LTC7860 High Efficiency Switching Surge Stopper Fea T Descrip T n High Efficiency V Clamp Stops High Voltage The LTC 7860 high efficiency surge stopper protects loads OUT Input Surges from high voltage transients. High efficiency permits n SWITCH-ON Mode 100% Duty Cycle for Normal Operation higher currents and smaller solution sizes. During an n PROTECTIVE PWM Mode for Transients and Faults input overvoltage event, such as a load dump in vehicles, n the LTC7860 controls the gate of an external MOSFET to V Pin to SGND Range: 3.5V to 60V IN + n act as a switching DC/DC regulator (PROTECTIVE PWM External Input Voltage is Extendable to 200V n mode). This operation regulates the output voltage to a Adjustable Output Voltage Clamp n safe level, allowing the loads to operate through the input Adjustable Output Overcurrent Protection n over-voltage event. During normal operation (SWITCH- Power Inductor Improves Input EMI in Normal Operation ON mode), the LTC7860 turns on the external MOSFET n Programmable Fault Timer continuously, passing the input voltage through to the n Adjustable Soft-Start for Input Inrush Current Limiting output. An internal comparator limits the voltage across n 4.5% Retry Duty Cycle During Faults the current sense resistor and regulates the maximum n Adjustable Switching Frequency: 50kHz to 850kHz output current to protect against overcurrent faults. n Optional Reverse Input Voltage Protection n Available in Thermally Enhanced 12-lead MSOP Package An adjustable timer limits the time that the LTC7860 can spend in overvoltage or overcurrent regulation. When the a T timer expires, the external MOSFET is turned off until the LTC7860 restarts after a cool down period. By strictly n Industrial and Automotive Power limiting the time in PROTECTIVE PWM Mode when the n Telecom Power power loss is high, the components and thermal design n Vehicle Power Including ISO7637 can be optimized for normal operation and safely oper- n Military Power Including MIL1275 ate through high voltage input surges and/or overcurrent L, LT, LTC, LTM, OPTI-LOOP, Linear Technology, Burst Mode and the Linear logo are registered faults. An additional PMOS can be added for reverse trademarks and Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 5731694. battery protection. Typical a T V V IN OUT 6.8H 12m 60V MAX 18V MAX 12V NOM 12V NOM PROTECTIVE PWM: V Clamped OUT 3.5V MIN 10F 3.5V MIN to 18V During a V Surge IN 5A 60V INPUT SURGE C = 22F TMR 1M V V IN FBN 10V/DIV V FB FREQ 10F 0.47F 18V ADJUSTABLE CLAMP V OUT LTC7860 TMR CAP 10V/DIV 22F V TMR 48.7k RUN 1V/DIV 680pF 0.1F SS 10k 7860 TA01b ITH 0.1F 100ms/DIV SGND PGND 7860 TA01a 7860f 1 For more information www.linear.com/LTC7860 VIN SENSE GATE ion pplica ions pplica ion uresLTC7860 a T e Maxi Mu M r a T p c F T (Notes 1, 2) TOP VIEW Input Supply Voltage (V ) ......................... 0.3V to 65V IN 1 TMR 12 GATE V -V Voltage ...................................... 0.3V to 6V IN SENSE 2 V FREQ 11 IN SGND 3 10 SENSE 13 V -V Voltage ........................................ 0.3V to 10V IN CAP SS 4 PGND 9 CAP RUN Voltage............................................... 0.3V to 65V V 5 8 RUN FB ITH 6 7 V FBN V , TMR Voltages ..................................... 0.3V to 6V FBN MSE PACKAGE SS, ITH, FREQ, V Voltages ........................ 0.3V to 5V FB 12-LEAD PLASTIC MSOP Operating Junction Temperature Range T = 150C, = 40C/W, = 10C/W JMAX JA JC EXPOSED PAD (PIN 13) IS PGND, MUST BE SOLDERED TO PCB (Notes 3, 4) ........................................ 55C to 150C Storage Temperature Range .................. 65C to 150C Lead Temperature (Soldering, 10 sec) MSOP Package .................................................300C o r D i n F Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC7860EMSE PBF LTC7860EMSE TRPBF 7860 12-Lead Plastic MSOP 40C to 125C LTC7860IMSE PBF LTC7860IMSE TRPBF 7860 12-Lead Plastic MSOP 40C to 125C LTC7860HMSE PBF LTC7860HMSE TRPBF 7860 12-Lead Plastic MSOP 40C to 150C LTC7860MPMSE PBF LTC7860MPMSE TRPBF 7860 12-Lead Plastic MSOP 55C to 150C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: