LT3837 - Isolated No-Opto Synchronous Flyback Controller
Datasheet Documentation
Datasheet
Design Note
Reliability Data
Press Release
cad_symbol
Overview

Features

Typical Application

LT3837 Typical Application
LT3837 Typical Application
LT3837 Typical Application

Description

The LT3837 is an isolated switching regulator controller designed for medium power flyback topologies. A typical application is 10W to 60W with the part powered from a DC supply.

The LT3837 is a current mode controller that regulates an output voltage based on sensing the secondary voltage via a transformer winding during flyback. This allows for tight output regulation without the use of an optoisolator, improving dynamic response and reliability. Synchronous rectification increases converter efficiency and improves output cross regulation in multiple output converters.

The LT3837 operates in forced continuous conduction mode which improves cross regulation in multiple winding applications. Switching frequency is user programmable and can be externally synchronized. The part also has load compensation, undervoltage lockout and soft-start circuitry.

The LT3837 is available in a thermally enhanced 16-pin TSSOP package.

Packaging

TSSOP-16

LT3837 Package Drawing
Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price
(1-99)		 Price
(1k)*
LT3837EFE#PBF TSSOP 16 E $4.43 $3.10
LT3837EFE#TRPBF TSSOP 16 E $3.16
LT3837IFE#PBF TSSOP 16 I $4.69 $3.28
LT3837IFE#TRPBF TSSOP 16 I $3.34
LT3837EFE TSSOP 16 E $8.86 $6.20
LT3837EFE#TR TSSOP 16 E $6.32
* 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
DC1038A-A LT3837EFE | 9V -36V input to 3.3V at 10A Sync. Flyback Converter $225.00
DC1038A-B LT3837EFE | 9V -36V input to 5V at 7A Sync. Flyback Converter $200.00
DC1038A-C LT3837EFE | 9V -36V input to 12V at 3A Sync. Flyback Converter $175.00
DC950A-B LT3837EFE Demo Board | 9V ≤ Vin ≤ 36V, Vout: 5V/2A, 3.3V/3A, 2.5V/3A $150.00