AUIR3241STR

Automotive IC Gate driver AUIR3241S Automotive grade LOW QUIESCENT CURRENT BACK TO BACK MOSFET DRIVER Features          Very low quiescent current on and off state Back to back configuration Boost converter with integrated diode Standard level gate voltage Input active high and 3.3V compatible Under voltage lockout with diagnostic Wide operating voltage 3-36V Ground loss protection Lead-Free, Halogen Free, RoHS compliant Product Summary Operating voltage 3-36V Vgate 11.5V min. I Vcc average On 45µA max. at 25°C I Vcc average Off 35µA max. at 25°C Applications   Power switch for Stop and Start board net stabilizer Battery switch Package SO8 Description The AUIR3241S is a high side Mosfet driver for back to back topology targeting back to back switch. It features a very low quiescent current both on and off state. The AUIR3241S is a combination of a boost DC/DC converter using an external inductor and a gate driver. It drives standard level Mosfet even at low battery voltage. The input controls the gate voltage. The AUIR3241S integrates an under voltage lock out protection to prevent to drive the Mosfet in linear mode. Ordering Information Base Part Number Standard Pack Package Type Complete Part Number Form AUIR3241S 1 Rev 1.01 SOIC8 Tape and reel Quantity 2500 AUIR3241STR 2017-09-12 AUIR3241S Typical Connection – Back to Back Main Battery Loads Out Cout AUIR3241S VCC Cin Gate Rg IN 18V Source Rin Sw 100µH Current measurement Rs GND Rs Typical Connection – Q_diode Main Battery Loads Out Cout AUIR3241S VCC Cin Gate Rg IN 18V Source Rin Sw 100µH Current measurement Rs GND Rs 2 Rev 1.01 2017-09-12 AUIR3241S Typical Connection – Battery switch Main Battery Loads Out Cout AUIR3241S VCC Cin Gate Rg IN 18V Source Rin Sw 100µH Current measurement Rs GND Rs 3 Rev 1.01 2017-09-12 AUIR3241S Absolute Maximum Ratings Absolute maximum ratings indicate sustained limits beyond which damage to the device may occur. Symbol Parameter Vcc-gnd Vsw-gnd Vsw-Vrs Vout-Vcc Vout-gnd Vout-Vgate Vgate-Vsource Vout-Vsource Vrs-gnd Vin-gnd Isw ID Rg Maximum Vcc voltage Maximum Sw voltage Maximum Sw voltage Maximum Vout-Vcc voltage Maximum Vout voltage Maximum Vout-Vgate voltage Maximum Vgate-Vsource voltage Maximum Vout-Vsource voltage Maximum Rs pin voltage Maximum IN pin voltage Maximum continuous current in Sw pin Maximum continuous current in the rectifier diode Minimum gate resistor Maximum operating junction temperature Maximum storage temperature Tj max. Min. Max. -0.3 Vrs-0.3 -0.3 -0.3 -0.3 -0.3 -0.3 -0.3 -0.3 -0.3   65 Vout+Vf 65 65 65 65 75 75 6 Vout+0.3 200 200 Units 100 -40 -55  Ohm 150 150 °C V mA Thermal Characteristics Symbol Parameter Rth Thermal resistance junction to ambient Typ. Max. Units 100  °C/W Min. Max. Units 2.5 0 5.5 0.8 Recommended Operating Conditions Symbol Parameter VIH VIL High level input voltage Low level input voltage 4 Rev 1.01 V 2017-09-12 AUIR3241S Static Electrical Characteristics Tj=-40..125°C, Vcc=6..16V (unless otherwise specified), typical value are given for Vcc=14V and Tj=25°C. Symbol Parameter Min. Typ. Max. Units Test Conditions Supply voltage range for extended operation (some Vcc op (ext). parameters may be downgraded beyond nominal 3  36 V See page 11 operation)  Vcc op (nom). (1) Supply voltage range for nominal operation 6 16  Iq Vcc Off (2) Supply current when Off, Tj=25°C 2 6 Vin=0V,K1/K2 off, K3 on, Vout-Vcc=14V  Supply current when