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Analog Devices Inc. LTC4420IDD#TRPBF
- Part No.:
- LTC4420IDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- OR Controllers, Ideal Diodes
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC4420IDD#TRPBF.pdf
- Description:
- IC SOURCE SELECTOR SWITCH 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,219
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Product details
Overview
LTC4420IDD#TRPBF from Analog Devices is a dual-input micropower PowerPath™ prioritizer IC that selects between primary (V1) and backup (V2) supplies to maintain output continuity during brownout or power loss. It features internal 2Ω PMOS switches, ±1.5% accurate adjustable switchover threshold, 3.6µA operating current, and 320nA V2 standby current when V1 powers OUT - enabling long-life battery backup in portable POS terminals.
For engineers reviewing the LTC4420IDD#TRPBF datasheet, LTC4420IDD#TRPBF pinout, LTC4420IDD#TRPBF application, or LTC4420IDD#TRPBF equivalent, key selection criteria include V1/V2 switchover voltage accuracy, V2 undervoltage monitoring duty cycle control, freshness seal mode activation, reverse voltage blocking (–15V), and thermal protection with 125°C junction limit.
Technical Context
The LTC4420IDD#TRPBF implements break-before-make switchover using dual internal PMOS switches with 1Ω typical RON, non-overlap timing of 1–5µs, and 50mV reverse conduction detection. Its ADJ comparator (1.047V threshold, ±1.5% accuracy) qualifies V1 validity for ≥64ms before connecting OUT, while V2UV monitoring uses a 0.387V reference with programmable duty cycle via V2TEST.
V2 monitoring occurs at intervals of 80–180s with durations of 1–168ms, minimizing quiescent draw; GNDSW pulsed grounding enables low-duty-cycle resistive divider activation. Freshness seal mode disables V2 discharge by holding V2DIS high and V2OK latched low until V1 reassertion triggers exit.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 1.8V to 18V on both V1 and V2 inputs - supports Li-ion, wall adapters, and primary batteries without level shifting. |
| Quiescent Current (V1 active) | 3.6µA typical - enables multi-year operation from coin cells in always-on backup systems. |
| V2 Standby Current (V1 active) | 320nA typical - prevents measurable discharge of backup Li-SOCl₂ batteries during storage. |
| Switch RON | 2Ω max per channel - limits 500mA load dropout to ≤1V at full rated current. |
| Switchover Threshold Accuracy | ±1.5% over temperature - ensures predictable V1-to-V2 transition within tight system voltage margins. |
| V2 Undervoltage Monitor Accuracy | ±2.3% over temperature - guarantees reliable hold-up battery disconnect before critical voltage collapse. |
| Reverse Voltage Blocking | –15V on inactive input - protects against accidental reverse polarity connection or backfeed. |
Pinout & Package
Package: 12-lead (3mm × 3mm) plastic DFN with exposed pad (GND), rated for –40°C to +85°C industrial temperature range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V1 | Primary power input | Supplies OUT when valid; must exceed 1.55V and sustain ADJ ≥1.097V for 64ms to qualify. |
| V2 | Backup power input | Supplies OUT only after V1 invalidation or during freshness seal exit; monitored via V2UV/GNDSW divider. |
| OUT | Priority-switched output | Delivers power from V1 or V2; requires ≥50mV headroom below active input to enable connection. |
| ADJ | V1 switchover threshold input | Resistive divider sets V1-to-V2 transition point; 1.047V falling threshold with 50mV hysteresis. |
| V2UV | V2 undervoltage monitor input | Resistive divider referenced to 0.387V; GNDSW pulsed grounding enables low-duty-cycle monitoring. |
| V2DIS | V2 path disable control | Drives low to disconnect V2 from OUT when V2UV falls below threshold - prevents weak battery loading. |
| V2OK | V2 validity status output | Open-drain logic output pulled high (5µA) when V2UV > 0.387V at end of monitoring interval. |
| GNDSW | Pulsed ground for V2UV divider | Activates V2 monitoring by grounding divider bottom node; duty cycle controlled by V2TEST. |
| CMP1 | Auxiliary voltage monitor input | Non-inverting input to 0.387V comparator; used for independent supply fault detection or warning. |
| CMPOUT1 | Auxiliary comparator output | Open-drain output pulled low when CMP1 < 0.387V - enables early power failure signaling. |
