33198 FREESCALE | Alldatasheet
Document overview
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Technical content
Features
- Designed for Automotive High Side Driver Application
- Works with a Wide Variety of N-Channel Power MOSFETs
- PWM Capability
- On Board Charge Pump Capable of Charging 25nF in less than 1ms with No External Components Required
- Drive Inductive Load with No Ex ternal Clamp Circuitry Required
- CMOS Logic Compatible Input Control
- TMOS Over Current and Short Circuit Protection
- Fault Output to Report an MOSFET Overcurrent Condition
- Output Status Available when MOSFET is On or Off
- Extended Temperature Range from -40°C to 125°C
- Protected Against Automotive Transients with few External Components
- Overvoltage and Undervoltage Shutdown
- Pb-Free Packaging Designated by Suffix Code EF
Figure 1. 33198 Simplified Application Diagram
ORDERING INFORMATION
Range (TA) Package MC33198D -40°C to 125°C 8 SOICN MCZ33198EF/R2 33198 MCU VBAT 5.0V STATUS INPUT GND TIMER SRC GATE DRN VCC LOAD
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Figure 2. 33198 Simplified Internal Block Diagram and Typical Application
Figure 3. 33198 Pin Connections Table 1. 33198 Pin Definitions
1 SRC Source Input to detect MOSFET/load status
2 DRN Drain Input to set overvoltage threshold
3 GND Ground Ground for the device
4 GATE Gate Output to control the gate of external MOSFET
5 VCC VCC Power for the device
6 STATUS Status Output signal for MOSFET status
7 INPUT Input Control input
8 TIMER Timer Inrush Current detection delay timer input
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ELECTRICAL CHARACTERISTICS
Table 2. Maximum Ratings permanent damage to the device.
- ESD testing is performed in accordance with the Human Body Model (HBM) (C ZAP = 100 pF, RZAP = 1500 Ω), the Machine Model (MM)
(CZAP = 200 pF, RZAP = 0 Ω), and the Charge Device Model (CDM), Robotic (CZAP = 4.0pF).
- Pin soldering temperature limit is for 10 seconds maximum dura tion. Not designed for immersion soldering. Exceeding these limits may
cause malfunction or permanent damage to the device.
- Freescale’s Package Reflow capability meets Pb-free requirements for JEDEC standard J-STD-020C. For Peak Package Reflow
MC33xxxD enter 33xxx), and review parametrics.
Analog Integrated Circuit Device Data Freescale Semiconductor 5 33198 STATIC ELECTRICAL CHARACTERISTICS STATIC ELECTRICAL CHARACTERISTICS Table 3. Static Electrical Characteristics values noted reflect the approximate parameter means at TA = 25°C under nominal conditions unless otherwise noted.
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STATIC ELECTRICAL CHARACTERISTICS TIMER PIN 8 Timer Current ITIME 7.0 10 14 µA On Threshold VHTH 5.2 5.5 5.8 V Discharge Current @ VPIN8 = 5.0V IDISCH 2.0 5.0 10 mA Saturation Voltage @ IPIN8 = 1mA VSAT - 0.15 0.4 V Table 3. Static Electrical Characteristics (continued) values noted reflect the approximate parameter means at TA = 25°C under nominal conditions unless otherwise noted.
Analog Integrated Circuit Device Data Freescale Semiconductor 7 33198 DYNAMIC ELECTRICAL CHARACTERISTICS DYNAMIC ELECTRICAL CHARACTERISTICS TIMING DIAGRAMS Figure 4. Timing Measurements Test Schematic Table 4. Dynamic Electrical Characteristics values noted reflect the approximate parameter means at TA = 25°C under nominal conditions unless otherwise noted.
