30V Power MOSFETs for DC/DC Converters
Broad lineup offers industry-leading switching performance

2012-07-04

ROHM has recently announced the development of power MOSFETs for low-voltage DC/DC converters used in servers, notebook PCs, and tablet PCs. This new series features high efficiency and is available in 16 different models and 3 space-saving package types for broad compatibility.

The increasing performance of servers and notebook PCs has led to a rise in power consumption and a drop in operating voltages across the CPU and other circuitry, increasing temperature while shortening life. In order to alleviate this, power MOSFETs are being mounted in a wide variety of power supply circuits, such as synchronous rectification DC/DC converters that play a key role in power conversion efficiency. However, for a power MOSFET to achieve low loss and high efficiency it is necessary to reduce both ON resistance and gate capacitance – impossible to achieve before now.

ROHM's latest power MOSFETs feature simultaneously low gate capacitance and low ON resistance through a proprietary low-capacitance structure along with a new 'trench-type field plate structure' and advanced miniaturization technology. As a result, FOM (Figure of Merit, a performance indicator of power MOSFETs for DC/DC converters) is reduced 50% compared with conventional products, achieving industry-leading switching performance. This minimizes both switching loss at the high side of a synchronous rectification DC/DC power supply circuit and conduction loss on the low side, increasing the efficiency of the entire system. It also allows for synchronous rectification at high frequency, making it possible to use smaller peripheral components. In addition, ROHM conducts 100% testing of Rg (gate resistance) and UIS (low-load avalanche capacity) to ensure optimum performance and reliability in synchronous rectification circuits.

Pricing: 30-50yen/piece (samples)
Availability: Now (OEM quantities)

<Key Features>

1) Low ON resistance, Low capacitance
Miniaturization technology, coupled with a proprietary low-capacitance structure and new trench-type field plate structure, result in a low capacitance, low ON-resistance element with an FOM value 50% less than conventional ROHM products.

Low ON resistance, Low capacitance

2) Industry-leading efficiency
Adopting this new series of power MOSFETs in synchronous rectification DC/DC power supply circuits will result in significantly reduced power loss for minimal power consumption. In addition, superior performance at high operating frequencies makes it possible to use smaller peripheral components, contributing to end-product miniaturization.

Industry-leading efficiency

3) Compact, space-saving package; Dual-element types also available
The broad lineup includes three compact package types for wide compatibility, including an HSMT8 package featuring a mounting area 65% smaller than the HSOP8 package for considerable space savings. In addition, a new dual-element HSOP8 package is available that combines both high-side and low-side MOSFETs for DC/DC power supply circuits that not only reduces mounting area, but mounting time and labor as well.

Compact, space-saving package; Dual-element types also available Compact, space-saving package; Dual-element types also available

<Specifications>  

Specifications
 

<Terminology>

  1. DC/DC converter
    A power supply circuit that converts one DC voltage level to another. For example, from a 12V reference voltage to various smaller voltages (e.g. 0.9V-5V) used to operate microprocessors or memory within a device such as server or personal computer.
  2. FOM (Figure of Merit)
    An indicator that represents the performance of a power MOSFET. FOM is calculated from Ron×Qgd. Generally, the lower, the better.
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