| GND | Device ground reference | Common return for all circuitry; exposed pad must be soldered to PCB ground plane for thermal/EMI performance. |
| V2TEST | V2 monitoring duty cycle control | High = ~0.1% monitoring duty cycle; low = disables V2 monitoring entirely when V1 is valid. |
Key Features
| Feature | Design Value |
|---|---|
| Freshness seal mode | Prevents V2 battery self-discharge during shipment/storage by disabling V2 monitoring and disconnecting V2 path until V1 reassertion. |
| Low-duty-cycle V2 monitoring | V2UV sampling every 80–180s for 1–168ms - reduces average V2 current to sub-nA levels in long-term backup. |
| Break-before-make switchover | 1–5µs non-overlap time prevents cross-conduction and reverse current flow during source transitions. |
| Reverse supply protection | Withstands –15V on inactive V1 or V2 input - eliminates need for external reverse-polarity diodes. |
| Overcurrent & thermal protection | Current-limited to 0.5–1.6A with foldback; shuts down above 125°C junction temperature to prevent damage. |
Applications
| Portable Medical Monitors | Point-of-Sale (POS) Terminals |
|---|---|
Use Scenario: Battery-backed ECG or glucose meter maintains real-time data logging during AC adapter removal or low-battery alert. IC Role / Device Role / Timing Role: LTC4420IDD#TRPBF acts as seamless power arbitrator between main Li-ion pack and backup coin cell, ensuring uninterrupted memory write and display refresh. Use Value: 320nA V2 standby current extends 200mAh CR2032 backup life beyond 20 years; ±1.5% switchover accuracy prevents premature fallback. |
Use Scenario: Retail terminal continues transaction processing during brief AC outage or battery swap in kiosk mode. IC Role / Device Role / Timing Role: LTC4420IDD#TRPBF prioritizes wall adapter (V1), then switches to Li-SOCl₂ hold-up battery (V2) with <5µs break-before-make to avoid transaction corruption. Use Value: 3.6µA quiescent draw minimizes main battery drain; V2TEST-controlled monitoring preserves 10+ year shelf life of primary backup cell. |
| Industrial Data Loggers | Ruggedized Handheld Scanners |
Use Scenario: Remote sensor node logs environmental data continuously across seasonal power interruptions in unattended field deployments. IC Role / Device Role / Timing Role: LTC4420IDD#TRPBF manages solar-charged LiFePO₄ (V1) and non-rechargeable Li-SOCl₂ (V2), enforcing 6V undervoltage cutoff to prevent deep discharge. Use Value: ±2.3% V2UV accuracy ensures precise end-of-life detection; –15V reverse blocking tolerates wiring faults in harsh installations. |
Use Scenario: Warehouse scanner operates from removable main battery but retains RAM and clock during hot-swap cycles. IC Role / Device Role / Timing Role: LTC4420IDD#TRPBF provides glitch-free power handoff between user-swappable Li-ion (V1) and onboard supercapacitor (V2) backup. Use Value: 2Ω RON limits voltage drop to <1V at 500mA peak scan current; freshness seal prevents cap leakage during shelf storage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power path prioritization applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4412EMS#PBF | Single-input prioritizer; no V2 monitoring or freshness seal; 1.2A current limit; MSOP-10 package. | Lacks dual-supply validation, V2UV control, and low-duty-cycle monitoring - suitable only for simple OR-ing with fixed thresholds. | Select when only basic V1/V2 priority switching is needed without battery health management. |
| TPS2113APWR | TI dual-input prioritizer; 2.7–5.5V range; 1.2A limit; no programmable thresholds or V2 monitoring; 10-pin WSON. | Restricted to 5V systems; no reverse blocking beyond –0.3V; no freshness seal or ultra-low V2 standby current. | Choose for cost-sensitive 3.3V/5V embedded designs where extended backup life is not required. |
Compared with LTC4420IDD#TRPBF, LTC4412EMS#PBF omits V2 supervision and ultra-low-quiescent monitoring, while TPS2113APWR lacks reverse protection, wide voltage range, and battery preservation features - making LTC4420IDD#TRPBF uniquely suited for long-life, multi-voltage, field-deployed backup systems.
Availability
LTC4420IDD#TRPBF is available at Aetrix Electronics and suitable for portable medical monitors, point-of-sale terminals, and industrial data loggers requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC4420IDD#TRPBF 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 is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, power management, and reliability-critical systems.
