Overview
The LTC4417IUF#PBF, manufactured by Analog Devices Inc., is a Prioritized PowerPath™ Controller designed to connect one of three valid power supplies to a common output based on predefined priority. This device ensures seamless switchover between power supplies, prioritizing them based on pin assignment, with V1 having the highest priority and V3 the lowest. It incorporates fast non-overlap switching circuitry to prevent reverse and cross conduction, minimizing output voltage droop and protecting external MOSFETs with a 6V clamp.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Operating Supply Range | V1-V3, VOUT | 2.5 | 36 | V | |
| Absolute Maximum Ratings (Supply Voltages) | V1, V2, V3 | -42 | 42 | V | |
| Absolute Maximum Ratings (Output Voltages) | VOUT, VS1, VS2, VS3 | -0.3 | 42 | V | |
| Operating Current | 28 | µA | |||
| Current Draw from Supplies Less than VOUT | <1 | µA | |||
| Switching Time | 0.9 | 1.3 | 2 | µs |
Key Features
- Prioritized switchover between three power supplies based on predefined priority.
- Fast non-overlap switching to prevent reverse and cross conduction.
- Wide operating voltage range: 2.5V to 36V.
- Protection against reverse battery connection up to -42V.
- Low operating current of 28µA and minimal current draw from supplies less than VOUT (<1µA).
- Controlled output ramp to minimize start-up inrush current.
- Open drain VALID outputs to indicate input supplies within their OV/UV window for 256ms.
Applications
- Selects the highest priority supply from three inputs.
- Blocks reverse and cross conduction currents.
- Suitable for systems requiring reliable power supply switchover, such as in automotive, industrial, and medical devices.
- Used in hot swap controllers, ideal diode bridges, and power distribution systems.
Q & A
- What is the primary function of the LTC4417IUF#PBF? The primary function is to connect one of three valid power supplies to a common output based on predefined priority.
- How does the LTC4417IUF#PBF prioritize power supplies? It prioritizes power supplies based on pin assignment, with V1 having the highest priority and V3 the lowest.
- What is the operating voltage range of the LTC4417IUF#PBF? The operating voltage range is from 2.5V to 36V.
- How does the device protect against reverse battery connection? It protects against reverse battery connection up to -42V.
- What is the typical operating current of the LTC4417IUF#PBF? The typical operating current is 28µA.
- How does the device minimize start-up inrush current? It uses a controlled output ramp to minimize start-up inrush current.
- What is indicated by the open drain VALID outputs? The open drain VALID outputs indicate that the input supplies have been within their OV/UV window for 256ms.
- Can multiple LTC4417 devices be cascaded? Yes, two or more LTC4417s can be cascaded to provide switchover between more than three inputs.
- What type of packaging does the LTC4417IUF#PBF come in? It comes in a 24-pin QFN (4x4) package.
- Is the LTC4417IUF#PBF RoHS compliant? Yes, the LTC4417IUF#PBF is RoHS compliant.
