MC33285/D - Freescale Semiconductor / Motorola

 Motorola,Inc 1999 Rev 2.4

MOTOROLA

SEMICONDUCTOR

TECHNICAL DATA

This document contains information on a new product under development. Motorola reserves the

right to change or discontinue this product without notice.

PIN CONNECTIONS

MC33285

Product Preview HIGH SIDE

TMOS DRIVER

Block Diagram And Typical Application

SRC

OUT1

DRN

OUT2

8IN

GND

VCC

GND

IOUTN2

OUT2

OUT1

SRC

VCC

Band-

Rthr

DRN

IOUTN1

VOUT2-VDRN> VTH2

VOUT1

-VSRC > VTH1

ION2 ION1

gap

Charge

pump

Oscillator

and

Divider

tLDdet

tOUT2ect

Load Dump

Detection

tOCdet

start tOCdet

OCPC

OUT2 Activation

Time

THRIN1

THRIN2

VREF

CCP

VIGN

Kl.30

OC Detection

Automotive Dual High

Side TMOS Driver

ORDERING INFORMATION

Device Temperature

Range Package

SO8-40

C to +125

CMC33285D

SILICON MONOLITHIC

INTEGRATED CIRCUIT

The MC33285 is a dual high side TMOS driver designed for use in

the harsh automotive switching applications.

The purpose of the MC33285 is to drive two power n-channel FETs in

a high side application with an inductive load. The application in an

automotive environment requires the capability of withstanding high

voltages and load dump transients. The MC33285 is able to withstand

reverse battery conditions at selected pins.

It protects the n-channel power FET on OUT1 under over current

condition. This device has one input to control both stages on or off.

• Temperature Range from -40°C to +125°C

• PWM Capability

• Power TMOS # 1 Over-Current and Short-Circuit Protection

• Voltage Range 7V to 40V

• Extended Temperature Range from -40°C to 125°C

• Load Dump Protected

• Over Voltage Detection and Activation of OUT2 during Overvoltage

• Single Input Control for both Output Stages

• Capacitor Value of 100nF Connected to Pin CP

• Analog Input Control Measurement Detection

• OUT1 LOAD leakage measurement detection

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MC33285 MOTOROLA 2

MC33285

MAXIMUM RATING

THERMAL RATINGS

ELECTRICAL CHARACTERISTICS. (TA from -40°C to +125°C, Vcc from 7V to 20V, unless otherwise noted)

SRC PIN 1

DRN PIN 3

OUT1 PIN2, OUT 2 PIN 4

VCC PIN 6

IN PIN 8

Rating Symbol Value Unit

Maximum voltage at pins OUT1 OUT2 VOUT VVCC + 20 V

Maximum voltage at pin CP VCP 50 V

Input voltage Vi at DRN VDRN -2 ; 40 V

Input voltage Vi at SRC VSRC -5 ; 40 V

Input voltage at pin VCC VCC -2 to 40 V

Input Voltage at pin IN. Condition : -2V<VVCC<40V VIN -2 to VVCC V

Operational voltage VVCC at pin VCC VVCC 7 to ViV

Rating Symbol Value Unit

Storage Temperature Tstg -40 to +150 °C

Operating ambient temperature Ta-40 to +125 °C

Characteristic Symbol Min Typ Max Unit

OVERVOLTAGE AND OVERCURRENT

Load Dump Detection Time tLDdet 250 400 550 µs

Load Dump Activation Time tOUT2act 300 460 620 ms

Error Voltage Threshold VDRN - VSRC 1.12 1.44 V

Overcurrent Detection Time tOCdet 520 800 1080 µs

Leakage Current ILCdet 15 30 50 mA

Leakage Current Detection Time tLCdet 130 200 270 µs

Operating Current (7V<VDRN<20V) IDRN 1.5 mA

Leakage current (0V<VDRN<20V, V VCC<4V) Ileak_DRN -5 5µA

Output On Voltage. Charge Pump ON Von Vcc+15 V

Turn off current, Vout >0.5V Ioutoff 66 110 154 µA

Turn On Time, OUT1: 8nF,10µΑ ; OUT2:

16nF,10µΑ

- 7V < Vcc < 10V, Vout > Vcc+7

- 10V < Vcc < 20V, Vout > Vcc+11

ton 1.5

1.5

Supply Voltage Range Vcc 740 V

Quiescent Supply Current at Vcc = 20V Icc 10 mA

Input Low Voltage OUT1 Vil 0.7 V

Input High Voltage OUT1 Vih 1.7 V

Input Hysteresis OUT1, OUT2 Vhys 0.4 V

Input Pull Down Current, 0.7V<Vin<6V Iin 7.5 15 16.5 µA

Open Input Voltage Viop 0.7 V

Input Low Voltage OUT2 Vil2 3V

Input High Voltage OUT2 Vih2 3.9 V

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MC33285 MOTOROLA 3

MC33285

Turn On Characteristics

The power FETs are turned on by charging their gate capacities with a current flowing out of pin OUT1 and OUT2.

During PWM, the values of table below are guaranteed. They are measured with 8nF on OUT1 and 16nF on OUT2.

- test condition : VIN : ramp 0V to 2.5V or 2.5V to 5V.

