AUIR3240S

Automotive IC Automotive grade Gate driver AUIR3240S LOW QUIESCENT CURRENT MOSFET DRIVER Features       Product Summary Very low quiescent current on state Boost converter with integrated diode Standard level gate voltage Wide operating voltage 4-36V Temperature monitoring with NTC interface Lead-Free, Halogen Free, RoHS compliant Operating voltage 4-36V Vgate 11.5V min. Iqcc On 50µA max. Applications  Battery switch for Stop and Start system Package Description The AUIR3240S is a high side mosfet driver for battery switch application where a very low quiescent current is required when the driver is on. The AUIR3240S 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 is active low to reduce current consumption. SO8 Typical Connection Main Battery Loads GATE NTC NTC Cout VCC Rs Ntc V DG IN R Ntc NTC EN SW 500µH Current measurement RS /IN Rin Rs GND 1 Rev 1.1 2016-04-28 AUIR3240S 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 SOIC-8L MSL2, 260°C (per IPC/JEDEC J-STD-020) Class M0 (+/-50V) (per AEC-Q100-003) Class H0 (+/-50V) ESD Human Body Model (per AEC-Q100-002) Class C4 (+/-1000V) Charged Device Model (per AEC-Q100-011) IC Latch-Up Test Yes RoHS Compliant Yes † Qualification standards can be found at International Rectifier’s web site http://www.irf.com/ Machine Model 2 Rev 1.1 2016-04-28 AUIR3240S Absolute Maximum Ratings Absolute maximum ratings indicate sustained limits beyond which damage to the device may occur. All voltage parameters are referenced to Ground lead. (Tambient=25°C unless otherwise specified). Symbol Parameter Min. Max. Vcc-gnd Vgate-Vsw Vsw-gnd Vrs-gnd Vntc Vntc_en Vin Isw Tj max. Maximum Vcc voltage Maximum Vgate-Vsw voltage Maximum Sw voltage Maximum Rs voltage Maximum Ntc voltage Maximum NTC_EN voltage Maximum IN pin voltage Maximum continuous current in SW pin Max. storage & operating temperature junction temperature -0.3 -1 -0.3 -0.3 -0.3 -0.3 -0.3 -40 65 65 65 6 65 6 6 200 150 mA °C Typ. Max. Units 100  °C/W Min. Max. Units 2.5 0 4 4 5.5 0.9 10 10  Units V Thermal Characteristics Symbol Parameter Rth Thermal resistance junction to ambient Recommended Operating Conditions Symbol Parameter VIH VIL Rs NTC Rin High level input voltage Low level input voltage Serial NTC resistor Input resistor 3 Rev 1.1 V k 2016-04-28 AUIR3240S 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 Vcc op. Iq Vcc Off Operating voltage range Supply current when Off, Tj=25°C Supply current when Off, Tj=125°C Supply current when On, Tj=25°C Supply current when On, Tj=125°C Quiescent current on Gate, Tj=25°C Quiescent current on Gate, Tj=125°C Breakdown voltage between and Vcc Over-voltage protection between gate and gnd Input current IN threshold voltage Gate output threshold Rs threshold, Tj=-40°C Rs threshold, Tj=25°C Rs threshold, Tj=125°C Rdson of K1, Tj=-40°C Rdson of K1, Tj=25°C Rdson of K1, Tj=125°C Rdson of K2, Tj=-40°C Rdson of K2, Tj=25°C Rdson of K2, Tj=125°C Forward voltage of rectifier diode Quiescent current in NTC Iq Vcc On Iq gate On Vbr gate OV Iin Vin th Vgs th Vrs th Rdson K1 Rdson K2 Vf Iq ntc I Ntc Vth_ntc_en I ratio ntc Out Ntc current R ntc=7k, Vdg in=5V NTC_EN threshold voltage Current ratio between NTC_EN and NTC Min. Typ. Max. Units 4  V       85 110 2 3 6 12 17 55 36 120 200 10 10 20 40 20 60 30 2 12.5 1.1 1 0.95 8 11 15 22 35 60 0.7 0.1 65 2.5 13.5 1.3 1.2 1.2 13 15 20 40 45 75 1 1 µA 1 1.5 2.05  mA V 15 50  1 11.5 0.9 0.85 0.75          1.15 1.9 1.9 2.2 µA Test Conditions See page 10 Vin=5V, NTC_EN=0V K1 off, K2 on Vin=0V, NTC_EN=0V K1 off, see page 8 Vin=0V, Vgate=14V K1 off, see page 8 I=10mA V Vin=5V Igate=0µA V I=100mA  V µA