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Freescale streamlines power supply designs with space-saving power IC

MC34700 device enables efficient control of four power rails; provides multiple output voltages for microprocessors, memory and motors

(PresseBox) (AUSTIN, Texas, ) As electronics manufacturers pack more and more features into smaller devices, space is at a premium in the power supply housing, as well as on the system board. To help developers design compact power supplies, Freescale Semiconductor has added the MC34700 power supply integrated circuit (IC) to its portfolio of power management products optimized for space-constrained high-voltage and high-power applications.

Freescale's MC34700 IC is a 9.0V to 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 5x5mm 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 2.0V 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, microcontrollers, 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 features
-Three switching regulators: two synchronous and one non-synchronous
-One low dropout linear regulator
-Output current capability:
-1.5A continuous on channel 1
-1.25A continuous on channels 2 and 3
-400mA continuous on channel 4
-Internal power MOSFETs on all channels
-Voltage feedforward on channel 1
-±1.5% output voltage accuracy on all channels
-Cycle-by-cycle current limit and short-circuit protection
-Fixed 800kHz switching frequency
-Internal soft-start
-Overvoltage and undervoltage protection
-Overtemperature protection
-Open-drain power-good output signal
-Separate active-high enable input for each channel

Pricing and availability

MC34700 device samples are available now. Suggested resale pricing for the MC34700 in 10,000-piece quantities is $1.39 (USD). Suggested resale pricing for the KIT34700EPEVBE evaluation board, planned to be available in Q3 2008, is $50 (USD).

For more information about the MC34700 IC, visit

Freescale Halbleiter Deutschland GmbH

Freescale Semiconductor is a global leader in the design and manufacture of embedded semiconductors for the automotive, consumer, industrial, networking and wireless markets. The privately held company is based in Austin, Texas, and has design, research and development, manufacturing or sales operations in more than 30 countries. Freescale is one of the world's largest semiconductor companies with 2007 sales of $5.7 billion (USD).