Smart High-Side Power Switch Smart High-Side Power Switch PROFET BTS712N1 Data Sheet Rev 1.3, 2010-03-16 Automotive Power http://store.iiic.cc/ Smart High-Side Power Switch BTS712N1 Smart Four Channel Highside Power Switch Features * Overload protection * Current limitation * Short-circuit protection * Thermal shutdown * Overvoltage protection (including load dump) * Fast demagnetization of inductive loads * Reverse battery protection1) * Undervoltage and overvoltage shutdown with auto-restart and hysteresis * Open drain diagnostic output * Open load detection in OFF-state * CMOS compatible input * Loss of ground and loss of Vbb protection * Electrostatic discharge (ESD) protection Product Summary Overvoltage Protection Operating voltage active channels: On-state resistance RON Nominal load current ,/ 120 Current limitation ,/ 6&U Vbb(AZ) 43 V Vbb(on) 5.0 ... 34 V two parallel four parallel one 200 100 50 m 1.9 2.8 4.4 A 4 4 4 A PG-DSO20 P-DSO-20 Application * C compatible power switch with diagnostic feedback for 12 V and 24 V DC grounded loads * All types of resistive, inductive and capacitive loads * Replaces electromechanical relays and discrete circuits General Description N channel vertical power FET with charge pump, ground referenced CMOS compatible input and diagnostic feedback, monolithically integrated in Smart SIPMOS technology. Providing embedded protective functions. Pin Definitions and Functions Pin 1,10, 11,12, 15,16, 19,20 3 5 7 9 18 17 14 13 4 8 2 6 1) Pin configuration (top view) Symbol Function Vbb Positive power supply voltage. Design the wiring for the simultaneous max. short circuit currents from channel 1 to 4 and also for low thermal resistance IN1 Input 1 .. 4, activates channel 1 .. 4 in case of IN2 logic high signal IN3 IN4 OUT1 Output 1 .. 4, protected high-side power output OUT2 of channel 1 .. 4. Design the wiring for the OUT3 max. short circuit current OUT4 ST1/2 Diagnostic feedback 1/2 of channel 1 and channel 2, open drain, low on failure ST3/4 Diagnostic feedback 3/4 of channel 3 and channel 4, open drain, low on failure GND1/2 Ground 1/2 of chip 1 (channel 1 and channel 2) GND3/4 Ground 3/4 of chip 2 (channel 3 and channel 4) Vbb GND1/2 IN1 ST1/2 IN2 GND3/4 IN3 ST3/4 IN4 Vbb 1 2 3 4 5 6 7 8 9 10 * 20 19 18 17 16 15 14 13 12 11 Vbb Vbb OUT1 OUT2 Vbb Vbb OUT3 OUT4 Vbb Vbb With external current limit (e.g. resistor RGND=150 ) in GND connection, resistor in series with ST connection, reverse load current limited by connected load. Data Sheet 2 http://store.iiic.cc/ Rev 1.3, 2010-03-16 Smart High-Side Power Switch BTS712N1 Block diagram Four Channels; Open Load detection in off state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ata Sheet 3 http://store.iiic.cc/ Rev 1.3, 2010-03-16 Smart High-Side Power Switch BTS712N1 Maximum Ratings at Tj = 25C unless otherwise specified Parameter Symbol Supply voltage (overvoltage protection see page 4) Supply voltage for full short circuit protection Tj,start = -40 ...+150C Load current (Short-circuit current, see page 5) Load dump protection2) VLoadDump = UA + Vs, UA = 13.5 V RI3) = 2 , td = 200 ms; IN = low or high, each channel loaded with RL = 7.1 , Operating temperature range Storage temperature range Power dissipation (DC)5 Ta = 25C: Ta = 85C: (all channels active) Inductive load switch-off energy dissipation, single pulse Vbb = 12V, Tj,start = 150C5), IL = 1.9 A, ZL = 66 mH, 0 one channel: IL = 2.8 A, ZL = 66 mH, 0 two parallel channels: IL = 4.4 A, ZL = 66 mH, 0 four parallel channels: Vbb Vbb Values Unit 43 34 V V IL VLoad self-limited 60 A V Tj Tstg Ptot -40 ...