Analog Devices Inc. LTC4364IS-2#TRPBF

Overview

LTC4364IS-2#TRPBF from Analog Devices is a surge stopper with ideal diode controller in 16-lead SO package, designed for automotive-grade overvoltage/undervoltage protection and reverse input/output protection. It regulates output at adjustable clamp voltage (e.g., 27V), withstands 200V/1ms transients, provides 0.1% retry duty cycle during faults, and supports 4V–80V input range with –40V reverse input tolerance.

For engineers reviewing the LTC4364IS-2#TRPBF datasheet, LTC4364IS-2#TRPBF pinout, LTC4364IS-2#TRPBF application, or LTC4364IS-2#TRPBF equivalent, this page delivers verified functional context, validated pin roles, confirmed automotive AEC-Q100 qualification, and real-world surge protection design parameters - all specific to the LTC4364IS-2 variant in SO package.

Technical Context

The LTC4364IS-2#TRPBF implements dual-loop protection: a voltage amplifier regulates HGATE to clamp VOUT via external FB divider during overvoltage, while an active current limit circuit controls SENSE–OUT differential to 50mV (or 25mV during output short). Its fault timer uses TMR capacitor charging proportional to (VCC − VOUT) to enforce SOA-safe turn-off timing.

Unlike the latch-off LTC4364-1, the LTC4364IS-2#TRPBF features auto-retry: after fault timeout, it executes a 32-cycle cool-down (TMR cycling between 0.15V and 1.35V) and re-enables HGATE only if OV pin voltage falls below 1.25V - enabling recovery without manual reset in transient-overvoltage scenarios.

Key Specifications

Pinout & Package

Package: 16-lead plastic SO (Small Outline), 0.300" wide, exposed pad optional, TJMAX = 150°C, θJA = 100°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC4364IS-2#TRPBF, LTC4365IS-2#TRPBF integrates the MOSFET drivers but sacrifices independent ideal diode tuning, while TPS26631RGER offers lower system cost at the expense of missing reverse protection and adjustable clamp voltage - making LTC4364IS-2#TRPBF optimal for automotive and avionic designs requiring full dual-path control.

Availability

LTC4364IS-2#TRPBF is available at Aetrix Electronics and suitable for automotive ECU protection, industrial redundant power ORing, and avionic power conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC4364IS-2#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 industrial, automotive, communications, and aerospace markets since 1965.

The LTC4364IS-2#TRPBF belongs to Analog Devices' Surge Stopper® family, engineered specifically for robust, self-protecting power path management in harsh environments - emphasizing fail-safe behavior, SOA-aware fault timing, and AEC-Q100 compliance.

FAQ

What is the key functional difference between LTC4364IS-2#TRPBF and LTC4364IS-1#TRPBF?

The LTC4364IS-2#TRPBF implements auto-retry fault recovery: after overvoltage or overcurrent timeout, it executes a 32-cycle TMR cool-down and re-enables HGATE if OV < 1.25V. In contrast, LTC4364IS-1#TRPBF latches HGATE off permanently until SHDN or UV is pulsed. This makes LTC4364IS-2#TRPBF ideal for systems requiring autonomous recovery from transient surges without microcontroller intervention.

How does LTC4364IS-2#TRPBF achieve reverse input protection to –40V?

LTC4364IS-2#TRPBF achieves –40V reverse input protection through absolute maximum rating compliance on the VCC pin and internal clamping architecture: when VCC drops below GND, both DGATE and HGATE are pulled to the SOURCE pin voltage, turning off the external N-MOSFETs and blocking conduction. No external components are needed beyond the MOSFETs themselves - the IC's internal charge pumps and level shifters remain functional down to –40V on VCC.

Can LTC4364IS-2#TRPBF regulate output voltage to exactly 27V, and how is that set?

Yes, LTC4364IS-2#TRPBF regulates output to precisely 27V using its FB pin and internal 1.25V reference. A resistor divider from OUT to GND sets the clamp voltage: VCLAMP = 1.25V × (1 + R1/R2). For 27V, use R1 = 383kΩ and R2 = 10kΩ (as shown in Figure 1 of the datasheet), achieving ±2.4% accuracy over temperature and line - sufficient for automotive 27V rail compliance.

What is the purpose of the TMR pin on LTC4364IS-2#TRPBF, and how is its capacitor value selected?

The TMR pin on LTC4364IS-2#TRPBF sets fault timing via an external capacitor to ground. Its value determines warning delay (TMR = 1.25V), turn-off delay (TMR = 1.35V), and cool-down period (32 cycles between 0.15V and 1.35V). For a 6.8µF capacitor (typical), the overvoltage timeout is ~50ms at 92V input - scaling inversely with (VCC − VOUT). Select based on MOSFET SOA curves and required fault response time per IEC/ISO standards.

Is LTC4364IS-2#TRPBF pin-compatible with other package variants like LTC4364IDE-2#TRPBF?

No, LTC4364IS-2#TRPBF (16-lead SO) is not pin-compatible with LTC4364IDE-2#TRPBF (14-lead DFN) or LTC4364IMS-2#TRPBF (16-lead MSOP). While all share identical electrical functionality and pin numbering logic, the SO package has NC pins at positions 3 and 7, whereas DFN omits those entirely and MSOP relocates them. PCB layout must match the specific package - no mechanical or routing interchangeability exists.