LTC1696 Overvoltage Protection Controller FEATURESDESCRIPTION n ±2% Overvoltage Threshold Accuracy The LTC®1696 is a standalone power supply overvolt- n Low Profile (1mm) ThinSOT ™ Package age monitor and protection device designed to protect a n Gate Drive for SCR Crowbar or External N-Channel power supply load in the event of an overvoltage fault. It Disconnect MOSFET monitors two adjustable output voltages. If an overvoltage n Monitors Two Output Voltages condition is detected, the output drives either an external n Senses Output Voltages from 0.8V to 24V SCR crowbar or turns off external back-to-back N-channel n Wide Supply Range: 2.7V to 27V MOSFETs, thereby, disconnecting the input voltage from n Multifunction TIMER/RESET Pin the power supply. Pin 6 offers three functions. By connecting a capacitor to this pin, the internal glitch filter time delay can be APPLICATIONS programmed. Without the capacitor, the default time n Telecommunication Systems delay is determined by an internal capacitor. This pin also n Computer Systems serves as a reset input to clear the internal latch after an n Industrial Control Systems overvoltage fault condition. By pulling it high, the OUT n Notebook Computers pin is activated if the FB1 and FB2 voltages remain below the trip threshold. The LTC1696 is available in the low profile (1mm) ThinSOT package. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation.All other trademarks are the property of their respective owners. . TYPICAL APPLICATIONSCR CrowbarOvervoltage Response VOUT2 V POWER 5V CC 12V SUPPLY V FB1 OUT1 3.3V 0.5V/DIV R2 R4 TIMER/RESET 137k 232k 1% 2V/DIV 1 TIMER/ 6 1% FB1 RESET C1 Q1 RESET R1 1nF 2N7002 44.2k LTC1696 IOUT 1% 2 5 20mA/DIV GND FB2 R3 44.2k C1 = 1nF 1% 3 4 VCC OUT 100µs/DIV 1696 TA02 SCR C2 2N6507 0.1µF 1696 TA01 1696fb For more information www.linear.com/LTC1696 1
