Datasheet Linear Technology LT8309IS5#TRPBF

Manufacturer	Linear Technology
Series	LT8309
Part Number	LT8309IS5#TRPBF

Secondary-Side Synchronous Rectifier Driver

Datasheets

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PDF, 232 Kb, Language: en, File uploaded: Jul 31, 2016, Pages: 14
Secondary-Side Synchronous Rectifier Driver

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Prices

Packaging

Package	SOT-23
Package Code	S5
Package Index	05-08-1635

Parametrics

Demo Boards	DC1961A
Design Tools	LTspice File
Export Control	no
Integrated Inductor	no
Monolithic	no
Number of Outputs	1
Operating Temperature Range	-40 to 85 °C
Polyphase	no
Synchronous	yes
Topology	Flyback Synchronous Rectifier
Vin Max	40 V
Vin Min	4.5 V

Eco Plan

RoHS

Compliant

Articles

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Increase Current Capability and Simplify Thermal Design of Flyback Converters with Secondary-Side Synchronous Rectifier Driver in a 5-Pin SOT-23 &mdash LT Journal
PDF, 376 Kb, File published: Jan 6, 2014
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Increase Current Capability and Simplify Thermal Design
of Flyback Converters with Secondary-Side Synchronous
Rectifier Driver in a 5-Pin SOT-23
Wei Gu In a flyback converter, current levels in high current applications are constrained
by heat produced in the output rectifier diode. The clear way to lift this restriction
is to replace the diode with a much lower voltage drop MOSFET, significantly
reducing heat produced in the rectifierвЂ”reduced heat dissipation increases output
current capability and efficiency, and simplifies thermal design. The LT8309 is a
secondary-side synchronous MOSFET driver that replicates the behavior of the
output diode by sensing the drain-to-source voltage of the MOSFET to determine
if should be on or off, allowing it to replace a less efficient rectifier diode.
The LT8309 can be combined with any
of LinearвЂ™s line of no-opto boundarymode flyback ICs (such as the LT3748
primary side controller) to produce high
performance isolated power supplies
with a minimal number of components.
5V, 8A ISOLATED SUPPLY Figure 1 shows a low voltage, high
current, low parts count flyback
supply. The traditional output diode is
replaced by an ideal diode consisting
of the LT8309, a MOSFET and a few
small external components.
For a MOSFET to act as a diode it must …

Model Line

Series: LT8309 (16)

LT8309ES5#PBF LT8309ES5#TR LT8309ES5#TRM LT8309ES5#TRMPBF LT8309ES5#TRPBF LT8309HS5#PBF LT8309HS5#TR LT8309HS5#TRM LT8309HS5#TRMPBF LT8309HS5#TRPBF LT8309IS5 LT8309IS5#PBF LT8309IS5#TR LT8309IS5#TRM LT8309IS5#TRMPBF LT8309IS5#TRPBF

Manufacturer's Classification

Power Management > Switching Regulator > Flyback, Forward and Isolated Controllers
Space & Harsh Environment > Extended Temperature Plastic (H & MP) > Extended Temperature (H & MP) Power Management
Power Management > Power Control > Secondary Side Controllers

Other Names:

LT8309IS5TRPBF, LT8309IS5 TRPBF