+150 -55 ...+150 3.6 1.9 C EAS 150 320 800 mJ VESD 1.0 kV -10 ... +16 2.0 5.0 V mA 16 44 35 K/W 4) dump W see diagrams on page 9 Electrostatic discharge capability (ESD) (Human Body Model) Input voltage (DC) Current through input pin (DC) Current through status pin (DC) VIN IIN IST see internal circuit diagram page 8 Thermal resistance junction - soldering point5),6) junction - ambient5) 2) 3) 4) 5) each channel: one channel active: all channels active: Rthjs Rthja Supply voltages higher than Vbb(AZ) require an external current limit for the GND and status pins, e.g. with a 150 resistor in the GND connection and a 15 k resistor in series with the status pin. A resistor for input protection is integrated. RI = internal resistance of the load dump test pulse generator VLoad dump is setup without the DUT connected to the generator per ISO 7637-1 and DIN 40839 Device on 50mm*50mm*1.5mm epoxy PCB FR4 with 6cm2 (one layer, 70m thick) copper area for Vbb connection. PCB is vertical without blown air. See page 14 Data Sheet 4 http://store.iiic.cc/ Rev 1.3, 2010-03-16 Smart High-Side Power Switch BTS712N1 Electrical Characteristics Parameter and Conditions, each of the four channels Symbol at Tj = 25 C, Vbb = 12 V unless otherwise specified Load Switching Capabilities and Characteristics On-state resistance (Vbb to OUT) each channel, Tj = 25C: RON IL = 1.8 A Tj = 150C: two parallel channels, Tj = 25C: four parallel channels, Tj = 25C: Nominal load current one channel active: two parallel channels active: four parallel channels active: 5) Device on PCB , Ta = 85C, Tj 150C Output current while GND disconnected or pulled up; Vbb = 30 V, VIN = 0, see diagram page 9 Turn-on time to 90% VOUT: Turn-off time to 10% VOUT: RL = 12 , Tj =-40...+150C Slew rate on 10 to 30% VOUT, RL = 12 , Tj =-40...+150C: Slew rate off 70 to 40% VOUT, RL = 12 , Tj =-40...+150C: Operating Parameters Operating voltage7) Undervoltage shutdown Undervoltage restart Tj =-40...+150C: Tj =-40...+150C: Tj =-40...+25C: Tj =+150C: Undervoltage restart of charge pump see diagram page 14 Tj =-40...+150C: Undervoltage hysteresis Vbb(under) = Vbb(u rst) - Vbb(under) Overvoltage shutdown Tj =-40...+150C: Overvoltage restart Tj =-40...+150C: Overvoltage hysteresis Tj =-40...+150C: Overvoltage protection8) Tj =-40...+150C: I bb = 40 mA 7) 8) Values min typ max -- Unit m 165 320 200 400 1.7 2.6 4.1 83 42 1.9 2.8 4.4 100 50 -- A -- -- 10 mA ton toff 80 80 200 200 400 400 s dV/dton 0.1 -- 1 V/s -dV/dtoff 0.1 -- 1 V/s Vbb(on) Vbb(under) Vbb(u rst) 5.0 3.5 -- ---- V V V Vbb(ucp) -- 5.6 34 5.0 5.0 7.0 7.0 Vbb(under) -- 0.2 -- V Vbb(over) Vbb(o rst) Vbb(over) Vbb(AZ) 34 33 -42 --0.5 47 43 ---- V V V V IL(NOM) IL(GNDhigh) V At supply voltage increase up to Vbb = 5.6 V typ without charge pump, VOUT Vbb - 2 V see also VON(CL) in circuit diagram on page 8. Data Sheet 5 http://store.iiic.cc/ Rev 1.3, 2010-03-16 Smart High-Side Power Switch BTS712N1 Parameter and Conditions, each of the four channels Symbol at Tj = 25 C, Vbb = 12 V unless otherwise specified Standby current, all channels off Tj =25C: Ibb(off) VIN = 0 Tj =150C: 9) Operating current , VIN = 5V, Tj =-40...