Analog Integrated Circuit Device Data

28

Freescale Semiconductor

33988

TYPICAL APPLICATIONS

TYPICAL APPLICATIONS

The 33988 can be configured in several applications. The figure below shows the 33988 in a typical main switch application.

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.

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

device must be used to maintain the device in its Safe

Operating Area.

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).

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).

A/D

MCU

I/O

I/O

SI

SO

SCLK

I/O

CS

SI

FS

VDD

FSI

CSNS

RST

CS

IN0

SCLK

WAKE

33988

100nF

10µF

GND

HS1

HS0

VPWR

2.5µF

10nF

LOAD

RFS

1k

2.2k

10k

10

7

8

12

4

2

9

5

13

1

16

6

15

14

3

LOAD

Voltage

Regulator

IN1

I/O

SO

11

10k

10k

10k

10k

10k

10k