LT4356-3 Surge Stopper with Fault Latchoff - …

1 LT4356-3143563fcFor more information Stopper with Fault LatchoffThe LT 4356-3 Surge Stopper protects loads from high voltage transients. It regulates the output during an overvoltage event, such as load dump in automobiles, by controlling the gate of an external N-channel MOSFET. The output is limited to a safe value thereby allowing the loads to continue functioning. The LT4356-3 also monitors the voltage drop between the VCC and SNS pins to protect against overcurrent faults. An internal amplifier limits the current sense voltage to 50mV. In either Fault condi-tion, a timer is started inversely proportional to MOSFET stress. If the timer expires, the FLT pin pulls low to warn of an impending power down. If the condition persists, the MOSFET is turned off, until the SHDN pin pulls low auxiliary amplifier may be used as a voltage detection comparator or as a linear regulator controller driving an external PNP pass FETs can be used in lieu of a Schottky diode for reverse input protection, reducing voltage drop and power loss.

2 The SHDN input turns off the part, including the auxiliary amplifier, and reduces the quiescent current to less than 7 Automotive/Avionic Surge Protectionn Hot Swap/Live Insertionn High Side Switch for Battery Powered Systemsn Intrinsic Safety Applicationsn Stops High Voltage Surgesn Adjustable Output Clamp Voltagen Overcurrent Protectionn Wide Operation Range: 4V to 80Vn Reverse Input Protection to 60Vn Low 7 A Shutdown Currentn Adjustable Latchoff Fault Timern Controls N-channel MOSFETn Shutdown Pin Withstands 60V to 100Vn Fault Output Indicationn Auxiliary Amplifier for Level Detection Comparator or Linear Regulator Controllern Available in (4mm 3mm) 12-Pin DFN, 10-Pin MSOP or 16-Pin SO Packages4A, 12V Overvoltage Output RegulatorOvervoltage Protector Regulates Output at 27V During F10 10m IRLR2908 VIN12V43563 TA01LT4356DE-3 GNDTMROUTGATESNSIN+ INPUT SURGECTMR = FILOAD = 500mA27V ADJUSTABLE CLAMP12V12 VtypicAl ApplicAtionL, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and No RSENSE and ThinSOT are trademarks of Analog Devices, Inc.

3 All other trademarks are the property of their respective more information #orderinfoVCC, SHDN .. 60V to 100 VSNS ..VCC 30V or 60V to VCC + , AOUT, F LT, EN .. to 80 VGATE (Note 3) .. to VOUT + 10 VFB, TMR, IN+ .. to 6 VAOUT, EN, F LT, IN+ .. 3mAOperating Temperature Range LT4356C-3 ..0 C to 70 C LT4356I-3 .. 40 C to 85 C12111098713123456IN+AOUTGNDENFLTSHDNTMR FBOUTGATESNSVCCTOP VIEWDE PACKAGE12-LEAD (4mm 3mm) PLASTIC DFN TJMAX = 125 C, JA = 43 C/W EXPOSED PAD (PIN 13) PCB GND CONNECTION OPTIONAL12345 FBOUTGATESNSVCC109876 TMRGNDENFLTSHDNTOP VIEWMS PACKAGE10-LEAD PLASTIC MSOP TJMAX = 125 C, JA = 160 C/WTOP VIEWS PACKAGE16-LEAD PLASTIC SO12345678161514131211109 TMRFBNCOUTGATENCSNSVCCIN+NCAOUTNCGNDENFL TSHDN TJMAX = 150 C, JA = 100 C/W LT4356H-3 .. 40 C to 125 C LT4356MP-3 .. 55 C to 125 CStorage Temperature Range DE12 .. 65 C to 125 C MS, SO .. 65 C to 150 CLead Temperature (Soldering, 10 sec) MS, SO ..300 CAbsolute mAximum rAtingspin conFigurAtion(Notes 1 and 2)LEAD FREE FINISHTAPE AND REELPART MARKING*PACKAGE DESCRIPTIONTEMPERATURE RANGELT4356 CDE-3#PBFLT4356 CDE-3#TRPBF4356312-Lead (4mm 3mm) Plastic DFN0 C to 70 CLT4356 IDE-3#PBFLT4356 IDE-3#TRPBF4356312-Lead (4mm 3mm) Plastic DFN 40 C to 85 CLT4356 HDE-3#PBFLT4356 HDE-3#TRPBF4356312-Lead (4mm 3mm)

