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Analog Devices Inc. LTC4418CUF#PBF
- Part No.:
- LTC4418CUF#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- OR Controllers, Ideal Diodes
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC4418CUF#PBF.pdf
- Description:
- IC CTRLR DUAL PWRPATH 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,256
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Product details
Overview
LTC4418CUF#PBF from Analog Devices is a dual-channel prioritized PowerPath™ controller IC that selects and switches between two input supplies (V1 higher priority, V2 lower priority) to a common output based on validity (OV/UV window compliance) and priority. It supports 2.5V–40V input range, provides –42V reverse connection protection, features 6V-gatedrive clamping for external P-MOSFETs, and delivers fast break-before-make switchover (≤4µs) with soft-start to limit inrush. It is used in battery backup systems where seamless failover from primary to secondary supply is required.
For engineers reviewing the LTC4418CUF#PBF datasheet, LTC4418CUF#PBF pinout, LTC4418CUF#PBF application, or LTC4418CUF#PBF equivalent, key selection criteria include validated dual-supply prioritization logic, ±1.5% OV/UV threshold accuracy, adjustable validation timing via TMR capacitor, non-overlap gate control preventing cross-conduction, and cascading capability with LTC4417/LTC4418 via CAS/EN interface.
Technical Context
The LTC4418CUF#PBF implements a precision dual-channel power arbitration architecture using independent OV/UV comparators per channel, each referenced to a stable 1V internal bandgap. Validity requires continuous voltage compliance within user-defined OV/UV windows for a configurable time (3.5µs to 32ms), enforced by an internal validation timer tied to the TMR pin.
Its gate drivers feature 6.2V clamp (VS–VG), 28–120mA pull-down strength, and controlled soft-start (~4V/ms slew). Switchover uses break-before-make timing (≤4µs) with VGS-off detection (0.3V threshold) and reverse-voltage blocking (125mV VREV threshold) to prevent backfeed and cross-conduction during transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 40V - supports wide-range industrial, server, and battery-backed systems without level-shifting. |
| Reverse Protection | –42V on V1/V2 - prevents damage from accidental reverse polarity connection of input supplies. |
| OV/UV Threshold Accuracy | ±1.5% - ensures precise fault detection across temperature and supply variations, minimizing false trips. |
| Break-Before-Make Time | 1µs to 4µs - eliminates shoot-through current between input channels during switchover. |
| Operating Current | 26µA typical - enables ultra-low quiescent power in always-on backup power management. |
| Validation Timing Range | 3.5µs to 32ms - programmable via TMR capacitor to reject transients while ensuring reliable supply qualification. |
| Gate Drive Clamp | 6.2V (VS–VG) - protects external P-MOSFET gates from overvoltage stress during switching. |
Pinout & Package
20-lead 4mm × 4mm plastic QFN package (UF) with exposed thermal pad (Pin 21, optional GND connection). Pin pitch: 0.5mm. RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TMR (1) | Validation timer control | Capacitor-connected node setting switchover validation delay; 1nF → ~7ms; tie to INTVCC for fast mode (3.5µs). |
| UV1, UV2 (2, 4) | Undervoltage sense inputs | Monitor falling edge of V1/V2 via resistive divider; trigger invalidation when <0.985V (1V ±1.5%). |
| OV1, OV2 (3, 5) | Overvoltage sense inputs | Monitor rising edge of V1/V2 via resistive divider; trigger invalidation when >1.015V (1V ±1.5%). |
| VALID1, VALID2 (6, 7) | Open-drain status outputs | Pull low when respective input is valid (within OV/UV window ≥tVALID); rated to 40V, require external pull-up. |
| G1, G2 (13, 11) | P-MOSFET gate drivers | Drive external high-side P-channel MOSFETs; clamp at 6.2V below VS1/VS2; support 28–120mA turn-off current. |
| V1, V2 (17, 16) | Priority-ranked input supplies | V1 = higher-priority source; V2 = lower-priority backup; both tolerate –42V to +60V absolute max. |
| CAS (9) | Cascade output | Drives EN of downstream LTC4417/LTC4418 to enable multi-input prioritized switchover chains. |
| EN, SHDN (18, 19) | Enable & shutdown controls | EN toggles channel connection without resetting timers; SHDN disables all logic, resets timers, pulls CAS high. |
Key Features
| Feature | Design Value |
|---|---|
