Global Sources
EE Times-Asia
Stay in touch with EE Times Asia
EE Times-Asia > Power/Alternative Energy
Power/Alternative Energy??

Chip streamlines power supply designs

Posted: 24 Apr 2008 ?? ?Print Version ?Bookmark and Share

Keywords:power supply IC? power management? low-dropout linear regulator?

Freescale MC34700

Freescale Semiconductor has added the MC34700 power supply IC to its portfolio of power management products optimized for space-constrained high-voltage and high-power applications.

Freescale's MC34700 IC is a 9-18V quad-output integrated MOSFET device designed to reduce the complexity and streamline the development of power supplies.

The MC34700 is available in a 32-lead 5mm x 5mm QFN package, enabling the ability to generate up to four power rails in a small-footprint design. This capability reduces board space requirements over discrete designs. The wide input voltage range makes the device ideal for applications with a nominal 12V supply. The MC34700 features ample operating margin in systems where the 12V supply is only 20 percent accurate.

Four output channels are available in the MC34700 device. Channel 1 is a non-synchronous switching regulator; channels 2 and 3 are synchronous switching regulators; and channel 4 is a low-dropout linear regulator. All switching channels feature voltage-mode control with external compensation, allowing power supplies designed using the MC34700 to be tailored to a wide variety of output regulation and transient performance requirements.

The MC34700 is intended for applications with tight board space requirements and multiple power domains. Target applications include set-top boxes, cable modems, laser printers, fax machines, point-of-sale terminals, small appliances, telecom line cards and DVD players.

The MC34700 device's four output channels feature programmable output voltages over a wide range. The output of channel 1 can be programmed from 2V to 5.25V, and the outputs of channels 2 through 4 can be programmed from 0.7V to 3.6V. This programming flexibility enables generation of power rails for a multitude of downstream components, such as microprocessors, MCUs, memory ICs, low-voltage motors and small LCD panels.

The MC34700 features overvoltage, undervoltage, overcurrent and overtemperature protection designed to ensure robust and reliable operation. The device's fixed switching frequency, internal soft-start and internal power MOSFETs enable rapid power supply design and development by eliminating the need to consider such variables as optimal switching frequency, soft-start time and power MOSFET on-resistance.

MC34700 device samples are available now. Suggested resale pricing for the MC34700 in 10,000-piece quantities is $1.39. Suggested resale pricing for the KIT34700EPEVBE evaluation board, planned to be available in Q3 08, is $50.

Article Comments - Chip streamlines power supply design...
*? You can enter [0] more charecters.
*Verify code:


Visit Asia Webinars to learn about the latest in technology and get practical design tips.

Back to Top