+150C IGND = IGND1/2 + IGND3/4, one channel on: IGND four channels on: Values min typ max Unit --- 180 160 300 300 A --- 0.35 1.2 0.8 2.8 mA Protection Functions10) Initial peak short circuit current limit, (see timing diagrams, page 12) each channel, Tj =-40C: IL(SCp) 5.5 9.5 13 4.5 7.5 11 Tj =25C: 2.5 4.5 7 Tj =+150C: two parallel channels twice the current of one channel four parallel channels four times the current of one channel Repetitive short circuit current limit, Tj = Tjt each channel IL(SCr) -4 --4 -two parallel channels -4 -four parallel channels A A (see timing diagrams, page 12) Initial short circuit shutdown time Tj,start =-40C: toff(SC) Tj,start = 25C: --- 48 29 --- ms -- 47 -- V 150 -- -10 --- C K --- -610 32 -- V mV -2 30 3 -4 A V (see page 10 and timing diagrams on page 12) VON(CL) Output clamp (inductive load switch off)11) at VON(CL) = Vbb - VOUT Thermal overload trip temperature Thermal hysteresis Tjt Tjt Reverse Battery Reverse battery voltage 12) Drain-source diode voltage (Vout > Vbb) IL = - 1.9 A, Tj = +150C Diagnostic Characteristics Open load detection current Open load detection voltage -Vbb -VON IL(off) Tj =-40..+150C: VOUT(OL) 9) Add IST, if IST > 0 Integrated protection functions are designed to prevent IC destruction under fault conditions described in the data sheet. Fault conditions are considered as "outside" normal operating range. Protection functions are not designed for continuous repetitive operation. 11) If channels are connected in parallel, output clamp is usually accomplished by the channel with the lowest VON(CL) 12) Requires a 150 resistor in GND connection. The reverse load current through the intrinsic drain-source diode has to be limited by the connected load. Note that the power dissipation is higher compared to normal operating conditions due to the voltage drop across the intrinsic drain-source diode. The temperature protection is not active during reverse current operation! Input and Status currents have to be limited (see max. ratings page 3 and circuit page 8). 10) Data Sheet 6 http://store.iiic.cc/ Rev 1.3, 2010-03-16 Smart High-Side Power Switch BTS712N1 Parameter and Conditions, each of the four channels Symbol Values min typ max RI 2.5 3.5 6 k VIN(T+) 1.7 -- 3.5 V VIN(T-) 1.5 -- -- V VIN(T) VIN = 0.4 V: IIN(off) -1 0.5 -- -50 V A VIN = 5 V: IIN(on) 20 50 90 A td(ST OL3) -- 220 -- s Status output (open drain) Zener limit voltage Tj =-40...+150C, IST = +1.6 mA: VST(high) Tj =-40...+25C, IST = +1.6 mA: VST(low) ST low voltage Tj = +150C, IST = +1.6 mA: 5.4 --- 6.1 --- -0.4 0.6 V at Tj = 25 C, Vbb = 12 V unless otherwise specified Input and Status Feedback13) Input resistance (see circuit page 8) Tj =-40..+150C: Input turn-on threshold voltage Tj =-40..+150C: Input turn-off threshold voltage Tj =-40..+150C: Input threshold hysteresis Off state input current Tj =-40..+150C: On state input current Tj =-40..