The LTC4420IDD#TRPBF belongs to Analog Devices' PowerPath™ product line, engineered specifically for seamless, low-power, dual-supply redundancy in battery-backed and mission-critical portable electronics.
FAQ
What is the maximum reverse voltage the LTC4420IDD#TRPBF can block on its V1 or V2 inputs?
The LTC4420IDD#TRPBF blocks reverse voltages up to –15V on either V1 or V2 inputs when that input is inactive. This specification is guaranteed under Absolute Maximum Ratings and enables direct connection to unregulated sources without external reverse-protection diodes. The device maintains this blocking capability across its full –40°C to +85°C operating range, and the LTC4420IDD#TRPBF's internal architecture prevents latch-up or damage even during transient reverse conditions.
How does the LTC4420IDD#TRPBF achieve 320nA V2 standby current when V1 is active?
The LTC4420IDD#TRPBF achieves 320nA V2 standby current by fully disabling the V2 power path and placing the V2UV monitoring circuit in ultra-low-duty-cycle mode. When V1 powers OUT, the internal control logic disconnects V2's PMOS switch and gates off GNDSW pulsing - eliminating divider current and reducing leakage through V2UV/CMP1 pins to sub-nA levels. This behavior is confirmed in Electrical Characteristics tables and validated across temperature, and the LTC4420IDD#TRPBF maintains this performance without external biasing or configuration.
Can the LTC4420IDD#TRPBF be used with a 24V input supply?
No - the LTC4420IDD#TRPBF has an absolute maximum input voltage rating of 24V on V1 and V2, but its recommended operating range is strictly 1.8V to 18V. Operation at 24V violates the specified operating conditions and risks permanent damage due to overstress, especially under thermal or transient conditions. For 24V systems, a front-end regulator or clamp is required before the LTC4420IDD#TRPBF input, and the LTC4420IDD#TRPBF itself must remain within its 18V max operating limit.
What is the purpose of the GNDSW pin on the LTC4420IDD#TRPBF, and how is it used?
The GNDSW pin on the LTC4420IDD#TRPBF is an open-drain output that pulses low to activate the V2UV resistive divider during periodic V2 undervoltage monitoring. It enables low-duty-cycle sensing by grounding the bottom node of the V2–V2UV–GNDSW divider only during measurement windows - reducing average V2 current to nanoscale levels. GNDSW is not a general-purpose ground; it must be connected only as part of the V2UV monitoring network, and leaving it floating or misconnected will disable V2 supervision. This function is integral to the LTC4420IDD#TRPBF's battery longevity design.
Does the LTC4420IDD#TRPBF support automatic exit from freshness seal mode?
Yes - the LTC4420IDD#TRPBF automatically exits freshness seal mode when a valid V1 supply (≥1.55V) is applied and the ADJ pin remains ≥1.097V for 32ms. During exit, the device re-enables V2 monitoring, releases V2DIS, and prepares the V2 path for switchover. No external reset or command is required. This behavior is hardwired into the LTC4420IDD#TRPBF's control logic and is independent of V2 voltage or state - ensuring reliable reactivation after storage or shipment without manual intervention.
LTC4420IDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PowerPath™
- Package/Case:
- 12-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Source Selector Switch
- FET Type:
- N-Channel
- Ratio - Input:Output:
- 2:1
- Internal Switch(s):
- Yes
- Delay Time - ON:
- -
- Delay Time - OFF:
- -
- Current - Output (Max):
- 1.6A
- Current - Supply:
- 3.6 µA
- Voltage - Supply:
- 1.8V ~ 18V
- Applications:
- Battery Backup
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (3x3)
LTC4420IDD#TRPBF FAQ
1.How can I place an order for LTC4420IDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4420IDD#TRPBF 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 LTC4420IDD#TRPBF reliable?
The price and inventory of LTC4420IDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4420IDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4420IDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4420IDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4420IDD#TRPBF?
LTC4420IDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4420IDD#TRPBF 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 LTC4420IDD#TRPBF?
For technical support, including LTC4420IDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4420IDD#TRPBF requirements.
6.How does Aetrix verify that LTC4420IDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4420IDD#TRPBF 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 LTC4420IDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4420IDD#TRPBF?
All LTC4420IDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4420IDD#TRPBF, 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 LTC4420IDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC4420IDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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