LT4356-3 (Rev. D) - Analog Devices

1 LT4356-3 . Surge Stopper with Fault Latchoff FEATURES DESCRIPTION. n Stops High Voltage Surges The LT 4356-3 surge stopper protects loads from high n Adjustable Output Clamp Voltage voltage transients. It regulates the output during an n Overcurrent Protection overvoltage event, such as load dump in automobiles, by n Wide Operation Range: 4V to 80V controlling the gate of an external N-channel MOSFET. The n Reverse Input Protection to 60V output is limited to a safe value thereby allowing the loads n Low 7 A Shutdown Current to continue functioning. The LT4356-3 also monitors the n Adjustable Latchoff Fault Timer voltage drop between the VCC and SNS pins to protect n Controls N-channel MOSFET against overcurrent faults. An internal amplifier limits n Shutdown Pin Withstands 60V to 100V the current sense voltage to 50mV. In either fault condi- n Fault Output Indication tion, a timer is started inversely proportional to MOSFET. n Auxiliary Amplifier for Level Detection Comparator or stress.

2 If the timer expires, the FLT pin pulls low to warn Linear Regulator Controller of an impending power down. If the condition persists, n Available in 12-Pin 4mm 3mm DFN, the MOSFET is turned off, until the SHDN pin pulls low 10-Pin MSOP, and 16-Pin SO Packages momentarily. The auxiliary amplifier may be used as a voltage detection APPLICATIONS comparator or as a linear regulator controller driving an n Automotive/Avionic Surge Protection external PNP pass transistor. n Hot Swap/Live Insertion Back-to-back FETs can be used in lieu of a Schottky diode n High Side Switch for Battery Powered Systems for reverse input protection, reducing voltage drop and All registered trademarks and trademarks are the property of their respective owners. power loss. The SHDN input turns off the part, including the auxiliary amplifier, and reduces the quiescent current to less than 7 A. TYPICAL APPLICATION. 4A, 12V Overvoltage Output Regulator Overvoltage Protector Regulates Output at 27V During Transient 10m IRLR2908 VOUT.

3 VIN. 12V 80V INPUT SURGE CTMR = F. ILOAD = 500mA. 10 102k VIN. VCC SNS GATE OUT 20V/DIV. 383k FB. SHDN VCC. 12V. DC-DC 27V ADJUSTABLE CLAMP. IN+ LT4356DE-3 VOUT. CONVERTER. 20V/DIV. 100k EN SHDN GND 12V. UNDERVOLTAGE AOUT FLT FAULT LT4356-3TA01b GND TMR 100ms/DIV. 43563 TA01. F. Rev D. For more information 1. LT4356-3 . ABSOLUTE MAXIMUM RATINGS (Notes 1 and 2). VCC, 60V to 100V 40 C to 125 C. VCC 30V or 60V to VCC + 55 C to 125 C. OUT, AOUT, FLT, to 80V Storage Temperature Range GATE (Note 3).. to VOUT + 10V 65 C to 125 C. FB, TMR, IN+.. to 6V MS, 65 C to 150 C. AOUT, EN, FLT, IN+.. 3mA Lead Temperature (Soldering, 10 sec). Operating Temperature Range MS, 300 C. 0 C to 70 C. 40 C to 85 C. PIN CONFIGURATION. TOP VIEW. TOP VIEW. TMR 1 16 IN+. TMR 1 12 IN+. FB 2 15 NC. TOP VIEW. FB 2 11 AOUT. NC 3 14 AOUT. FB 1 10 TMR. OUT 3 10 GND OUT 2 9 GND OUT 4 13 NC. 13 GATE 3 8 EN. GATE 4 9 EN GATE 5 12 GND. SNS 4 7 FLT. SNS 5 8 FLT VCC 5 6 SHDN NC 6 11 EN. VCC 6 7 SHDN MS PACKAGE SNS 7 10 FLT.

4 10-LEAD PLASTIC MSOP. TJMAX = 125 C, JA = 160 C/W VCC 8 9 SHDN. DE PACKAGE. 12-LEAD (4mm 3mm) PLASTIC DFN. S PACKAGE. TJMAX = 125 C, JA = 43 C/W 16-LEAD PLASTIC SO. EXPOSED PAD (PIN 13) PCB GND CONNECTION OPTIONAL. TJMAX = 150 C, JA = 100 C/W. ORDER INFORMATION. LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE. LT4356 CDE-3#PBF LT4356 CDE-3#TRPBF 43563 12-Lead (4mm 3mm) Plastic DFN 0 C to 70 C. LT4356 IDE-3#PBF LT4356 IDE-3#TRPBF 43563 12-Lead (4mm 3mm) Plastic DFN 40 C to 85 C. LT4356 HDE-3#PBF LT4356 HDE-3#TRPBF 43563 12-Lead (4mm 3mm) Plastic DFN 40 C to 125 C. LT4356 CMS-3#PBF LT4356 CMS-3#TRPBF LTFFK 10-Lead Plastic MSOP 0 C to 70 C. LT4356 IMS-3#PBF LT4356 IMS-3#TRPBF LTFFK 10-Lead Plastic MSOP 40 C to 85 C. LT4356 HMS-3#PBF LT4356 HMS-3#TRPBF LTFFK 10-Lead Plastic MSOP 40 C to 125 C. LT4356 MPMS-3#PBF LT4356 MPMS-3#TRPBF LTGGZ 10-Lead Plastic MSOP 55 C to 125 C. LT4356CS-3#PBF LT4356CS-3#TRPBF LT4356S-3 16-Lead Plastic SO 0 C to 70 C. LT4356IS-3#PBF LT4356IS-3#TRPBF LT4356S-3 16-Lead Plastic SO 40 C to 85 C.

