Overview
The LTC4418IUF#TRPBF, produced by Analog Devices Inc., is a dual-channel prioritized PowerPath controller. This component is designed to connect one of two valid power supplies to a common output based on priority and validity. The priority is defined by pin assignment, with V1 assigned the higher priority and V2 the lower priority. The LTC4418 ensures seamless switchover between power supplies, preventing both reverse and cross conduction while minimizing output droop. It is particularly useful in systems requiring reliable and efficient power management.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Supply Voltage | 40 | V | |||
| Operating Temperature | -40 | 85 | °C | ||
| Supply Current | 52 | µA | |||
| Package Type | 20-WFQFN Exposed Pad | ||||
| FET Type | P-Channel | ||||
| Validation Time | 3.5µs (Fast Mode) | 16ms/nF |
Key Features
- Dual-channel prioritized PowerPath controller with fast non-overlap switching to prevent reverse and cross conduction.
- Internally generated 3.3V rail (INTVCC) for internal circuit power.
- Validation timers for each channel, configurable via an external capacitor.
- Overvoltage (OV) and undervoltage (UV) comparators for input supply validation.
- Gate driver with a 6V clamp to protect external MOSFETs.
- Soft-start capability to minimize output droop during switchover.
- Cascadable with other LTC4418s or LTC4417s for multiple input switchover.
Applications
The LTC4418IUF#TRPBF is suitable for various industrial and power management applications, including:
- Redundant power supply systems.
- Hot swap controllers.
- Power-over-Ethernet (PoE) systems.
- High-reliability power distribution systems.
- Systems requiring automatic switchover between power sources.
Q & A
- What is the primary function of the LTC4418IUF#TRPBF?
The primary function is to connect one of two valid power supplies to a common output based on priority and validity. - How are the priorities of the power supplies defined?
Priorities are defined by pin assignment, with V1 having higher priority than V2. - What is the operating temperature range of the LTC4418IUF#TRPBF?
The operating temperature range is -40°C to 85°C. - What type of FET does the LTC4418IUF#TRPBF use?
The LTC4418IUF#TRPBF uses P-Channel FETs. - How is the validation time for each channel configured?
The validation time is configured via an external capacitor connected to the TMR pin. - Can the LTC4418IUF#TRPBF be cascaded with other controllers?
Yes, it can be cascaded with other LTC4418s or LTC4417s for multiple input switchover. - What is the purpose of the internally generated 3.3V rail (INTVCC)?
The INTVCC rail provides power to the internal circuits of the part. - How does the LTC4418IUF#TRPBF protect external MOSFETs?
It includes a gate driver with a 6V clamp to protect external MOSFETs. - What happens when the highest priority valid input falls out of the OV/UV window?
The highest priority valid input is immediately disconnected, and the other valid input is connected to the common output. - What is the effect of pulling the SHDN pin below 1V?
Pulling the SHDN pin below 1V disconnects all channels, disables the OV and UV comparators, and resets both channel validation timers.
