Linear Technology AN107-1 Application Note: Extending PowerPath Input Voltage Range

About this manual

The document explains how to modify Linear Technology's PowerPath controller circuits (specifically models LTC4411, LTC4412HV, and LTC4414) to withstand large negative voltages, such as reverse adapter inputs. It details a circuit using a Schottky diode to block negative supply paths while maintaining control functionality.

What's inside

• Introduction
• Extending the Voltage Range
• Circuit for Large Negative Input Voltages
• Control and Status Pins with Negative Supply
• Circuit for Large Positive Input Voltages
• Zener Diode Clamping

Frequently asked questions

Which PowerPath circuits can have their voltage range extended?

Any of Linear's PowerPath controller circuits, including the LTC4412HV, LTC4414, and LTC4411.

What component is used to extend the negative input voltage range?

A Schottky diode is added between the ground and control pins to hold the external P-channel pass transistor in the off state.

What component clamps large positive input voltages?

A Zener diode is connected to the input power supply to clamp the voltage between the Vin and ground pins.