TPD2004F TOSHIBA Intelligent Power Device Silicon Monolithic Power MOS IC TPD2004F 2-channel Squib Driver for Air Bags Manufactured through the Bi-CMOS-DMOS process, this 2-channel squib drive IPD is designed for use in SRS electronic system air bags. Features z Using independent four-channel inputs, this IC controls two high-side and two low-side switches, making it possible to drive two squibs directly. z Incorporates various diagnostic functions (analog multiplexer outputs): • Squib short-to-battery diagnosis • Squib short-to-ground diagnosis • Squib open-circuit diagnosis • Safing sensor-ON fault diagnosis • High-redundancy, upstream arrangement for safing sensor Weight: 0.29g (typ.) • Squib short diagnosis • Squib drive MOSFET diagnosis z Chip select function allows for multi-channel structure to be materialized using minimum control lines. z Comes in a 24-pin SSOP surface mount package. z Supports embossed taping. Pin Assignment (top view) Marking Lot No. TPD2004F A dot indicates lead (Pb)-free package or lead (Pb)-free finish. Part No. (or abbreviation code) Note: Due to its MOS structure, this product is sensitive to static electricity. 1 2006-10-31 TPD2004F Block Diagram 2 2006-10-31 TPD2004F Pin Description Pin No. Symbol Pin Description 1 SQ1+ Squib positive (+) side output pin for channel 1 2 HSD1 High-side driver control input pin for Channel 1 (pull-down) 3 SS1 Safing sensor connect pin for channel 1 4 VBB Backup block power supply input pin 5 SHTD 6 ENB 7 AO 8 LSD1 Low-side driver control input pin for Channel 1 (pull-up) 9 SELT Control input pin for switching between diagnosis line and analog multiplexer (pull-down) 10 SQ1- Squid negative (-) side output pin for channel 1 (shared with reference resistor pin for short diagnosis) 11 SQ1REF Shorting diagnosis reference resistor pin for channel 1 12, 13 GND 14 SQ2REF 15 SQ2- Squib negative (-) side output pin for channel 2 (shared with reference resistor pin shorting diagnosis) 16 SQS Squib switchover control input pin during each squib diagnosis 17 LSD2 Low-side driver control input pin for Channel 2 (pull-up) 18, 19 VCC 5V block power supply input pin (two pins) 20 CS Chip select control input pin (pull-up) 21 CCADJ 22 SS2 23 HSD2 High-side driver control input pin for Channel 2 (pull-down) 24 SQ2+ Squib positive (+) side output pin for Channel 2 Control input pin for short diagnosis (pull-down) INHIBIT input pin to inhibit ignition when this input is pulled low (pull-down) Analog multiplexer output pin Ground pin (Two pins) Shorting diagnosis reference resistor pin for Channel 2 (pull-down) Current setup resistor connect pin for short diagnosis constant-current source connect pin) (reference resistor Safing sensor connect pin for Channel 2 3 2006-10-31 TPD2004F Truth Table State SQUIB HSD1 HSD2 LSD1 LSD2 SELT SHTD SQS ENB CS MULTIP DIVIDING LEXER VOLTAGE ch SW SQ1 H * L * * * * H * ― ― SQ2 * H * L * * * H * ― ― SQ1 L L H H L H L H L 1 ― SQ1 L L H H H H L H L 2 ― SQ2 L L H H L H H H L 3 ― SQ2 L L H H H H H H L 4 ― SS1 Potential Diagnosis (Not Divided) SQ1 L L H H H L L L L 5 ― SS2 Potential Diagnosis (Not Divided) SQ2 L L H H H L H L L 7 ― SS1 Potential Diagnosis (Divided) SQ1 L L H H H L L H L 5 SW1 SS2 Potential Diagnosis (Divided) SQ2 L L H H H L H H L 7 SW3 SQ-1 Potential Diagnosis (Not Divided) SQ1 L L H H L L L H L 6 ― SQ-2 Potential Diagnosis (Not Divided) SQ2 L L H H L L H H L 8 ― SQ-1 Potential Diagnosis (Divided) SQ1 L L H H L L L L L 6 SW2 SQ-2 Potential Diagnosis (Divided) SQ2 L L H H L L H L L 8 SW4 High-side Driver Diagnosis SQ1 H L H H L L L H L 6 SW2 SQ2 L H H H L L H H L 8 SW4 Low-side Driver Diagnosis SQ1 L L L H L L L H L 6 ― SQ2 L L H L L L H H L 8 ― Ignition Short Diagnosis *: Note: Note: Note: Don’t Care When ENB input is pulled low, ignition is inhibited. When CS is high, the diagnostic inputs SELT, SHTD, and SQS are ignored (in logic) and the AO pin is placed in the high-impedance state. If ignited under shorted condition, the device may break down. 4 2006-10-31 TPD2004F Functional Description (1) 2-channel squib drive function Using independent four-channel inputs, this IC controls two high-side and two low-side switches, making it possible to drive two squibs directly. (2) Squib line