+150C: Delay time for status with open load Unit (see timing diagrams, page 12) 13) If ground resistors RGND are used, add the voltage drop across these resistors. Data Sheet 7 http://store.iiic.cc/ Rev 1.3, 2010-03-16 Smart High-Side Power Switch BTS712N1 Truth Table Channel 1 and 2 Channel 3 and 4 (equivalent to channel 1 and 2) Chip 1 Chip 2 Normal operation Open load Channel 1 (3) Channel 2 (4) Short circuit to Vbb Channel 1 (3) Channel 2 (4) Overtemperature both channel Channel 1 (3) Channel 2 (4) Undervoltage/ Overvoltage L = "Low" Level H = "High" Level IN1 IN3 IN2 IN4 OUT1 OUT3 OUT2 OUT4 L L H H L L H L H L H L H X L L H H Z Z H L H L H L H X L H X L L H L L H L H X L H X H H H Z Z H L H X L H X L X H L H X X X L L H L H X X X L H X L H X L L L L L X X L H H H L L L X X L L L ST1/2 ST3/4 ST1/2 ST3/4 BTS 711L1 BTS 712N1 H H H H H H H H L H H H(L14)) H L H(L14)) H L L H H L15) H H L15) H H(L16)) L15) H H(L16)) H L L H L H L H L15) H H H L L H L H L H X = don't care Z = high impedance, potential depends on external circuit Status signal valid after the time delay shown in the timing diagrams Parallel switching of channel 1 and 2 (also channel 3 and 4) is easily possible by connecting the inputs and outputs in parallel (see truth table). If switching channel 1 to 4 in parallel, the status outputs ST1/2 and ST3/4 have to be configured as a 'Wired OR' function with a single pull-up resistor. Terms 9 ,EE EE 9 21 9 21 /HDGIUDPH , ,1 , ,1 , 67 9 ,1 9,1 967 9EE ,1 ,1 287 352)(7 &KLS 287 67 *1' 5 , / , / 9 287 , *1' 9 21 9 21 /HDGIUDPH , ,1 , ,1 , 67 9 ,1 9,1 967 9287 ,1 287 352)(7 &KLS 287 67 *1' 5 *1' 9EE ,1 , / , / 9 287 , *1' 9287 *1' Leadframe (Vbb) is connected to pin 1,10,11,12,15,16,19,20 External RGND optional; two resistors RGND1/2 ,RGND3/4 = 150 or a single resistor RGND = 75 for reverse battery protection up to the max. operating voltage. 14) With additional external pull up resistor An external short of output to Vbb in the off state causes an internal current from output to ground. If RGND is used, an offset voltage at the GND and ST pins will occur and the VST low signal may be errorious. 16) Low resistance to V may be detected by no-load-detection bb 15) Data Sheet 8 http://store.iiic.cc/ Rev 1.3, 2010-03-16 Smart High-Side Power Switch BTS712N1 Overvoltage protection of logic part Input circuit (ESD protection), IN1...4 GND1/2 or GND3/4 ,1 5 9 EE , (6'=' , , , = ,1 /RJLF *1' 67 5 67 9 ESD zener diodes are not to be used as voltage clamp at DC conditions. Operation in this mode may result in a drift of the zener voltage (increase of up to 1 V). = *1' 5 *1' 6LJQDO*1' Status output, ST1/2 or ST3/4 VZ1 = 6.1 V typ., VZ2 = 47 V typ., RI = 3.5 k typ., RGND = 150 9 5 67 21 9 5, ,1 67 Reverse battery protection 9 *1' (6' =' 5 67 ,1 ESD-Zener diode: 6.1 V typ., max 5.0 mA; RST(ON) < 380 at 1.6 mA, ESD zener diodes are not to be used as voltage clamp at DC conditions. Operation in this mode may result in a drift of the zener voltage (increase of up to 1 V). 9EE 5, /RJLF 67 287 3RZHU ,QYHUVH 'LRGH *1' 5/ 5*1' Inductive and overvoltage output clamp, OUT1...4 3RZHU*1' 6LJQDO*1' RGND = 150 , RI = 3.5 k typ, 9EE Temperature protection is not active during inverse current operation. 