| Priority-based dual-input arbitration | Hardwired priority (V1 > V2) ensures deterministic failover without software or external logic. |
| Adjustable OV/UV hysteresis | HYS pin supports fixed 30mV internal hysteresis or externally programmable (50–500nA) for noise immunity tuning. |
| Reverse conduction blocking | 125mV VREV comparator prevents backfeed from VOUT to V1/V2 during switchover or fault conditions. |
| Cascadable architecture | CAS output drives EN of secondary controllers, enabling 3+ input prioritized systems with no added timing complexity. |
| Soft-start controlled inrush | ~4V/ms gate ramp limits peak inrush into large output capacitors, reducing MOSFET stress and input droop. |
Applications
| Industrial Handheld Instruments | High Availability Systems |
|---|---|
|
Use Scenario: Portable test equipment powered by rechargeable Li-ion battery (V1) with USB-C wall adapter (V2) as backup. IC Role / Device Role / Timing Role: LTC4418CUF#PBF arbitrates between battery and adapter, prioritizing battery during normal operation and seamlessly switching to adapter when battery drops below UV threshold. Use Value: Eliminates manual power selection; maintains uninterrupted operation during hot-swap charging; prevents battery over-discharge via precise 1V ±1.5% UV detection. |
Use Scenario: Rack-mounted telecom line card requiring redundant 12V DC inputs (primary telecom feed + secondary PoE-derived supply). IC Role / Device Role / Timing Role: LTC4418CUF#PBF acts as automatic failover switch, validating both inputs against ±5% OV/UV windows before connecting highest-priority valid source to system rail. Use Value: Achieves <10µs switchover with no output droop beyond 50mV (with 120µF output cap); supports hot-plug redundancy without firmware intervention. |
| Battery Backup Systems | Servers and Computer Peripherals |
|
Use Scenario: UPS subsystem for embedded controller using supercapacitor (V1) and main 5V rail (V2), where V1 must supply during AC outage. IC Role / Device Role / Timing Role: LTC4418CUF#PBF monitors supercap voltage decay and triggers switchover to V2 only after V1 falls below UV threshold for ≥7ms (TMR=1nF), rejecting brief dips. Use Value: Prevents motor-boating caused by transient droop; extends supercap life by avoiding unnecessary cycling; supports –42V reverse tolerance during capacitor polarity reversal events. |
Use Scenario: Motherboard VRM auxiliary power path combining ATX 12V (V1) and PCIe 3.3V standby (V2) for always-on management controller. IC Role / Device Role / Timing Role: LTC4418CUF#PBF selects V1 when present; falls back to V2 during ATX power loss; uses CAS/EN cascade to coordinate with secondary LTC4418 for third supply if needed. Use Value: Enables zero-downtime firmware updates and remote management during main power interruption; validates inputs with ±1.5% OV/UV accuracy to avoid false shutdowns. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel prioritized power-path applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4417CUF#PBF | Triple-channel version (3 inputs); same pinout, identical OV/UV accuracy and gate drive specs; adds third VALID3/CAS2 pins. | Required when >2 input sources must be prioritized; not drop-in for dual-input designs due to extra pins and logic. | Select LTC4417CUF#PBF only when expanding to three or more prioritized supplies; shares layout compatibility but requires PCB revision. |
| TPS2113APWR | Single-channel auto-switching IC; no OV/UV window validation; relies on simple voltage comparison; no TMR or hysteresis adjustment. | Suitable for basic OR-ing where priority is voltage-based only; lacks fault filtering, reverse blocking, and cascading. | Choose TPS2113APWR for cost-sensitive, non-critical applications without need for programmable validation timing or reverse protection. |
Compared with LTC4418CUF#PBF, LTC4417CUF#PBF adds scalability for triple-input systems but increases BOM count and layout complexity, while TPS2113APWR sacrifices precision fault detection and robustness for simplicity and lower cost-making LTC4418CUF#PBF optimal for mission-critical, validated switchover.
Availability
LTC4418CUF#PBF is available at Aetrix Electronics and suitable for industrial handheld instruments, high availability systems, and battery backup systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC4418CUF#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. (ADI) is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and power management.
