February, 21st 2010 Automotive grade AUIPS71411G CURRENT SENSE HIGH SIDE SWITCH Features Product Summary Suitable 24V battery operation Over current shutdown Over temperature shutdown Current sensing Active clamp Low current ESD protection Optimized Turn On/Off for EMI Rds(on) 100m max. Vclamp 65V Current shutdown 5A min. Applications Solenoid 24V loads for trucks Packages Description The AUIPS71411G is a fully protected four terminal high side switch specifically designed for 24V battery application. It features current sensing, over-current, overtemperature, ESD protection and drain to source active clamp. When the input voltage Vcc - Vin is higher than the specified threshold, the output power Mosfet is turned on. When the Vcc - Vin is lower than the specified Vil threshold, the output Mosfet is turned off. The Ifb pin is used for current sensing. SO8 Typical Connection Vcc IPS IN Battery Out Ifb Current feeback Input On Off www.irf.com 10k Load 1.5k Logic Ground Power Ground 1 AUIPS71411G 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 Machine Model ESD Human Body Model Charged Device Model IC Latch-Up Test RoHS Compliant † †† SOIC-8L MSL2, 260°C (per IPC/JEDEC J-STD-020) Class M2 (200 V) (per AEC-Q100-003) Class H1C (1500 V) (per AEC-Q100-002) Class C5 (1000 V) (per AEC-Q100-011) ClassII, Level A (per AEC-Q100-004) Yes Qualification standards can be found at International Rectifier’s web site http://www.irf.com/ Exceptions to AEC-Q100 requirements are noted in the qualification report. www.irf.com 2 AUIPS71411G Absolute Maximum Ratings Absolute maximum ratings indicate sustained limits beyond which damage to the device may occur. All voltage parameters are referenced to the ground lead. (Tambient=25°C unless otherwise specified). Symbol Parameter Min. Vout Vcc-Vin max. Iifb, max. Vcc sc. Maximum output voltage Maximum Vcc voltage Maximum feedback current Maximum Vcc voltage with short circuit protection see page 6 Maximum power dissipation (internally limited by thermal protection) Rth=100°C/W Max. storage & operating junction temperature Vcc-60 Vcc+0.3 -16 65 -50 10 50 Pd Tj max. Max. Units V V mA V W -40 1.25 150 °C Typ. Max. Units 100 °C/W Thermal Characteristics Symbol Parameter Rth1 Thermal resistance junction to ambient SO8 Recommended Operating Conditions These values are given for a quick design. For operation outside these conditions, please consult the application notes. Symbol Parameter Iout Continuous output current, Tambient=85°C, Tj=125°C Rth=100°C/W Ifb resistor RIfb www.irf.com Min. Max. 1.5 1.5 Units A k 3 AUIPS71411G Static Electrical Characteristics Tj=25°C, Vcc=28V (unless otherwise specified) Symbol Parameter Min. Typ. Max. Operating voltage 6 60 ON state resistance Tj=25°C 75 100 ON state resistance Tj=150°C(2) 135 180 Icc off Supply leakage current 1 3 Iout off Output leakage current 1 3 I in on Input current while on 0.6 1.6 3 V clamp1 Vcc to Vout clamp voltage 1 60 64 V clamp2 Vcc to Vout clamp voltage 2 60 65 72 Vih(1) High level Input threshold voltage 3 4.5 Vil(1) Low level Input threshold voltage 1.5 2.3 Forward body diode voltage Tj=25°C 0.8 0.9 Forward body diode voltage Tj=125°C 0.65 0.75 (1) Input thresholds are measured directly between the input pin and the tab. Vcc op. Rds(on) Units Test Conditions V m µA mA V Ids=2A Vin=Vcc / Vifb=Vgnd Vout=Vgnd Vcc-Vin=28V Id=10mA Id=6A see fig. 2 Id=10mA If=1A Switching Electrical Characteristics Vcc=28V, Resistive load=27, Tj=25°C Symbol Parameter Tdon Tr Tdoff Tf Turn on delay time to 20% Rise time from 20% to 80% of Vcc Turn off delay time Fall time from 80% to 20% of Vcc Min. Typ. Max. 4 2 20 2.5 10 5 40 5 20 10 80 10 Units Test Conditions µs See fig. 1 µs Protection Characteristics Symbol Parameter Tsd Isd I fault Over temperature threshold Over-current shutdown Ifb after an over-current or an overtemperature (latched) Min. Typ. Max. Units 150(2) 5 2.7 165 7 3.3 10 4 °C A Min. Typ. Max. Units Test Conditions 2000 -5% -0.2 0 2400 0 0 8 2800 +5 0.2 100 % A µA Iload=2A Tj=-40°C to +150°C Iout<2A Iout=0A mA Test Conditions See fig. 3 and fig. 11 See fig. 3 and page 6 See fig. 3 Current Sensing Characteristics Symbol Parameter Ratio I load / Ifb current ratio Ratio_TC I load / Ifb variation over temperature(2) I offset Load current offset Ifb leakage Ifb leakage current (2) Guaranteed by design www.irf.com 4 AUIPS71411G Lead Assignments 8765 1234 1- IN 2- IFB 3- Out 4- Out 5-6-7-8 Vcc SO8 Functional Block Diagram All values are typical VCC Charge Pump 3V 75V 1.5mA 60V 75V + - Driver Reset Set 100 Iout > 7A Latch 75V Q Diag + Tj > 165°C IN www.irf.com IFB OUT 5 AUIPS71411G Truth Table Op. Conditions Normal mode Normal mode Open load Open load Short circuit to GND Short circuit to GND Over temperature Over temperature Input H L H L H L H L Output L H L H L L L L Ifb pin voltage 0V I load x Rfb / Ratio 0V 0V 0V V fault (latched) 0V V fault (latched) Operating voltage Maximum Vcc voltage : this is the maximum voltage before the breakdown of the IC process. Operating voltage : This is the Vcc range in which the functionality