LT3481I Просмотр технического описания (PDF) - Linear Technology
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LT3481I Datasheet PDF : 24 Pages
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LT3481
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 10V, VRUNS/SS = 10V VBOOST = 15V, VBIAS = 3.3V unless otherwise
noted. (Note 2)
PARAMETER
Minimum Input Voltage
Quiescent Current from VIN
Quiescent Current from BIAS
Minimum Bias Voltage
Feedback Voltage
FB Pin Bias Current (Note 3)
FB Voltage Line Regulation
Error Amp GM
Error Amp Gain
VC Source Current
VC Sink Current
VC Pin to Switch Current Gain
VC Clamp Voltage
Switching Frequency
Minimum Switch Off-Time
Switch Current Limit
Switch VCESAT
Boost Schottky Reverse Leakage
Minimum Boost Voltage (Note 4)
BOOST Pin Current
RUN/SS Pin Current
RUN/SS Input Voltage High
RUN/SS Input Voltage Low
PG Threshold Offset from Feedback Voltage
PG Hysteresis
PG Leakage
PG Sink Current
CONDITIONS
VRUN/SS = 0.2V
VBIAS = 3V, Not Switching
VBIAS = 0, Not Switching
VRUN/SS = 0.2V
VBIAS = 3V, Not Switching
VBIAS = 0, Not Switching
VFB = 1.25V, VC = 0.4V
4V < VIN < 34V
RT = 8.66k
RT = 29.4k
RT = 187k
Duty Cycle = 5%
ISW = 2A
VSW = 10V, VBIAS = 0V
ISW = 1A
VRUN/SS = 2.5V
VFB Rising
VPG = 5V
VPG = 3V
MIN
●
●
●
1.25
● 1.24
●
2.5
1.25
250
●
3.2
●
2.5
● 100
TYP MAX
3
3.6
0.01 0.5
22
60
75
120
0.01 0.5
50
120
0
5
2.7
3
1.265 1.29
1.265 1.3
30
100
0.002 0.02
330
800
65
85
3.5
2
2.8
3.1
1.4 1.55
300 350
130 200
3.8
4.4
360
0.02
2
1.5
2.1
18
35
5
10
0.2
122
5
0.1
1
600
UNITS
V
μA
μA
μA
μA
μA
μA
V
V
V
nA
%/V
μMho
μA
μA
A/V
V
MHz
MHz
kHz
nS
A
mV
μA
V
mA
μA
V
V
mV
mV
μA
μA
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 LT3481E is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LT3481I specifications are
guaranteed over the –40°C to 125°C temperature range. The LT3481H
specifications are guaranteed over the –40°C to 150°C operating
temperature range. High junction temperatures degrade operating
lifetimes. Operating lifetime is derated at junction temperatures greater
than 125°C.
Note 3: Bias current flows into the FB pin.
Note 4: This is the minimum voltage across the boost capacitor needed
to guarantee full saturation of the switch.
3481fb
3
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