Analog Devices Inc. LTC4368IDD-1#WTRPBF

Overview

LTC4368IDD-1#WTRPBF from Analog Devices is a bidirectional electronic circuit breaker and UV/OV/reverse supply protection controller for 2.5V–60V input systems. It controls back-to-back N-channel MOSFETs to protect loads from –40V reverse voltage, +100V overvoltage, and forward/reverse overcurrent faults (±50mV sense threshold). Designed for automotive-grade industrial power rails, it delivers 80µA operating current, 32ms turn-on delay for AC blocking, and AEC-Q100 qualification (–40°C to 85°C).

For engineers reviewing the LTC4368IDD-1#WTRPBF datasheet, LTC4368IDD-1#WTRPBF pinout, LTC4368IDD-1#WTRPBF application, or LTC4368IDD-1#WTRPBF equivalent, key selection criteria include its –50mV reverse overcurrent threshold (LTC4368-1 variant), adjustable ±1.5% UV/OV thresholds via resistive dividers, latch-off vs auto-retry configuration via RETRY pin, and DFN-10 (3mm × 3mm) package with exposed pad grounding option.

Technical Context

The LTC4368IDD-1#WTRPBF implements dual high-speed comparators (1µs propagation) for UV (0.5V falling threshold, 25mV hysteresis) and OV (0.5V rising threshold, 25mV hysteresis), each driving a 60mA GATE pull-down sink. Its bidirectional current sensing uses a single SENSE–VOUT differential input with fixed +50mV (forward) and –50mV (reverse) thresholds-specific to the -1 variant.

Gate drive employs an internal charge pump delivering up to 13.1V enhancement (GATE–VOUT) across VIN = 2.5V–60V, with fast (6µs) and slow (575µs) turn-off paths. A 32ms recovery delay enforces stable power-good window validation before re-enabling MOSFETs after UV/OV faults or hot-swap events.

Key Specifications

Pinout & Package

Package: 10-lead (3mm × 3mm) plastic DFN with exposed pad (pin 11), rated for –40°C to +85°C ambient operation and θ_JA = 43°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bidirectional overvoltage/overcurrent protection applications.

Compared with LTC4368IDD-2#WTRPBF, the LTC4368IDD-1#WTRPBF offers higher reverse fault immunity ideal for automotive jump-start scenarios, while TPS26631RGER lacks reverse protection entirely-making it unsuitable for applications requiring bidirectional fault coverage.

Availability

LTC4368IDD-1#WTRPBF is available at Aetrix Electronics and suitable for automotive power distribution, industrial DC power rails, and portable test equipment requiring stable component supply with AEC-Q100 assurance and extended temperature operation.

Supply support for LTC4368IDD-1#WTRPBF 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 semiconductors, serving industrial, automotive, communications, and healthcare markets.

The LTC4368 product line delivers integrated UV/OV/reverse/overcurrent protection for DC power inputs, designed specifically for automotive and industrial systems demanding robust fault tolerance without external discrete protection components.

FAQ

What is the reverse overcurrent threshold of the LTC4368IDD-1#WTRPBF?

The LTC4368IDD-1#WTRPBF has a fixed –50mV reverse overcurrent threshold (SENSE–VOUT), meaning it asserts FAULT and disables GATE when reverse current exceeds I_REV = 50mV / R_SENSE. This value is specific to the "-1" variant and differs from the –3mV threshold of the LTC4368-2 family members. The threshold is accurate across –40°C to +85°C and does not require calibration.

How does the LTC4368IDD-1#WTRPBF handle AC input rejection?

The LTC4368IDD-1#WTRPBF incorporates a fixed 32ms turn-on delay that blocks 50Hz and 60Hz AC power by requiring sustained valid DC input before enabling GATE. This delay also applies after UV/OV fault clearance, preventing chattering during noisy line conditions. The feature operates independently of external components and is inherent to the IC's internal timing architecture.

Can the LTC4368IDD-1#WTRPBF be used with P-channel MOSFETs?

No-the LTC4368IDD-1#WTRPBF is explicitly designed to drive back-to-back N-channel MOSFETs only. Its gate drive architecture provides voltage enhancement above VOUT (up to 13.1V) to fully enhance N-MOSFETs, and it lacks the negative voltage generation needed for P-MOSFET gate control. Using P-channel devices would violate the device's operational specification and result in improper protection behavior.

What is the purpose of the exposed pad on the LTC4368IDD-1#WTRPBF DFN package?

The exposed pad (pin 11) on the LTC4368IDD-1#WTRPBF DFN package is optional and may be left unconnected or tied to PCB ground. When grounded, it improves thermal dissipation (reducing θ_JA) and provides additional noise immunity for the internal comparators and charge pump. No electrical functionality depends on this connection, and Analog Devices specifies it as optional in the absolute maximum ratings table.

Does the LTC4368IDD-1#WTRPBF require external components to set UV and OV thresholds?

Yes-the LTC4368IDD-1#WTRPBF requires external resistor dividers connected to the UV and OV pins to set user-defined undervoltage and overvoltage trip points. The internal comparators have fixed 0.5V thresholds, so the dividers scale VIN to match. For example, a 7V UV threshold requires a 14:1 divider ratio. Leakage current at these pins is <1nA, enabling high-value resistors to minimize power loss.