San Jose, Calif. - Micrel Semiconductor is offering five dc/dc controller chips in small, low-pin-count packages. The 500-kHz MIC2198 and 300-kHz MIC2199 synchronous buck PWM controllers, in 4 x 4-mm, 12-lead microlead frames, are aimed at powering chip sets in point-of-load dc/dc architectures. The 400-kHz MIC2193/4/6 controllers are housed in SO-8 packages.
The MIC2198 and 2199 are said to offer low-output capability, down to 0.8 volt, along with 20-amp current capability to power CPUs, DSPs and FPGAs with up to 95 percent efficiency. The 500-kHz operating frequency of the 2198 further saves board space by allowing the use of small external inductors and capacitors, according to Micrel. The 2199's 300-kHz operation allows higher efficiency in high-input-voltage systems by reducing switching losses. Both parts operate over a 4.5- to 32-V input range.
The MIC2193 high-efficiency synchronous buck controller achieves duty cycles up to 100 percent. The MIC2194 is a flexible buck controller that is optimized for step-down but that 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 parts operate from 2.9-V to 14-V inputs, letting them step up or down the 3.3-, 5- and 12-V power rails common in telecom, datacom and server apps.
The MIC2198 and MIC2199 are priced at $1.99 in 1,000-piece quantities. The MIC2193BM, MIC2194BM and MIC2196BM are priced at $1.97 in 1,000-piece quantities. Samples are available from stock. Production-volume delivery is stock to 12 weeks ARO.
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