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LT8331 Datasheet(HTML) 3 Page - Analog Devices

Part No. LT8331
Description  Low IQ Boost/SEPIC/Flyback/Inverting Converter with 0.5A, 140V Switch
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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LT8331 Datasheet(HTML) 3 Page - Analog Devices

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LT8331
3
Rev. C
For more information www.analog.com
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, EN/UVLO = 12V unless otherwise noted.
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: INTVCC cannot be externally driven. No external loading is allowed
on this pin.
Note 3: The LT8331E 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
LT8331I is guaranteed over the full –40°C to 125°C operating junction
temperature range. High junction temperatures degrade operating
lifetimes. Operating lifetime is derated at junction temperatures greater
than 125°C.
Note 4: The IC includes overtemperature protection that is intended to
protect the device during overload conditions. Junction temperature will
exceed 150°C when overtemperature protection is active. Continuous
operation above the specified maximum operating junction temperature
will reduce lifetime.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
BIAS Threshold
Rising, BIAS Can Supply INTVCC
Falling, BIAS Cannot Supply INTVCC
l
l
4.10
3.725
4.4
4
4.65
4.275
V
V
VIN Falling Threshold to Supply INTVCC
BIAS = 12V
BIAS – 1.6V
V
BIAS Falling Threshold to Supply INTVCC
VIN = 12V
VIN – 0.4V
V
FBX Regulation
FBX Regulation Voltage
FBX > 0V
FBX < 0V
l
l
1.568
–0.820
1.6
–0.80
1.632
–0.780
V
V
FBX Line Regulation
FBX > 0V, 4.5V < VIN < 100V
FBX < 0V, 4.5V < VIN < 100V
0.005
0.005
0.015
0.015
%/V
%/V
FBX Pin Current
FBX = 1.6V, –0.8V
l
–10
10
nA
Oscillator
Switching Frequency (fOSC)
RT = 301k
RT = 100k
RT = 56.2k
l
l
l
92
279
465
100
300
500
107
321
535
kHz
kHz
kHz
Minimum On-Time
SYNC = 0V
SYNC = INTVCC
165
160
290
290
ns
ns
Minimum Off-Time
146
230
ns
SYNC/Mode, Mode Thresholds
Rising to Select Pulse Skipping Mode
Falling to Select Burst Mode Operation
l
l
0.6
2.4
V
V
SYNC/Mode, Clock Thresholds
Rising
Falling
0.6
2.0
1.1
2.4
V
V
fSYNC/fOSC Allowed Ratio
RT = 100k
0.95
1
1.25
kHz
SYNC Pin Current
SYNC = 2V
–40
40
nA
Switch
Maximum Switch Current Limit Threshold
l
0.5
0.6
0.7
A
Switch Overcurrent Threshold
Discharges SS Pin
1.15
A
Switch RDS(ON)
ISW = 0.25A
1.7
Ω
Switch Leakage Current
VSW = 140V
0.1
1
µA
EN/UVLO Logic
EN/UVLO Pin Threshold (Rising)
Start Switching
l
1.576
1.74
1.90
V
EN/UVLO Pin Threshold (Falling)
Stop Switching
l
1.556
1.6
1.644
V
EN/UVLO Pin Current
VEN/UVLO = 1.6V
l
–40
40
nA
Soft-Start
Soft-Start Charge Current
SS = 1V
2
µA
Soft-Start Pull-Down Resistance
Fault Condition, SS = 0.1V
250
Ω


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