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LT8331 Datasheet(HTML) 1 Page - Analog Devices

Part No. LT8331
Description  Low IQ Boost/SEPIC/Flyback/Inverting Converter with 0.5A, 140V Switch
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LT8331 Datasheet(HTML) 1 Page - Analog Devices

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LT8331
1
Rev. C
For more information www.analog.com
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TYPICAL APPLICATION
FEATURES
DESCRIPTION
Low IQ Boost/SEPIC/Flyback/Inverting
Converter with 0.5A, 140V Switch
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 capa-
ble 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 opera-
tion. 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.
48V Output SEPIC Converter
APPLICATIONS
n
Wide Input Voltage Range: 4.5V to 100V
n
Ultralow Quiescent Current and Low Ripple
Burst Mode® Operation: IQ = 6µA
n
0.5A, 140V Power Switch
n
Positive or Negative Output Voltage Programming
with a Single Feedback Pin
n
Programmable Frequency (100kHz to 500kHz)
n
Synchronizable to an External Clock
n
BIAS Pin for Higher Efficiency
n
Programmable Undervoltage Lockout (UVLO)
n
Thermally-Enhanced High Voltage MSOP Package
n
AEC-Q100 Qualified for Automotive Applications
n
Industrial and Automotive
n
Telecom
n
Medical Diagnostic Equipment
n
Portable Electronics
Efficiency and Power Loss
8331 TA01a
34.8k
2.2µF
1M
59k
0.1µF
63.4k
1µF
VOUT = 48V
IN
SW1-2
EN/UVLO
LT8331
VIN
36V TO
72V
220 H
1M
220 H
150mA AT VIN = 36V
165mA AT VIN = 48V
190mA AT VIN = 72V
SYNC/MODE
GND
FBX
BIAS
SS
VOUT
450kHz
4.7µF
×4
1µF
×2
V
RT
INTVCC
EFFICIENCY
POWER LOSS
VIN = 36V
VIN = 48V
VIN = 72V
LOAD CURRENT (mA)
0
50
100
150
200
0
10
20
30
40
50
60
70
80
90
100
0
0.5
1.0
1.5
2.0
8331 TA01b
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