I=100mA V NTC=16V, Vntc_en=0V Vntc>6V I=500µA Vntc>6V 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 Off time Turn-on delay of K1 Turn-off delay of K1 Min. Typ. Max. 5 7.5 10 0.2 10     Units Test Conditions µs 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 K2 Tf K2 Iout- K2 Turn-on delay of K2 Fall time of K2 90% to 10% of Vgate-Vcc Gate low short circuit pulsed current 4 Rev 1.1 Min. Typ. Max. Units 1 2.5 6 350 4 20 µs  mA  100 Test Conditions C=100nF Vgate=14V 2016-04-28 AUIR3240S Lead Definitions Pin number Symbol 1 NTC 2 3 4 5 6 7 8 NTC_EN /IN GND RS SW VCC GATE Description An NTC resistor can be connected between this pin and the Vcc line close to the tab to sense the temperature of the Mosfet NTC_EN is the input of the NTC system. Active low input pin to enable the boost converter or short the gate to Vcc Ground pin Current sense input pin Output of K1 Power supply Output of the boost converter Lead Assignments 8765 1234 SO8 5 Rev 1.1 1- NTC 2- NTC_EN 3- /IN 4- GND 5- RS 6- SW 7- VCC 8- GATE 2016-04-28 AUIR3240S Block diagram Main Battery Gate NTC 75V NTC + 6V 17V Vcc - 75V 500k NTC EN K2 12.5V 75V 75V D SW Current mirror 500µH Vgate>OV K1 /IN Rs 7.5µs + 1V - 6V 150k 6V 150k toff 50 Gnd 6 Rev 1.1 2016-04-28 AUIR3240S Description The topology of the AUIR3240S is a boost DC/DC converter working in current mode. K1 is switched on when the gate voltage is lower than Vgs threshold. When Rs pin reaches Vrs th, K1 is turned off and the inductor charge the gate capacitor through D. The system cannot restart during Toff after Vrs th has been reached. The DC/DC restart only when the Gate and the Vcc voltage difference is lower than 12.5V in order to achieve low quiescent current on the power supply. To turn off the power Mosfet, the input must be pull high. Then the DC/DC converter is turned and K2 shorts the gate to Vcc. Vin Ipeak Irs Vgs threshold Vgs Parameters definition Current definition Iq NTC Iq gate On NTC GATE Iq Vcc Off Iq Vcc On I out leakage VCC NTC EN SW /IN GND 7 Rev 1.1 RS 2016-04-28 AUIR3240S Timing definition Vin T Ipeak Ik1 Toff Vgate peak Vgsth VgateVcc Ipeak=Vrs th/Rs IL tdischarge ton Vgs threshold Vgate-Vcc Tdon K1 Tdoff K1 Vrsth Vrs Low quiescent current operation when On. The AUIR3240S 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 “I out leakage” 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: 8 Rev 1.1 2016-04-28 AUIR3240S Ivcc ave = (Iq gate + Iout leakage) ∗ Vgate − Vcc + Vf + Iq Vcc on + Iq gate on + Iq NTC Vcc With Vgate: the average voltage on the output. Vgate average = (Vgate peak + Vgsth)/2 Vgate peak can be calculated by: L Vgate peak = √ . Ipeak 2 + Vgsth2 Cout During On operation, the DC/DC works in pulse mode, meaning each time the Vgate-Vcc voltage comes below 12.5V, the AUIR3240S 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+Iout leakage)∗(Vgate−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. Vrsth Vrs t Vrsth tdoff K1 t on The peak current and ton can be calculated as follow: (Rs + Rk1 + Rl) ∗ Vrsth L ∗ ln(1 − ) Rk1 + Rs + Rl Rs ∗ Vcc Where Rl is the resistor of the inductor t Vrsth = − With : t on = t Vrsth + tdoff K1 The peak current can be solved by: Rk1+Rs+Rl Vcc L Ipeak = ∗ (1 − e−ton∗ ) Rk1 + Rs + Rl 9 Rev 1.1 2016-04-28 AUIR3240S Output voltage Characteristic In most of case when the output of the AUIR3240S is able to recharge the capacitor higher than Vgsth, the output voltage will oscillate between Vgsth and Vgate peak. Vgate peak can be calculated by: L Vgate peak = √ ∗ Ipeak 2 + Vgsth² Cout Minimum operating voltage While the AUIR3240S operating voltage is specified between 4V and 36V. The