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Product Attributes

Introduction

The LTC4364 surge stopper with ideal diode controller protects loads from damage due to high-voltage transients. By controlling the voltage drop across an external N-channel MOSFET pass device, it limits and regulates the output during overvoltage events such as load dump in automotive applications. The LTC4364 also includes a timed current limit circuit breaker. During a fault condition, an adjustable fault timer must expire before the pass device is turned off. The LTC4364-1 latches off the pass device, while the LTC4364-2 automatically restarts after a delay. The LTC4364 accurately monitors input supply overvoltage (OV) and undervoltage (UV) conditions. The external MOSFET remains off during undervoltage conditions, and auto-retry is disabled during overvoltage conditions. An integrated ideal diode controller drives a second MOSFET to replace a Schottky diode for reverse output protection and output voltage holdup. The LTC4364 controls the forward voltage drop across the MOSFET and minimizes reverse current transients during power failures, power-down, or input short-circuit events.

Features

• Wide operating voltage range: 4V to 80V
• VCC clamp supports surges exceeding 80V
• Adjustable output clamp voltage
• Ideal diode controller maintains output voltage during input power loss
• Reverse input protection to -40V
• Reverse output protection to -20V
• Overcurrent protection
• Low shutdown current: 10uA (at 12V)
• Adjustable fault timer
• Retry duty cycle of 0.1% during fault (LTC4364-2)
• Available in 4mm×3mm 14-lead DFN, 16-lead MSOP, and 16-lead SO packages

Applications

• Automotive electronics surge protection
• Hot-swap / live insertion
• Redundant power supply "OR" output port protection