Off, Tj=125°C 3 8  Iq Vcc On (2) Supply current when On, Tj=25°C 3 6 Vin=5V,K1/K3 off, µA K2 on, Vout-Vcc=14V  Supply current when On, Tj=125°C 4 8  Iq Out Off (2) Quiescent current on Out pin, Tj=25°C 10 15 Vin=0V,K1/K2 off, K3 on, Vout-Vcc=14V  Quiescent current on Out pin, Tj=125°C 13 25  Iq Out On (2) Quiescent current on Out pin, Tj=25°C 12 20 Vin=5V,K1/K3 off, K2 on, Vout-Vcc=14V  Quiescent current on Out pin, Tj=125°C 15 30  Vbr Out Breakdown voltage between Out and Source 75 90 I=10mA  Vbr Gate Breakdown voltage between Gate and Source 75 90 V I=10mA OV Over-voltage protection between Vout and Gnd 50 55 62  Iin Input current 3 6 µA Vin=5V Vin_th Input voltage threshold 0.8 1.5 2.5 Vout_th Output voltage threshold 11.5 12.5 14 UV_LO Undervoltage lockout between Vout and Vcc 6.5 8 10 V See figure 7  Vout_th–UV_LO Output voltage minus Undervoltage lockout threshold 3 4.5 Vrs th Rs threshold 0.8 1 1.3 I latch UV_LO Under voltage lockout Latch current between Vout and 10 25 40 See page 11 mA Vcc  Vf Forward voltage of rectifier diode 0.9 1.1 V I=100mA, Tj=25°C  Rdson K1 Rdson of K1, Tj=-40°C 8 13 I=100mA, Vout-Vcc=12.5V  Rdson of K1, Tj=25°C 11 15  Rdson of K1, Tj=125°C 15 20    Rdson K2 Rdson of K2, Tj=25°C 25 I=100mA   Rdson K3 Rdson of K3, Tj=25°C 25 (1) If the part is supply outside of this range (ex: during ramp up of Vcc), other values in this table might not be guaranteed (2) Supply current might be higher than specified during the start-up of the part (especially during the charge of Cout) Timing Converter Characteristics Tj=-40..125°C, Vcc=6..16V (unless otherwise specified), typical value are given for Vcc=14V and Tj=25°C. Symbol Parameter Toff Tdon K1 Tdoff K1 POR_Delay POR_Th Off time Turn-on delay of K1 Turn-off delay of K1 Power On Reset delay Power On Reset threshold Min. Typ. Max. 2 3 5 0.2 500 6.5 4   200 6   1200 7.5 Units Test Conditions See figure 4 µs See figure 5 See figure 10 V Switching Characteristics Tj=-40..125°C, Vcc=6..16V (unless otherwise specified), typical value are given for Vcc=14V and Tj=25°C. Symbol Parameter Tdon gate Tr gate Igate+ Tdoff gate Tf gate IgateTreset Turn-on delay Rise time on gate 10% to 90% of Vout-Vcc Gate high short circuit pulsed current Turn-off delay Fall time on gate 90% to 10% of Vout-Vcc Gate low short circuit pulsed current Time to reset the under voltage latches 5 Rev 1.01 Min. Typ. Max. Units 0.5 1. 5 6 350 2 6 350 1 3 15 µs  mA 5 15 µs  100 0.5  100   100 mA µs Test Conditions Cgate=100nF Vgate-Vsource=0V Cgate=100nF Vgate-Vsource=14V See page 11 2017-09-12 AUIR3241S Lead Definitions Pin number Symbol 1 2 3 4 5 6 7 8 IN GND RS SW Source Gate Vcc Out Description Input pin Ground pin Current sense input pin Output of K1 Connection of the source pin of the Mosfets Output of the gate driver Power supply Output of the boost converter Lead Assignments 8765 1234 SO8 6 Rev 1.01 1- IN 2- GND 3- RS 4- SW 5- Source 6- Gate 7- Vcc 8- Out 2017-09-12 AUIR3241S Block diagram Vcc Out Vout-VccVout_th UV_LO Latch S Q S Q R Q R Q 25mA 75V K2 + Vcc Gate Vout_th Power On Reset 75V 75V 75V D 75V K3 75V Source SW 100µH K1 Vout>OV IN 75V 10k 6V 3µs + Rs 10k 1V - 6V 150k 75V 1.5M toff Gnd Input Circuitry The input control circuitry drives the output gate driver stage. The input is active high. With a low level input voltage, the gate is shorted to the source. With a high level input, the output gate driver turn on when Vout