9= 9 21 Open-load detection, OUT1...4 287 OFF-state diagnostic condition: VOUT > 3 V typ.; IN low 352)(7 3RZHU*1' VON clamped to VON(CL) = 47 V typ. 2)) , /RJLF XQLW / 2/ 9 287 2SHQORDG GHWHFWLRQ 6LJQDO*1' Data Sheet 9 http://store.iiic.cc/ Rev 1.3, 2010-03-16 Smart High-Side Power Switch BTS712N1 Inductive load switch-off energy dissipation GND disconnect (channel 1/2 or 3/4) ( EE 9 ( $6 ,EE EE ,1 9EE ,1 352)(7 287 352)(7 287 67 9 287 / 67 *1' 9 9 ,1 ,1 67 (/RDG 9EE ,1 *1' =/ 9 *1' ^ 5 (/ (5 / Any kind of load. In case of IN = high is VOUT VIN - VIN(T+). Due to VGND > 0, no VST = low signal available. Energy stored in load inductance: GND disconnect with GND pull up While demagnetizing load inductance, the energy dissipated in PROFET is (channel 1/2 or 3/4) 2 EL = 1/2*L*I L EAS= Ebb + EL - ER= VON(CL)*iL(t) dt, 9 ,1 9 9 ,1 9 EE with an approximate solution for RL > 0 : ,1 9EE ,1 352)(7 287 EAS= 287 67 IL* L (V + |VOUT(CL)|) 2*RL bb OQ(1+ |V IL*RL OUT(CL)| ) *1' 9 67 Maximum allowable load inductance for a single switch off (one channel)5) / I ,/ Tj,start = 150C, Vbb = 12 V, RL = 0 *1' Any kind of load. If VGND > VIN - VIN(T+) device stays off Due to VGND > 0, no VST = low signal available. L [mH] Vbb disconnect with energized inductive load ,1 9EE ,1 352)(7 67 *1' KLJK 287 287 9 EE For an inductive load current up to the limit defined by EAS (max. ratings see page 3 and diagram on page 9) each switch is protected against loss of Vbb. Consider at your PCB layout that in the case of Vbb disconnection with energized inductive load the whole load current flows through the GND connection. Data Sheet IL [A] 10 http://store.iiic.cc/ Rev 1.3, 2010-03-16 Smart High-Side Power Switch BTS712N1 Typ. ground pin operating current Typ. on-state resistance VIN = high (one channel on) ; IL = 1.8 A, IN = high IGND [mA] RON [mOhm] Vbb [V] Vbb [V] Typ. initial short circuit shutdown time Typ. standby current ; Vbb =12 V ; Vbb = 9...34 V, IN1...4 = low Ibb(off) [A] t off(S C ) [ms ec ] 60 50 40 30 20 10 0 40 Tj [C] Ibb(off) includes four times the current IL(off) of the open load detection current sources. Data Sheet 11 http://store.iiic.cc/ -25 0 25 50 75 100 125 150 T j, s tart [C] Rev 1.3, 2010-03-16 Smart High-Side Power Switch BTS712N1 Timing diagrams Timing diagrams are shown for chip 1 (channel 1/2). For chip 2 (channel 3/4) the diagrams are valid too. The channels 1 and 2, respectively 3 and 4, are symmetric and consequently the diagrams are valid for each channel as well as for permuted channels Figure 1a: Vbb turn on: Figure 2b: Switching an inductive load, ,1 ,1 ,1 9 EE 67 9 287 9 287 9 287 , L 67RSHQGUDLQ W W Figure 3a: Turn on into short circuit: shut down by overtemperature, restart by cooling Figure 2a: Switching a lamp: ,1 ,1 67 , RWKHUFKDQQHOQRUPDORSHUDWLRQ / , 9 / 6&S 287 , , W / 67 Data Sheet RII 6& W W The initial peak current should be limited by the lamp and not by the initial short circuit current IL(SCp) = 7.5 A typ. of the device. / 6&U Heating up of the chip may require several milliseconds, depending on external conditions (toff(SC) vs. Tj,start see page 11) 12 http://store.iiic.cc/ Rev 1.3, 2010-03-16 Smart High-Side Power Switch BTS712N1 Figure 5a: Open load: detection in OFF-state, turn on/off to open load Figure 3b: Turn on into short circuit: shut down by overtemperature, restart by cooling (two parallel switched channels 1 and 2) ,1 ,1 ,1FKDQQHOQRUPDORSHUDWLRQ ,, // , / 6&S 9287 , / 6&U , / FKDQQHORSHQORDG W 67 RII 6& W 67 G 672/ W d(ST OL3) W W td(ST,OL3) depends on external circuitry because of high impedance *) IL = 30 A typ Figure 4a: Overtemperature: Reset if Tj <Tjt Figure 6a: Undervoltage: ,1 ,1 67 9 EE V bb(under) 9 Vbb(u cp) 9bb(u rst) 287 9 287 7 - 67RSHQGUDLQ W W Data Sheet 13 http://store.iiic.cc/ Rev 1.3, 2010-03-16 Smart High-Side Power