●
84
90
80
98
%
Foldback Frequency
RT = 33.2k, VFB = 0V
120
kHz
Switch Current Limit (Note 5)
Duty Cycle = 15%
●
2.0
2.6
3.2
A
Switch VCESAT
ISW = 1.5A
300
mV
Switch Leakage Current
0.01
1
A
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
A
PG Threshold Offset
VFB Rising
56
75
110
mV
PG Voltage Output Low
VFB = 0.6V, IPG = 250A
0.13
0.4
V
PG Pin Leakage
VPG = 2V
0.01
1
A
SHDN Threshold Voltage
2.53
2.63
2.73
V
SHDN Input Current (Note 6)
VSHDN = 60mV Above Threshold Voltage
6
8
10
A
SHDN Threshold Current Hysteresis
5.5
7.5
9.5
A
SYNC Threshold Voltage
1
1.25
1.5
V
SYNC Input Frequency
0.25
2.5
MHz
The
● denotes the specications which apply over the full operating
temperature range, otherwise specications 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 specications
from 0°C to 125°C. Specications 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
to meet performance specications over the –40°C to 125°C operating
junction temperature range.
Note 3: Current ows 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 ows into pin.
Note 7: 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 specied maximum operating junction
temperature may impair device reliability.
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| LT3508IFE-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Monolithic 1.4A Step-Down Switching Regulator |
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