33988 Datasheet, PDF (28/34 Pages) Freescale Semiconductor, Inc – Dual Intelligent High-current Self-protected Silicon High Side Switch (8.0mΩ)

TYPICAL APPLICATIONS
TYPICAL APPLICATIONS
The 33988 can be configured in several applications. The figure below shows the 33988 in a typical main switch application.
V_PWR
V_DD
Voltage
Regulator
V_DD
V_DD NC V_PWR
V_DD
V_PWR
MCU
2.2k 10k
100nF
I/O
I/O
SCLK
CS
I/O
SI
SO
I/O
A/D
10k
10k
10k
10k
10k
10k
1k
10 _VDD
10µF
VPWR ¹⁴
2.5µF
10nF
2 _WAKE
4 _IN0
12 _IN1
8 _{SCLK 33988}
7 _CS
3 _RST
11 _SO
9 _SI
5 _FS
1 _CSNS
6 _FSI
RFS
HS1 ¹⁵
HS0 ¹⁶
GND ¹³
LOAD
LOAD
Figure 12. Typical Applications
The loads must be chosen in order to guarantee the device
normal operating condition as junction temperature from -40
to 150°C. In case of permanent short-circuit conditions, the
duration and number of activation cycles must be limited with
a dedicated MCU fault management using the fault reporting
through SPI.
Two application notes are available in order to:
• propose safe configurations of the eXtreme Switch
devices in case of application faults and protect all circuitry
with minimum external components (AN 3274),
• provide guidelines for Printed Circuit Board (PCB) design
and assembly (AN 2469).
Figure 13 describes the maximum turn-off current versus
load inductance for single-pulse method, based on lab
characterization results. When driving DC motor or Solenoid
loads demanding multiple switching, an external recirculation
Development effort will be required by the end users to
optimize the board design and PCB layout in order to reach
electromagnetic compatibility standards (emission and
immunity).
device must be used to maintain the device in its Safe
Operating Area.
33988
28
Analog Integrated Circuit Device Data
Freescale Semiconductor