of the part is guaranteed. The Q100 qualification is run at the maximum operating voltage specified in the datasheet. Reverse battery During the reverse battery the Mosfet is kept off and the load current is flowing into the body diode of the power Mosfet. Power dissipation in the IPS : P = I load * Vf If the power dissipation is too high in Rifb, a diode in serial can be added to block the current. The transistor used to pull-down the input should be a bipolar in order to block the reverse current. The 100ohm input resistor can not sustain continuously 16V (see Vcc-Vin max. in the Absolute Maximum Ratings section) Active clamp The purpose of the active clamp is to limit the voltage across the MOSFET to a value below the body diode break down voltage to reduce the amount of stress on the device during switching. The temperature increase during active clamp can be estimated as follows: Tj PCL Z TH ( t CLAMP ) Where: Z TH ( t CLAMP ) is the thermal impedance at tCLAMP and can be read from the thermal impedance curves given in the data sheets. PCL VCL ICLavg : Power dissipation during active clamp VCL 65V : Typical VCLAMP value. ICLavg t CL di dt ICL : Average current during active clamp 2 ICL : Active clamp duration di dt VBattery VCL : Demagnetization current L Figure 9 gives the maximum inductance versus the load current in the worst case : the part switch off after an over temperature detection. If the load inductance exceed the curve, a free wheeling diode is required. Over-current protection The threshold of the over-current protection is set in order to guaranteed that the device is able to turn on a load with an inrush current lower than the minimum of Isd. Nevertheless for high current and high temperature the device may switch off for a lower current due to the over-temperature protection (see Figure 11). www.irf.com 6 AUIPS71411G Current sensing accuracy Ifb Ifb2 Ifb1 Ifb leakage I offset Iout1 Iout2 Iout The current sensing is specified by measuring 3 points : - Ifb1 for Iout1 - Ifb2 for Iout2 - Ifb leakage for Iout=0 Then the parameters of the datasheet are computed by the following formula : Ratio = ( Iout2 – Iout1 )/( Ifb2 – Ifb1) I offset = Ifb1 x Ratio – Iout1 This allows the designer to evaluate the Ifb for any Iout value using : Ifb = ( Iout + I offset ) / Ratio if Ifb > Ifb leakage For some applications, a calibration is required. In that case, the accuracy of the system will depends on the variation of the I offset and the ratio over the temperature range. The ratio variation is given by Ratio_TC specified in page 3. The Ioffset variation depends directly of the Rdson : I offset@-40°C= I offset@25°C / 0.8 I offset@150°C= I offset@25°C / 1.9 Maximum Vcc voltage with short circuit protection The maximum Vcc voltage with short circuit is the maximum voltage for which the part is able to protect itself under test conditions representative of the application. 2 kind of short circuits are considered : terminal and load short circuit. L supply 5µH R supply 10mohm Vcc IPS Out Terminal SC Load SC L SC 0.1 µH 10 µH R SC 10 mohm 100 mohm L SC R SC www.irf.com 7 AUIPS71411G T clamp Vcc-Vin 80% Vcc-Vin 20% Ids 80% Vcc Vout 20% Td on Td off Vds Vds clamp Tf Tr See Application Notes to evaluate power dissipation Figure 2 – Active clamp waveforms Figure 1 – IN rise time & switching definitions Vin I shutdown Ids Tj Tshutdown Tsd 165°C V fault Vifb Icc off, supply leakage current (µA) 10 8 6 4 2 0 -50 0 50 100 150 Tj, junction temperature (°C) Figure 3 – Protection timing diagram www.irf.com Figure 4 – Icc off (µA) Vs Tj (°C) 8 20 4 15 3 Vih and Vil (V) Icc, supply current (mA) AUIPS71411G 10 5 2 VIH 1 VIL 0 0 0 10 20 30 40 -50 50 -25 Vcc-Vin, supply voltage (V) 25 50 75 100 125 150 Tj, junction temperature (°C) Figure 5 – Icc (mA) Vs Vcc-Vin (V) Figure 6 – Vih and Vil (V) Vs Tj (°C) 200% 100.00 Zth, transient thermal impedance (°C/W) Rds(on), Drain-to-Source On Resistance (Normalized) 0 10.00 150% 100% 50% -50 0 50 100 Tj, junction temperature (°C) Figure 7 - Normalized Rds(on) (%) Vs Tj (°C) www.irf.com 150 1.00 0.10 0.01 1.E05 1.E04 1.E03 1.E02 1.E- 1.E+0 1.E+0 1.E+0 01 0 1 2 Time (s) Figure 8 – Transient thermal impedance (°C/W) Vs time (s) 9 AUIPS71411G 1.4 Ifb, current feedback current (mA) Max. output current (A) 100 10 1 1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 Inductance (µH) Figure 9 – Max. Iout (A) Vs inductance (µH) www.irf.com 1.2 25°C 1.0 0.8 150°C 0.6 0.4 0.2 0.0 0 1 2 4 3 Iout, output current (A) Figure 10 – Ifb (mA) Vs Iout (A) 10 AUIPS71411G Case Outline - SO-8 www.irf.com 11 AUIPS71411G Tape & Reel - SO-8 www.irf.com 12 AUIPS71411G Part Marking Information Ordering Information Base Part Number Standard Pack Package Type Complete Part Number Form AUIPS71411G SO8 Tube Tape and reel www.irf.com Quantity 95 AUIPS71411G 2500 AUIPS71411GTR 13 AUIPS71411G 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 and / or customer specific requirements with regards to product discontinuance and process change notification. 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