LTC4381 Low Quiescent Current Surge Stopper with 9m MOSFET FEATURES DESCRIPTION n Withstands Surge Voltages Up to 100V The LTC 4381 is an integrated solution for low quiescent n Internal 9m N-Channel MOSFET current surge stopper applications that protect loads from n Guaranteed Safe Operating Area: 20ms at 70V, 1A high voltage transients. Overvoltage protection is pro- n Low Quiescent Current: 6A Operating vided by clamping the gate voltage of an internal 9m n Operates Through Automobile Cold Crank N-channel MOSFET to limit the output voltage to a safe n Wide Operating Voltage Range: 4V to 72V value during overvoltage events such as load dump in n Overcurrent Protection automobiles. The MOSFET safe operating area is pro- n Selectable Internal 28.5V/47V or Adjustable Output duction tested and guaranteed for the stresses during Clamp Voltage (Table1) high voltage transients. Fixed output clamp voltages are n Reverse Input Protection to 60V selectable for 12V and 24V/28V systems. For systems of n Adjustable Turn-On Threshold any voltage up to 80V, use the adjustable clamp versions. n Adjustable Fault Timer with MOSFET Stress Overcurrent protection is also provided. An internal mul- Acceleration tiplier generates a TMR pin current proportional to V DS n Latchoff and Retry Options (Table1) and I , so that operating time in both overcurrent and D n Low Retry Duty Cycle During Faults (Table1) overvoltage conditions is limited in accordance with n 32-Lead DFN (7mm 5mm) Package MOSFETstress. The GATE pin can drive back-to-back MOSFETs for APPLICATIONS reverse input protection, eliminating the voltage drop n Automotive 12V, 24V and 48V System and dissipation of a Schottky diode solution. A low 6A n Avionic/Industrial Surge Protection operating current permits use in always-on and battery n Hot Swap/Live Insertion poweredapplications. n High Side Switch for Battery Powered Systems All registered trademarks and trademarks are the property of their respective owners. n Automotive Load Dump Protection TYPICAL APPLICATION 12V System with 100V/0.5A/400ms Load Dump Overvoltage Protection 12V, 0.5A with 100V Overvoltage Protection 12V/0.5A 100V INPUT SURGE 80m V IN OUTPUT I = 0.5A IN SRC LOAD 12V 200k CLAMPED (100V ) PK 20k DRN SNS AT 28.5V V OUT CC V IN 22F 10 ON 20V/DIV GFET LTC4381-2 SEL GATE 12V 68V 0.1F FLT 33 V OUT 12V CMHZ5266B 20V/DIV TMR GND 47nF 4381 TA01a 10F 4381 TA01b 100ms/DIV Rev. 0 1 Document Feedback For more information www.analog.comLTC4381 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Notes 1, 2) TOP VIEW IN (Note 5) ............................................... 0.3V to 100V TMR 1 SEL V , ON, SEL ............................................... 60V to 80V 32 CC ON FLT 2 31 DRN (Note 3), SNS, OUT, SRC GND OUT 3 30 LTC4381-1/LTC4381-2 ........................... 0.3V to 53V DRN 4 29 SNS NC 5 28 NC LTC4381-3/LTC4381-4 ........................... 0.3V to 80V V 6 27 GATE CC SNS to OUT ..................................................... 5V to 5V IN 7 26 GFET GATE, GFET (Note 4) SRC IN 8 33 25 IN SRC SRC 9 24 LTC4381-1/LTC4381-2 ........................... 0.3V to 53V SRC SRC 10 23 LTC4381-3/LTC4381-4 ........................... 0.3V to 86V SRC 11 22 SRC SRC 12 21 SRC GATE to OUT, GATE to V , CC SRC 13 20 SRC GFET to SRC (Note 4) ............................ 0.3V to 10V SRC 14 SRC 19 TMR ............................................................. 0.3V to 5V SRC SRC 15 18 SRC SRC 16 17 FLT ............................................................. 0.3V to 80V I .......................................................................2.5mA DRN DKE PACKAGE 32-LEAD (7mm 5mm) PLASTIC DFN Operating Junction Temperature Range T = 150C, = 23C/W JMAX JA LTC4381C ................................................ 0C to 70C EXPOSED PAD (PIN 33) IS IN LTC4381I .............................................40C to 85C LTC4381H .......................................... 40C to 125C Storage Temperature Range .................. 65C to 150C ORDER INFORMATION TUBE TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC4381CDKE-2 PBF LTC4381CDKE-2 TRPBF 43812 32-Lead(7mm5mm)PlasticDFN 0Cto70C LTC4381IDKE-2 PBF LTC4381IDKE-2 TRPBF 43812 32-Lead(7mm5mm)PlasticDFN 40Cto85C LTC4381HDKE-2 PBF LTC4381HDKE-2 TRPBF 43812 32-Lead(7mm5mm)PlasticDFN 40Cto125C LTC4381CDKE-4 PBF LTC4381CDKE-4 TRPBF 43814 32-Lead(7mm5mm)PlasticDFN 0Cto70C LTC4381IDKE-4 PBF LTC4381IDKE-4 TRPBF 43814 32-Lead(7mm5mm)PlasticDFN 40Cto85C LTC4381HDKE-4 PBF LTC4381HDKE-4 TRPBF 43814 32-Lead(7mm5mm)PlasticDFN 40Cto125C Contact ADI Sales for LTC4381-1/LTC4381-3 option. Contact ADI Sales for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with TRMPBF suffix. Rev. 0 2 For more information www.analog.com