Overview
The LTC4353IDE#TRPBF, produced by Analog Devices Inc., is a dual low voltage ideal diode controller designed to control external N-channel MOSFETs. This device emulates the function of two ideal diodes, replacing high power Schottky diodes and their associated heat sinks, thereby saving power and reducing board area. It is particularly useful in power supply ORing and supply holdup applications, ensuring smooth current transfer and minimizing power loss.
Key Specifications
| Parameter | Value |
|---|---|
| Package Type | 16-Pin Plastic DFN or MSOP |
| Temperature Range | –40°C to 85°C |
| Input Voltage Range (VIN1, VIN2) | –2V to 24V |
| VCC Voltage Range | –0.3V to 6.5V |
| GATE1, GATE2 Voltage Range | –0.3V to 34V |
| CPO1, CPO2 Voltage Range | –0.3V to 34V |
| EN1, EN2, ONST1, ONST2 Voltage Range | –0.3V to 24V |
| CPO1, CPO2 Average Current | 10mA |
| ONST1, ONST2 Currents | 5mA |
| Operating Supply Voltage | 2.9V to 18V |
Key Features
- Controls external N-channel MOSFETs to emulate two ideal diodes, reducing power loss and heat generation.
- Regulates the forward-voltage drop across the MOSFET to ensure smooth current transfer in diode-OR applications.
- Fast turn-on and turn-off capabilities to minimize load voltage droop and reverse-current transients.
- Operates with input supplies down to 0V, requiring an external supply at the VCC pin if necessary.
- Includes built-in charge pumps for fast gate pull-up and turn-off.
- Low current consumption when both EN pins are high.
Applications
- Redundant power supply systems with ORing on backplanes, such as in MicroTCA systems.
- Supply holdup applications to maintain supply voltages during input voltage sags or brownouts.
- High availability systems requiring parallel connected power supplies or battery feeds.
- Cable drop compensation and current limit switches.
Q & A
- What is the primary function of the LTC4353IDE#TRPBF?
The primary function is to control external N-channel MOSFETs to emulate two ideal diodes, replacing high power Schottky diodes and their associated heat sinks. - What are the temperature ranges for the LTC4353IDE#TRPBF?
The temperature range is –40°C to 85°C. - What is the input voltage range for VIN1 and VIN2?
The input voltage range is –2V to 24V. - How does the LTC4353IDE#TRPBF handle input supply short-circuits?
The device detects the failure condition and turns off the MOSFET by rapidly pulling down its gate to minimize reverse-current transients. - What are the key benefits of using the LTC4353IDE#TRPBF in power supply ORing applications?
The key benefits include low loss power supply ORing, smooth current transfer, and reduced power loss compared to traditional Schottky diodes. - Can the LTC4353IDE#TRPBF operate with input supplies down to 0V?
Yes, but it requires powering the VCC pin with an external supply in the 2.9V to 6V range. - What is the purpose of the charge pumps in the LTC4353IDE#TRPBF?
The charge pumps are used for fast gate pull-up and turn-off of the MOSFETs. - How does the LTC4353IDE#TRPBF minimize current consumption?
The device minimizes current consumption by holding the MOSFET off when the EN pin is above 0.6V or the VCC pin is below 2.55V, and by lowering current consumption when both EN pins are high. - What types of applications benefit from the LTC4353IDE#TRPBF?
Applications include redundant power supply systems, supply holdup applications, and high availability systems requiring parallel connected power supplies or battery feeds. - What are the important features of the MOSFETs driven by the LTC4353IDE#TRPBF?
The important features include maximum drain-source voltage (BVDSS), maximum gate-source voltage (VGS(MAX)), and the on-resistance (RDS(ON)).
