Analog Devices Inc. LTC4361CDC-2#TRMPBF

Overview

LTC4361CDC-2#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 5.8V ±2% overvoltage threshold, 50mV ±10% overcurrent trip, <1µs overvoltage turn-off, and auto-retry recovery after overcurrent faults - enabling robust USB and smartphone power input protection.

For engineers reviewing the LTC4361CDC-2#TRMPBF datasheet, LTC4361CDC-2#TRMPBF pinout, LTC4361CDC-2#TRMPBF application, or LTC4361CDC-2#TRMPBF equivalent, key selection criteria include its 80V absolute max input rating, DFN (2mm × 2mm) package with exposed pad, GATE/GATEP dual-MOSFET drive capability, and auto-retry vs latchoff behavior distinguishing it from LTC4361-1 variants.

Technical Context

The LTC4361CDC-2#TRMPBF implements dual-comparator protection logic: a precision 5.8V overvoltage comparator with 25–300mV hysteresis and a 50mV overcurrent comparator with 10µs glitch filter. Its internal charge pump ensures ≥4.5V gate drive for logic-level N-MOSFETs when VIN ≥3V, while GATEP provides clamped drive for optional P-MOSFET reverse-voltage protection.

Startup includes a 130ms delay before controlled GATE ramp-up at 3V/ms, limiting inrush current; after overcurrent, LTC4361CDC-2#TRMPBF automatically retries after 130ms, unlike latchoff LTC4361-1 versions. PWRGD asserts low 65ms after GATE exceeds VGATE(TH), providing sequenced power-good signaling.

Key Specifications

Pinout & Package

Package: 8-Lead (2mm × 2mm) Plastic DFN with exposed thermal pad (pin 9, GND). RoHS-compliant, lead-free finish (#TRMPBF).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC4361CTS8-2#TRMPBF, LTC4361CDC-2#TRMPBF offers superior thermal performance in compact form factor; compared with TPD3S014TDR, it provides field-programmable OV/OCP thresholds, external MOSFET flexibility, and 80V transient handling - essential for multi-adapter portable systems.

Availability

LTC4361CDC-2#TRMPBF is available at Aetrix Electronics and suitable for USB protection, smartphone power input, MP3/MP4 player power management, and digital camera input protection requiring stable component supply across industrial and consumer production cycles.

Supply support for LTC4361CDC-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. (ADI) 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 was engineered for portable electronics with multiple power sources - delivering integrated overvoltage/overcurrent protection, MOSFET gate drive, and power-good signaling in minimal footprint packages.

FAQ

What is the key functional difference between LTC4361CDC-2#TRMPBF and LTC4361CDC-1#TRMPBF?

The LTC4361CDC-2#TRMPBF implements auto-retry recovery after overcurrent faults, restarting after a fixed 130ms delay. In contrast, LTC4361CDC-1#TRMPBF latches off permanently until reset by cycling IN below 2.1V or ON above 1.5V. This makes LTC4361CDC-2#TRMPBF ideal for consumer devices where unattended fault recovery is required, while LTC4361CDC-1#TRMPBF suits safety-critical systems needing manual intervention.

Does LTC4361CDC-2#TRMPBF require an external TVS diode for 80V transient protection?

No - the LTC4361CDC-2#TRMPBF's IN pin is rated for –0.3V to 85V absolute maximum voltage and incorporates internal circuitry that absorbs inductive cable transients up to 80V without external TVS components in most applications. Its <1µs overvoltage turn-off and MOSFET avalanche energy handling eliminate the need for TVS diodes in standard USB and portable device designs.

How does the GATE ramp rate affect inrush current in LTC4361CDC-2#TRMPBF designs?

The LTC4361CDC-2#TRMPBF ramps GATE at 3V/ms by default, resulting in inrush current I_INRUSH = C_OUT × 3 mA/µF. For example, with 100µF output capacitance, peak inrush is ~300mA. An external capacitor from GATE to GND slows ramp rate further: slope = 10µA / C_G, enabling precise inrush control for sensitive loads like audio codecs or image sensors.

Can LTC4361CDC-2#TRMPBF protect against negative input voltage?

Yes - when used with an external P-channel MOSFET connected to GATEP, the LTC4361CDC-2#TRMPBF provides reverse-polarity protection. GATEP is internally clamped to 5.8V below VIN and features a 2MΩ pull-down, enabling automatic turn-on of the P-MOSFET when negative voltage appears at IN. This blocks reverse current and protects downstream circuitry from –20V or lower inputs.

What is the purpose of the PWRGD pin on LTC4361CDC-2#TRMPBF and how is it configured?

The PWRGD pin on LTC4361CDC-2#TRMPBF is an open-drain power-good output that pulls low 65ms after GATE voltage exceeds VGATE(TH), confirming stable output voltage. It features a 500kΩ internal resistive pull-up to OUT, allowing direct connection to 3.3V or 5V rails via external pull-up if needed. PWRGD releases during UVLO, overvoltage, overcurrent, or ON-high sleep mode - providing accurate sequencing feedback to host processors or PMICs.