Analog Devices Inc. LTC4361CDC-1#TRMPBF

Overview

LTC4361CDC-1#TRMPBF from Analog Devices is an overvoltage/overcurrent protection controller designed to safeguard 2.5V–5.5V portable systems against input transients up to 80V. It controls an external N-channel MOSFET, features a 5.8V ±2% overvoltage threshold, 50mV ±10% overcurrent trip, and <1µs overvoltage turn-off-used in USB-powered handheld devices requiring robust hot-plug resilience.

For engineers reviewing the LTC4361CDC-1#TRMPBF datasheet, LTC4361CDC-1#TRMPBF pinout, LTC4361CDC-1#TRMPBF application, or LTC4361CDC-1#TRMPBF equivalent, key selection criteria include latchoff behavior after overcurrent, DFN (2mm × 2mm) package compatibility, GATE drive capability for logic-level N-MOSFETs, and integrated reverse voltage protection via GATEP.

Technical Context

The LTC4361CDC-1#TRMPBF implements dual independent protection loops: a fast overvoltage comparator with 25–300mV hysteresis triggers GATE pull-down within 5µs, while a 10µs-glitch-filtered overcurrent circuit monitors SENSE–IN differential voltage. Its internal charge pump delivers ≥4.5V gate drive above OUT for VIN ≥3V, enabling low-R_DS(ON) N-MOSFETs without external boost.

Startup includes a 130ms delay before GATE ramp-up at 3V/ms, limiting inrush current into output capacitance; ON pin enables CMOS-compatible active-low control with 5µA internal pull-down. The device latches off permanently after overcurrent (LTC4361-1 variant), requiring UVLO or ON reset-distinguishing it from auto-retry LTC4361-2 variants.

Key Specifications

Pinout & Package

Package: 8-Lead (2mm × 2mm) Plastic DFN with exposed thermal pad (Pin 9, GND). Pin 1 marked by notch; top-view pin order: ON (1), OUT (2), GATEP (3), GND (4), IN (5), SENSE (6), GATE (7), PWRGD (8).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC4361CTS8-1#TRMPBF and TPD3S014TDR, the LTC4361CDC-1#TRMPBF offers superior thermal performance in compact form factor and unique latchoff behavior critical for fault containment in battery-powered systems-making it optimal for designs requiring fail-safe shutdown and field-replaceable power inputs.

Availability

LTC4361CDC-1#TRMPBF is available at Aetrix Electronics and suitable for USB protection, handheld computers, and cell/smart phones requiring stable component supply with guaranteed long-term sourcing.

Supply support for LTC4361CDC-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and consumer markets.

The LTC4361 family is designed for robust front-end power protection in portable electronics, addressing the need for single-chip solutions that replace discrete TVS, fuses, and MOSFET drivers in space- and reliability-critical applications.

FAQ

What is the overvoltage protection threshold of the LTC4361CDC-1#TRMPBF?

The LTC4361CDC-1#TRMPBF has a precisely trimmed 5.8V ±2% overvoltage threshold on the IN pin. This means it reliably disables the external N-MOSFET when input voltage exceeds 5.916V and re-enables only after VIN falls below 5.51V (recovery threshold), providing stable hysteresis. This specification is validated across the 0°C to 70°C operating range and is critical for protecting 5V systems from accidental 12V or 20V adapter misconnections.

Does the LTC4361CDC-1#TRMPBF support reverse voltage protection?

Yes, the LTC4361CDC-1#TRMPBF supports reverse voltage protection via its GATEP pin, which drives an optional external P-channel MOSFET. GATEP is internally clamped to 5.8V below VIN and includes a 2MΩ pull-down to GND. When a negative voltage appears at IN, the GATEP-controlled P-MOSFET blocks reverse current flow, protecting downstream 2.5V–5.5V circuitry from damage due to incorrect polarity connections.

How does the LTC4361CDC-1#TRMPBF differ from the LTC4361-2 variant?

The LTC4361CDC-1#TRMPBF implements latchoff behavior after overcurrent faults: once tripped, it remains off until manually reset by cycling IN below 2.1V or driving ON above 1.5V. In contrast, the LTC4361-2 variant automatically retries after a fixed 130ms delay. This makes the LTC4361CDC-1#TRMPBF ideal for safety-critical or thermally constrained applications where uncontrolled restart into persistent faults must be avoided.

What package type is used for the LTC4361CDC-1#TRMPBF?

The LTC4361CDC-1#TRMPBF uses an 8-Lead (2mm × 2mm) Plastic DFN package with exposed thermal pad (Pin 9, GND). This compact, low-profile package provides superior thermal performance (θ_JA = 102°C/W) compared to the TSOT-23 variant and is optimized for high-density portable PCBs where space and heat dissipation are critical design factors.

Can the LTC4361CDC-1#TRMPBF drive logic-level N-channel MOSFETs?

Yes, the LTC4361CDC-1#TRMPBF can directly drive logic-level N-channel MOSFETs. Its GATE driver delivers ≥4.5V above the OUT pin voltage for VIN ≥3V, ensuring full enhancement of MOSFETs with V_GS(th) ≤3V. The internal charge pump and 30mA fast pull-down capability allow reliable switching of low-R_DS(ON) devices like the Si1470DH, minimizing conduction losses in portable power paths.