5 LT4356HS-3#PBF LT4356HS-3#TRPBF LT4356S-3 16-Lead Plastic SO 40 C to 125 C. LT4356 MPS-3#PBF LT4356 MPS-3#TRPBF LT4356 MPS-3 16-Lead Plastic SO 55 C to 125 C. Rev D. 2 For more information LT4356-3 . ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25 C. VCC = 12V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS. VCC Operating Voltage Range l 4 80 V. ICC VCC Supply Current VSHDN = Float l 1 mA. VSHDN = 0V, IN+ = 7 25 A. LT4356C, LT4356I l 7 30 A. LT4356H, LT4356MP l 7 40 A. IR Reverse Input Current VSNS = VCC = 30V, SHDN Open l 1 mA. VSNS = VCC = VSHDN = 30V l 2 mA. VGATE GATE Pin Output High Voltage VCC = 4V; (VGATE VOUT) l 8 V. 80V VCC 8V; (VGATE VOUT) l 10 16 V. IGATE(UP) GATE Pin Pull-Up Current VGATE = 12V; VCC = 12V; LT4356C, LT4356I, LT4356H l 4 23 36 A. VGATE = 12V; VCC = 12V; LT4356MP l 4 23 38 A. VGATE = 48V; VCC = 48V l 30 50 A. IGATE(DN) GATE Pin Pull-Down Current Overvoltage, VFB = , VGATE = 12V l 75 150 mA.

6 Overcurrent, VCC VSNS = 120mV, VGATE = 12V l 4 10 mA. Shutdown Mode, VSHDN = 0V, VGATE = 12V l 5 mA. VFB FB Pin Servo Voltage VGATE = 12V, VOUT = 12V; LT4356C, LT4356I l V. VGATE = 12V, VOUT = 12V; LT4356H, LT4356MP l V. IFB FB Pin Input Current VFB = l 1 A. VSNS Overcurrent Fault Threshold VSNS = (VCC VSNS), VCC = 12V; LT4356C, LT4356I l 45 50 55 mV. VSNS = (VCC VSNS), VCC = 12V; LT4356H l 50 55 mV. VSNS = (VCC VSNS), VCC = 12V; LT4356MP l 50 56 mV. VSNS = (VCC VSNS), VCC = 48V; LT4356C, LT4356I l 46 51 56 mV. l VSNS = (VCC VSNS), VCC = 48V; LT4356H 43 51 56 mV. l VSNS = (VCC VSNS), VCC = 48V; LT4356MP 43 51 57 mV. ISNS SNS Pin Input Current VSNS = VCC = 12V to 48V l 5 10 22 A. ILEAK FLT, EN Pins Leakage Current FLT, EN = 80V l A. AOUT Pin Leakage Current AOUT = 80V A. ITMR TMR Pin Pull-up Current VTMR = 1V, VFB = , (VCC VOUT) = l 4 A. VTMR = 1V, VFB = , (VCC VOUT) = 75V l 44 50 56 A. VTMR = , VFB = , (VCC VOUT) = 75V l A. VTMR = 1V, VSNS = 60mV, (VCC VOUT) = l A. l VTMR = 1V, VSNS = 60mV, (VCC VOUT) = 80V 195 260 325 A.

7 TMR Pin Pull-down Current VTMR = 1V, VFB = 1V, VSNS = 0V l A. VTMR TMR Pin Thresholds FLT From High to Low, VCC = 5V to 80V l V. VTMR Early Warning Period From FLT going Low to GATE Going Low, VCC = 5V to 80V l 80 100 120 mV. VIN+ IN+ Pin Threshold l V. IIN+ IN+ Pin Input Current + = VIN l 1 A. VOL FLT, EN, AOUT Pins Output Low ISINK = 2mA l 2 8 V. ISINK = l 300 800 mV. IOUT OUT Pin Input Current VOUT = VCC = 12V; LT4356C, LT4356I, LT4356H l 200 300 A. VOUT = VCC = 12V; LT4356MP l 200 310 A. VOUT = VCC = 12V, VSHDN = 0V l 6 14 mA. VOUT OUT Pin High Threshold VOUT = VCC VOUT; EN From Low to High l V. Rev D. For more information 3. LT4356-3 . ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25 C. VCC = 12V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS. VSHDN SHDN Pin Threshold VCC = 12V to 48V V. l V. VSHDN(FLT) SHDN Pin Resting Voltage VCC = 12V to 48V, Note 4 l V.

