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| automotive ic gate driver AUIR3241S 1 rev 1 .0 1 2017 - 09 - 12 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 applications ? power switch for stop and start board net stabilizer ? battery switc h product summary operating voltage 3 - 36v vgate 1 1.5 v min. i v cc average o n 45 a max. at 25c i v cc average off 35 a max. at 25c package so8 description the AUIR3241S is a high side m osfet 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 g ate driver. it drives standard level mosfet even at low battery voltage. t he 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 numb er package type standard pack complete part number form quantity AUIR3241S soic8 tape and reel 2500 AUIR3241Str
AUIR3241S 2 rev 1.01 20 1 7 - 09 - 12 typical connection C back to back typical connection C q_diode s w in AUIR3241S g nd v cc cout 1 00h main battery loads rs r s current measurement rin o ut gate source 18v cin rg s w in AUIR3241S g nd v cc cout 1 00h main battery loads rs r s current measurement rin o ut gate source 18v cin rg AUIR3241S 3 rev 1.01 20 1 7 - 09 - 12 typical connection C battery switch s w in AUIR3241S g nd v cc cout 1 00h main battery loads rs r s current measurement rin o ut gate source 18v cin rg AUIR3241S 4 rev 1.01 20 1 7 - 09 - 12 absolute maximum ratings absolute maximum ratings indicate sustained limits beyond which damage to the device may occur. symbol parameter min. max. units vcc - gnd maximum vcc voltage - 0.3 65 v vsw - gnd maximum s w voltage vrs - 0. 3 vout+vf vsw - vrs maximum sw voltage - 0.3 65 vout - vcc maximum vout - vcc voltage - 0.3 65 vout - gnd maximum vout voltage - 0.3 65 vout - vgate maximum vout - vgate voltage - 0.3 65 vgate - vsource maximum vgate - vsource voltage - 0.3 75 vout - vsource maximum vout - vsource voltage - 0.3 75 vrs - gnd maximum rs pin voltage - 0.3 6 vin - gnd maximum in pin voltage - 0.3 v out+0.3 isw maximum continuous current in sw pin ? ? ? thermal characteristics symbol parameter typ. max. units rth thermal resistance junction to ambient 100 ? c/w recommended operating conditions symbol parameter min. max. units vih high level input voltage 2.5 5.5 v vil low level input voltage 0 0. 8 AUIR3241S 5 rev 1.01 20 1 7 - 09 - 12 static electrical characteristics tj= - 40..1 25c, vcc= 6.. 1 6 v (unless otherwise specified), typical value are given for vcc=14v and tj=25c. symbol parameter min. typ. max. units test conditions vcc op (ext) . supply voltage range for extended operation (some parameters may be downgraded beyond nominal operation) 3 ? (1) supply voltage range for nominal operation 6 ? 16 iq vcc off (2) supply current when off, tj=25c ? ? (2) supply current when on, tj=25c ? ? (2) quiescent current on o ut pin , tj=25c ? 10 15 vin= 0 v,k1 /k2 off , k3 on , vout - vcc=14v quiescent current on out pin , tj=125c ? 1 3 25 iq o ut on (2) quiescent current on out pin , tj=25c ? 12 2 0 vin= 5 v,k1 /k3 off , k2 on, vout - vcc=14v quiescent current on out pin , tj=125c ? 1 5 30 vbr o ut breakdown voltage between out and source 75 90 ? ? ? 3 6 a vin=5v vin _ th i nput voltage threshold 0.8 1.5 2.5 v v out _ th o utput voltage threshold 11.5 12.5 1 4 uv_lo undervoltage lockout between vout and vcc 6.5 8 10 see figure 7 vout_th C ? ? ? ? ? ? ? 25 ? i=100ma rdson k3 rdson of k3, tj=25c ? 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..125c, vcc=6..16v (unless otherwise specified), typical value are given for vcc=14v and tj=25c. symbol parameter min. typ. max. units test conditions toff off time 2 3 4 s see figure 4 tdon k1 turn - on delay of k1 ? ? ? ? 500 1 2 00 see figure 10 por_th power on reset threshold 6 6.5 7.5 v switching characteristics tj= - 40..125c, vcc=6..16v (unless otherwise specified), typical value are given for vcc=14v and tj=25c. symbol parameter min. typ. max. units test conditions tdo n gate turn - o n delay 0.5 1. 