Analog Devices Inc. LTC4364CS-2#PBF

Overview

LTC4364CS-2#PBF from Analog Devices is a surge stopper with integrated ideal diode controller 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 features auto-retry fault recovery with 0.1% duty cycle during overvoltage. Used in 12V/24V vehicle electronics with load-dump immunity.

For engineers reviewing the LTC4364CS-2#PBF datasheet, LTC4364CS-2#PBF pinout, LTC4364CS-2#PBF application, or LTC4364CS-2#PBF equivalent, key selection criteria include its 4V–80V operating range, 10μA shutdown current, 50mV overcurrent threshold, AEC-Q100 qualification, and SO-16 package compatibility with hot-swap and redundant ORing designs.

Technical Context

The LTC4364CS-2#PBF implements dual-control architecture: a voltage-regulating surge stopper (HGATE) for overvoltage clamping and an active ideal diode controller (DGATE) for reverse polarity protection and output holdup. Its fault timer uses VCC–OUT–dependent current sourcing to dynamically scale timeout based on MOSFET stress.

Unlike the latch-off LTC4364-1 variant, the LTC4364CS-2#PBF automatically restarts after fault cooldown-32 cycles between 0.15V and 1.35V on TMR-with retry enabled only when OV pin voltage falls below 1.25V. UV detection (1.25V threshold, 50mV hysteresis) disables HGATE/DGATE during undervoltage but does not reset latched faults.

Key Specifications

Pinout & Package

Package: 16-Lead Plastic SO (Small Outline), RoHS-compliant, 0°C to 70°C ambient operating range. Exposed pad not present in SO package.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC4364IMS-2#PBF, the LTC4364CS-2#PBF offers lower assembly cost and higher mechanical robustness in SO packaging but slightly higher thermal resistance; versus TPS26631RGER, it delivers full dual-MOSFET control for combined surge suppression and reverse-polarity holdup - a capability absent in monolithic eFuses.

Availability

LTC4364CS-2#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC power rails, and avionics subsystems requiring stable component supply with AEC-Q100 compliance, long-term lifecycle support, and traceable sourcing.

Supply support for LTC4364CS-2#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, communications, and automotive markets since 1965.

The LTC4364CS-2#PBF belongs to Analog Devices' Surge Stopper® family, engineered specifically for high-availability power systems where load protection during transients, reverse polarity, and brownout must be guaranteed without microcontroller intervention.

FAQ

What is the key functional difference between LTC4364CS-2#PBF and LTC4364CS-1#PBF?

The LTC4364CS-2#PBF implements auto-retry fault recovery: after overvoltage or overcurrent timeout, it cycles the TMR pin 32 times between 0.15V and 1.35V and then automatically re-enables HGATE if the OV pin voltage is below 1.25V. In contrast, the LTC4364CS-1#PBF latches HGATE off permanently until SHDN or UV is actively pulsed - making LTC4364CS-2#PBF ideal for unattended systems where manual reset is impractical.

Can LTC4364CS-2#PBF operate with a 3.3V input supply?

No. The LTC4364CS-2#PBF has a minimum operating supply voltage of 4V, as specified in its Absolute Maximum Ratings and Electrical Characteristics tables. At 3.3V, internal charge pumps cannot generate sufficient gate drive for the external N-MOSFETs, and regulation loops will not engage. For sub-4V applications, consider alternative surge protection architectures or pre-regulation stages.

How is the output clamp voltage set on LTC4364CS-2#PBF?

The output clamp voltage is set by connecting a resistive divider from the OUT pin to GND, with the junction tied to the FB pin. The LTC4364CS-2#PBF regulates the FB pin to 1.25V (±2.4%), so V_CLAMP = 1.25V × (1 + R1/R2), where R1 is the upper resistor (OUT to FB) and R2 is the lower resistor (FB to GND). Example: 4.99kΩ and 10kΩ yields ~27V clamp, matching the typical application.

Does LTC4364CS-2#PBF require external components for basic surge protection operation?

Yes. The LTC4364CS-2#PBF requires at minimum: two external N-channel MOSFETs (one for surge stopper, one for ideal diode), a TMR capacitor (e.g., 6.8µF) for fault timing, an FB divider for clamp voltage setting, and bypass capacitors on OUT and VCC. The typical application shows 22µF on OUT and 6.8nF on HGATE - omitting these compromises stability, fault response, and regulation accuracy.

Is LTC4364CS-2#PBF pin-compatible with other LTC4364 variants in SO-16 package?

Yes. All LTC4364-xS-y#PBF variants (e.g., LTC4364CS-1#PBF, LTC4364IS-2#PBF) share identical SO-16 pinout, electrical behavior, and footprint. Only temperature grade (C/I/H) and fault behavior (-1/-2) differ - allowing drop-in replacement for qualification reuse, provided system-level timing and thermal validation align with the new variant's specifications.