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1.5 A Switch-Mode Power Supply with Linear Regulator

The 34701 provides the means to efficiently supply the Freescale Power QUICC? I, II, and other families of Freescale microprocessors and DSPs. The 34701 incorporates a high performance switching regulator, providing the direct supply for the microprocessor’s core, and a low dropout (LDO) linear regulator control circuit provides the microprocessor I/O and bus voltage.

The switching regulator is a high-efficiency synchronous buck regulator with integrated N-channel power MOSFETs to provide protection features and to allow space-efficient, compact design.

The 34701 incorporates many advanced features; e.g., precisely maintained up/down power sequencing, ensuring the proper operation and protection of the CPU and power system.

Features

? Operating Voltage from 2.8 V to 6.0 V

? High-Accuracy Output Voltages

? Fast Transient Response

? Switcher Output Current Up to 1.5 A

? Undervoltage Lockout and Overcurrent Protection

? Enable Inputs and Programmable Watchdog Timer

? Voltage Margining via I2C? Bus

? Reset with Programmable Power-ON Delay

? Pb-Free Packaging Designated by Suffix Code EK