short-to-battery, short-to-ground and open-circuit diagnostic function (diagnostic voltage output) When the squib is in normal state, by an external diagnostic resistor, the device outputs a voltage derived from VCC by dividing it according to the resistance ratio. Because this voltage is output via the analog multiplexer, it is possible to diagnose short-to-battery, short-to-ground and open-circuit in the squib line using a microcomputer. Also, the device contains a shunt circuit to prevent the analog multiplexer from breaking down when the squib is short-to-battery. (3) Squib short diagnostic function (diagnostic voltage output) A diagnostic current is flowed from the internal constant-current source to the squib and reference resistor, and the voltage drop in each is amplified by an internal amp whose gain is the same for both. These voltages are output via the analog multiplexer, so that the squib resistance value can be diagnosed by a microcomputer. Also, the relative accuracy of the output voltages is guaranteed to be within ±10%. (4) Squib driver MOSFET diagnostic function (diagnostic voltage output) When the squib driver is turned on while the safing sensor is in normal state, the drain voltage of the MOSFET is output via the analog multiplexer, making it possible to diagnose the state of the MOSFET using a microcomputer. (5) Diagnostic chip select function Since the device has a chip select function, the diagnostic control bits can be minimized when the application circuit is configured with multiple chips. Furthermore, when a chip is not selected, the diagnostic output pin AO is placed in the high-impedance state; therefore it is possible to diagnose multiple chips using a 1-channel CPU A/D port. (Ignition operates irrespective of CS.) (6) Input INHIBIT function The purpose of this function is to prevent erroneous ignition due to a fault in the microcomputer or the system power supply. It allows for ignition to be inhibited by pulling the ENB pin low. 5 2006-10-31 TPD2004F Absolute Maximum Rating (Ta = -40~85°C) Characteristics Symbol Rating VBB 30 VCC 10 SS 30 VIN -0.5~7 Backup Capacitor Capacitance CM 1500 (1ch) μF Backup Capacitor Charging Voltage CV 25 V Squib ON-Time tON 15 ms Squib Driver Current (channel) ISQ 10 A Power Dissipation PD 0.8 W Operating Temperature Topr -40~85 °C Junction Temperature Tj 150 °C Storage Temperature Tstg -55~150 °C Power Supply Voltage Input Voltage Unit V V Note1: The squib driver uses a 60V tolerant output device. However, this does not guarantee that the squib tolerates 60V because this varies with the withstand voltages of peripheral circuits. Note2: Using continuously under heavy loads (e.g. the application of high temperature/current/voltage and the significant change in temperature, etc.) may cause this product to decrease in the reliability significantly even if the operating conditions (i.e. operating temperature/current/voltage, etc.) are within the absolute maximum ratings and the operating ranges. Please design the appropriate reliability upon reviewing the Toshiba Semiconductor Reliability Handbook (“Handling Precautions”/Derating Concept and Methods) and individual reliability data (i.e. reliability test report and estimated failure rate, etc). 6 2006-10-31 TPD2004F Electrical Characteristics (Tj = -40~85°C) Characteristics Operating Supply Voltage Symbol Test Condition Min Typ. Max VBB ― 4 ― 25 VCC ― 4.75 ― 5.25 VBB = 24V, when diagnosed, CCRef = 20kΩ ― 35 100 VBB = 24V, when not diagnosed ― 0.1 1 VCC = 5.25V, when diagnosed ― 5 10 VCC = 5.25V, when not diagnosed ― 3 6 VIL INPUT “L” ― ― VCC× 0.3 VIH INPUT “H” VCC× 0.7 ― ― VIN = 0V (Pull-down) ― ― ±10 VIN = 0V (Pull-up) ― -50 -200 VIN = VCC (Pull-down) ― 50 200 VIN = VCC (Pull-up) ― ― ±10 VBB = 9V, VCC = 4.75V, ID = 1A ― 0.6 1 VBB = 9V, VCC = 4.75V, ID = 3A ― 0.7 1.2 VOUT = 25V ― ― 0.1 VOUT = VCC ― ― 0.1 VOUT = 25V ― ― 1 AMPGAIN VCC = 4.75V, AMPVCOMM = 3V, Tj = 25°C 18 20 22 AMPOFFSET VCC = 4.75V, AMPVCOMM = 3V, Tj = 25°C ― ― ±10 mV AMPVDEF VCC = 4.75V, ISH = 100mA, AMPVCOMM = 3V, Tj = 25°C 200 ― ― mV IBB Supply Current ICC Input Voltage IIL Input Current IIH Squib Driver ON-Resistance Squib Driver Output Leakage Current RDS (ON) SQ High Side IOLSQ (H) Low Side IOLSQ (L) Diagnostic