8 ISHDN SHDN Pin Current VSHDN = 0V l 1 4 8 A. tOFF(OC) Overcurrent Turn Off Delay Time GATE From High to Low, VSNS = 0 120mV; LT4356C, LT4356I, LT4356H l 2 4 s LT4356MP l 2 s tOFF(OV) Overvoltage Turn Off Delay Time GATE From High to Low, VFB = 0 l 1 s Note 1: Stresses beyond those listed under Absolute Maximum Ratings Note 3: An internal clamp limits the GATE pin to a minimum of 10V above may cause permanent damage to the device. Exposure to any Absolute the OUT pin. Driving this pin to voltages beyond the clamp may damage Maximum Rating condition for extended periods may affect device the device. reliability and lifetime. Note 4: Resting voltage after turn-on. Note 2: All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to GND unless otherwise specified. TYPICAL PERFORMANCE CHARACTERISTICS. Specifications are at VCC = 12V, TA = 25 C unless otherwise noted. ICC vs VCC ICC (Shutdown) vs VCC ICC (Shutdown) vs Temperature 1000 60 35.

9 50 30. 800. 25. 40. 600. 20. ICC ( A). ICC ( A). ICC ( A). 30. 15. 400. 20. 10. 200. 10 5. 0 0 0. 0 10 20 30 40 50 60 70 80 0 10 20 30 40 50 60 70 80 50 25 0 25 50 75 100 125. VCC (V) VCC (V) TEMPERATURE ( C). 43563 G02 43563 G01 43563 G03. Rev D. 4 For more information LT4356-3 . TYPICAL PERFORMANCE CHARACTERISTICS. Specifications are at VCC = 12V, TA = 25 C unless otherwise noted. GATE Pull-Up Current vs SHDN Current vs Temperature GATE Pull-Up Current vs VCC Temperature 6 40 35. VSHDN = 0V VGATE = VOUT = 12V. 35 30. 5. 30. 25. 4. 25. ISHDN ( A). IGATE ( A). IGATE ( A). 20. 3 20. 15. 15. 2. 10. 10. 1. 5 5. 0 0 0. 50 25 0 25 50 75 100 125 0 10 20 30 40 50 60 70 80 50 25 0 25 50 75 100 125. TEMPERATURE ( C) VCC (V) TEMPERATURE ( C). 43563 G04 43563 G05 43563 G06. GATE Pull-Down Current vs GATE Pull-Down Current vs Temperature Temperature VGATE vs IGATE. 220 12 14. OVERVOLTAGE CONDITION OVERCURRENT CONDITION VOUT = 12V. VFB = VSNS = 120mV. 200 10 12. 10. 180 8. IGATE(DOWN) (mA). IGATE(DOWN) (mA).

10 VGATE (V). 8. 160 6. 6. 140 4. 4. 120 2. 2. 100 0 0. 50 25 0 25 50 75 100 125 50 25 0 25 50 75 100 125 0 2 4 6 8 10 12 14 16. TEMPERATURE ( C) TEMPERATURE ( C) IGATE ( A). 43563 G07 43563 G08 43563 G09. Overvoltage TMR Current vs VGATE vs Temperature VGATE vs VCC (VCC VOUT). 14 16 48. IGATE = 1 A OVERVOLTAGE CONDITION. TA = 130 C VOUT = 5V. 12 14. VCC = 8V 40 VTMR = 1V. 12 TA = 45 C. 10. 32. 10 TA = 25 C. VGATE (V). VGATE (V). ITMR ( A). 8. 8 24. 6. 6. VCC = 4V 16. 4. 4. 2 8. 2 I. GATE = 1 A. VOUT = VCC. 0 0 0. 50 25 0 25 50 75 100 125 0 10 20 30 40 50 60 70 80 0 10 20 30 40 50 60 70 80. TEMPERATURE ( C) VCC (V) VCC VOUT (V). 43563 G10 43563 G11 43563 G12. Rev D. For more information 5. LT4356-3 . TYPICAL PERFORMANCE CHARACTERISTICS. Specifications are at VCC = 12V, TA = 25 C unless otherwise noted. Overcurrent TMR Current vs Warning Period TMR Pull-Down Current vs (VCC VOUT) TMR Current vs VCC Temperature 280 14 OVERCURRENT CONDITION OVERVOLTAGE, EARLY VTMR = 1V. VOUT = 0V WARNING PERIOD.