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Figure 5. Descriptive Waveform Diagram
Analog Integrated Circuit Device Data Freescale Semiconductor 9 33198 ELECTRICAL PERFORMANCE CURVES ELECTRICAL PERFORMANCE CURVES Figure 6. Supply Current versus Supply Voltage. Figure 7. Supply Current versus Supply Voltage. Figure 8. Time Current versus Supply Voltage Figure 9. Drain Current versus Supply Voltage Figure 10. Fault Output Voltage versus Current Figure 11. Gate Voltage versus Voltage
80 Ta = 25°C
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ELECTRICAL PERFORMANCE CURVES Figure 12. Gate Voltage versus Gate Output Current. Figure 13. Gate Voltage versus Gate Output Current. Figure 14. Gate Voltage versus Gate Output Current. Figure 15. Gate Voltage versus VCC and RG at
Analog Integrated Circuit Device Data Freescale Semiconductor 11 33198 FUNCTIONAL DESCRIPTION INTRODUCTION FUNCTIONAL DESCRIPTION INTRODUCTION The MC33198 is a high side TMOS driver, dedicated to automotive applications. It is used in conjunction with an external power MOSFET for high side drive applications. The device can drive and protect a large variety of MOSFETs. The device has a CMOS compatible input control, charge pump to drive the MOSFET gate, and fault detection circuitry based on programmable V DS monitoring to detect shorted loads. It also includes a programmable timer function to eliminate undesired switch off due to in rush currents, and a status pin which reports the output status of both on and off MOSFET states. The device uses few external components, and offers an economical solution to large current high side switches. It also has PWM capability up to 1kHz. POWER SUPPLY The MC33198 can be supplied from the battery line. It is designed with a 60V technology, making it able to sustain up to 60V transient pulses. In the off state, with pin 7 low, the supply current can be up to 5.0mA, and in operation, pin 7 high, the current up to 25mA. The device has an undervoltage detection and shutdown near 7.0V. Below this value the MOSFET is turned off. There is also a 25V overvoltage detection which switches off the output pin 4 to protect both the MOSFET and the load when V CC is higher than 25V. CHARGE PUMP The device incorporates a self running charge pump with an internal capacitor and is connected at Gate pin 4. To prevent oscillation, a serial resistor can be added. The charge pump is able to charge a 25nF capacitor in less than 1ms. This allows the MC33198 to have a rapid response time and to drive the external TMOS gate very quickly, allowing fast switching on of the load. The device has an internal 15V zener diode between pin 4 and 1, to clamp the Gate-to- Source voltage and protect the MOSFET gate oxide from destruction. See Dynamic Electrical Characteristics on page 7 for details. BAND GAP AND REFERENCE CURRENTS The MC33198 has an internal band gap reference voltage which generates all the internal thresholds. This band gap is also used to generate internal reference currents necessary for proper operation of the device. These currents are : Pin 2 : Drain current (typically 80mA). Pin 4 : High and low gate discharge currents (typically 100mA and 10mA). Pin 8 : Timer charge current (10mA typical). All these currents are derived from the same reference voltage and internal resistor. Their accuracy and variability is approximately +-25% over the full temperature and voltage range. In addition, a passive pull down current of 5.0mA maintains the gate of the MOSFET below 0.9V when the device has no supply, ensuring that the MOSFET remains off. This passive pulldown current is operating even if device VCC (pin 5) is not powered up. INPUT CIRCUITRY The Input pin (pin 7) of the device is CMOS compatible and can be directly connected to a microcontroller. The input current is determined by an internal pull down resistor, typically 36kW. A hysteresis of 0.8 V minimum is present at this input. OUTPUT STATUS The device has a status output (pin 6) which has an open collector structure. This pin is used to report the MOSFET overload condition or the LOAD status when the MOSFET is off. The device Pin 1 (Source) is compared to a programmable threshold at Pin 2, in both the on and off state of the MOSFET. This allows the detection of the MOSFET over VDS or over load conditions when the MOSFET is on and the load short to VBAT monitoring, when the MOSFET is in the off state. This status pin is normally connected to a pull- up resistor and a micro input, and can drive up to 1.0mA. TIMER The Timer pin (pin 8) is used in conjunction with an external capacitor to create a delay between the overload detection and the shutdown of the MOSFET. In case of over load, the internal current source pin 8 will charge the capacitor. When the voltage at pin 8 reaches the 5.5V threshold, the internal C3 comparator will be triggered and switch off the output to protect the MOSFET. The fault and the MOSFET turn off condition are latched and are reset by switching the input off and on. The delay between the overload detection and actual MOSFET turn off is used to allow a temporary overload which will prevent the system from switching off during possible inrush currents or transients. MOSFET PROTECTION AND OUTPUT VOLTAGE MONITORING The MC33198 has the ability to sense the output MOSFET source voltage and compare it to a predetermined threshold. This threshold is programmable, using the internal reference current of 80mA and an external resistor connected at pin 2 (DRN). The device can monitor the output load voltage, as well as protect the MOSFET in case of overload. The overload detection threshold must be adapted to the MOSFET itself depending on the load to be driven and the thermal capability of the MOSFET. In practice, the maximum acceptable V DS of the MOSFET should be determined and based upon the MOSFET maximum power dissipation.