The LTC4418CUF#PBF belongs to ADI's PowerPath™ controller product line, designed specifically for intelligent, priority-based power source selection in systems demanding reliability, reverse protection, and seamless switchover without microcontroller intervention.
FAQ
What is the operating temperature range for the LTC4418CUF#PBF?
The LTC4418CUF#PBF is specified for 0°C to 70°C ambient operation (Commercial grade). Its absolute maximum junction temperature is 150°C, and thermal resistance is θJA = 47°C/W. This makes it suitable for enclosed industrial enclosures and non-extended-temperature computing peripherals where airflow is limited but ambient stays within commercial bounds. The LTC4418CUF#PBF does not support industrial-grade (–40°C to 85°C) operation - that requires the LTC4418IUF#PBF variant.
How does the LTC4418CUF#PBF prevent reverse current flow from VOUT to V1 or V2?
The LTC4418CUF#PBF integrates a dedicated reverse-voltage comparator (REV) that monitors the difference between VOUT and the selected input (V1 or V2). Connection is delayed until VOUT droops at least 125mV below the input voltage (VREV = 125mV), ensuring the external P-MOSFET body diode remains reverse-biased during switchover. This hardware-enforced blocking occurs independently of OV/UV validation and applies to both channels, making LTC4418CUF#PBF suitable for systems with shared output rails and asymmetric input sources.
Can the LTC4418CUF#PBF be used with N-channel MOSFETs?
No - the LTC4418CUF#PBF is designed exclusively for external P-channel MOSFETs. Its G1/G2 gate drivers are high-side, sinking-type outputs referenced to VS1/VS2, and incorporate a 6.2V clamp (VS–VG) optimized for P-MOS gate control. Driving N-channel devices would require level-shifting, additional charge pumps, and violate the IC's internal logic assumptions about source-node referencing. Using N-MOSFETs with LTC4418CUF#PBF is not supported and risks improper switching or device damage.
What happens to the VALID1 and VALID2 outputs during shutdown (SHDN low)?
When SHDN is driven below its 0.6V threshold, the LTC4418CUF#PBF disables all internal comparators and resets both validation timers. As a result, VALID1 and VALID2 release (go high-impedance/open-drain) - they do not actively pull high or low. Their state depends entirely on external pull-up configuration. This behavior allows downstream monitoring circuits to distinguish between "input invalid" (VALIDx pulled low) and "controller disabled" (VALIDx floating), which is critical for system-level fault diagnosis in high-availability designs using LTC4418CUF#PBF.
Is the LTC4418CUF#PBF pin-compatible with other variants in the LTC4418 family?
Yes - all LTC4418 variants (LTC4418CUF#PBF, LTC4418CUF#TRPBF, LTC4418IUF#PBF, LTC4418IUF#TRPBF) share identical 20-lead 4mm × 4mm QFN (UF) packaging, pinout, and electrical interface. Temperature grade (C vs I) and packaging format (tube vs tape-and-reel) are the only differences. This allows direct substitution during prototyping or volume production without layout changes, provided thermal and reliability requirements align with the selected grade.
LTC4418CUF#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PowerPath™
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Source Selector Switch
- FET Type:
- P-Channel
- Ratio - Input:Output:
- 2:1
- Internal Switch(s):
- No
- Delay Time - ON:
- -
- Delay Time - OFF:
- -
- Current - Output (Max):
- -
- Current - Supply:
- 52 µA
- Voltage - Supply:
- 40V
- Applications:
- Industrial
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (4x4)
LTC4418CUF#PBF FAQ
1.How can I place an order for LTC4418CUF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4418CUF#PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC4418CUF#PBF reliable?
The price and inventory of LTC4418CUF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4418CUF#PBF is usually 5 days.
3.What payment methods are accepted for LTC4418CUF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4418CUF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4418CUF#PBF?
LTC4418CUF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4418CUF#PBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC4418CUF#PBF?
For technical support, including LTC4418CUF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4418CUF#PBF requirements.
6.How does Aetrix verify that LTC4418CUF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4418CUF#PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC4418CUF#PBF meets industry standards.
7.What is the process for return or replacement of LTC4418CUF#PBF?
All LTC4418CUF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4418CUF#PBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC4418CUF#PBF part is unused and in its original packaging.
Return procedure for LTC4418CUF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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