minimum voltage is limited by the fact that the Rs voltage must reach the Vrsth taking account all resistors which limit the inductor current. Rk1 + Rs + Rl Vcc min = ∗ Vrsth Rs Over-Voltage protection The AUIR3240S integrates an over-voltage protection in order to protect K1. When Vcc exceed the Over-voltage threshold, the DC/DC is stopped. NTC interface The NTC interface allows the system to have a temperature measurement of the mosfet using one resistor and one NTC. The NTC must be connected to Vcc and close to the tab of the power Mosfet to have a good temperature sensing. The system works as a current mirror between NTC_EN and NTC pins. The typical ratio is 2, with 500µA flowing into NTC_EN, 1mA will flow in the NTC. The current in the NTC is fixed by adjusting R_Ntc and V_Dg_In. With 7k and 5V, the current in the NTC will be 1mA. The NTC function activated only if NTC_EN is powered. If the NTC feature function is not used, NTC EN and NTC must be remained floating. The low consumption is achieved only when the NTC interface is not activated. Output current measurement The average current into Rs can be measured by adding a low pass filter before the ADC of the micro controller. Then the average output current can be evaluated using : I out av = I Rs av * Vcc / ( Vgate - Vcc ) Knowing the output current can be useful to do a diagnostic on the power Mosfet. If the gate is short, the output current will be significantly higher than in normal operation. 10 Rev 1.1 2016-04-28 AUIR3240S Figures are given for typical value, Vcc=14V and Tj=25°C otherwise specified 4 Iq Vcc on, supply leakage current (µA) Iq Vcc on, supply leakage current (µA) 4 3 2 1 0 -50 0 50 100 Tj, junction temperature (°C) 3 2 1 0 0 Figure 1 – Iq Vcc on (µA) Vs Tj (°C) 10 15 Vcc, Supply voltage (V) 20 Figure 2 – Iq Vcc on (µA) Vs Vcc(V) 15 6 10 5 0 -50 0 50 100 Tj, junction temperature (°C) Figure 3 – Iq Gate on (µA) Vs Tj (°C) 11 Rev 1.1 Iq Gate on, Gate leakage current (µA) Iq Gate on, Gate leakage current (µA) 5 5 4 3 2 1 0 0 5 10 15 Vcc, Supply voltage (V) Figure 4 – Iq Gate on (µA) Vs Vcc(V) 2016-04-28 20 AUIR3240S 1000 Vf, Forward voltage of the diode (mV) Iq Vcc off, supply leakage current (µA) 150 100 50 0 -50 0 50 100 Tj, junction temperature (°C) Figure 5 – Iq Vcc off (µA) Vs Tj (°C) 12 Rev 1.1 900 800 700 600 500 400 300 200 100 0 -50 0 50 100 Tj, junction temperature (°C) Figure 6 – Vf (mV) Vs Tj (°C) 2016-04-28 AUIR3240S Case Outline – SO8 13 Rev 1.1 2016-04-28 AUIR3240S Tape & Reel 14 SO8 Rev 1.1 2016-04-28 AUIR3240S Part Marking Information Ordering Information Base Part Number Standard Pack Package Type Complete Part Number Form AUIR3240S 15 SOIC8 Rev 1.1 Tape and reel Quantity 2500 AUIR3240STR 2016-04-28 AUIR3240S Published by Infineon Technologies AG 81726 München, Germany © Infineon Technologies AG 2015 All Rights Reserved. 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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. 16 Rev 1.1 2016-04-28 AUIR3240S Revision History Revision Date Notes/Changes A B December 10th, 2011 March, 28th 2012 C April, 2nd 2012 D E F July, 17th 2012 November, 19th 2012 October, 17th 2013 G H October 31, 2014 October 10, 2015 I J 1.1 December 21, 216 April 11, 2016 April 28, 2016 Initial release Page4 correct temperature condition for Vrsth +125°C Update maximum operating temperature Update page 4, Tdon K1 typ. Update formula page 9 tVrsth Update NTC interface current page10 Update limit max Rdson K2 Update the template Update OV definition Update ordering information Update Ivcc formula page 9 Update Tdon K1 and Tdoff K1 Update revision name 17 Rev 1.1 2016-04-28