5 3 s tr gate rise time on gate 10 % to 9 0% of vout - vcc ? ? ? ? ? s see page 11 AUIR3241S 6 rev 1.01 20 1 7 - 09 - 12 lead definitions pin number symbol description 1 in input pin 2 gnd ground pin 3 rs current sense input pin 4 sw output of k1 5 source connection of the source pin of the mosfets 6 gate output of the gate driver 7 vcc power supply 8 o ut output of the boost converter lead assignments 1 2 3 4 so8 8 7 6 5 1 - in 2 - gnd 3 - rs 4 - sw 5 - source 6 - gate 7 - vcc 8 - o ut AUIR3241S 7 rev 1.01 20 1 7 - 09 - 12 block diagram 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 . figure 1 v out >ov sw in o ut gnd vcc k1 k2 1 00h vcc rs 75 v d - + - + 75v 1v vout _ th 1.5m ? 6 v 150k ? 75v 6 v 3 s toff gate s ource 75 v k 3 s r q q s r q q vout - vcc> vout _ th vout - vcc AUIR3241S 9 rev 1.01 20 1 7 - 09 - 12 timing definition figure 4 figure 5 low quiescent current operation when on. the auir324 1 s is able to operate with a very low quiescent current on the vcc pin. nevertheless the supply current depends also on the leakag e of the power mosfet named i q 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 curr ent when k1 is on and off. the average current on the vcc pin can be calculated using: i vcc average on = ( iq gate + iq out on ) ? vout ? vcc + vf vcc + iq vcc on + iq out on i vcc average off = ( iq gate + iq out off ) ? vout ? vcc + vf vcc + iq vcc off + iq out off with vout : the average voltage on the output. vout average = ( vout peak + vout th ) / 2 v out peak can be calculated by: vout peak = l cout . ipeak 2 + vout th 2 vcc ik1 v out - vcc toff ipeak v out_ th i l i peak tdischarge ton t v out peak vrs v out - vcc vrs th v out _th t don k1 tdoff k1 AUIR3241S 10 rev 1.01 20 1 7 - 09 - 12 during on operation, the dc/dc works in pulse mode, meaning each time the v out - vcc voltage comes below 12.5v, the auir324 1 s switch es on k1 to recharge the gate voltage. when the iout leakage is low enough to maintain the dc/dc in discontinuous mode, the freq uency is calculate by: t = ipeak 2 ? 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. figure 6 the peak current and ton can be calculated as follow: t vrsth = ? l rdon k1 + rs + rl ? ln ( 1 ? rs + rdson k1 + rl vrs _ th ? rs ? vcc ) where rl is the resistor of the inductor with : t on = t vrs _ th + tdoff k1 the peak current can be solved by: ipeak = vcc rdson k1 + rs + rl ? ( 1 ? e ? ton ? rdson k1 + rs + rl l ) the peak current must not exceed the maximum rating of isw. vrs vrs _ th t doff k1 t vrs _ th t on AUIR3241S 11 rev 1.01 20 1 7 - 09 - 12 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 tr igger the under voltage lockout due to the gate charge of the power mosfet. cout > q gate total power mosfet ( vout th C uv lo ) min . - when k1 turn off and the inductor i s charging cout, the peak current on the o u t put 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 max 2 vz min gate is the minimum zener voltage of the external gate zener diode. minimum operating voltage while the auir324 1 s operating voltage is specified between 3 v 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 taki ng account all resistors which limit the inductor current. vcc min = rdson k1 + rs + rl rs ? vrsth over - voltage protection the auir324 1 s 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 v out th, meaning k2 is off and k3 is on. then the AUIR3241S power s the gate of the mosfet. if vout - vcc goes below uv_lo, the gate is short ed to the source and the part is latched. a cycle in the input is required to reset the la tc h. the input must be kept low longer than treset. 