Analog Devices Inc. LTC4361IDC-1#TRMPBF

Overview

LTC4361IDC-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, delivers 2% accurate 5.8V overvoltage threshold, 10% accurate 50mV overcurrent trip, and achieves <1µs overvoltage turn-off with gentle shutdown-used in USB-powered handheld devices requiring robust front-end power rail protection.

For engineers reviewing the LTC4361IDC-1#TRMPBF datasheet, LTC4361IDC-1#TRMPBF pinout, LTC4361IDC-1#TRMPBF application, or LTC4361IDC-1#TRMPBF equivalent, key selection criteria include latchoff behavior after overcurrent, –40°C to 85°C industrial temperature rating, DFN (2mm × 2mm) package with exposed pad, and compatibility with logic-level N-MOSFETs for low R_DS(ON) efficiency.

Technical Context

The LTC4361IDC-1#TRMPBF implements dual independent protection loops: a fast overvoltage comparator (5.8V threshold, 25–300mV hysteresis) triggering ≤1µs GATE pull-down, and an overcurrent circuit breaker (50mV ±5mV trip, 10µs glitch filter) that latches off permanently until reset via IN undervoltage or ON high pulse. Its charge-pump-based GATE driver delivers ≥4.5V gate overdrive above OUT for reliable N-MOSFET turn-on across 3V–5.5V input range.

It integrates adjustable dV/dt-controlled soft-start (130ms delay + 3V/ms ramp), reverse voltage protection via GATEP-driven P-MOSFET, and open-drain PWRGD output asserting low 65ms after GATE exceeds VGATE(TH). The device operates with no input capacitor or TVS required in most applications due to 80V absolute maximum IN rating and internal clamping.

Key Specifications

Pinout & Package

Package: 8-Lead (2mm × 2mm) Plastic DFN with exposed thermal pad (pin 9, connected to GND). Optimized for thermal performance (θ_JA = 102°C/W) and space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPD3S014RTER and MAX14523ATA+, the LTC4361IDC-1#TRMPBF provides full overvoltage *and* overcurrent protection with latchoff behavior, –40°C to 85°C rating, and support for external MOSFET optimization-making it suitable for ruggedized portable designs where reliability and design flexibility are critical.

Availability

LTC4361IDC-1#TRMPBF is available at Aetrix Electronics and suitable for USB protection, smartphone charging circuits, and digital camera power management requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for LTC4361IDC-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. 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 part of Analog Devices' power protection portfolio, engineered specifically for portable electronics with multi-source power inputs and stringent voltage tolerance requirements.

FAQ

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

The LTC4361IDC-1#TRMPBF features a 2% accurate overvoltage threshold of 5.8V (5.684V to 5.916V) on the IN pin. This precision allows reliable protection of 5.5V-rated downstream ICs without unnecessary derating. The device holds GATE low within <1µs when IN exceeds this threshold, and requires VIN to fall below 5.7V (VIN(OV) – ∆VOV) for 130ms before restarting. This behavior is confirmed in the Electrical Characteristics table and Operation section of the official datasheet.

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

The LTC4361IDC-1#TRMPBF implements latchoff behavior after an overcurrent event: GATE remains off until manually reset by pulling IN below 2.1V or ON above 1.5V for >500µs. In contrast, the LTC4361-2 variant automatically retries after a 130ms delay. This distinction is explicitly defined in the FEATURES list and OPERATION section, and is encoded in the "-1" suffix of the LTC4361IDC-1#TRMPBF part number.

Does the LTC4361IDC-1#TRMPBF require external components for basic overvoltage protection?

No, the LTC4361IDC-1#TRMPBF does not require external TVS diodes or input capacitors for most applications. Its 80V absolute maximum IN rating, internal 5.8V overvoltage comparator, and fast GATE turn-off (<1µs) enable direct connection to wall adaptors and car chargers. The datasheet states "No Input Capacitor or TVS Required for Most Applications" and validates this with test waveforms (Figures 4–9) showing successful 20V/50V hot-plug suppression using only the IC and external N-MOSFET.

What package type and thermal characteristics does the LTC4361IDC-1#TRMPBF use?

The LTC4361IDC-1#TRMPBF uses an 8-Lead (2mm × 2mm) Plastic DFN package with exposed thermal pad (pin 9, GND). Its thermal resistance is θ_JA = 102°C/W under standard JEDEC conditions. The package drawing (DC8) and thermal data are specified in the PACKAGE DESCRIPTION section (pages 13–14), confirming mechanical compatibility with 0.4mm pitch layouts and requirement for exposed pad soldering to PCB ground for optimal thermal performance.

Can the LTC4361IDC-1#TRMPBF support reverse voltage protection?

Yes, the LTC4361IDC-1#TRMPBF supports reverse voltage protection via its GATEP pin, which drives an optional external P-channel MOSFET. The GATEP pin includes a 2MΩ internal pull-down and a 5.8V Zener clamp referenced to IN, enabling safe V_GS control for negative input voltages down to –80V. This functionality is detailed in the PIN FUNCTIONS section (page 5) and illustrated in Figure 3 (MOSFET Configurations) and Figure 6 (50V Hot-Plug).