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LTC4418CUF#PBF

Dual-channel prioritized PowerPath controller, 2.5-40V, 26μA Iq, ±1.5% OV/UV, 20-QFN 4x4

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Manufacturer Part：

LTC4418CUF#PBF

Package：

QFN-20 (4 x 4 x 0.75mm with exposed pad)

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Description

Product Overview

The LTC4418CUF#PBF from Analog Devices is a dual-channel prioritized PowerPath controller in a 20-lead 4x4mm QFN package. It connects one of two valid power supplies to a common output based on priority and validity, with 2.5V to 40V operating range, 26μA quiescent current, ±1.5% OV/UV protection, and fast non-overlap switchover that blocks reverse and cross conduction currents.

Key Specifications

Operating Voltage Range 2.5V to 40V
Input Protection -42V reverse, 60V tolerant V1/V2
Quiescent Current 26μA typ.
OV/UV Threshold Accuracy ±1.5%
Gate Drive Clamp 6V (protects external MOSFETs)
Validation Time Adjustable via external capacitor
Soft Start Controlled (minimizes inrush)
VALID Output Open-drain status indicators
Cascadeable Yes (with LTC4417 for 3+ inputs)
Package 20-Lead QFN (4 x 4 x 0.75mm w/ EP)
Operating Temperature 0°C to +70°C (C-grade)

Features

  • Selects highest priority valid supply from two inputs
  • Blocks reverse and cross conduction currents
  • Wide 2.5V to 40V operating voltage range
  • -42V reverse connection protection; 60V tolerant V1/V2 inputs
  • Adjustable input validation time
  • Fast switchover minimizes output voltage droop
  • Low 26μA operating quiescent current
  • ±1.5% accurate OV/UV protection thresholds
  • Adjustable overvoltage/undervoltage hysteresis
  • Cascadeable with LTC4417 for additional input supplies
  • 6V gate drive clamp for external MOSFET protection
  • Controlled soft-start minimizes inrush current

Applications

  • Industrial handheld instruments
  • High availability and redundant power systems
  • Battery backup systems
  • Servers and computer peripherals
  • Automotive dual-supply switchover

The LTC4418CUF#PBF from Analog Devices is a dual-channel prioritized PowerPath controller that connects one of two valid power supplies to a common output based on priority and validity. Priority is defined by pin assignment: V1 has higher priority, V2 has lower. A supply is valid when its voltage remains within the OV/UV window continuously for at least the configured validation time. The device incorporates fast non-overlap switching circuitry to prevent both reverse and cross conduction while minimizing output voltage droop. The gate driver includes a 6V clamp for external MOSFET protection, and controlled soft-start minimizes inrush current. Multiple LTC4418s can be cascaded for more than two input supplies.

The LTC4418 monitors two input power supplies through external resistive divider networks connected to the UV and OV pins of each channel. When an input voltage remains within its programmed undervoltage/overvoltage window for the duration of the validation time (set by an external capacitor on the TMR pin), the VALID output asserts to indicate a valid supply. The controller always connects the highest-priority valid input (V1) to the common output by driving the gate of the corresponding external P-channel MOSFET. If V1 falls outside its valid window, the V1 channel is immediately disconnected and V2 is connected with minimal switchover time. Fast non-overlap switching ensures both MOSFETs are never on simultaneously, blocking reverse and cross-conduction currents. The 6V gate clamp protects the external MOSFET gates from overvoltage.

Pin Name Type Function
1 V1 Power Input 1 supply (higher priority)
2 UV1 Input Channel 1 undervoltage threshold
3 OV1 Input Channel 1 overvoltage threshold
4 VS1 Input Channel 1 source sense for gate drive
5 G1 Output Channel 1 gate drive for external PFET
6 VALID1 Output Channel 1 valid status (open-drain)
7 GND Power Ground
8 TMR I/O Validation time adjust (external cap)
9 SHDN Input Shutdown control (active low)
10 HYS Input OV/UV hysteresis adjustment
11 INTVCC Power Internal regulated supply
12 VOUT Power Common output connection
13 VALID2 Output Channel 2 valid status (open-drain)
14 G2 Output Channel 2 gate drive for external PFET
15 VS2 Input Channel 2 source sense for gate drive
16 OV2 Input Channel 2 overvoltage threshold
17 UV2 Input Channel 2 undervoltage threshold
18 V2 Power Input 2 supply (lower priority)
  • Battery-to-wall-adapter automatic switchover in portable instruments
  • Redundant power supply ORing in high-availability servers
  • Battery backup systems with priority supply selection
  • Industrial systems requiring seamless power path transition
  • Automotive dual-battery system prioritization
Manufacturer Part Number Package Notes
ADI LTC4417IUF#PBF QFN-24 Triple-channel prioritizer
ADI LTC4419CUF#PBF QFN-20 18V dual-input micropower prioritizer
TI TPS2116APWR TSSOP-20 Dual-input power mux, 5.5V
TI TPS2120RUXR QFN-12 Dual-input ORing controller, 22V
Maxim MAX6326UR31+T SOT-23 Simple priority power controller
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All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Shipping & Payment

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Service & Packaging

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

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