Analog Devices Inc. LTC4420IMSE#TRPBF

Overview

LTC4420IMSE#TRPBF from Analog Devices is a dual-input micropower PowerPath™ prioritizer IC that selects between primary (V1) and backup (V2) supplies to maintain continuous power to critical loads during brownout or main supply loss. It features internal 2Ω PMOS switches, ±1.5% accurate adjustable switchover threshold, 3.6µA operating current, 320nA V2 standby current when V1 is active, and operates across 1.8V–18V input range. Used in battery-backed POS terminals and portable medical monitors where uninterrupted operation is essential.

For engineers reviewing the LTC4420IMSE#TRPBF datasheet, LTC4420IMSE#TRPBF pinout, LTC4420IMSE#TRPBF application, or LTC4420IMSE#TRPBF equivalent, key selection criteria include verified break-before-make switchover time (1–5µs), V2 freshness seal mode for Li-SOCl₂ battery preservation, dual independent voltage monitoring (ADJ & V2UV), reverse supply protection to –15V, and thermal shutdown with overcurrent limiting.

Technical Context

The LTC4420IMSE#TRPBF implements a priority-based power arbitration architecture using two independent comparators: ADJ (1.047V threshold, ±1.5% accuracy) controls V1-to-V2 switchover, while V2UV (0.387V reference, ±2.3% accuracy) governs V2 undervoltage detection. Its low-duty-cycle V2 monitoring-programmable via V2TEST-reduces average V2 quiescent current to <650nA.

Break-before-make switching is enforced by fast non-overlap circuitry (tSWITCH = 1–5µs) and reverse conduction blocking (VREV = 25–75mV turn-on threshold). The device integrates overcurrent protection (ILIM = 0.5–1.6A), thermal shutdown, and reverse voltage blocking up to –15V on inactive inputs.

Key Specifications

Pinout & Package

The LTC4420IMSE#TRPBF is housed in a thermally enhanced 12-lead plastic MSOP package with exposed pad (pin 13), rated for –40°C to +85°C operation. The exposed pad must be soldered to PCB ground for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-input power prioritization applications.

Compared with LTC4420IMSE#TRPBF, LTC4412EMS#TRPBF omits backup supervision entirely, while TPS2113APWR lacks programmability, reverse protection, and freshness seal-making LTC4420IMSE#TRPBF uniquely suited for long-life, battery-critical systems requiring precise, low-power dual-source management.

Availability

LTC4420IMSE#TRPBF is available at Aetrix Electronics and suitable for point-of-sale terminals, portable medical monitors, industrial data loggers, and ruggedized handheld scanners requiring stable component supply across extended temperature ranges and multi-year deployments.

Supply support for LTC4420IMSE#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 leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving precision instrumentation, industrial automation, and power management markets.

The LTC4420IMSE#TRPBF belongs to Analog Devices' PowerPath™ family of intelligent power-switching ICs, designed specifically for ultra-low-power, high-reliability backup power management in battery-critical applications.

FAQ

What is the maximum reverse voltage the LTC4420IMSE#TRPBF can block on its V1 and V2 inputs?

The LTC4420IMSE#TRPBF blocks reverse voltages up to –15V on both V1 and V2 inputs without damage or latch-up, as specified in its Absolute Maximum Ratings. This capability enables robust deployment in environments prone to accidental reverse polarity connection, such as field-serviceable battery compartments or industrial power distribution nodes. The reverse blocking function is inherent to the internal PMOS switch architecture and requires no external components.

How does the LTC4420IMSE#TRPBF achieve 320nA V2 standby current when V1 is active?

The LTC4420IMSE#TRPBF achieves 320nA V2 standby current by completely disabling the V2-to-OUT power path and placing the V2UV monitoring circuit into ultra-low-duty-cycle mode when V1 is valid. During this state, the GNDSW pin remains high (open), disconnecting the V2–V2UV–GNDSW resistive divider, and internal bias currents to V2-related comparators are minimized. This behavior is confirmed in the Electrical Characteristics table (IV2, V2 Current, V1 Powering OUT) and validated across temperature.

Can the LTC4420IMSE#TRPBF be used with a 24V input on V1 or V2?

No, the LTC4420IMSE#TRPBF cannot be used with a 24V input on V1 or V2. Its Absolute Maximum Rating for V1 and V2 is 24V, but the recommended operating voltage range is strictly 1.8V to 18V per the Electrical Characteristics table. Applying 24V violates the operational specification and risks parametric degradation or premature failure, even if below absolute maximum limits. For 24V systems, a pre-regulator or alternative IC with higher voltage rating is required.

What is the purpose of the GNDSW pin on the LTC4420IMSE#TRPBF, and how is it used in the V2UV monitoring circuit?

The GNDSW pin on the LTC4420IMSE#TRPBF is an open-drain output pulsed low during V2UV monitoring intervals to provide a controlled ground reference for the external V2–V2UV–GNDSW resistive divider. When GNDSW is released high, the divider is disconnected, eliminating standby current. This architecture enables the ultra-low average V2 current (<650nA) by activating the divider only for brief durations (1–168ms) every 80–180 seconds, as configured by V2TEST.

Does the LTC4420IMSE#TRPBF support simultaneous powering from V1 and V2?

No, the LTC4420IMSE#TRPBF does not support simultaneous powering from V1 and V2. It implements strict break-before-make switching: the V1-to-OUT path is fully disabled before the V2-to-OUT path is enabled, and vice versa. This prevents cross-conduction, reverse current flow, and output droop exceeding 100mV. The non-overlap time is guaranteed at 1–5µs (tSWITCH), and the internal logic enforces mutual exclusivity per Table 1 in the Applications Information section.