Quad-output power supply IC

18 March 2009 Power Electronics / Power Management

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

The MC34700 is a 9,0 V to 18 V quad-output integrated MOSFET device designed to reduce the complexity and streamline the development of power supplies. It is available in a 32-lead 5 x 5 mm QFN package, enabling the ability to generate up to four power rails in a small-footprint design. The wide input voltage range makes the device suitable for applications with a nominal 12 V supply. The MC34700 features ample operating margin in systems where the 12 V supply is only 20% accurate.

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 to be tailored to a wide variety of output regulation and transient performance requirements.

The MC34700’s four output channels feature programmable output voltages over a wide range. The output of channel 1 can be programmed from 2,0 V to 5,25 V, and the outputs of channels 2 through 4 can be programmed from 0,7 V to 3,6 V. 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 over-voltage, under-voltage, over-current and over-temperature protection. 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.

Target applications include set-top boxes, cable modems, laser printers, fax machines, point-of-sale terminals, small appliances, telecom line cards and DVD players.

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