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