Overview
The LTC4352CMS#TRPBF, produced by Analog Devices Inc., is a Low Voltage Ideal Diode Controller with Monitoring. This device creates a near-ideal diode using an external N-channel MOSFET, replacing high power Schottky diodes and associated heat sinks. It is designed to save power and reduce board area, making it ideal for low loss power ORing and supply holdup applications. The LTC4352 regulates the forward voltage drop across the MOSFET to ensure smooth current transfer and minimizes reverse currents during input supply failures or shorts.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Voltage Range | 2.9V to 18V | V |
| VCC Supply Voltage Range | 2.9V to 6V | V |
| Forward Voltage Drop (VIN - OUT) | 25mV | mV |
| Gate Drive Voltage | 5V to 7.5V | V |
| Package Type | 12-Pin MSOP and DFN (3mm × 3mm) | |
| Operating Temperature Range | -40°C to 85°C (Commercial), -40°C to 150°C (Industrial) | °C |
Key Features
- Creates a near-ideal diode using an external N-channel MOSFET, replacing high power Schottky diodes and heat sinks.
- Regulates the forward voltage drop across the MOSFET to 25mV for smooth current transfer.
- Fast turn-on and turn-off to minimize load voltage droop and reverse currents.
- Open MOSFET detect circuit to flag excessive voltage drop across the pass transistor.
- Reverse current enable input (REV) to override diode behavior when desired.
- Inrush control capability for hot-plugged input supplies.
- Power passage disabled during undervoltage or overvoltage conditions.
Applications
- Low loss power ORing and supply holdup applications.
- Telecom infrastructure.
- Computer systems and servers.
- Inrush control in hot swap cards.
- Redundant power supplies.
Q & A
- What is the primary function of the LTC4352?
The LTC4352 creates a near-ideal diode using an external N-channel MOSFET, replacing high power Schottky diodes and associated heat sinks.
- What is the operating voltage range of the LTC4352?
The operating voltage range is from 2.9V to 18V.
- What is the forward voltage drop regulated by the LTC4352?
The forward voltage drop is regulated to 25mV.
- What types of packages are available for the LTC4352?
The LTC4352 is available in 12-Pin MSOP and DFN (3mm × 3mm) packages.
- What is the purpose of the REV pin on the LTC4352?
The REV pin enables reverse current, overriding the diode behavior when desired.
- How does the LTC4352 handle inrush current in hot-plugged applications?
The LTC4352 can be used for inrush control by using a RC network on the gate to slow down the output dV/dt, allowing fast turn-off during reverse current or overvoltage conditions.
- What are some common applications of the LTC4352?
Common applications include low loss power ORing, supply holdup, telecom infrastructure, computer systems and servers, and redundant power supplies.
- What is the operating temperature range of the LTC4352?
The operating temperature range is -40°C to 85°C for commercial grade and -40°C to 150°C for industrial grade.
- How does the LTC4352 protect against undervoltage or overvoltage conditions?
Power passage is disabled during undervoltage or overvoltage conditions to protect the system.
- What is the purpose of the open MOSFET detect circuit in the LTC4352?
The open MOSFET detect circuit flags excessive voltage drop across the pass transistor in the on state.