4 Plastic DFN 40 C to 125 CLT4356 CMS-3#PBFLT4356 CMS-3#TRPBFLTFFK10-Lead Plastic MSOP0 C to 70 CLT4356 IMS-3#PBFLT4356 IMS-3#TRPBFLTFFK10-Lead Plastic MSOP 40 C to 85 CLT4356 HMS-3#PBFLT4356 HMS-3#TRPBFLTFFK10-Lead Plastic MSOP 40 C to 125 CLT4356 MPMS-3#PBFLT4356 MPMS-3#TRPBFLTGGZ10-Lead Plastic MSOP 55 C to 125 CLT4356CS-3#PBFLT4356CS-3#TRPBFLT4356S-3 16-Lead Plastic SO0 C to 70 CLT4356IS-3#PBFLT4356IS-3#TRPBFLT4356S-3 16-Lead Plastic SO 40 C to 85 CLT4356HS-3#PBFLT4356HS-3#TRPBFLT4356S-3 16-Lead Plastic SO 40 C to 125 CLT4356 MPS-3#PBFLT4356 MPS-3#TRPBFLT4356 MPS-316-Lead Plastic SO 55 C to 125 CLEAD BASED FINISHTAPE AND REELPART MARKING*PACKAGE DESCRIPTIONTEMPERATURE RANGELT4356 CDE-3LT4356 CDE-3#TR4356312-Lead (4mm 3mm) Plastic DFN0 C to 70 CLT4356 IDE-3LT4356 IDE-3#TR4356312-Lead (4mm 3mm) Plastic DFN 40 C to 85 CLT4356 HDE-3LT4356 HDE-3#TR4356312-Lead (4mm 3mm) Plastic DFN 40 C to 125 CLT4356-3343563fcFor more information The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25 C.

5 VCC = 12V unless otherwise chArActeristicsSYMBOLPARAMETERCONDITIONS MINTYPMAXUNITSVCCO perating Voltage Rangel480 VICCVCC Supply CurrentVSHDN = = 0V, IN+ = LT4356C, LT4356I LT4356H, LT4356MP l l7 7 725 30 40 A A AIRR everse Input CurrentVSNS = VCC = 30V, SHDN Open VSNS = VCC = VSHDN = 30Vl 2mA mA VGATEGATE Pin Output High VoltageVCC = 4V; (VGATE VOUT) 80V VCC 8V; (VGATE VOUT)l 108 16V VIGATE(UP)GATE Pin Pull-Up CurrentVGATE = 12V; VCC = 12V; LT4356C, LT4356I, LT4356H VGATE = 12V; VCC = 12V; LT4356MP VGATE = 48V; VCC = 48Vl l l 4 4 23 23 30 36 38 50 A A AIGATE(DN)GATE Pin Pull-Down CurrentOvervoltage, VFB = , VGATE = 12V Overcurrent, VCC VSNS = 120mV, VGATE = 12V Shutdown Mode, VSHDN = 0V, VGATE = 12Vl l l75 4 10 5mA mA mAVFBFB Pin Servo VoltageVGATE = 12V, VOUT = 12V; LT4356C, LT4356I VGATE = 12V, VOUT = 12V; LT4356H, LT4356 MPl VIFBFB Pin Input CurrentVFB = A VSNSO vercurrent Fault Threshold VSNS = (VCC VSNS), VCC = 12V; LT4356C, LT4356I VSNS = (VCC VSNS), VCC = 12V; LT4356H VSNS = (VCC VSNS), VCC = 12V; LT4356MP VSNS = (VCC VSNS), VCC = 48V; LT4356C, LT4356I VSNS = (VCC VSNS), VCC = 48V; LT4356H VSNS = (VCC VSNS), VCC = 48V.

