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Freescale Semiconductor Electronic Components Datasheet

MC33874 Datasheet

Quad High-Side Switch

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MC33874 pdf
Freescale Semiconductor
Advance Information
Document Number: MC33874
Rev. 8.0, 4/2007
Quad High-Side Switch
(Quad 35 m)
33874
The 33874 is one in a family of devices designed for low-voltage
automotive and industrial lighting and motor control applications. Its
four low RDS(ON) MOSFETs (four 35 m) can control the high sides
of four separate resistive or inductive loads.
Programming, control, and diagnostics are accomplished using a
16-bit SPI interface. Additionally, each output has its own parallel
input for pulse-width modulation (PWM) control if desired. The 33874
allows the user to program via the SPI the fault current trip levels and
duration of acceptable lamp inrush or motor stall intervals. Such
programmability allows tight control of fault currents and can protect
wiring harnesses and circuit boards as well as loads.
HIGH-SIDE SWITCH
The 33874 is packaged in a power-enhanced 12x 12 nonleaded
Power QFN package with exposed tabs.
Features
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• Quad 35 mHigh-Side Switches (at 25°C)
• Operating Voltage Range of 6.0 V to 27 V with Standby Current
< 5.0 µA
• SPI Control of Overcurrent Limit, Overcurrent Fault Blanking
Time, Output OFF Open Load Detection, Output ON/OFF
Control, Watchdog Timeout, Slew Rates, and Fault Status
Reporting
• SPI Status Reporting of Overcurrent, Open and Shorted Loads,
Overtemperature, Undervoltage and Overvoltage Shutdown,
Fail-Safe Pin Status, and Program Status
• Analog Current Feedback with Selectable Ratio
• Analog Board Temperature Feedback
• Enhanced -16 V Reverse Polarity VPWR Protection
• Pb-Free Packaging Designated by Suffix Code PNA
PNA SUFFIX (PB_FREE)
98ARL10596D
24-PIN PQFN (12 x 12)
ORDERING INFORMATION
Device
MC33874BPNA/R2
Temperature
Range (TA)
-40°C to 125°C
Package
24 PQFN
VDD
VDD VPWR
VDD
VPWR
33874
VDD VPWR
SO
SCLK
CS
SI
I/O
MCU
I/O
I/O
I/O
I/O
I/O
A/D
GND A/D
WAKE
SI
SCLK
CS
SO
RST
FS
IN0
IN1
IN2
IN3
CSNS
TEMP
FSI
GND
HS0
HS1
HS2
HS3
LOAD 0
LOAD 1
LOAD 2
LOAD 3
Figure 1. 33874 Simplified Application Diagram
* This document contains certain information on a new product.
Specifications and information herein are subject to change without notice.
© Freescale Semiconductor, Inc., 2006. All rights reserved.



Freescale Semiconductor Electronic Components Datasheet

MC33874 Datasheet

Quad High-Side Switch

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MC33874 pdf
INTERNAL BLOCK DIAGRAM
CS
SCLK
SO
SI
RST
WAKE
FS
IN0
IN1
IN2
IN3
FSI
TEMP
INTERNAL BLOCK DIAGRAM
VDD
IUP
Internal
Regulator
VIC
VPWR
Over /Undervoltage
Protection
IDWN
SPI
3.0 MHz
VIC
Logic
RDWN
IDWN
Programmable
Watchdog
279 ms–2250 ms
VIC
Selectable Slew
Rate Gate Drive
Selectable Overcurrent
High Detection
HS[0:3]: 55 A or 40 A
Selectable Over-
current Low Detection
Blanking Time
0.15 ms–155 ms
Open Load
Detection
Overtemperature
Detection
Selectable Over-
current Low Detection
HS[0:3]: 2.8 A–10 A
HS0
HS1
HS2
HS0
HS1
HS2
Temperature
Feedback
HS3
Selectable Output Current
Recopy (Analog MUX)
HS[0:3]: 1/7200 or 1/21400
HS3
GND
Figure 2. 33874 Simplified Internal Block Diagram
CSNS
33874
2
Analog Integrated Circuit Device Data
Freescale Semiconductor



Freescale Semiconductor Electronic Components Datasheet

MC33874 Datasheet

Quad High-Side Switch

No Preview Available !

MC33874 pdf
Transparent Top View of Package
PIN CONNECTIONS
13 12 11 10 9 8 7 6 5 4 3 2 1
SO
GND
16
17
HS3 18
14
GND
24 FSI
23 GND
22 HS2
15
VPWR
PIN CONNECTIONS
19 20 21
HS1 NC HS0
Figure 3. 33874 Pin Connections
Table 1. 33874 Pin Definitions
A functional description of each pin can be found in the Functional Pin Description section beginning on page 15.
Pin
Number
Pin Name
Pin
Function
Formal Name
Definition
1
CSNS
Output
Output Current
The Current Sense pin sources a current proportional to the designated
Monitoring
HS0:HS3 output.
2
IN0 Input
Serial Inputs
The IN0:IN3 high-side input pins are used to directly control HS0:HS3 high-
3 IN1
side output pins, respectively.
5 IN2
6 IN3
4
TEMP
Output
Temperature
This pin reports an analog value proportional to the temperature of the GND
Feedback
flag (pins 14, 17, 23). It is used by the MCU to monitor board temperature.
7
FS Output
Fault Status
This pin is an open drain configured output requiring an external pullup resistor
(Active Low)
to VDD for fault reporting.
8
WAKE
Input
Wake
This input pin controls the device mode and watchdog timeout feature if
enabled.
9
RST
Input
Reset
This input pin is used to initialize the device configuration and fault registers,
as well as place the device in a low-current sleep mode.
10
CS Input
Chip Select
This input pin is connected to a chip select output of a master microcontroller
(Active Low)
(MCU).
11
SCLK
Input
Serial Clock
This input pin is connected to the MCU providing the required bit shift clock for
SPI communication.
12
SI Input
Serial Input
This pin is a command data input pin connected to the SPI Serial Data Output
of the MCU or to the SO pin of the previous device of a daisy-chain of devices.
13
VDD
Power Digital Drain Voltage This pin is an external voltage input pin used to supply power to the SPI circuit.
(Power)
Analog Integrated Circuit Device Data
Freescale Semiconductor
33874
3




Part Number MC33874
Description Quad High-Side Switch
Maker Freescale Semiconductor
Total Page 30 Pages
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