reaches Vout_th. Vin Vgate - Vsource 90% 10% Tdon gate Tr gate Figure 1 7 Rev 1.01 2017-09-12 AUIR3241S Description The topology of the AUIR3241S is a boost DC/DC converter working in current mode. The DC/DC is working once the AUIR3241S is powered regardless the input level. K1 is switched on when the gate voltage is lower than Vout threshold. When Rs pin reaches Vrs th, K1 is turned off and the inductor charges the Out capacitor through D. The system cannot restart during Toff after Vrs th has been reached. The DC/DC restart only when the Out and the Vcc voltage difference is lower than Vout_th in order to achieve low quiescent current on the power supply. To turn off the power Mosfet, the input must be low. Then K2 is turned off and K3 shorts the gate to the source. Vcc Ipeak Irs Vout_th Vout-Vcc Figure 2 Parameters definition Current definition Iq Out Off Iq Out On Out Iq Vcc Off Iq Vcc On VCC GATE Iq gate IN Source SW RS GND Figure 3 8 Rev 1.01 2017-09-12 AUIR3241S Timing definition Vcc T Ipeak Ik1 Toff Vout peak Vout_th Vout-Vcc Ipeak IL tdischarge ton Figure 4 Vout_th Vout-Vcc Tdon K1 Tdoff K1 Vrs th Vrs Figure 5 Low quiescent current operation when On. The AUIR3241S is able to operate with a very low quiescent current on the Vcc pin. Nevertheless the supply current depends also on the leakage of the power mosfet named “Iq gate” on the diagram below. The leakage current is given when K1 is off. When K1 is on, the current flowing in Vcc is the current charging the inductor. Therefore the average current on the Vcc is the combination of the current when K1 is ON and OFF. The average current on the Vcc pin can be calculated using: Vout − Vcc + Vf + Iq Vcc on + Iq Out on Vcc Vout − Vcc + Vf I Vcc average off = (Iq gate + Iq Out Off) ∗ + Iq Vcc off + Iq Out off Vcc I Vcc average on = (Iq gate + Iq Out On) ∗ With Vout: the average voltage on the output. Vout average = (Vout peak + Vout th)/2 Vout peak can be calculated by: L Vout peak = √ . Ipeak 2 + Vout th2 Cout 9 Rev 1.01 2017-09-12 AUIR3241S During On operation, the DC/DC works in pulse mode, meaning each time the Vout-Vcc voltage comes below 12.5V, the AUIR3241S switches on K1 to recharge the gate voltage. When the Iout leakage is low enough to maintain the DC/DC in discontinuous mode, the frequency is calculate by: T= Ipeak2 ∗L 2∗(Iq gate+Iq Vout on)∗(Vout−Vcc+Vf) Peak current control The current in the inductor is limited by the 1V comparator which monitors the voltage across Rs. Due to the delay in the loop (tdoff K1), the inductor current will exceed the threshold set by: Vrsth Rs At low voltage, the current waveform in the inductor is not anymore linear, but exponential because the sum of the resistor of K1, the inductor and RS are not any more negligible. Vrs_th Vrs t Vrs_th tdoff K1 t on Figure 6 The peak current and ton can be calculated as follow: L Rs + Rdson k1 + Rl ∗ ln(1 − ) Rdon k1 + Rs + Rl Vrs_th ∗ Rs ∗ Vcc Where Rl is the resistor of the inductor t Vrsth = − With : t on = t Vrs_th + tdoff K1 The peak current can be solved by: Rdson k1+Rs+Rl Vcc L Ipeak = ∗ (1 − e−ton∗ ) Rdson k1 + Rs + Rl The peak current must not exceed the Maximum Rating of Isw. 10 Rev 1.01 2017-09-12 AUIR3241S Output capacitor choice The output capacitor must be chosen based on 2 criteria: During the turn on of K2, the voltage drop on Cout must not trigger the Under Voltage Lockout due to the gate charge of the Power Mosfet. Cout > - Q gate total Power Mosfet (Voutth –UVLO ) Min. When K1 turn off and the inductor is charging Cout, the peak current on the output capacitor must be limited in order to avoid having current flowing in the Gate zener diode: Cout > L ∗ Ipeak 2 max Vz min gate ² − Vout th max² Vz min gate is the minimum Zener voltage of the external gate Zener diode. Minimum operating voltage While the AUIR3241S operating voltage is specified between 3V and 36V. The 3V minimum operating voltage is when the Vcc is going down. The minimum voltage is also limited by the fact that the Rs voltage must reach the Vrsth taking account all resistors which limit the inductor current. Rdson k1 + Rs + Rl Vcc min = ∗ Vrsth Rs Over-Voltage protection The AUIR3241S integrates an over-voltage protection in order to protect K1. When Vcc exceed the Over-voltage threshold, the DC/DC is stopped. Under voltage lockout - Diagnostic In order to avoid to drive the Power Mosfet in linear mode, the AUIR3241S features an under voltage lockout. During the turn on, the gate will not be powered until Vout-Vcc reaches Vout th, meaning K2 is off and K3 is on. Then the AUIR3241S powers the gate of the mosfet. If Vout-Vcc goes below UV_LO, the gate is shorted to the source and the part is latched. A cycle in the input is required to reset the latch. The input must be kept low longer than Treset. Vin Vout-Vcc Vout_th UV_LO Vgate - Vsource Vout_th Vrs Normal Operation Short on the Gate Figure 7 When the part is latched a current source (I latch UV_LO) is connected between Out and Vcc to increase the current consumption. By monitoring the current consumption the system can have a diagnostic of the output status. The diagnostic can be analog or digital. 11 Rev 1.01 2017-09-12 AUIR3241S Analog Diagnostic: Output current measurement The average current into Rs can be measured by adding a low pass filter before the ADC of the micro controller. Current measurement Rs GND Rs Figure 8 Then the average output current can be evaluated using : I out av = I Rs av * Vcc / ( Vout - Vcc ) Knowing the output current can be useful to do a diagnostic on the power Mosfet. If the gate is shorted, the output current will be significantly higher than in normal operation. Digital diagnostic By adding a diode during high current consumption mode, the output voltage can be close to 1V. Using a bipolar with a pull-up resistor will provide a digital diagnostic. 5V Digital diagnostic Rs GND Rs Figure 9 Power On Reset During the power on, the AUIR3241S features a Power On Reset to guarantee a stable state of the 2 latches of the Under voltage lockout and guarantee a stable internal biasing. POR_Delay is triggered when Vout-Gnd exceeds POR_Th. Vin Vcc Vout Vout_th POR_Th Vgate - Vsource POR_Delay Figure 10 12 Rev 1.01 2017-09-12 AUIR3241S Figures are given for typical value, Vcc=14V and Tj=25°C otherwise specified 5 Iq Vcc on, supply leakage current (µA) Iq Vcc on, supply leakage current (µA) 4 3 2 1 0 0 50 100 2 1 150 0 10 20 30 Tj, junction temperature (°C) Vcc, Supply voltage (V) Figure 11 – Iq Vcc on (µA) Vs Tj (°C) Figure 12 – Iq Vcc on (µA) Vs Vcc(V) 40 20 Iq Out on, Gate leakage current (µA) 20 Iq Out on, Gate leakage current (µA) 3 0 -50 15 10 5 0 15 10 5 0 -50 13 4 0 50 100 150 0 10 20 30 Tj, junction temperature (°C) Vcc, Supply voltage (V) Figure 13 – Iq Out on (µA) Vs Tj (°C) Figure 14 – Iq Out on (µA) Vs Vcc(V) Rev 1.01 40 2017-09-12 