6 LT4356 MPl l l l l l45 46 43 4350 50 50 51 51 5155 55 56 56 56 57mV mV mV mV mV mVISNSSNS Pin Input CurrentVSNS = VCC = 12V to 48Vl51022 AILEAKF LT, EN Pins Leakage Current AOUT Pin Leakage CurrentF LT, EN = 80V AOUT = A AITMRTMR Pin Pull-up CurrentVTMR = 1V, VFB = , (VCC VOUT) = VTMR = 1V, VFB = , (VCC VOUT) = 75V VTMR = , VFB = , (VCC VOUT) = 75V VTMR = 1V, VSNS = 60mV, (VCC VOUT) = VTMR = 1V, VSNS = 60mV, (VCC VOUT) = 80Vl l l l l 44 195 50 260 4 56 325 A A A A ATMR Pin Pull-down CurrentVTMR = 1V, VFB = 1V, VSNS = AVTMRTMR Pin ThresholdsFLT From High to Low, VCC = 5V to BASED FINISHTAPE AND REELPART MARKING*PACKAGE DESCRIPTIONTEMPERATURE RANGELT4356 CMS-3LT4356 CMS-3#TRLTFFK10-Lead Plastic MSOP0 C to 70 CLT4356 IMS-3LT4356 IMS-3#TRLTFFK10-Lead Plastic MSOP 40 C to 85 CLT4356 HMS-3LT4356 HMS-3#TRLTFFK10-Lead Plastic MSOP 40 C to 125 CLT4356 MPMS-3LT4356 MPMS-3#TRLTGGZ10-Lead Plastic MSOP 55 C to 125 CLT4356CS-3LT4356CS-3#TRLT4356S-316-Lead Plastic SO0 C to 70 CLT4356IS-3LT4356IS-3#TRLT4356S-316-Lead Plastic SO 40 C to 85 CLT4356HS-3LT4356HS-3#TRLT4356S-316-Lead Plastic SO 40 C to 125 CLT4356 MPS-3LT4356 MPS-3#TRLT4356 MPS-316-Lead Plastic SO 55 C to 125 CConsult LTC Marketing for parts specified with wider operating temperature ranges.

7 *The temperature grade is identified by a label on the shipping more information on lead free part marking, go to: For more information on tape and reel specifications, go to: Some packages are available in 500 unit reels through designated sales channels with #TRMPBF inFormAtionLT4356-3443563fcFor more information The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25 C. VCC = 12V unless otherwise 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and 2: All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to GND unless otherwise 3: An internal clamp limits the GATE pin to a minimum of 10V above the OUT pin.

8 Driving this pin to voltages beyond the clamp may damage the chArActeristicsSYMBOLPARAMETERCONDITIONS MINTYPMAXUNITS VTMRE arly Warning PeriodFrom F LT going Low to GATE going Low, VCC = 5V to 80Vl80100120mVVIN+IN+ Pin +IN+ Pin Input CurrentVIN+ = AVOLF LT, EN, AOUT Pins Output LowISINK = 2mA ISINK = l2 3008 800V mVIOUTOUT Pin Input CurrentVOUT = VCC = 12V; LT4356C, LT4356I, LT4356H VOUT = VCC = 12V; LT4356MP VOUT = VCC = 12V, VSHDN = 0Vl l l200 200 6300 310 14 A A mA VOUTOUT Pin High Threshold VOUT = VCC VOUT; EN From Low to Pin ThresholdVCC = 12V to 48V VVSHDN(FLT)SHDN Pin Float VoltageVCC = 12V to Pin CurrentVSHDN = 0Vl 1 4 8 AtOFF(OC)Overcurrent Turn Off Delay TimeGATE From High to Low, VSNS = 0 120mV; LT4356C, LT4356I, LT4356H LT4356MP l l 2 2 4 s stOFF(OV)Overvoltage Turn Off Delay TimeGATE From High to Low, VFB = 0 stypicAl perFormAnce chArActeristics ICC (Shutdown) vs VCC ICC vs VCC ICC (Shutdown) vs TemperatureVCC (V)00 ICC ( A)102030402040608043563 G01506010305070 VCC (V)00 ICC ( A)2004006002040608043563 G02800100010305070 TEMPERATURE ( C) 500 ICC ( A)510152005010012543563 G03253530 252575 Specifications are at VCC = 12V, TA = 25 C unless otherwise more information SHDN Current vs Temperature GATE Pull-Up Current vs VCCGATE Pull-Up Current vs TemperatureGATE Pull-Down Current vs TemperatureGATE Pull-Down Current vs Temperature VGATE vs IGATETEMPERATURE ( C) 500 ISHDN ( A)12305010012543563 G04465 252575 VSHDN = 0 VVCC (V)00 IGATE ( A)10203051525352040608043563 G054010305070 TEMPERATURE ( C) 500 IGATE ( A)510152005010012543563 G06253530 252575 VGATE = VOUT = 12 VTEMPERATURE ( C) 50100 IGATE(DOWN) (mA)

