Isolated Gate Drivers feature programmable dead time.

Press Release Summary:

Occupying 200 mm², Si823x ISOdriver Series integrates 2-channel isolator and dual driver into single chip. High-side, low-side, 4 A units feature propagation delay of 50 ns, optimizing timing margins and control response. Because devices are designed in CMOS, they do not suffer from performance drift over time and temperature. Integrated under-voltage lock-out circuitry prevents erroneous FET driver switching when input voltages are low during system start up/shut down.

Original Press Release:

Silicon Laboratories Introduces Industry's Highest Integration Isolated Gate Driver

--ISOdriver Devices Integrate Isolator and 4 Amp Driver into a Single Chip--

AUSTIN, Texas, May 05, 2008 - Silicon Laboratories Inc. (Nasdaq: SLAB), a leader in high-performance, analog-intensive, mixed-signal ICs, today announced the Si823x ISOdriver family, the industry's fastest and most integrated isolated gate drivers. Ideal for power supplies, motor control and lighting systems, the ISOdriver family integrates a two-channel isolator and dual driver into a single chip while improving power efficiency, enabling customers to increase power supply density and performance.
Based on Silicon Laboratories' proprietary RF isolator technology and advanced CMOS gate driver design, the ISOdriver family offers higher reliability, increased noise immunity and 50 percent PCB area reduction compared to competing approaches.

Traditionally, power system designers rely on expensive, complex multi-die optocouplers that use exotic process technologies and require a discrete bill-of-materials - including an external FET driver. By integrating the isolator and driver into a single chip, the ISOdriver external BOM is reduced to only three capacitors and a diode, allowing an isolated high-side/low-side or dual low-side driver solution that occupies only 200 mm2.

The Si823x ISOdriver family also offers a number of performance improvements over optocoupler-based solutions. As the only isolated, high-side, low-side, 4 Amp driver available, the ISOdriver family delivers significant improvements in MOSFET turn-on and turn-off times. Less power is wasted during a FET switching cycle, enabling higher efficiency supplies. Integrated overlap protection also improves efficiency by preventing high-side and low-side MOSFETs from being on at the same time. Compared to typical opto-isolator based solutions with propagation delays of hundreds of nanoseconds or longer, the ISOdriver's shorter propagation delay of 50 ns (max) increases timing margins and improves control response for better overall system performance and reliability. Because the ISOdriver devices are designed in CMOS, they do not suffer from the performance drift over time and temperature of optocoupler-based solutions. The ISOdriver family's unique CMOS-based design has the added benefit of providing tighter tolerances on unit-to-unit variations, eliminating the need for factory screening or calibration after system assembly.

In addition to performance, integration and reliability advantages, the Si823x family features programmable dead-time, allowing users to optimize efficiency. Integrated under-voltage lock-out (UVLO) circuitry on both the input and output sides of the isolated driver prevents erroneous FET driver switching when input voltages are low during system start up or shut down, thus preventing damage to the supply.

"Power designers face a number of challenges when designing sophisticated, high-efficiency power delivery systems," said Dave Bresemann, vice president of Silicon Laboratories. "By offering higher functional integration coupled with significant performance enhancements over traditional solutions we're solving a key customer problem."

Pricing and Availability

Available now, the Si823x family is priced from $1.25 to $1.70 in quantities of 1K based on configuration and peak output current. The Si823x devices are available in three input configurations and offer 0.5 and 4 Amp peak output currents. Two control interfaces are also available: two wire and PWM.

Part           Configuration       Overlap          Programmable      Inputs    Pk IOUT
Number Protection Dead Time (A)
Si8230 High-side/low-side Yes Yes VIA, VIB 0.5
Si8231 High-side/low-side Yes Yes PWM 0.5
Si8232 Dual low-side - - VIA, VIB 0.5
Si8233 High-side/low-side Yes Yes VIA, VIB 4.0
Si8234 High-side/low-side Yes Yes PWM 4.0
Si8235 Dual low-side - - VIA, VIB 4.0

Silicon Laboratories Inc.

Silicon Laboratories is an industry leader in the innovation of high-performance, analog-intensive, mixed-signal ICs. Developed by a world-class engineering team with unsurpassed expertise in mixed-signal design, Silicon Labs' diverse portfolio of highly-integrated, easy-to-use products offers customers significant advantages in performance, size and power consumption. These patented solutions serve a broad set of markets and applications including consumer, communications, computing, industrial and automotive.

Headquartered in Austin, TX, Silicon Labs is a global enterprise with operations, sales and design activities worldwide. The company is committed to contributing to our customers' success by recruiting the highest quality talent to create industry-changing innovations. For more information about Silicon Labs, please visit

Silicon Laboratories Inc., Austin

Lindsey Starnes, +1 512-532-5349

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