Analog Devices Inc. LTC4368HDD-2#WPBF

Overview

LTC4368HDD-2#WPBF from Analog Devices is a high-reliability bidirectional electronic circuit breaker and UV/OV/reverse protection controller for automotive and industrial power rails. It operates from 2.5V to 60V input, provides ±1.5% adjustable undervoltage/overvoltage thresholds, features –3mV reverse current sense threshold, 80µA operating current, and controls back-to-back N-channel MOSFETs in a 3mm × 3mm DFN package rated for –40°C to 125°C.

For engineers reviewing the LTC4368HDD-2#WPBF datasheet, LTC4368HDD-2#WPBF pinout, LTC4368HDD-2#WPBF application, or LTC4368HDD-2#WPBF equivalent, key selection considerations include its AEC-Q100 qualification, –40V to 100V fault protection range, 32ms turn-on debounce, reverse battery protection capability, and RETRY pin-configurable forward overcurrent auto-retry or latch-off behavior.

Technical Context

The LTC4368HDD-2#WPBF implements dual fast comparators (1µs propagation) with 25mV hysteresis on UV and OV inputs, enabling precise ±1.5% voltage window control via external resistive dividers. Its bidirectional current sensing uses separate forward (+50mV) and reverse (–3mV) thresholds referenced to SENSE–VOUT, with independent fault response logic.

Gate drive employs an internal charge pump delivering up to 13.1V enhancement above VOUT, supporting low-R_DS(on) N-MOSFETs. Fault recovery enforces a 32ms delay before re-enabling GATE after UV/OV clearance, and reverse current reconnection requires VIN–VOUT ≥ 75mV (typical) to prevent oscillation during marginal conditions.

Key Specifications

Pinout & Package

Package: 10-Lead (3mm × 3mm) Plastic DFN, exposed pad (optional ground connection), rated for –40°C to +125°C ambient.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bidirectional protection controller applications.

Compared with LTC4368HDD-1#WPBF and TPS26631RHFR, the LTC4368HDD-2#WPBF uniquely combines AEC-Q100 qualification, –3mV reverse sensitivity, and true bidirectional fault response-making it the only option for automotive-grade reverse battery protection with automatic recovery.

Availability

LTC4368HDD-2#WPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC I/O modules, energy storage BMS interfaces, and portable test equipment requiring stable component supply across extended temperature ranges.

Supply support for LTC4368HDD-2#WPBF 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 precision instrumentation, industrial automation, and automotive markets.

The LTC4368 product line delivers robust front-end protection for DC power rails, designed specifically for automotive and industrial applications demanding AEC-Q100 compliance, wide fault tolerance, and bidirectional current control.

FAQ

What is the reverse current sense threshold of the LTC4368HDD-2#WPBF?

The LTC4368HDD-2#WPBF has a reverse current sense threshold of –3mV (SENSE–VOUT), optimized for detecting low-level reverse polarity events such as battery misconnection. This value is fixed for the -2 variant and differs from the –50mV threshold of the LTC4368HDD-1#WPBF. The –3mV threshold enables earlier disconnection in reverse-battery scenarios while maintaining compatibility with standard current-sense resistor values.

Does the LTC4368HDD-2#WPBF support automatic recovery after a reverse current fault?

Yes, the LTC4368HDD-2#WPBF automatically reconnects the load after a reverse current fault when VIN falls at least 75mV below VOUT (ΔVRR ≥ 75mV typical). This behavior is inherent to the device's architecture and does not require external timing components. The 32ms turn-on delay applies only after UV/OV faults clear; reverse fault recovery occurs immediately upon meeting the ΔVRR condition, enabling seamless operation in energy storage and backup power applications.

How is the overvoltage and undervoltage window configured on the LTC4368HDD-2#WPBF?

The LTC4368HDD-2#WPBF uses external resistive dividers on the OV and UV pins to set user-defined thresholds. Each input has a precise 0.5V comparator reference with 25mV hysteresis and <10nA leakage, allowing high-value resistors (e.g., 1MΩ range) to minimize power loss. For example, a 7V–36V window is achieved using R1=29.4kΩ, R2=121kΩ, R3=1.5MΩ per the datasheet design procedure. The resulting accuracy is ±1.5% over temperature.

What package and thermal characteristics does the LTC4368HDD-2#WPBF have?

The LTC4368HDD-2#WPBF is housed in a 10-lead 3mm × 3mm plastic DFN package with an exposed pad (pin 11), rated for –40°C to +125°C ambient operation. Its thermal resistance is θ_JA = 43°C/W with proper PCB copper pour. The exposed pad may be left unconnected or tied to PCB ground to improve thermal performance and EMI shielding-no solder mask opening is required for functional operation.

Is the LTC4368HDD-2#WPBF pin-compatible with other variants in the LTC4368 family?

Yes, all LTC4368 variants-including LTC4368HDD-2#WPBF, LTC4368HDD-1#WPBF, and LTC4368IMS-2#WPBF-share identical pinouts and electrical interfaces across DFN and MSOP packages. The only functional differences are the reverse current threshold (–3mV vs. –50mV) and temperature grade (H-grade = –40°C to +125°C). This allows direct substitution in existing layouts when upgrading to automotive qualification or adjusting reverse sensitivity.