9 12014016005010012543563 G07180220200 252575 OVERVOLTAGE CONDITIONVFB = ( C) 500 IGATE(DOWN) (mA)24605010012543563 G0881210 252575 OVERCURRENT CONDITION VSNS = 120mVIGATE ( A)00 VGATE (V)42681048121643563 G091214261014 VOUT = 12 VtypicAl perFormAnce chArActeristicsSpecifications are at VCC = 12V, TA = 25 C unless otherwise noted. VGATE vs Temperature VGATE vs VCCO vervoltage TMR Current vs (VCC VOUT)TEMPERATURE ( C) 50050100125 2525750 VGATE (V)42681043563 G101214 IGATE = 1 AVCC = 8 VVCC = 4 VVCC (V)02040608043563 G11103050700 VGATE (V)426810121614 IGATE = 1 AVOUT = VCCTA = 45 CTA = 25 CTA = 130 CVCC VOUT (V)00 ITMR ( A)81624322040608043563 G12404810305070 OVERVOLTAGE CONDITIONVOUT = 5 VVTMR = 1 VLT4356-3643563fcFor more information Output Low Voltage vs CurrentOvervoltage Turn-Off Time vs TemperatureOvercurrent Turn-Off Time vs TemperatureCURRENT (mA)00 VOL (V) ( C) 500100tOFF (ns)05010012543563 G17500400300200 252575 OVERVOLTAGE CONDITIONVFB = ( C) ( s)05010012543563 252575 OVERCURRENT CONDITION VSNS = 120mVVCC (V)0 ICC (mA) 10 15 8043563 G19 50 20 40 60 20 VCC = SNSR everse Current vs Reverse VoltageOvercurrent TMR Current vs (VCC VOUT)Warning Period TMR Current vs VCCTMR Pull-Down Current vs TemperatureVCC VOUT (V)00 ITMR ( A)

10 40801201602040608043563 G1320028024010305070 OVERCURRENT CONDITIONVOUT = 0 VVTMR = 1 VVCC (V)02040608043563 G14103050700 ITMR ( A)4268101214 OVERVOLTAGE, EARLYWARNING PERIODVFB = = ( C) 500 ITMR ( A)05010012543563 252575 VTMR = 1 VtypicAl perFormAnce chArActeristicsSpecifications are at VCC = 12V, TA = 25 C unless otherwise more information FunctionsAOUT (DFN and SO Packages Only): Amplifier Output. Open collector output of the auxiliary amplifier. It is capable of sinking up to 2mA from 80V. The negative input of the amplifier is internally connected to a : Open-Collector Enable Output. The EN pin goes high impedance when the voltage at the OUT pin is above (VCC ), indicating the external MOSFET is fully on. The state of the pin is latched until the OUT pin voltage resets at below and goes back up above 2V. The internal NPN is capable of sinking up to 3mA of current from 80V to drive an LED or Pad: Exposed pad may be left open or connected to device ground (GND).