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AUIR3240S 1 www.irf.com ? 20 13 international rectifier submit datasheet feedback o ctober 21, 2013 automotive grade low quiescent current mosfet driver features ? 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 compl iant applications ? battery switch for stop and start system description the auir3240 s 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. product summary operating voltage 4 - 36v vgate 1 1.5 v min . i qcc o n 50a max. package so8 typical connection sw / in g ate g nd v cc cout 500h main battery loads v dg in ntc en ntc ntc r ntc rs r s current measurement rs ntc rin
AUIR3240S 2 www.irf.com ? 20 13 international rectifier submit datasheet feedback o ctober 21, 2013 qualification information ? qualification level automotive (per aec - q100 ?? ) comments: this family of ics has passed an automotive qualifi cation. ir?s 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 machine model class m 0 (+/ - 5 0v) (per aec - q100 - 003) human bod y model class h 0 (+/ - 5 0v) ( per aec - q100 - 002 ) charged device model class c4 (+/ - 1000v) (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/ ?? exceptions to aec - q100 requirements, if any, are noted in the qualification report.
AUIR3240S 3 www.irf.com ? 20 13 international rectifier submit datasheet feedback o ctober 21, 2013 absolute maximum ratings absolute maximum ratings indicate sustained limits beyond which damage to the device may occur. all voltage pa rameters are referenced to ground lead. (tambient=25c unless otherwise specified). symbol parameter min. max. units vcc - gnd maximum vcc voltage - 0.3 65 v vgate - vsw maximum vgate - vsw voltage - 1 65 vsw - gnd maximum sw voltage - 0.3 65 vrs - gnd maximum rs voltage - 0.3 6 v n tc maximum ntc voltage - 0.3 65 vntc_en maximum ntc_en voltage - 0.3 6 vin maximum in pin voltage - 0.3 6 isw maximum continuous current in sw pin ? 200 ma tj max. max. storage & operating temperature junction temperature - 40 1 50 c 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 .9 rs ntc serial ntc resistor 4 10 k ? rin input resistor 4 10
AUIR3240S 4 www.irf.com ? 20 13 international rectifier submit datasheet feedback o ctober 21, 2013 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 condit ions vcc op. operating voltage range 4 ? 36 v see page 10 iq vcc off supply current when off, tj=25c ? 85 120 a vin=5v, ntc_en=0v k1 off , k2 on supply current when off, tj=125c ? 110 200 iq vcc on supply current when on, tj=25c ? 2 10 vin=0v, n tc_en=0v k1 off, see page 8 supply current when on, tj=125c ? 3 10 iq gate o n quiescent current on gate, tj=25c ? 6 20 vin= 0 v, vgate=14v k1 off, see page 8 quiescent current on gate, tj=125c ? 12 40 vbr gate breakdown voltage between and vcc 15 17 20 v i=10ma ov over - voltage protection 50 55 6 0 iin input current ? 30 65 a vin=5v vin th in threshold voltage 1 2 2.5 v vgs th gate output threshold 11.5 12.5 13.5 igate=0a vrs th rs threshold, tj= - 40c 0.9 1 .1 1.3 rs threshold, tj=2 5c 0.85 1 1.2 rs threshold, tj= 125c 0.75 0.95 1.2 rdson k1 rdson of k1, tj= - 40c ? 8 13 ? i=100ma rdson of k1, tj=25c ? 11 15 rdson of k1, tj=125c ? 15 20 rdson k2 rdson of k2, tj= - 40c ? 20 30 rdson of k2, tj=25c ? 25 35 rdson of k2, tj=125c ? 40 55 vf forward voltage of rectifier diode ? 0.7 1 v i=100ma iq ntc quiescent current in ntc ? 0.1 1 a v ntc=16v, vntc_en=0v i ntc out ntc current r ntc=7k, vdg in=5v ? 1 ? ma vntc>6v vth_ntc_en ntc_en threshold voltage 1.15 1.5 1.9 v i=500a i ratio ntc current ratio between ntc_en and ntc 1.9 2 .05 2.2 vntc>6v 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. ma x. units test conditions toff off time 5 7.5 10 s tdon k1 turn - on delay of k1 ? 0.2 ? tdoff k1 turn - off delay of k 1 ? 10 ? 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 k2 turn - o n delay of k2 1 2 .5 4 s c=100nf tf k2 fall time of k2 90% to 10% of vgate - vcc ? 6 20 i out - k2 gate low short circuit pulsed current 100 350 ? ma vgate=14v
