General Instructions

The FDS6982S is designed to replace mosfets and Schottky diodes in two single SO-8 synchronous dc:dc to provide a variety of peripheral voltage power supplies for notebook computers and other battery powered electronics. The FDS6982S contains two unique 30V , N-channel, logic level, power transistor MOSFETs designed to maximize power conversion efficiency. Design of high-side switch (Q1)

Emphasis is placed on reducing switching losses while optimizing the low-side switch (q2) to reduce conduction losses. The Q2 also includes an integrated Schottky diode using Fairchild's monolithic synchronous FET technology.

feature

2: Optimized to minimize conduction losses Includes Syncfet Schottky body diode 8.6A, 30V rds(on)=0.016Ω@VGS=10Vrds(on)=0.022Ω@VGS=4.5VQ1: Optimized for low switching losses Low gate Charge (typ. 8.5 NC) 6.3A, 30V rds(on)=0.028Ω@VGS=10Vrds(on)=0.035Ω@VGS=4.5V

Schottky Body Diode

Features

Fairchild's Syncfet process embeds a Schottky diode in parallel with a power tube trench mosfet. This diode shows similar characteristics to the discrete outer Schottky diode in parallel with the mosfet. The figure shows the reverse recovery characteristics of the FDS6982S. FDS6982S Synchronous FET Body Diode Reverse Recovery Characteristics.

For ease of comparison, the figure shows the recovery characteristics of the opposite semiconductor laser body diode to an equivalent size mosfet (FDS6982) without a syncfet.

Schottky barrier diodes at high temperature and high reverse voltage. This increases the power in the device. Asynchronous FET (FDS6982) main body characteristic reverse recovery diode.

Synchronous Body Diode Leakage and Drainage Source Voltage

Temperature asynchronous FET (FDS6982) main body characteristic reverse recovery diode.

Disclaimer

Fairchild reserves the right to make changes to improve reliability, functionality or design, please note any product herein. Fairchild disclaims any liability arising out of the application or use of any product or circuit described herein; nor does it assign any license rights under its patents, nor the rights of others. Fairchild's products are not authorized for use as critical components in life support devices or systems not expressly approved in writing by Fairchild Semiconductor Corporation.

As used in this article:

1. A life support device or system means a device or system that (a) is intended for surgical implantation in the body, or (b) supports or sustains life, or (c) is not properly used as prescribed and has instructions for use on the label that can reasonably be Expected to cause the user 2. A critical component is any component of life that cannot perform a support device or system that can reasonably be believed to cause the failure of the life support device or system, or affect its safety or effectiveness.

notes:

1. rθja is the sum of the thermal resistances connected to the case and case-to-ambient, where the case thermal reference is defined as the drain pin. rθjc is guaranteed by design and rθca is determined by user board design.

2. Pulse test: pulse width <300 microseconds, duty cycle <2.0%

3. “Syncfet Schottky Body Diode Characteristics.”