LT8303 - 100Vin Micropower Isolated Flyback Converter with 150V/450mA Switch
Datasheet Documentation
Reliability Data
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Typical Application

LT8303 Typical Application
LT8303 Typical Application


The LT8303 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.



LT8303 Package Drawing
Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price
LT8303HS5#TRPBF SOT 5 H $5.22 $3.65
LT8303ES5#PBF SOT 5 E $4.50
LT8303ES5#TRPBF SOT 5 E $4.50 $3.15
LT8303IS5#PBF SOT 5 I $4.79
LT8303ES5#TRMPBF SOT 5 E $4.50 $3.20
LT8303IS5#TRMPBF SOT 5 I $4.79 $3.40
LT8303IS5#TRPBF SOT 5 I $4.79 $3.35
LT8303HS5#PBF SOT 5 H $5.22
LT8303HS5#TRMPBF SOT 5 H $5.22 $3.70
* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC2490A LT8303ES5 Isolated Demo Board | No-Opto Flyback, 36V ≤ VIN ≤ 72V, VOUT = 5V @ up to 0.84A $125.00