Analog Devices Inc. LTC4368IDD-2#WTRPBF

Overview

LTC4368IDD-2#WTRPBF from Analog Devices is a bidirectional electronic circuit breaker and UV/OV protection controller for 2.5V–60V input supplies, featuring –3mV reverse overcurrent threshold, ±1.5% adjustable voltage thresholds, and 80µA operating current. It controls back-to-back N-channel MOSFETs to protect loads in automotive surge protection, energy storage systems, and portable instrumentation against –40V reverse, 100V overvoltage, and forward/reverse overcurrent faults.

For engineers reviewing the LTC4368IDD-2#WTRPBF datasheet, LTC4368IDD-2#WTRPBF pinout, LTC4368IDD-2#WTRPBF application, or LTC4368IDD-2#WTRPBF equivalent, key selection criteria include its –40°C to +85°C industrial temperature grade, 10-pin 3mm × 3mm DFN package with exposed pad, AEC-Q100 qualification, and precise –3mV reverse current sense threshold distinguishing it from the –50mV LTC4368-1 variant.

Technical Context

The LTC4368IDD-2#WTRPBF integrates dual high-accuracy comparators (UV/OV) with 25mV hysteresis and fast 1µs propagation, plus forward (+50mV) and reverse (–3mV) current-sense comparators referenced to SENSE–VOUT. Its internal charge pump delivers up to 13.1V gate drive enhancement relative to VOUT, enabling low-R_DS(on) N-MOSFET operation across the full 2.5V–60V input range.

It implements a 32ms turn-on delay to debounce live connections and block 50/60Hz AC, while enforcing identical 32ms recovery delays after UV/OV faults. Reverse fault recovery requires VIN–VOUT ≥ 75mV (typical), and forward fault response supports either latch-off (RETRY grounded) or auto-retry (RETRY capacitor-configured).

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 UV/OV and bidirectional overcurrent protection applications.

Compared with LTC4368IDD-1#WTRPBF, the LTC4368IDD-2#WTRPBF offers finer reverse current sensitivity for low-loss energy transfer, while TPS26631RGER trades bidirectional protection and extended fault range for monolithic integration and lower BOM count in unidirectional systems.

Availability

LTC4368IDD-2#WTRPBF is available at Aetrix Electronics and suitable for automotive battery protection, energy storage system interfaces, and industrial 24V power distribution requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC4368IDD-2#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 precision instrumentation, industrial automation, communications, and automotive markets.

The LTC4368 product line delivers highly integrated, AEC-Q100-qualified protection controllers for demanding power-supply interface applications, emphasizing bidirectional fault coverage, ultra-low quiescent current, and robust operation across –40V to 100V fault conditions.

FAQ

What is the reverse overcurrent threshold of the LTC4368IDD-2#WTRPBF?

The LTC4368IDD-2#WTRPBF features a –3mV reverse overcurrent threshold (SENSE–VOUT), optimized for low-loss bidirectional current sensing in energy storage and regenerative systems. This value is fixed for the -2 variant and differs from the –50mV threshold of the LTC4368-1 family members. The threshold is specified over the full –40°C to +85°C temperature range with minimal drift, enabling accurate reverse fault detection without calibration.

How does the LTC4368IDD-2#WTRPBF handle reverse battery connection?

The LTC4368IDD-2#WTRPBF blocks reverse battery connections by turning off both external N-channel MOSFETs when VIN falls below –2.2V (reverse UVLO) or when reverse current exceeds –3mV across R_SENSE. Its internal circuitry automatically connects GATE to VIN during negative input conditions, ensuring rapid MOSFET turn-off. Recovery occurs only after VOUT falls ≥100mV below VIN and the 32ms turn-on delay expires, preventing chatter during marginal conditions.

Is the LTC4368IDD-2#WTRPBF pin-compatible with other LTC4368 variants?

Yes, the LTC4368IDD-2#WTRPBF is pin-compatible with all other LTC4368 variants in the same package type (10-lead DFN or MSOP), including LTC4368IDD-1#WTRPBF and LTC4368IMS-2#WTRPBF. Pin functions, electrical characteristics, and timing parameters are identical except for the reverse overcurrent threshold (–3mV vs. –50mV) and temperature grade. No PCB changes are required when substituting within the same package footprint.

What is the purpose of the RETRY pin on the LTC4368IDD-2#WTRPBF?

The RETRY pin on the LTC4368IDD-2#WTRPBF configures forward overcurrent fault recovery behavior: grounding it forces latch-off (requiring SHDN toggle to reset), while connecting it to a capacitor enables auto-retry with a user-adjustable cooldown delay (5.5ms/nF). For example, a 22nF capacitor yields ~120ms delay before automatic reconnection. This pin has no effect on reverse overcurrent recovery, which is always automatic upon VIN–VOUT ≥ 75mV.

Does the LTC4368IDD-2#WTRPBF support hot-swap functionality?

Yes, the LTC4368IDD-2#WTRPBF supports hot-swap functionality on the VIN pin, allowing safe live insertion into powered systems. Its 32ms turn-on delay debounces mechanical contact bounce and filters line noise, while the 2.2V input UVLO prevents operation until a valid supply is established. The device also blocks 50Hz/60Hz AC inputs inherently, making it suitable for universal-input hot-swap applications without additional rectification.