onsemi FDMC7208S Dual N-Channel PowerTrench MOSFET: Datasheet, Application Circuit, and Pinout Explanation

The onsemi FDMC7208S is a highly integrated dual N-Channel MOSFET utilizing advanced PowerTrench® technology, designed to deliver superior performance in a compact package. This device is engineered for high-efficiency power management applications, offering a low on-resistance (RDS(on)) and fast switching characteristics, which are critical for minimizing power losses and improving thermal performance.

Datasheet Overview

The datasheet for the FDMC7208S provides essential specifications, including a drain-source voltage (VDS) of 20V and a continuous drain current (ID) of 7.5A per MOSFET. Key parameters such as gate threshold voltage (VGS(th)), typically ranging from 0.6V to 1.2V, and total gate charge (Qg), are detailed to assist designers in optimizing drive circuitry. The device features an ultra-low RDS(on) of just 8.5mΩ (max) at VGS = 4.5V, ensuring minimal conduction losses. Thermal characteristics, like junction-to-ambient thermal resistance (RθJA), are also specified for effective heat management.

Application Circuit

The FDMC7208S is ideal for synchronous buck converters in DC-DC power supplies, particularly in computing and consumer electronics. A typical application circuit involves using one MOSFET as the control switch (high-side) and the other as the synchronous rectifier (low-side). This configuration leverages the dual MOSFET structure to reduce component count and board space. Designers must ensure proper gate driving, often using a dedicated MOSFET driver IC to provide sufficient voltage and current for fast switching, thereby reducing switching losses and preventing shoot-through.

Pinout Explanation

Housed in a space-saving SO-8FL package, the FDMC7208S pinout is designed for ease of use and optimal electrical performance:

- Pin 1 (Source 1): Source terminal of the first MOSFET.

- Pin 2 (Gate 1): Gate terminal of the first MOSFET.

- Pin 3 (Source 2): Source terminal of the second MOSFET.

- Pin 4 (Gate 2): Gate terminal of the second MOSFET.

- Pins 5, 6, 7, 8 (Drain 1 & Drain 2): These pins are internally connected to the drain terminals of both MOSFETs, providing excellent thermal and electrical conductivity. This common-drain configuration simplifies PCB layout and enhances heat dissipation.

ICGOODFIND: The onsemi FDMC7208S is an excellent choice for compact, high-efficiency power systems, combining advanced PowerTrench technology with a user-friendly package to meet the demands of modern electronic designs.

Keywords: PowerTrench MOSFET, Synchronous Buck Converter, Low RDS(on), SO-8FL Package, Dual N-Channel