Analog Devices Inc. LTC4361IDC-1#TRPBF

Overview

LTC4361IDC-1#TRPBF 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, latchoff fault response, and reverse voltage protection-enabling robust USB and smartphone power input protection.

For engineers reviewing the LTC4361IDC-1#TRPBF datasheet, LTC4361IDC-1#TRPBF pinout, LTC4361IDC-1#TRPBF application, or LTC4361IDC-1#TRPBF equivalent, key selection criteria include its 80V absolute max input rating, –40°C to 85°C industrial temperature range, DFN (2mm × 2mm) package with exposed pad, and precise dV/dt-controlled inrush limiting for battery-powered consumer electronics.

Technical Context

The LTC4361IDC-1#TRPBF implements dual independent protection loops: a fast analog overvoltage comparator triggering GATE pull-down within 5µs, and a 10µs-glitch-filtered overcurrent comparator monitoring SENSE-to-IN differential voltage. Its gate drive architecture combines a charge pump (≥4.5V overdrive for VIN ≥3V) with programmable ramp control (3V/ms default) and internal clamping (GATE to OUT ≤6V, IN to GATEP ≤5.8V).

It features CMOS-compatible ON control with 5µA internal pull-down, open-drain PWRGD output with 500kΩ pull-up to OUT and 65µs delay after GATE exceeds VGATE(TH), and dedicated GATEP pin for optional P-channel MOSFET control enabling negative voltage protection down to –40V input.

Key Specifications

Pinout & Package

Package: 8-Lead (2mm × 2mm) Plastic DFN with exposed pad (pin 9 = GND). Thermal resistance θ_JA = 102°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPD2E001DRYR and MAX14749ETA+, the LTC4361IDC-1#TRPBF uniquely combines ultrafast (<1µs) overvoltage response, 80V transient immunity, and external MOSFET flexibility - making it optimal for ruggedized portable power inputs requiring field-proven reliability across multiple adapter types.

Availability

LTC4361IDC-1#TRPBF 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 LTC4361IDC-1#TRPBF 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, communications, and industrial markets.

The LTC4361 product line delivers high-reliability overvoltage/overcurrent protection controllers for portable electronics with multi-source power inputs, emphasizing speed, accuracy, and integration of protection functions without compromising system efficiency.

FAQ

What is the overvoltage protection threshold of the LTC4361IDC-1#TRPBF?

The LTC4361IDC-1#TRPBF has a precisely trimmed 5.8V overvoltage threshold with ±2% accuracy over temperature. This value is fixed and non-adjustable, ensuring consistent protection for 5.5V-rated downstream components. The device enters lockout when the IN pin voltage exceeds this threshold and releases only after VIN falls below 5.7V (5.8V minus 100mV hysteresis) for 130ms. This behavior is confirmed in the Electrical Characteristics table on page 3 of the official datasheet.

Does the LTC4361IDC-1#TRPBF require external TVS diodes for 80V transient protection?

No, the LTC4361IDC-1#TRPBF does not require external TVS diodes for most 80V transient protection applications. Its 85V absolute maximum input rating, combined with <1µs overvoltage turn-off and internal clamping (e.g., IN-to-GATEP ≤5.8V), allows it to absorb energy via the external MOSFET's avalanche capability. The datasheet explicitly states "No Input Capacitor or TVS Required for Most Applications" and validates this with Figure 5 and Figure 7 waveforms showing successful 20V and 50V hot-plug events.

How does the LTC4361IDC-1#TRPBF differ from the LTC4361-2 variant?

The LTC4361IDC-1#TRPBF implements latchoff behavior after overcurrent faults: once tripped, it remains off until manually reset by cycling IN below 2.1V or ON above 1.5V. In contrast, the LTC4361-2 variant auto-retries after a fixed 130ms delay. Both share identical overvoltage response, pinout, package, and temperature range (–40°C to +85°C), but the -1 suffix denotes the latched fault mode required for safety-critical or thermally sensitive applications.

What is the purpose of the GATEP pin on the LTC4361IDC-1#TRPBF?

The GATEP pin on the LTC4361IDC-1#TRPBF drives an optional external P-channel MOSFET to provide reverse polarity and negative voltage protection. Internally clamped to 5.8V below IN and pulled down by a 2MΩ resistor, GATEP automatically turns on the P-MOSFET when VIN goes negative, blocking reverse current flow. This feature enables protection against miswired or reversed DC inputs - a common failure mode in handheld devices using multiple adapter types.

Can the LTC4361IDC-1#TRPBF operate with a 2.5V input supply?

Yes, the LTC4361IDC-1#TRPBF operates across a 2.5V to 5.5V input range, fully specified down to 2.5V. At 2.5V, its gate drive maintains ≥3.5V overdrive (per Electrical Characteristics table), sufficient to fully enhance logic-level N-channel MOSFETs like the Si1470DH. Undervoltage lockout activates below 1.8V (min), ensuring clean startup and preventing erratic behavior during brownout conditions.