MC33997| Datasheet

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Freescale Semiconductor, Inc.
MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Document order number: MC33997/D Rev 3.0, 03/2003

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) Step-Down Switching Regulator Output VDDH = 5.0 V @ 1400 mA (total) Linear Regulator with E
xternal Pass Transistor VDDL = 3.3 V @ 400 mA Low-Power Standby Linear Regulator VKAM = 3.3 V @ 10 mA Two 5.0 V @ 200 mA (typical) Sensor Supplies VREF Protected Against Short-to-Battery and Short-to-Ground with Retry Capability Undervoltage Shutdown on the VDDL, VDDH Outputs 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

33997

POWER SUPPLY INTEGRATED CIRCUIT

Freescale Semiconductor, Inc...

DW SUFFIX 24-LEAD SOICW CASE 751E

ORDERING INFORMATION
Device MC33997DW/R2 Temperature Range (TA) -40 C to 125 C Package 24 SOICW

33997 Simplified Application Diagram

This document contains certain information on a new product. Specifications and information herein are subject to change without notice. Motorola, Inc. 2003

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