MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

This document contains certain information on a new product.

Specifications and information herein are subject to change without notice.

© Motorola, Inc. 2003

33997 Simplified Application Diagram

Document order number: MC33997/D

Rev 3.0, 03/2003

33997

Advance Information

Switching Power Supply with Linear

Regulators

The 33997 is a medium-power, multi-output power supply integrated circuit

that is capable of operating over a wide input voltage range, from 6.0 V up to

26.5 V with 40 V transient capability. It incorporates a sensorless current

mode control step-down switching controller regulating directly to 5.0 V. The

3.3 V linear regulator uses an external pass transistor to reduce the 33997

power dissipation. The 33997 also provides a 3.3 V linear standby regulator

and two 5.0 V sensor supply outputs protected by internal low-resistance

LDMOS transistors.

There are two separate enable pins for the main and sensor supply outputs

and standard supervisory functions such as resets with power-up reset delay.

The 33997 provides proper power supply sequencing for advanced

microprocessor architectures such as the Motorola MPC5xx and 683xx

microprocessor families.

Features

• Operating Voltage Range 6.0 V up to 26.5 V (40 V transient)

Short-to-Battery and Short-to-Ground with Retry Capability

• Reset Signals

• Power-Up Delay

• Enable Pins for Main Supplies (EN) and Sensor Supplies (SNSEN)

• Power Sequencing for Advanced Microprocessor Architectures

• SOIC-24WB Package

ORDERING INFORMATION

Device

Temperature

Package

MC33997DW/R2

-40°C to 125°C

24 SOICW

DW SUFFIX

24-LEAD SOICW

CASE 751E

POWER SUPPLY

INTEGRATED CIRCUIT

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com