AUIR3241S 5 Iq Vcc off, supply leakage current (µA) Iq Vcc off, supply leakage current (µA) 4 3 2 1 0 0 50 100 2 1 150 0 10 20 30 Tj, junction temperature (°C) Vcc, Supply voltage (V) Figure 15 – Iq Vcc off (µA) Vs Tj (°C) Figure 16 – Iq Vcc off (µA) Vs Vcc(V) 40 15 Iq Out off, Gate leakage current (µA) 15 Iq Out off, Gate leakage current (µA) 3 0 -50 10 5 0 10 5 0 -50 14 4 0 50 100 150 0 10 20 30 Tj, junction temperature (°C) Vcc, Supply voltage (V) Figure 17 – Iq Out off (µA) Vs Tj (°C) Figure 18 – Iq Out off (µA) Vs Vcc(V) Rev 1.01 40 2017-09-12 AUIR3241S Case Outline – SO8 15 Rev 1.01 2017-09-12 AUIR3241S Tape & Reel 16 SO8 Rev 1.01 2017-09-12 AUIR3241S Part Marking Information Qualification Information Automotive (per AEC-Q100) Comments: This family of ICs has passed an Automotive qualification. IR’s Industrial and Consumer qualification level is granted by extension of the higher Automotive level. Qualification Level Moisture Sensitivity Level ESD Human Body Model Charged Device Model IC Latch-Up Test RoHS Compliant 17 Rev 1.01 SOIC-8L MSL2, 260°C (per IPC/JEDEC J-STD-020) Class 1C Passed 1500V (per AEC-Q100-002) Class C6 (+/-1000V) (per AEC-Q100-011) Class II Level A (per AEC-Q100-004) Yes 2017-09-12 AUIR3241S Published by Infineon Technologies AG 81726 München, Germany © Infineon Technologies AG 2015 All Rights Reserved. IMPORTANT NOTICE The information given in this document shall in no event be regarded as a guarantee of conditions or characteristics (“Beschaffenheitsgarantie”). With respect to any examples, hints or any typical values stated herein and/or any information regarding the application of the product, Infineon Technologies hereby disclaims any and all warranties and liabilities of any kind, including without limitation warranties of non-infringement of intellectual property rights of any third party. In addition, any information given in this document is subject to customer’s compliance with its obligations stated in this document and any applicable legal requirements, norms and standards concerning customer’s products and any use of the product of Infineon Technologies in customer’s applications. The data contained in this document is exclusively intended for technically trained staff. It is the responsibility of customer’s technical departments to evaluate the suitability of the product for the intended application and the completeness of the product information given in this document with respect to such application. For further information on the product, technology, delivery terms and conditions and prices please contact your nearest Infineon Technologies office (www.infineon.com). WARNINGS Due to technical requirements products may contain dangerous substances. For information on the types in question please contact your nearest Infineon Technologies office. Except as otherwise explicitly approved by Infineon Technologies in a written document signed by authorized representatives of Infineon Technologies, Infineon Technologies’ products may not be used in any applications where a failure of the product or any consequences of the use thereof can reasonably be expected to result in personal injury. 18 Rev 1.01 2017-09-12 AUIR3241S Revision History Revision Date Notes/Changes Rev 1.0 Rev 1.01 2017-04-27 2017-09-12 Data Sheet created. Update drawing, Differentiate Vcc_op (ext) & Vcc_op (nom), add Appendixies (1) & (2) on Page 5 19 Rev 1.01 2017-09-12