Figure1. Turn-on Behaviour

Table 1 Turn on behaviour

The output voltages at OUT1 and OUT2 are limited by controlling the current sources Ion1, Ion2 to avoid currrent flowing

through the external or the internal zener diode .

If Vcc + Vth (threshold voltage) is reached , the current sources are turned off.

- threshold VTH1 for OUT1 output voltage control : 7V < VTH1 < Vz

- threshold VTH2 for OUT2 output voltage control : 7V < VTH2 < 15V

Turn off characteristics

The power FETs on OUT1 and OUT2 are turned off by discharging the gate capacity with the constant discharge current

IOUToff .

- discharge current IOUTxoff : IOUTxoff = 110µA

condition : VOUTx > 0.5V ( VIN < VTHRxIN )

Test conditions for switching off the power FETs :

- 1. IN open

- 2. Stages disabled via pin IN

- 3. Stage OUT1 disabled by an over current error

Voltage VVCC Minimum VOUT1,OUT2

after ton1 = 100µsec Minimum VOUT1,OUT2

after ton2 = 1.0msec Minimum VOUT1,OUT2

after ton3 = 1.5msec

7V < VVCC < 10V

10V < VVCC < 20V

20V < VVCC < 40V

VVCC - 0.7V

VVCC + 5.95V

VVCC + 9.35V VVCC + 7V

VVCC + 11V

20ms

VOUT2

2.5V

VCCP

THRIN1

THRIN2

VOUT1

VOUT2

2.5V

VOUT1

VOUT1max

ton1

ton2 ton3

2.5V

VOUT2

VOUT2max

ton1 ton2 ton3

VVCC+7V

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MC33285 MOTOROLA 4

MC33285

FUNCTIONNAL DESCRIPTION

Introduction

The MC33285 contains only one charge pump for two

outputs.The outputs OUT1 and OUT2 are switched on and off

by the input IN .There are three ways to control the outputs:

OUt1 can be switched alone , they can be switched together

or OUT2 can be switched when OUT1 is already on .In the last

case , the voltage drop on OUT1 when charging OUT2 is

limited .

The external capacitor CCP connected to pin CP is used to

store the charge continuously delivered by the charge pump .

The voltage on this pin is limited to a maximum value VCPmax .

Both outputs are sourced with a constant current from CCP to

switch them on . In addition , the gates of the power FETs are

precharged from VCC to prevent CCP from being discharged

by a voltage on OUT1 or OUT2 which is still lower than

VVCC.The values of the output voltages are limited to

VOUT1max and VOUT2max

The power FET on OUT1 is protected againts an

exceeded gate-source voltage by an internal zener diode.

Channel 1 allows to protect the n-channel power FET on

OUT1 under over current condition. The drain-source voltage

of the FET on OUT1 will be checked, if the channel 1 is

switched on. The internal error voltage threshold determines

the maximum drain-source voltage that allows the power FET

to stay in the on state. If the measured drain-source voltage

exceeds the internal error voltage threshold, the output of the

Over Current Protection Comparator (OCPC) is enabled. If

the output of the OCPC is active longer than tOCdet , the output

OUT1 is switched off .

After switching off the power FET on OUT1 by an over

current condition, the power FET can only be turned on again

by the input IN.

When switching off the power FETs their gate capacities

are discharged by a constant currennt IOUToff

IF the input IN is disconnected, the MC33285 outputs

OUT1 and OUT2 are in the off state.

If overvoltage occurs on pin DRN for a time period longer

than tLDdet , then OUT2 is switched on for the time tOUT2act. In

overvoltage condition OUT1 is off if IN is below Vih.

Internal Zener Diode

An on-chip zener diode is placed between OUT1 and

SRC. Design guarantees that VZ > VTH1

- zener clamping voltage between OUT1 and SRC :

VTH1 < VZ < 20V

PWM capability

The CPIC2 is PWM capable on OUT2. The loss of charge

on Ccp when switching on OUT2 is refreshed until the start on

the next PWM cycle to a value which is sufficient to guarantee

the specified turn on behaviour.

The PWM capability is measured with a test circuit and

load conditions

- PWM cycle : period T = 20ms ; OUT2 is switched on from

10% to 90% of T .

- Test condition : VIN : ramps 2.5V to 5V according to PWM

cycle defined above.

Crosstalk between OUT1 and OUT2

If output OUT2 is switched on while OUT1 is already on,

the voltage drop that occurs on OUT1 is limited.

Voltage drop on OUT1 :

10V < VVCC < 20V : OUT1 not below VVCC + 7V

7V < VVCC < 20V : OUT1 not below VVCC + 7V

Each time OUT1 is switched on, a current ILCdet is

sourced out of pin SRC for the time tLCdet to check if there is

an external leakage current on that node in the application.

The high side switch on OUT1 is turned on only if the test is

successful."

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MC33285 MOTOROLA 5

MC33285

Motorola reserves the right to make changes without further notice to any products herein to improve

reliability, function or design. Motorola does not assume any liability arising out of the application or use of any

product or circuit described herein ; neither does it convert any licence under its patent rights of others. Motorola

products are not authorized for use as components in life support devices or systems intended for surgical implant

into the body or intended to support or sustain life. Buyer agrees to notify Motorola of any such intended end use

whereupon Motorola shall determine availability and suitability of its products for the use intended. Motorola and

are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Employment opportunity/Affirmative

Action Employer.

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