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MOTOROLA
SEMICONDUCTOR
TECHNICAL DATA
MC33285
HIGH SIDE TMOS DRIVER
SILICON MONOLITHIC INTEGRATED CIRCUIT
Prototype Information
Automotive Dual High Side TMOS Driver
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 -40C to +125C PWM Capability Power TMOS # 1 Over-Current and Short-Circuit Protection Voltage Range 7V to 40V Reverse Battery Conditions at Selected Pins Extended Temperature Range from -40C to 125C 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
PIN CONNECTIONS
SRC 1 OUT1 2 DRN 3 OUT2 4
8 7 6 5
IN GND VCC CP
Block Diagram And Typical Application
VIGN Kl.30 CP
VCC
CCP
+ VREF Load Dump Detection IN
THRIN2
S
R tLDdet
Oscillator and Divider
Charge pump
Bandgap Rthr
DRN
ION2
ION1
tOUT2ect RQ + + OUT2 Activation Time S IOUTN2
OUT2
VOUT2-VDRN> VTH2
OUT1
VOUT1-VSRC> VTH1
THRIN1
GND OC Detection
IOUTN1 RQ S tOCdet start tOCdet OCPC
M + SRC
This document contains information on a new product under development. Motorola reserves the O Motorola,Inc right to change or discontinue this product without notice.
Date : 10/12/98 Rev : 2.1
MC33285
MAXIMUM RATING ELECTRICAL RATINGS
Rating Maximum voltage at pins OUT1 OUT2 Maximum voltage at pin CP Input voltage Vi at DRN and SCR Input voltage at pin VCC Input Voltage at pin IN condition : -2VV
ELECTRICAL CHARACTERISTICS. (TA from -40C to +125C, Vcc from 7V to 20V, unless otherwise noted) SRC pin 1
Characteristic Leakage Current Symbol Ileak_src IDRN Ileak_DRN Von Voff Min -10 Typ Max 10 Unit mA
OUT 1 pin 2
Operating Current (7V20V) Leakage current (0VDRN pin 3
Output On Voltage. Charge Pump ON Output Off Voltage. Charge Pump OFF Turn off current - with NO Over Vds Condition, and Vout >0.5V - with Over Vds Condition, and Vout >0.5V Turn On Time - Cl = 25nF, 7V < Vcc < 10V, Vout > Vcc+7 - Cl = 25nF, 10V < Vcc < 20V, Vout > Vcc+10 Vcc+15 0.9 V V mA Ioutn Ioutw ton 1 1 70 5 110 10 150 15 ms
OUT2 pin 4
Supply Voltage Range Quiescent Supply Current - at Vcc = 7V - at Vcc = 20V Vcc Icc 1.8 2.8 5 5 7 20 V mA
CP pin 5
Output Voltage @ I = 1mA Vol 1.5 V
VCC pin 6
Input Low Voltage Input High Voltage Input Hysteresis Input Pull Down Resistor. Vin>11V Open Input Voltage Vil Vih Vhys Rin Viop 3.5 0.8 20 36 100 1 1.5 V V V kW V mA V
IN pin 8
Timer Current On Threshold Itime Vhth 7.8 5.2 10 5.5 12.2 5.8
MC33285
MOTOROLA
2
MC33285
Off Threshold Discharge Current @ Vtime = 5V Saturation Voltage @ Itime = 1mA Vlth Idisch Vsat 2.47 2 2.75 3.03 10 0.4 V mA V
Turn On Characteristics The power FETs are turned on by charging their gate capacities with a current owing out of pin OUT1 and OUT2. The values of table 10.2-1 are guaranteed. For these values it is not necessary to switch OUT1 and OUT2 at the same time. They are measured with the test circuit and load conditions specied in Chapter 10.1. - test condition : VIN : ramp 0V to 2.5V or 2.5V to 5V.
Figure 1. Turn-on Behaviour of the MC33285
5V IN 2.5V IN THRIN2 THRIN1
VCCP
DVOUT1
VOUT2
T
DVOUT2
2.5V IN 0V VOUT1max IN
5V
2.5V VOUT2 max
VOUT1
0V
0 ton1 ton2 ton3
VOUT2
0V
0 ton1 ton2 ton3
Figure D.Turn on behaviour Voltage VVCC 7V < VVCC < 10V 10V < VVCC < 20V 20V < VVCC < 40V Minimum VOUT1,OUT2 after ton1 = 100msec VVCC - 0.7V VVCC - 0.7V VVCC - 0.7V Minimum VOUT1,OUT2 after ton1 = 1.0msec VVCC + 5.95V VVCC + 9.35V Minimum VOUT1,OUT2 after ton1 = 1.5msec VVCC + 7V VVCC + 11V
The output voltages at OUT1 and OUT2 are limited by controlling the current sources Ion1, Ion2 to avoid currrent owing through the external or the internal zener diode . If the threshold voltage is reached , the current sources are turned off. - threshold VTH1 for OUT1 output voltage control : 14V < VTH1 < 16V condition : ( VOUT1 - VSRC ) < VTH1 - threshold VTH2 for OUT2 output voltage control : 13V < VTH2 < 15V condition : ( VOUT2 - VDRN ) < VTH2 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 = 110mA 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
MC33285
MOTOROLA
3
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 , which also provides protection against reverse battery conditions . 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. For more details see Figure 6-1. When switching off the power FETs their gate capacities are discharged by a constant currennt IOUToff IF the input IN is diconnected , the MC33285 outputs OUT1 and OUT2 is 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 THR1 Internal Zener Diode An on-chip zener diode is placed between OUT1 and SRC. Design guarantee 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 sufcient to guarantee the specied 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 dened 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. CCP is not allowed to be sourced by OUT1. - Voltage drop on OUT1 : 10V < VVCC < 20V : OUT1 not below VVCC + 9V 7V < VVCC < 20V : OUT1 not below VVCC + 5V
Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. Typical parameters which may be provided in Motorola data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including Typicals must be validated for each customer application by customer's technical experts. Motorola does not convey any license under its patent rights nor the rights of others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part. Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer.
MC33285
MOTOROLA
4

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