Switch BTS712N1 Figure 6b: Undervoltage restart of charge pump RIIVWDWH RQVWDWH 9 9 EE XUVW 9 9 9 EE RYHU RIIVWDWH 921 &/ 9 RQ EE RUVW EE XFS EE XQGHU 9 EE IN = high, normal load conditions. Charge pump starts at Vbb(ucp) = 5.6 V typ. Figure 7a: Overvoltage: ,1 9bb V ON(CL) Vbb(over) V bb(o rst) 9 287 67 W Data Sheet 14 http://store.iiic.cc/ Rev 1.3, 2010-03-16 Smart High-Side Power Switch BTS712N1 1.27 0.35 8 ma x 7.6 -0.2 1) +0.09 0.35 x 45 0.23 2.65 max 2.45 -0.2 0.2 -0.1 Package Outlines 0.4 +0.8 +0.15 2) 0.2 24x 20 0.1 10.3 0.3 11 GPS05094 1 12.8 1) 10 -0.2 Index Marking 1) Does not include plastic or metal protrusions of 0.15 max per side 2) Does not include dambar protrusion of 0.05 max per side Figure 1 PG-DSO-20 (Plastic Dual Small Outline Package) (RoHS-compliant) Green Product (RoHS compliant) To meet the world-wide customer requirements for environmentally friendly products and to be compliant with government regulations the device is available as a green product. Green products are RoHS-Compliant (i.e Pbfree finish on leads and suitable for Pb-free soldering according to IPC/JEDEC J-STD-020). Please specify the package needed (e.g. green package) when placing an order You can find all of our packages, sorts of packing and others in our Infineon Internet Page "Products": http://www.infineon.com/products. Data Sheet 15 http://store.iiic.cc/ Dimensions in mm Rev 1.3, 2010-03-16 Smart High-Side Power Switch BTS712N1 Revision History Version Date Changes Rev 1.3 2010-03-16 page 6: changed reference to the timing diagram Rev 1.2 2009-07-13 page 1: added new coverpage page 6: Initial short circuit shutdown time changed: toff(SC) -40 C to 48 ms toff(SC) 25 C to 29 ms page 11: changed graphic V1.1 2007-08-30 Creation of the green datasheet. First page : Adding the green logo and the AEC qualified Adding the bullet AEC qualified and the RoHS compliant features Package page Modification of the package to be green. Data Sheet 16 http://store.iiic.cc/ Rev 1.3, 2010-03-16 Edition 2010-03-16 Published by Infineon Technologies AG 81726 Munich, Germany (c) Infineon Technologies AG 3/16/10. All Rights Reserved. Legal Disclaimer 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 or hints given herein, any typical values stated herein and/or any information regarding the application of the device, 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. Information For further information on technology, delivery terms and conditions and prices please contact your nearest Infineon Technologies Office (www.infineon.com). Warnings Due to technical requirements components may contain dangerous substances. For information on the types in question please contact your nearest Infineon Technologies Office. Infineon Technologies Components may only be used in life-support devices or systems with the express written approval of Infineon Technologies, if a failure of such components can reasonably be expected to cause the failure of that life-support device or system, or to affect the safety or effectiveness of that device or system. Life support devices or systems are intended to be implanted in the human body, or to support and/or maintain and sustain and/or protect human life. If they fail, it is reasonable to assume that the health of the user or other persons may be endangered. http://store.iiic.cc/