Freescale Semiconductor, Inc.
MOTOROLA
Document order number: MC33998/D
Rev 1.0, 03/2003
SEMICONDUCTOR TECHNICAL DATA
Advance Information
33998
Switching Power Supply with Linear
Regulators
The 33998 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
2.6 V linear regulator uses an external pass transistor to reduce the 33998
power dissipation. The 33998 also provides a 2.6 V linear standby regulator
and two 5.0 V sensor supply outputs protected by internal low-resistance
LDMOS transistors.
POWER SUPPLY
INTEGRATED CIRCUIT
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 33998 provides proper power supply sequencing for advanced
microprocessor architectures such as the Motorola MPC5xx and 683xx
microprocessor families.
DW SUFFIX
24-LEAD SOICW
CASE 751E
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 External Pass Transistor VDDL = 2.6 V @ 400 mA
• Low-Power Standby Linear Regulator VKAM = 2.6 V @ 10 mA
ORDERING INFORMATION
Temperature
Device
MC33998DW/R2
Package
• Two 5.0 V @ 200 mA (typical) Sensor Supplies VREF Protected Against
Range (T )
A
Short-to-Battery and Short-to-Ground with Retry Capability
-40°C to 125°C
24 SOICW
• 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
33998 Simplified Application Diagram
33998
VDDH
KA_V
V
5.0 V
PWR SW
PWR
V
V
V
V
DDH
MCU
5.0 V
5.0 V
REF1
REF2
DRVL
FBL
VDDL
VKAM
2.6 V
2.6 V
V
KAM
EN
SNSEN
GND
PWROK
VKAMOK
This document contains certain information on a new product.
Specifications and information herein are subject to change without notice.
For More Information On This Product,
© Motorola, Inc. 2003
Go to: www.freescale.com