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and the C2 comparator threshold. the input pin 7 to 0 and back to 1. When the MOSFET is off, we have the same scheme. summarized in Table 5, Status Functionality.
- The resistor will limit the current flowing into pin 1 and
reasonable discharge current. Internal Block Diagram on page 2. MOSFET gate will be discharged only by a 10mA current. switched off from the main battery line. See Figure 18. Table 5. Status Functionality
Figure 16. Schematic with RGATE Resistor Figure 17. RGATE Signal Comparison switching time due to this resistor. Figure 18. 33198 Reverse Battery Table 6. Switching Off Characteristics with MOSFET
- Time from negative edge of input signal (Pin 7) to negative
edge of gate voltage (Pin 4) measured at 5V threshold.
- Gate discharge time, not LOAD switching OFF time.L
- TMOS used is Freescale MTP50N06, load 10 Ω resistor.
7 INPUT
6 STATUS
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Figure 19. 33198 GND Disconnection Circuitry
Analog Integrated Circuit Device Data Freescale Semiconductor 15 33198 PACKAGING PACKAGE DIMENSIONS PACKAGING PACKAGE DIMENSIONS For the most current package revision, visit www.freescale.com and perform a keyword search using the “98A” listed below. D SUFFIX EF SUFFIX (PB-FREE) 8-PIN PLASTIC PACKAGE 98ASB42564B ISSUE U
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REVISION HISTORY
REVISION DATE DESCRIPTION OF CHANGES 2.0 11/2006 • Converted to Freescale format.
- Implemented Revision History page.
- Removed Comparison of the 33198 TO the 33091
- Added part number MCZ33198EF (Pb-Free) to Ordering Information on page 1
- Added Peak Package Reflow Temperature During Reflow (2), (3) on page 4
Rev. 2.0 Information in this document is provided solely to enable system and software implementers to use Freescale Semiconductor products. There are no express or implied copyright licenses granted hereunder to design or fabricate any integrated circuits or integrated circuits based on the information in this document. Freescale Semiconductor reserves the right to make changes without further notice to any products herein. Freescale Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Freescale Semiconductor 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 that may be provided in Freescale Semiconductor 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. Freescale Semiconductor does not convey any license under its patent rights nor the rights of others. Freescale Semiconductor 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 Freescale Semiconductor product could create a situation where personal injury or death may occur. Should Buyer purchase or use Freescale Semiconductor products for any such unintended or unauthorized application, Buyer shall indemnify and hold Freescale Semiconductor 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 Freescale Semiconductor was negligent regarding the design or manufacture of the part. Freescale™ and the Freescale logo are trademarks of Freescale Semiconductor, Inc. All other product or service names are the property of their respective owners. © Freescale Semiconductor, Inc., 2007. All rights reserved. RoHS-compliant and/or Pb-free versions of Freescale products have the functionality and electrical characteristics of their non-RoHS-compliant and/or non-Pb-free counterparts. For further information, see http://www.freescale.com or contact your Freescale sales representative. For information on Freescale’s Environmental Products program, go to http:// www.freescale.com/epp. How to Reach Us: Home Page: www.freescale.com Web Support: http://www.freescale.com/support USA/Europe or Locations Not Listed: Freescale Semiconductor, Inc. Technical Information Center, EL516
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