DC/DC Controllers provide output voltages down to 0.8 V.

Press Release Summary:

Models MIC2198/9, offering current capability of 20 A, can power CPUs, DSPs, and FPGAs with up to 95% efficiency. Input voltage range is 4.5-32 V, making them suitable for 5, 12, and 24 V power bus systems. Model MIC2198 operates at 500 kHz, while Model MIC2199 operates at 300 kHz. Both units are housed in 4 x 4 mm MLFTM 12-lead package, and provide PWM current mode control, cycle-by-cycle current limiting, and frequency foldback short circuit protection.

Original Press Release:

Micrel Releases Family of Small, Simple, Efficient, DC/DC Controllers

...MIC2198 operates at 500KHz and provides output voltages down to 0.8V at 20A
...4mm x 4mm 12-lead package saves 46% area compared to SO-8 package
...current-mode PWM control simplifies stability compensation

SAN JOSE, Calif. - (July 14) - Micrel has released a family of five new simple to use, high-efficiency DC/DC controllers housed in small, low pin-count packages. The MIC2198, MIC2199, MIC2193, MIC2194 and MIC2196 were designed and developed by Micrel Semiconductor (NASDAQ: MCRL), an industry leader in analog, power management and high-speed communications integrated circuits.

The MIC2198/9 are ideal for powering the latest generation chipsets in today's point-of-load DC/DC architectures. Their low output voltage capability of down to 0.8V, along with high current capability of 20A, powers the latest CPUs, DSPs and FPGAs with up to 95% efficiency. Housed in the 4mm x 4mm MLFTM 12-lead package, which is 46% smaller than the commonly used SO-8 package, the ICs save valuable board area. The 500KHz operating frequency of MIC2198 further saves board space by allowing the use of small external inductor and capacitors. The MIC2198 and MIC2199 operate over a wide 4.5V to 32V input voltage range, making them suitable for 5V, 12V, and 24V power bus systems. The MIC2199 operates at a slower 300KHz, allowing higher efficiency in high input voltage systems by reducing switching losses.

"The MIC2198 and MIC2199 are versatile, easy to use DC/DC controllers that save designers significant board area. Space is saved by a combination of the small 4mm x 4mm package, and the low pin-count that allows for a minimum amount of external components. Additionally, the current-mode PWM control of MIC2198/9 is easier to compensate than common voltage-mode converters, ensuring stability over a wide range of applications," says Tony Grizelj, Micrel's marketing manager for power products.

Complementing the MIC2198/9 family, Micrel has also recently released a family of simple buck and boost controllers housed in the SO-8 package. The low pin-count of the SO-8 package allows designers to simplify their designs and use minimal external components. The MIC2193 is a high efficiency synchronous buck controller that can achieve duty-cycles up to 100%. The MIC2194 is a flexible buck controller optimized for buck "step-down" applications and can also be configured in a buck-boost circuit that generates negative voltages. The MIC2196 is a boost "step-up" controller that can generate high output voltages and currents. All three MIC2193/4/6 devices operate from 2.9V to 14V input voltages, allowing them to step up or step down 3.3V, 5V, and 12V power rails that are common in telecom/datacom/server applications. The 400KHz operation of the MIC2193/4/6 family allows small external capacitors and inductors to be used, saving valuable board space.

The MIC2198 and MIC2199 are available in the 4mm x 4mm MLFTM 12-lead package and are priced at $1.99 in 1,000-piece quantities. The MIC2193BM, MIC2194BM, and MIC2196BM are available in the SO-8 package and are priced at $1.97 in 1,000-piece quantities Samples are available from stock, and production quantities are stock to 12 weeks ARO.

Summary of Features & Applications:

MIC2198/9 4mm x 4mm Synchronous Buck PWM Controllers
o 4.5V to 32V input voltage range
o Output voltage down to 0.8V
o Up to 20A output current
o >90% efficiency
o PWM current mode control
o 500Khz operation (MIC2198)
o 300KHz operation (MIC2199)
o Cycle-by-cycle current limiting
o Frequency foldback short circuit protection
o Micropower shutdown
o Adjustable under-voltage lockout
o 4mm x 4mm MLFTM 12-lead package

o Point of load power distribution in 5V, 12V, 24V, and 28V systems
o FPGA, CPU and DSP power supplies
o Wireless modems
o Cable modems
o DSL line cards
o Servers
o Telecom equipment
o Tape drives

Micrel Semiconductor is a leading manufacturer of advanced, high performance communications, clock management, Ethernet switch and physical layer transceiver, mixed signal, analog and power ICs. These products include devices for fiber-optic telecommunications and networking, cellular telephones, servers, portable computer systems, computer peripherals, process control systems, consumer electronics and power supplies.

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