Boost/SEPIC/Flyback/Inverting Converter. LT8331 Datasheet

LT8331 Converter. Datasheet pdf. Equivalent

LT8331 Datasheet
Recommendation LT8331 Datasheet
Part LT8331
Description Boost/SEPIC/Flyback/Inverting Converter
Feature LT8331; FEATURES LT8331 Low IQ Boost/SEPIC/ Flyback/Inverting Converter with 0.5A, 140V Switch DESCRIPTION .
Manufacture Linear
Datasheet
Download LT8331 Datasheet




Linear LT8331
FEATURES
LT8331
Low IQ Boost/SEPIC/
Flyback/Inverting Converter
with 0.5A, 140V Switch
DESCRIPTION
nn Wide Input Voltage Range: 4.5V to 100V
nn Ultralow Quiescent Current and Low Ripple
Burst Mode® Operation: IQ = 6µA
nn 0.5A, 140V Power Switch
nn Positive or Negative Output Voltage Programming
with a Single Feedback Pin
nn Programmable Frequency (100kHz to 500kHz)
nn Synchronizable to an External Clock
nn BIAS Pin for Higher Efficiency
nn Programmable Undervoltage Lockout (UVLO)
nn Thermally-Enhanced High Voltage MSOP Package
APPLICATIONS
nn Industrial and Automotive
nn Telecom
nn Medical Diagnostic Equipment
nn Portable Electronics
The LT®8331 is a current mode DC/DC converter with a
140V, 0.5A switch operating from a 4.5V to 100V input.
With a unique single feedback pin architecture, it is ca-
pable of boost, SEPIC, flyback or inverting configurations.
Burst Mode operation consumes as low as 6μA quiescent
current to maintain high efficiency at very low output cur-
rents, while keeping typical output ripple below 20mV.
The internally-compensated current mode architecture
results in stable operation over a wide range of input and
output voltages and programmable switching frequencies
between 100kHz to 500kHz. A SYNC/MODE pin allows
synchronization to an external clock. It can also be used to
select between burst or pulse-skipping modes of operation.
For increased efficiency, a BIAS pin can accept a second
input to supply the INTVCC regulator. Additional features
include frequency foldback and programmable soft-start
for controlling inductor current during start-up.
The LT8331 is available in a thermally-enhanced MSOP
package with four pins removed for high voltage spacings.
L, LT, LTC, LTM, Linear Technology, the Linear logo, and Burst Mode are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
TYPICAL APPLICATION
VIN
36V TO
72V
1µF
×2 1M
48V Output SEPIC Converter
220μH
2.2µF
VIN SW1-2
LT8331
EN/UVLO
220μH
SYNC/MODE
FBX
GND
BIAS
VOUT
59k
RT SS INTVCC
63.4k
0.1µF
1µF
450kHz
4.7µF
×4
VOUT = 48V
150mA AT VIN = 36V
165mA AT VIN = 48V
190mA AT VIN = 72V
1M
34.8k
8331 TA01a
For more information www.linear.com/LT8331
100
90
80
70
60
50
40
30
20
10
0
0
Efficiency and Power Loss
2.0
EFFICIENCY
POWER LOSS
1.5
1.0
0.5
VIN = 36V
VIN = 48V
VIN = 72V
0
50 100 150 200
LOAD CURRENT (mA)
8331 TA01b
8331fa
1



