Freescale Semiconductor
Technical Data
Document Number: MC33984
Rev. 12.0, 4/2010
Dual Intelligent High-current
Self-protected Silicon High Side
Switch (4.0 mΩ)
The 33984 is a dual self-protected 4.0 mΩ silicon switch used to
replace electromechanical relays, fuses, and discrete devices in
power management applications. The 33984 is designed for harsh
environments, and it includes self-recovery features. The device is
suitable for loads with high inrush current, as well as motors and all
types of resistive and inductive loads.
Programming, control, and diagnostics are implemented via the
Serial Peripheral Interface (SPI). A dedicated parallel input is available
for alternate and pulse-width modulation (PWM) control of each
output. SPI-programmable fault trip thresholds allow the device to be
adjusted for optimal performance in the application.
The 33984 is packaged in a power-enhanced 12 x 12 nonleaded
PQFN package with exposed tabs.
Features
Dual 4.0 mΩ max high side switch with parallel input or SPI control
6.0 to 27 V operating voltage with standby currents < 5.0
μA
Output current monitoring with two SPI-selectable current ratios
SPI control of over-current limit, over-current fault blanking time,
output-OFF open load detection, output ON/OFF control, watchdog
timeout, slew rates, and fault status reporting
• SPI status reporting of over-current, open and shorted loads, over-
temperature, under-voltage and over-voltage shutdown, fail-safe
pin status, and program status
• Enhanced -16 V reverse polarity V
PWR
protection
•
•
•
•
33984B/C
HIGH SIDE SWITCH
BOTTOM VIEW
PNA SUFFIX
98ARL10521D
16-PIN PQFN
ORDERING INFORMATION
Device
MC33984BPNA/R2
- 40°C to 125°C
MC33984CPNA/R2
16 PQFN
Temperature
Range (T
A
)
Package
V
DD
V
DD
V
DD
V
PWR
33984
VDD
I/O
I/O
SO
SCLK
FS
WAKE
SI
SCLK
CS
SO
RST
INO
IN1
CSNS
FSI
GND
LOAD
HS0
LOAD
HS1
VPWR
GND
MCU
CS
SI
I/O
I/O
I/O
A/D
Figure 1. 33984 Simplified Application Diagram
Freescale Semiconductor, Inc. reserves the right to change the detail specifications,
as may be required, to permit improvements in the design of its products.
© Freescale Semiconductor, Inc., 2007-2010. All rights reserved.
FREESCALE [ FREESCALE SEMICONDUCTOR, INC ]
