Freescale Semiconductor
Technical Data
Document Number: MC33988
Rev. 7.0, 05/2012
Dual Intelligent High-current
Self-protected Silicon High Side
Switch (8.0 mOhm)
The 33988 is a dual self-protected 8.0 mΩ silicon switch used to
replace electromechanical relays, fuses and discrete devices in
power management applications. The 33988 is designed for harsh
environment and 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 33988 is packaged in a power-enhanced 12 x 12 mm
nonleaded PQFN package with exposed tabs.
Features
Dual 8.0 mΩ max high side switch with parallel input or SPI control
6.0 V 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
•
•
•
•
33988
HIGH SIDE SWITCH
BOTTOM VIEW
FK SUFFIX
98ARL10521D
16-PIN PQFN
ORDERING INFORMATION
Device
(For Tape and Reel,
add an R2 Suffix)
MC33988CHFK
Temperature
Range (T
A
)
- 40 °C to 125 °C
Package
16 PQFN
V
DD
V
DD
V
DD
V
PWR
33988
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. 33988 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., 2010-2012. All rights reserved.
FREESCALE [ FREESCALE SEMICONDUCTOR, INC ]