Linear LT8331
LT8331
ABSOLUTE MAXIMUM RATINGS
(Note 1)
SW........................................................................... 140V
VIN, EN/UVLO...........................................................100V
BIAS...........................................................................60V
EN/UVLO Pin Above VIN Pin, SYNC.............................6V
INTVCC (Note 2)...........................................................4V
FBX............................................................................±4V
Operating Junction Temperature (Note 3)
LT8331E, LT8331I............................... –40°C to 125°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................... 300°C
PIN CONFIGURATION
EN/UVLO 1
TOP VIEW
16 SW1
VIN 3
INTVNCCC
5
6
BIAS 7
NC 8
17
PGND,
GND
14 SW2
12 SYNC/MODE
11 SS
10 RT
9 FBX
MSE PACKAGE
VARIATION: MSE16 (12)
16-LEAD PLASTIC MSOP
θJA = 45°C/W, θJC = 10°C/W
EXPOSED PAD (PIN 17) IS PGND AND GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION http://www.linear.com/product/LT8331#orderinfo
LEAD FREE FINISH
TAPE AND REEL
PART MARKING* PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT8331EMSE#PBF
LT8331EMSE#TRPBF 8331
16-Lead Plastic MSOP with 4 Pins Removed –40°C to 125°C
LT8331IMSE#PBF
LT8331IMSE#TRPBF
8331
16-Lead Plastic MSOP with 4 Pins Removed –40°C to 125°C
Consult LTC® Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/. Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
E LECTRICAL 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.
PARAMETER
CONDITIONS
MIN TYP MAX
VIN Operating Voltage Range
VIN Quiescent Current at Shutdown
VEN/UVLO = 0.2V
l 4.5
100
12
l 25
VEN/UVLO = 1.5V
2.0 5
l 3.6 9.5
VIN Quiescent Current
Sleep Mode (Not Switching)
RT = 100k
SYNC = 0V
5.5 15
l 8.5 25
Active Mode (Not Switching)
SYNC = 0V, BIAS = 0V
780 1420
l 840 1720
SYNC = 0V, BIAS = 5V
17 40
l 24 55
SYNC = INTVCC, BIAS = 0V
l
700 1080
800 1170
SYNC = INTVCC, BIAS = 5V
l
17 40
24 55
UNITS
V
μA
μA
μA
μA
μA
μA
µA
µA
µA
µA
µA
µA
µA
µA
8331fa
2 For more information www.linear.com/LT8331



Linear LT8331
LT8331
E LECTRICAL 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.
PARAMETER
BIAS Threshold
VIN Falling Threshold to Supply INTVCC
BIAS Falling Threshold to Supply INTVCC
FBX Regulation
FBX Regulation Voltage
FBX Line Regulation
FBX Pin Current
Oscillator
Switching Frequency (fOSC)
Minimum On-Time
Minimum Off-Time
SYNC/Mode, Mode Thresholds
SYNC/Mode, Clock Thresholds
fSYNC/fOSC Allowed Ratio
SYNC Pin Current
Switch
Maximum Switch Current Limit Threshold
Switch Overcurrent Threshold
Switch RDS(ON)
Switch Leakage Current
EN/UVLO Logic
EN/UVLO Pin Threshold (Rising)
EN/UVLO Pin Threshold (Falling)
EN/UVLO Pin Current
Soft-Start
Soft-Start Charge Current
Soft-Start Pull-Down Resistance
CONDITIONS
Rising, BIAS Can Supply INTVCC
Falling, BIAS Cannot Supply INTVCC
BIAS = 12V
VIN = 12V
FBX > 0V
FBX < 0V
FBX > 0V, 4.5V < VIN < 100V
FBX < 0V, 4.5V < VIN < 100V
FBX = 1.6V, –0.8V
RRRTTT
=
=
=
301k
100k
56.2k
SYNC = 0V
SYNC = INTVCC
Rising to Select Pulse Skipping Mode
Falling to Select Burst Mode Operation
Rising
Falling
RT = 100k
SYNC = 2V
Discharges SS Pin
ISW = 0.25A
VSW = 140V
Start Switching
Stop Switching
VEN/UVLO = 1.6V
SS = 1V
Fault Condition, SS = 0.1V
MIN TYP MAX
l 4.10 4.4 4.65
l 3.725 4 4.275
BIAS – 1.6V
VIN – 0.4V
l 1.568
l –0.820
l –10
1.6
–0.80
0.005
0.005
1.632
–0.780
0.015
0.015
10
l 92
100 107
l 279 300 321
l 465 500 535
165 290
160 290
146 230
l
l 0.6
2.4
2.0 2.4
0.6 1.1
0.95 1 1.25
–40 40
l 0.5 0.6 0.7
1.15
1.7
0.1 1
l 1.576
1.74
1.90
l 1.556 1.6 1.644
l –40
40
2
250
UNITS
V
V
V
V
V
V
%/V
%/V
nA
kHz
kHz
kHz
ns
ns
ns
V
V
V
V
kHz
nA
A
A
Ω
µA
V
V
nA
µA
Ω
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.
For more information www.linear.com/LT8331
8331fa
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