Analog Devices Inc. LTC4364IMS-1#PBF

Overview

LTC4364IMS-1#PBF from Analog Devices is a surge stopper with ideal diode controller designed for automotive and industrial high-reliability power rails. It protects downstream loads from 200V/1ms transients, regulates output at adjustable clamp voltage (e.g., 27V), provides reverse input protection to –40V, and drives dual N-channel MOSFETs for overvoltage/overcurrent fault management and ideal diode holdup. Used in automotive load-dump protection circuits.

For engineers reviewing the LTC4364IMS-1#PBF datasheet, LTC4364IMS-1#PBF pinout, LTC4364IMS-1#PBF application, or LTC4364IMS-1#PBF equivalent, key selection criteria include its –40°C to 85°C operating range, 16-lead MSOP package, latch-off fault behavior (LTC4364-1 variant), 4V–80V input range, and integrated TMR-based timed circuit breaker with 1.25V fault warning threshold.

Technical Context

The LTC4364IMS-1#PBF implements dual-control architecture: a voltage-regulating surge stopper loop (via HGATE) that maintains FB = 1.25V during overvoltage, and an ideal diode controller (via DGATE) that regulates V_SD to 30mV forward drop. Its fault timer (TMR pin) integrates voltage- and current-dependent charging currents-5× higher during overcurrent-to dynamically scale timeout based on MOSFET stress.

It features independent UV/OV comparators with hysteresis (25–80mV), latched-off shutdown after fault timeout (LTC4364-1 behavior), and bidirectional blocking: reverse input protection to –40V via VCC clamping, reverse output protection to –20V via DGATE fast turn-off. Shutdown current is 10μA at 12V with SHDN pulled low.

Key Specifications

Pinout & Package

Package: 16-Lead Plastic MSOP (MS package), exposed pad optional, θ_JA = 120°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar surge protection and ideal diode control applications.

Compared with LTC4365IMS-1#PBF, the LTC4364IMS-1#PBF trades cold-crank capability for tighter FB tolerance and broader AEC-Q100 validation; versus TPS26631RGER, it delivers integrated ideal diode control and dynamic fault timing but requires two external MOSFETs.

Availability

LTC4364IMS-1#PBF is available at Aetrix Electronics and suitable for automotive load-dump protection, redundant supply ORing, and industrial output port protection requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC4364IMS-1#PBF 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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision, power, and reliability-critical applications.

The LTC4364IMS-1#PBF belongs to Analog Devices' Surge Stopper family, engineered specifically for robust front-end protection in automotive, avionic, and industrial power systems where transient immunity, reverse polarity resilience, and fail-safe fault handling are mandatory.

FAQ

What is the key functional difference between LTC4364IMS-1#PBF and LTC4364IMS-2#PBF?

The LTC4364IMS-1#PBF implements latch-off fault behavior: once the TMR pin reaches 1.35V, HGATE turns off and remains latched low until manually reset via SHDN or UV pin. In contrast, LTC4364IMS-2#PBF automatically retries after a 32-cycle cool-down timer completes, provided OV is below threshold. This makes LTC4364IMS-1#PBF preferable for safety-critical systems requiring explicit operator or system intervention after fault.

How does the LTC4364IMS-1#PBF achieve reverse input protection to –40V?

The LTC4364IMS-1#PBF achieves –40V reverse input protection through internal clamping circuitry on the VCC pin. When VCC is pulled below ground (e.g., reverse battery), internal protection diodes and charge pump structures limit voltage stress without requiring external components. The datasheet confirms absolute maximum rating of –40V at VCC, and operation remains functional down to –30V with negligible reverse leakage (ICC(REV) ≤ –10μA).

Can the LTC4364IMS-1#PBF regulate output voltage to exactly 27V, and how is this set?

Yes - the LTC4364IMS-1#PBF regulates output voltage to precisely 27V using the FB pin and an external resistor divider. With a 1.25V internal reference (VFB = 1.22V to 1.28V), a standard divider (e.g., 90.9kΩ from OUT to FB, 4.99kΩ from FB to GND) sets VOUT = 1.25V × (1 + 90.9k/4.99k) ≈ 27V. The ±2.4% FB tolerance translates to ±0.65V regulation error at 27V, confirmed across –40°C to +85°C.

What is the role of the TMR pin in the LTC4364IMS-1#PBF, and how is timing determined?

The TMR pin in the LTC4364IMS-1#PBF serves as the fault timer node, charged by voltage- and current-dependent current sources. Timing is set by an external capacitor to GND: TMR reaches 1.25V (FLT warning) and 1.35V (HGATE turn-off) based on dV/dt = I_CHARGE/C_TMR. Overcurrent charging current is 5× higher than overvoltage, ensuring faster shutdown under high-power fault conditions - directly protecting the external MOSFET's safe operating area.

Does the LTC4364IMS-1#PBF require external MOSFETs, and what are the critical selection criteria?

Yes - the LTC4364IMS-1#PBF requires two external N-channel MOSFETs: one for surge stopping (HGATE-controlled) and one for ideal diode function (DGATE-controlled). Critical selection criteria include R_DS(ON) low enough to sustain load current with minimal heating, V_GS(th) compatible with 10–12V gate drive, and SOA rating sufficient for worst-case V_DS × I_D during clamping. FDB33N25 and FDB3682 are validated examples from the datasheet.