MOTOROLA 33981 Data Manual
Summary
The 33981 is a versatile, self-protected high-side switch IC designed for modern power management applications. Featuring an extremely low 4.0 mΩ $R_{DS(ON)}$ and PWM control up to 60 kHz, it effectively replaces traditional electromechanical relays and fuses. This technical guide provides comprehensive details on its architecture, including terminal definitions, self-recovery features, and protection mechanisms (such as overcurrent monitoring and undervoltage shutdown). It is essential reading for electrical engineers and power designers working with high inrush current loads, motors, or various resistive/inductive systems requiring robust switching performance.
Page 1 Text Content
re sc le ic to r,
Freescale Semiconductor, Inc.
MOTOROLA Document order number: MC33981
Rev 2.0, 10/2004
SEMICONDUCTOR TECHNICAL DATA
Preliminary Information
High-Frequency, High-Current, Self-Protected High-Side Switch (4.0 mΩ up to 60 k Hz)
HIGH-SIDE SWITCH The 33981 is a high-frequency, self-protected 4.0 mΩ RDS(ON) high-side 4.0 mΩ
switch used to replace electromechanical relays, fuses, and discrete devices in power management applications. The 33981 can be controlled by pulse-width modulation (PWM) with a frequency up to 60 k Hz. It is designed for harsh environments, and it includes self-recovery features. The 33981 is suitable for loads with high inrush current, as well as motors and all types of resistive and inductive loads. The 33981 is packaged in a 12 nonleaded power-enhanced Power QFN package with exposed tabs. Features
Bottom View
Single 4.0 mΩ RDS(ON) Maximum High-Side Switch
PNA SUFFIX
PWM Capability up to 60 k Hz with Duty Cycle from 5% to 100%
SCALE 1:1 CASE 1402-02
Very Low Standby Current
16-TERMINAL PQFN (12 X 12)
Slew Rate Control with External Capacitor Overcurrent and Overtemperature Protection, Undervoltage Shutdown
ORDERING INFORMATION
and Fault Reporting
Temperature
Reverse Battery Protection
Device Package
Range (TA)
Gate Drive Signal for External Low-Side N-Channel MOSFET with Protection Features
PC33981PNA/R2 -40°C to 125°C 16 PQFN
Output Current Monitoring Temperature Feedback
Simplified Application Diagram
33981 Simplified Application Diagram
VPWRVDDVDD
SR VPWR
CBOOT
I/O FS
I/O INLS
I/O EN MCU I/O INHS
A/D TEMP
A/D CSNS GLS
GNDOCLS
This document contains information on a product under development. Motorola reserves the right to change or discontinue this product without notice.
For More Information On This Product,
© Motorola, Inc. 2004
Go to: www.freescale.com
Page Summary Contents For MOTOROLA 33981 Data Manual
Manual Details
| Brand | Motorola |
|---|---|
| Pages | 24 |
| File Size | 381.77 KB |
| Published | May 30, 2026 |
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Frequently Asked Questions
What is the maximum PWM frequency supported by the 33981 switch?
It can be controlled by Pulse-Width Modulation (PWM) up to a frequency of 60 kHz.
What types of loads are suitable for the 33981 High-Side Switch?
It is suitable for motors, high inrush current applications, and all types of resistive and inductive loads.
What protective features does the device offer?
Key protections include Overcurrent, Overtemperature Protection, Undervoltage Shutdown (UVDS), and self-recovery features.
Does it provide an output signal for monitoring high-side current?
Yes, the CSNS terminal outputs a current proportional to the OUT current which can be monitored externally by a microcontroller (MCU).