AUIR3240S 5 www.irf.com ? 20 13 international rectifier submit datasheet feedback o ctober 21, 2013 lead definition s pin number symbol description 1 ntc an ntc resistor can be connected between this pin and the vcc line close to the tab to sense the temperature of the mosfet 2 ntc_en ntc_en is the input of the ntc system. 3 /in active low input pin to enable the bo ost converter or short the gate to vcc 4 gnd ground pin 5 rs current sense input pin 6 sw output of k1 7 vcc power supply 8 gate output of the boost converter lead assignments 1 2 3 4 so8 8 7 6 5 1 - ntc 2 - ntc_en 3 - /in 4 - gnd 5 - rs 6 - sw 7 - vcc 8 - gate
AUIR3240S 6 www.irf.com ? 20 13 international rectifier submit datasheet feedback o ctober 21, 2013 block diagram vcc>ov sw /in gate gnd vcc k1 k2 500h main battery ntc en ntc ntc rs current mirror 17v d - + 75v - + 75v 1v 12 .5 v 150k ? 6 v 150k ? 50 ? 75v 500k ? 6 v 7.5s toff 6 v 75v
AUIR3240S 7 www.irf.com ? 20 13 international rectifier submit datasheet feedback o ctober 21, 2013 de scription the topology of the auir3240 s 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 v rs th , k1 is turned off and the inductor charge the gate capacitor through d. the system cannot restart during toff after v rs 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, th e input must be pull high. then the dc/dc converter is turn ed and k2 shorts the gate to vcc. vin irs vgs ipeak vgs threshold parameters definition current definition /in gate gnd vcc ntc en ntc rs sw iq ntc i q gate on iq vcc off iq vcc on i out leakage
AUIR3240S 8 www.irf.com ? 20 13 international rectifier submit datasheet feedback o ctober 21, 2013 timing definition vin ik1 vg ate - vcc toff ipeak vgsth i l ipeak=vrs th/rs tdischarge ton t vgate peak vrs vgate - vcc vrsth vgs threshold t don k1 tdoff k1 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 th e current when k1 is on and off. the average current on the vcc pi n can be calculated using:
AUIR3240S 9 www.irf.com ? 20 13 international rectifier submit datasheet feedback o ctober 21, 2013 with vgate: the average voltage on the output. vgate peak can be calculated by: 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 k 1 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: 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 ( t doff k1), the inductor current will exceed the threshold set by: 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 vrsth t doff k1 t vrsth t on the peak current and ton can be calculate d as follow: where rl is the resistor of the inductor with : the peak current can be solve d by:
AUIR3240S 10 www.irf.com ? 20 13 international rectifier submit datasheet feedback o ctober 21, 2013 output volta ge 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: minimum operating voltage while the AUIR3240S operating voltage is specified between 4 v 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. over - voltage protection the AUIR3240S integr ates 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 500 a flowing into ntc_en, 1ma will flow i n the ntc. t he current in the ntc is fixed by adjus ting r_ntc and v_dg_in. with 7 k and 5v, the current in the n tc 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 eva luated 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.