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 diagno stic can be analog or digital. vin v out - vcc v out _th uv_lo vg ate - v s ource normal operation short on the gate v out_th vrs AUIR3241S 12 rev 1.01 20 1 7 - 09 - 12 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. figure 8 then the average output current can be evaluated using : i out av = i rs av * vcc / ( v out - vcc ) knowing the output current can be useful to do a diagnostic on the power mosfet. if the gate is shorted, the output current w ill be significantly higher than in normal operation. d igital 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. 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 exceed s por_th. figure 10 g nd rs r s current measurement g nd rs r s digital diagnostic 5v vin v out v out_ th vcc vg ate - v s ource p or_ delay p or_ th AUIR3241S 13 rev 1.01 20 1 7 - 09 - 12 0 1 2 3 4 5 0 10 20 30 40 0 1 2 3 4 -50 0 50 100 150 iq out on, gate leakage current (a) tj, junction temperature (c) figure 11 C iq vcc on (a) vs tj (c) iq vcc on, supply leakage current (a) vcc, supply voltage (v) figure 12 C iq vcc on (a) vs vcc(v) iq vcc on, supply leakage current (a) 0 5 10 15 20 -50 0 50 100 150 figure 13 C iq out on (a) vs tj (c) tj, junction temperature (c) figure 14 C iq out on (a) vs vcc(v) vcc, supply voltage (v) iq out on, gate leakage current (a) 0 5 10 15 20 0 10 20 30 40 figures are given for typical value, vcc=14v and tj=25c otherwise specified AUIR3241S 14 rev 1.01 20 1 7 - 09 - 12 iq out o ff , gate leakage current (a) 0 1 2 3 4 5 0 10 20 30 40 0 1 2 3 4 -50 0 50 100 150 0 5 10 15 -50 0 50 100 150 0 5 10 15 0 10 20 30 40 iq out o ff , gate leakage current (a) tj, junction temperature (c) figure 1 5 C iq vcc o ff (a) vs tj (c) iq vcc o ff , supply leakage current (a) vcc, supply voltage (v) figure 1 6 C iq vcc o ff (a) vs vcc(v) iq vcc o ff , supply leakage current (a) figure 1 7 C iq out o ff (a) vs tj (c) tj, junction temperature (c) figure 1 8 C iq out o ff (a) vs vcc(v) vcc, supply voltage (v) AUIR3241S 15 rev 1.01 20 1 7 - 09 - 12 case outline C so8 AUIR3241S 16 rev 1.01 20 1 7 - 09 - 12 tape & reel so8 AUIR3241S 17 rev 1.01 20 1 7 - 09 - 12 part marking information qualification information qualification level automotive (per aec - q100) comments: this family of ics has passed an automotive qualification. irs industrial and consumer qualification level is granted by extension of the higher automotive level. moisture sensitivity level soic - 8 l msl 2 , 260c (per ipc/jedec j - std - 020 ) esd human body model class 1c passed 1500v ( per aec - q100 - 002 ) charged device model class c6 (+/ - 1000v) (per aec - q100 - 011 ) ic latch - up test class ii level a ( per aec - q100 - 004) rohs compliant yes AUIR3241S 18 rev 1.01 20 1 7 - 09 - 12 published by infineon technologies ag 81726 mnchen, 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 custom er s compliance with its obligations stated in this document and any applicable legal requirements, norms and standards concerning customers products and any use of the product of infineon technologies in customers applications. the data contained in t his document is exclusively intended for technically trained staff. it is the responsibility of customers technical departments to evaluate the suitability of the product for the intended application and the completeness of the product information given i n 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 o ffice ( 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 o ffice. 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. AUIR3241S 19 rev 1.01 20 1 7 - 09 - 12 revision history revision date notes/changes rev 1.0 2017 - 04 - 27 data sheet created. rev 1 .0 1 2017 - 09 - 12 update drawing, differentiate vcc_op (ext) & vcc_op (nom), add appendixies (1) & (2) on page 5 |
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