Analog Devices Inc. LTC4361ITS8-1#TRMPBF

Overview

LTC4361ITS8-1#TRMPBF from Analog Devices is an overvoltage/overcurrent protection controller designed to safeguard 2.5V–5.5V portable systems using external N-channel MOSFETs. It delivers 2% accurate 5.8V overvoltage threshold, 10% accurate 50mV overcurrent trip, <1µs overvoltage turn-off, and latchoff behavior after overcurrent faults-enabling robust USB and smartphone power input protection.

For engineers reviewing the LTC4361ITS8-1#TRMPBF datasheet, LTC4361ITS8-1#TRMPBF pinout, LTC4361ITS8-1#TRMPBF application, or LTC4361ITS8-1#TRMPBF equivalent, key selection criteria include its –40°C to 85°C industrial temperature range, TSOT-23-8 package, 130ms startup delay, GATE drive capability for logic-level MOSFETs, and integrated reverse voltage protection via GATEP.

Technical Context

The LTC4361ITS8-1#TRMPBF implements dual independent protection loops: a fast overvoltage comparator (5.8V threshold with 25–300mV hysteresis) triggering ≤10µs GATE pull-down, and an overcurrent comparator monitoring SENSE–IN differential voltage (50mV ±5mV) with 10µs glitch filter. Its internal charge pump ensures ≥4.5V gate drive above OUT for VIN ≥3V, enabling low-R_DS(ON) N-MOSFET control without external boost.

Startup sequencing is managed by a 130ms delay timer that resets on any VIN <2.1V or >5.7V event; upon completion, GATE ramps at 3V/ms to limit inrush. The ON pin provides CMOS-compatible enable/disable with 5µA internal pull-down and soft shutdown, while PWRGD asserts low 65ms after GATE exceeds VGATE(TH), confirming stable output.

Key Specifications

Pinout & Package

8-Lead Plastic TSOT-23 package (JEDEC MO-193 compatible), 2.9mm × 1.6mm × 0.85mm body, exposed pad (GND-connected, optional PCB soldering).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPD3S014RTER and MAX14748ETA+T, the LTC4361ITS8-1#TRMPBF offers superior transient immunity (80V vs. ≤20V), programmable protection thresholds via external components, and true latchoff recovery-making it suitable for ruggedized portable designs where reliability trumps integration density.

Availability

LTC4361ITS8-1#TRMPBF is available at Aetrix Electronics and suitable for USB protection, smartphone power input, digital camera power management, and MP3/MP4 player input protection requiring stable component supply across industrial temperature ranges.

Supply support for LTC4361ITS8-1#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors for precision instrumentation, industrial automation, and communications infrastructure.

The LTC4361 product line delivers highly integrated overvoltage/overcurrent protection controllers targeting portable electronics with multiple power sources-designed to replace discrete TVS + MOSFET solutions while improving accuracy, speed, and thermal efficiency.

FAQ

What is the overvoltage protection threshold of the LTC4361ITS8-1#TRMPBF?

The LTC4361ITS8-1#TRMPBF features a precisely trimmed 5.8V overvoltage threshold at the IN pin with ±2% accuracy over –40°C to 85°C. This threshold is referenced internally and does not require external resistors. When VIN exceeds 5.8V, the device pulls GATE low within 10µs to disconnect the load, providing critical protection for 5V systems exposed to higher-voltage adapters or transients.

How does the LTC4361ITS8-1#TRMPBF differ from the LTC4361-2 variant?

The LTC4361ITS8-1#TRMPBF implements latchoff behavior after an overcurrent fault: GATE remains off until manually reset by cycling IN below 2.1V or ON above 1.5V. In contrast, the LTC4361-2 variant automatically retries after a 130ms delay. Both share identical overvoltage response, pinout, and temperature rating, but the -1 suffix denotes the latched fault mode essential for safety-critical or failure-sensitive applications.

Can the LTC4361ITS8-1#TRMPBF protect against negative input voltages?

Yes-the LTC4361ITS8-1#TRMPBF provides reverse voltage protection via its GATEP pin, which drives an external P-channel MOSFET. GATEP is internally clamped to VIN–5.8V and includes a 2MΩ pull-down to GND. When a negative voltage appears at IN, the P-MOSFET turns on to block reverse current flow, protecting downstream circuitry from damage due to incorrect polarity connections or battery backup scenarios.

What is the purpose of the PWRGD pin on the LTC4361ITS8-1#TRMPBF?

The PWRGD pin on the LTC4361ITS8-1#TRMPBF is an open-drain power-good indicator that pulls low 65ms after GATE voltage exceeds VGATE(TH), confirming stable output conditions. It features a 500kΩ internal pull-up to OUT and can sink up to 3mA, allowing direct connection to LEDs or microcontroller GPIOs for system-level power sequencing and fault reporting without additional components.

Does the LTC4361ITS8-1#TRMPBF require an external capacitor on the GATE pin?

No external capacitor is required on the GATE pin of the LTC4361ITS8-1#TRMPBF-the internal circuitry provides a controlled 3V/ms ramp rate during startup to limit inrush current. However, an external capacitor from GATE to GND may be added to further reduce the slew rate (to ~10µA/C_G V/s) for ultra-low inrush applications. The default ramp ensures safe charging of typical 10–100µF output capacitors without oscillation or overshoot.