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Linear Technology Electronic Components Datasheet

LT8303 Datasheet

Micropower Isolated Flyback Converter

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Features
n 5.5V to 100V Input Voltage Range
n 450mA, 150V Internal DMOS Power Switch
n Up to 5W of Output Power
n Low Quiescent Current:
70µA in Sleep Mode
280µA in Active Mode
n Boundary Mode Operation at Heavy Load
n Low-Ripple Burst Mode® Operation at Light Load
n Minimum Load <0.5% (Typ) of Full Output
n VOUT Set with a Single External Resistor
n No Transformer Third Winding or Opto-Isolator
Required for Regulation
n Accurate EN/UVLO Threshold and Hysteresis
n Internal Compensation and Soft-Start
n 5-Lead TSOT-23 Package
Applications
n Isolated Telecom, Datacom, Automotive, Industrial,
and Medical Power Supplies
n Isolated Auxiliary/Housekeeping Power Supplies
LT8303
100VIN Micropower Isolated
Flyback Converter with
150V/450mA Switch
Description
The LT®8303 is a micropower high voltage isolated flyback
converter. By sampling the isolated output voltage directly
from the primary-side flyback waveform, the part requires
no third winding or opto-isolator for regulation. The output
voltage is programmed with a single external resistor.
Internal compensation and soft-start further reduce external
component count. Boundary mode operation provides a
small magnetic solution with excellent load regulation.
Low ripple Burst Mode operation maintains high efficiency
at light load while minimizing the output voltage ripple.
A 450mA, 150V DMOS power switch is integrated along
with all high voltage circuitry and control logic into a 5-lead
ThinSOT™ package.
The LT8303 operates from an input voltages range of
5.5V to 100V and can deliver up to 5W of isolated output
power. The high level of integration and the use of boundary
and low ripple burst modes result in a simple to use, low
component count, and high efficiency application solution
for isolated power delivery.
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners. Protected by U.S. Patents, including 5438499, 7463497,
and 7471522.
Typical Application
VIN
6V TO 80V
6V to 80VIN, 5VOUT Isolated Flyback Converter
4.7µF
VIN
LT8303
EN/UVLO
SW
GND
RFB
8303 TA01a
T1
6:1
150µH
4.2µH
VOUT+
5V
100µF
VOUT–
316k
2.5mA TO 0.33A (VIN = 12V)
2.5mA TO 0.52A (VIN = 24V)
2.5mA TO 0.73A (VIN = 48V)
2.5mA TO 0.84A (VIN = 72V)
For more information www.linear.com/LT8303
Efficiency vs Load Current
100
90
80
70
60
VIN = 12V
50 VIN = 24V
VIN = 48V
40 VIN = 72V
0 100 200 300 400 500 600 700 800 900
LOAD CURRENT (mA)
8303 TA01b
8303f
1


Linear Technology Electronic Components Datasheet

LT8303 Datasheet

Micropower Isolated Flyback Converter

No Preview Available !

LT8303
Absolute Maximum Ratings
(Note 1)
SW (Note 2)............................................................ 150V
VIN.......................................................................... 100V
EN/UVLO.................................................................... VIN
RFB....................................................... VIN – 0.5V to VIN
Current into RFB.................................................... 200µA
Operating Junction Temperature Range (Notes 3, 4)
LT8303E, LT8303I.............................. –40°C to 125°C
Storage Temperature Range............... –65°C to 150°C
Pin Configuration
TOP VIEW
EN/UVLO 1
GND 2
RFB 3
5 VIN
4 SW
S5 PACKAGE
5-LEAD PLASTIC TSOT-23
θJA = 215°C/W
Order Information http://www.linear.com/product/LT8303#orderinfo
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT8303ES5#PBF
LT8303ES5#TRPBF
LTGXH
5-Lead Plastic TSOT-23
–40°C to 125°C
LT8303IS5#PBF
LT8303IS5#TRPBF
LTGXH
5-Lead Plastic TSOT-23
–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.
8303f
2 For more information www.linear.com/LT8303


Part Number LT8303
Description Micropower Isolated Flyback Converter
Maker Linear
Total Page 24 Pages
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