Amp Amplification Factor Diagnostic Amp Offset Voltage Diagnostic Amp Differential Input Voltage Range Diagnostic Amp In-phase Input Voltage Range Diagnostic Amp Output Saturation Voltage Diagnostic Constant-current Source V mA V μA Ω mA AMPVCOMM ― 3.0 ― ― V VAMPSAT ― VCC-1 ― ― V CCRef = 20kΩ 28 35 45 mA VDIAGSQ RSQ = 2Ω, ISH = 35mA, IAO = 5μA 900 1400 1900 VDIAGREF RREF = 2Ω, ISH = 35mA, IAO = 5μA 900 1400 1900 VDIAGDEV RSQ = RREF = 2Ω, ISH = 35mA, IAO = 5μA -10 0 10 ISHDIAGCC Diagnostic Output Voltage Diagnostic Output Relative Accuracy Unit 7 mV % 2006-10-31 TPD2004F Characteristics Symbol Test Condition Min Typ. Max R1 ― 40 80 280 R2 ― 10 20 70 Diagnostic Voltage Dividing Ratio VDIV ― 0.17 0.2 0.23 ― Diagnostic Resistance Relative Accuracy RDEV -5 0 5 % Switching Time (High-side SW) TPLH ― 100 200 ― 10 50 ― 10 50 Diagnostic Resistance Value TPHL TPLH Switching Time (Low-side SW) Diagnosis Switchover Time Note: VBB = 25V, Rload, ID = 3A TPHL ― 10 50 High-side Driver Diagnosis TDLH ― 120 250 TDHL ― 50 100 Low-side Driver Diagnosis TDLH ― 20 80 ― 40 80 TDLH ― 30 60 TDHL ― 50 100 Other Diagnosis Note: (Measured between SS1, SQ1-, SS2, SQ2-) TDHL VBB = 25V, Rload, R = 2Ω Unit kΩ μs μs The short diagnosis monitor current in cases when the CCADJ pin is shorted to GND is 100mA (max) (at all temperatures). Short diagnosis must be completed within 15ms. 8 2006-10-31 TPD2004F Package Dimensions Weight: 0.29g (typ.) 9 2006-10-31 TPD2004F RESTRICTIONS ON PRODUCT USE 20070701-EN • The information contained herein is subject to change without notice. • TOSHIBA is continually working to improve the quality and reliability of its products. Nevertheless, semiconductor devices in general can malfunction or fail due to their inherent electrical sensitivity and vulnerability to physical stress. It is the responsibility of the buyer, when utilizing TOSHIBA products, to comply with the standards of safety in making a safe design for the entire system, and to avoid situations in which a malfunction or failure of such TOSHIBA products could cause loss of human life, bodily injury or damage to property. In developing your designs, please ensure that TOSHIBA products are used within specified operating ranges as set forth in the most recent TOSHIBA products specifications. Also, please keep in mind the precautions and conditions set forth in the “Handling Guide for Semiconductor Devices,” or “TOSHIBA Semiconductor Reliability Handbook” etc. • The TOSHIBA products listed in this document are intended for usage in general electronics applications (computer, personal equipment, office equipment, measuring equipment, industrial robotics, domestic appliances, etc.).These TOSHIBA products are neither intended nor warranted for usage in equipment that requires extraordinarily high quality and/or reliability or a malfunction or failure of which may cause loss of human life or bodily injury (“Unintended Usage”). Unintended Usage include atomic energy control instruments, airplane or spaceship instruments, transportation instruments, traffic signal instruments, combustion control instruments, medical instruments, all types of safety devices, etc.. Unintended Usage of TOSHIBA products listed in his document shall be made at the customer’s own risk. • The products described in this document shall not be used or embedded to any downstream products of which manufacture, use and/or sale are prohibited under any applicable laws and regulations. • The information contained herein is presented only as a guide for the applications of our products. No responsibility is assumed by TOSHIBA for any infringements of patents or other rights of the third parties which may result from its use. No license is granted by implication or otherwise under any patents or other rights of TOSHIBA or the third parties. • Please contact your sales representative for product-by-product details in this document regarding RoHS compatibility. Please use these products in this document in compliance with all applicable laws and regulations that regulate the inclusion or use of controlled substances. Toshiba assumes no liability for damage or losses occurring as a result of noncompliance with applicable laws and regulations. 10 2006-10-31