Analog Devices Inc. LTC4361HTS8-2#TRMPBF

Overview

LTC4361HTS8-2#TRMPBF from Analog Devices is an overvoltage/overcurrent protection controller that safeguards 2.5V–5.5V systems using an external N-channel MOSFET. It delivers 2% accurate 5.8V overvoltage threshold, 10% accurate 50mV overcurrent trip, <1µs overvoltage turn-off, and auto-retry after overcurrent faults. It is deployed in USB-powered portable devices such as smartphones and digital cameras to prevent damage from wall adaptors, car chargers, or hot-plug transients.

For engineers reviewing the LTC4361HTS8-2#TRMPBF datasheet, LTC4361HTS8-2#TRMPBF pinout, LTC4361HTS8-2#TRMPBF application, or LTC4361HTS8-2#TRMPBF equivalent, key selection criteria include its –40°C to 125°C operating range, TSOT-23-8 package, auto-retry (not latchoff) behavior, GATE/GATEP dual-MOSFET drive capability, and absence of required input TVS for ≤80V transients.

Technical Context

The LTC4361HTS8-2#TRMPBF implements a fast-acting protection loop with independent overvoltage and overcurrent comparators. Its overvoltage comparator triggers within 1µs when VIN exceeds 5.8V, pulling GATE low via a 30mA fast pull-down; recovery requires VIN to fall below 5.7V for 130ms before restart. The overcurrent circuit monitors voltage across an external sense resistor and trips on ≥50mV for >10µs, initiating auto-retry after a fixed 130ms delay-distinct from the latchoff behavior of the LTC4361-1 variant.

It integrates a charge pump gate driver delivering ≥4.5V overdrive for logic-level N-MOSFETs, a 3V/ms GATE ramp for inrush control, and a dedicated GATEP output with 2MΩ pull-down and 5.8V Zener clamp to drive an optional P-channel MOSFET for reverse-voltage protection. Power good status is signaled by open-drain PWRGD, asserted low 65ms after GATE exceeds its threshold voltage relative to OUT.

Key Specifications

Pinout & Package

Package: 8-Lead Plastic TSOT-23 (ThinSOT™), 3mm × 3mm footprint, exposed pad optional for thermal enhancement.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC4361ITS8-2#TRMPBF, the LTC4361HTS8-2#TRMPBF extends operational reliability to 125°C junction temperature, critical for automotive accessory or enclosed industrial designs; versus TPD2S701DR, it provides programmable overcurrent response and external MOSFET flexibility essential for high-current (>1.5A) or non-USB power paths.

Availability

LTC4361HTS8-2#TRMPBF is available at Aetrix Electronics and suitable for USB protection, smartphone power input, digital camera power management, and handheld computer system protection requiring stable component supply across extended temperature ranges.

Supply support for LTC4361HTS8-2#TRMPBF 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, Inc. 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 LTC4361 product line delivers robust front-end protection for low-voltage portable electronics, designed specifically to replace discrete TVS + MOSFET solutions with integrated control, timing, and fault-handling intelligence.

FAQ

What is the overvoltage protection threshold of the LTC4361HTS8-2#TRMPBF?

The LTC4361HTS8-2#TRMPBF features a precisely trimmed 5.8V overvoltage threshold with ±2% accuracy across its –40°C to 125°C operating range. This threshold is referenced to the IN pin and triggers immediate GATE turn-off when exceeded, isolating downstream circuitry from hazardous input voltages. Recovery requires VIN to fall below 5.7V for 130ms before automatic restart.

How does the LTC4361HTS8-2#TRMPBF differ from the LTC4361-1 version?

The LTC4361HTS8-2#TRMPBF implements auto-retry behavior after overcurrent faults, restarting automatically after a fixed 130ms delay. In contrast, the LTC4361-1 latches off permanently until reset by cycling IN below 2.1V or ON above 1.5V. Both share identical overvoltage response, pinout, and temperature rating, but their fault recovery strategies are fundamentally different.

Can the LTC4361HTS8-2#TRMPBF drive both N-channel and P-channel MOSFETs simultaneously?

Yes, the LTC4361HTS8-2#TRMPBF provides two independent gate drivers: GATE for external N-channel MOSFETs and GATEP for optional external P-channel MOSFETs. GATEP includes a 2MΩ internal pull-down and 5.8V Zener clamp to IN, enabling coordinated control for full bidirectional protection including reverse-voltage immunity.

What is the purpose of the PWRGD pin on the LTC4361HTS8-2#TRMPBF?

The PWRGD pin on the LTC4361HTS8-2#TRMPBF is an open-drain power-good output that pulls low 65ms after the GATE voltage exceeds its threshold relative to the OUT pin. It signals stable output conditions to downstream controllers or sequencers and can sink up to 3mA, supporting direct LED indication or interface with 3.3V/5V logic rails via external pull-up.

Does the LTC4361HTS8-2#TRMPBF require external components for basic overvoltage protection?

No, the LTC4361HTS8-2#TRMPBF achieves robust overvoltage protection up to 80V without requiring external TVS diodes or input capacitors in most applications. Its fast 1µs turn-off, internal clamps, and ability to absorb inductive cable energy via the external MOSFET eliminate the need for additional transient suppression components in typical portable device configurations.