AUIR3240S 11 www.irf.com ? 20 13 international rectifier submit datasheet feedback o ctober 21, 2013 iq gate on, gate leakage current (a) tj, junction temperature (c) figure 1 ? iq vcc on (a) vs tj (c) 0 1 2 3 4 -50 0 50 100 iq vcc on, supply leakage current (a) vcc, supply voltage (v) figure 2 ? iq vcc on (a) vs vcc(v) 0 1 2 3 4 0 5 10 15 20 iq vcc on, supply leakage current (a) 0 5 10 15 -50 0 50 100 figure 3 ? iq gate on (a) vs tj (c) tj, jun ction temperature (c) figure 4 ? iq gate on (a) vs vcc(v) vcc, supply voltage (v) iq gate on, gate leakage current (a) 0 1 2 3 4 5 6 0 5 10 15 20 figu res are given for typical value, vcc=14v and tj=25c otherwise specified
AUIR3240S 12 www.irf.com ? 20 13 international rectifier submit datasheet feedback o ctober 21, 2013 iq vcc off, supply leakage current (a) 0 50 100 150 -50 0 50 100 figure 5 ? iq vcc off (a) vs tj (c) tj, junction temperature (c) vf, forward voltage of the diode (mv) 0 100 200 300 400 500 600 700 800 900 1000 -50 0 50 100 figure 6 ? vf ( mv ) vs tj (c) tj, junction temperature (c)
AUIR3240S 13 www.irf.com ? 20 13 international rectifier submit datasheet feedback o ctober 21, 2013 case outline ? so8
AUIR3240S 14 www.irf.com ? 20 13 international rectifier submit datasheet feedback o ctober 21, 2013 tape & reel so8
AUIR3240S 15 www.irf.com ? 20 13 international rectifier submit datasheet feedback o ctober 21, 2013 part marking information ordering information base part number package type standard pack complete pa rt number form quantity AUIR3240S soic8 tube 95 AUIR3240S tape and reel 2500 AUIR3240Str
AUIR3240S 16 www.irf.com ? 20 13 international rectifier submit datasheet feedback o ctober 21, 2013 important notice unless specifically designated for the automotive market, international rectifier corporation and its subsidiaries (ir) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or services without notice. part numbers designated with the ?au? prefix follow automotive industry an d / or customer specific requirements with regards to product discontinuance and process change notification. all products are sold subject to ir?s terms and conditions of sale supplied at the time of order acknowledgment. ir warrants performance of its h ardware products to the specifications applicable at the time of sale in accordance with ir?s standard warranty. testing and other quality control techniques are used to the extent ir deems necessary to support this warranty. except where mandated by gove rnment requirements, testing of all parameters of each product is not necessarily performed. ir assumes no liability for applications assistance or customer product design. customers are responsible for their products and applications using ir component s. to minimize the risks with customer products and applications, customers should provide adequate design and operating safeguards. reproduction of ir information in ir data books or data sheets is permissible only if reproduction is without alteration a nd is accompanied by all associated warranties, conditions, limitations, and notices. reproduction of this information with alterations is an unfair and deceptive business practice. ir is not responsible or liable for such altered documentation. informa tion of third parties may be subject to additional restrictions. resale of ir products or serviced with statements different from or beyond the parameters stated by ir for that product or service voids all express and any implied warranties for the associ ated ir product or service and is an unfair and deceptive business practice. ir is not responsible or liable for any such statements. ir products are not designed, intended, or authorized for use as components in systems intended for surgical implant int o the body, or in other applications intended to support or sustain life, or in any other application in which the failure of t he ir product could create a situation where personal injury or death may occur. should buyer purchase or use ir products for an y such unintended or unauthorized application, buyer shall indemnify and hold international rectifier 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 ir was negligent regarding the design or manufacture of the product. only products cer tified as military grade by the defense logistics agency (dla) of the us department of defense, are designed and manufactured to meet dla military specifications required by certain military, aerospace or other applications. buyers acknowledge and agree th at any use of ir products not certified by dla as military - grade, in applications requiring military grade products, is solely at the buyer?s own risk and that they are solely responsible for compliance with all legal and regulatory requirements in connect ion with such use. ir products are neither designed nor intended for use in automotive applications or environments unless the specific ir products are designated by ir as compliant with iso/ts 16949 requirements and bear a part number including the design ation ?au?. buyers acknowledge and agree that, if they use any non - designated products in automotive applications, ir will not be responsible for any failure to meet such requirements. for technical support, please contact ir?s technical assistance center http://www.irf.com/technical - info/ world headquarters: 101 n. sepulveda blvd., el segundo, california 90245 tel : (310) 252 - 7105
AUIR3240S 17 www.irf.com ? 20 13 international rectifier submit datasheet feedback o ctober 21, 2013 revision history revision date notes/changes a december 1 0 th, 2011 initial release b march, 28 th 2012 page4 correct temperature condition for vrsth +125c c april, 2 nd 2012 update maximum operating temperature d july, 17 th 2012 update page 4, tdon k1 typ. e november, 19 th 2012 update formula page 9 tvrsth f october, 17 th 2013 update ntc interface current page10

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