Analog Devices Inc. LTC6090IFE-5#PBF

Overview

LTC6090IFE-5#PBF from Analog Devices (formerly Linear Technology) is a high-voltage, precision operational amplifier optimized for noise gain ≥5 configurations. It delivers ±70V output swing, 12MHz gain-bandwidth product, 21V/µs slew rate, and 50pA max input bias current - enabling high-impedance piezo driver and photodiode amplifier applications requiring rail-to-rail output and thermal fault management.

For engineers reviewing the LTC6090IFE-5#PBF datasheet, LTC6090IFE-5#PBF pinout, LTC6090IFE-5#PBF application, or LTC6090IFE-5#PBF equivalent, key selection criteria include guaranteed stability at noise gain ≥5, TFLAG thermal warning output, OD-controlled output disable, ±4.75V to ±70V supply range, and TSSOP-16E thermally enhanced package with guard pins.

Technical Context

The LTC6090IFE-5#PBF implements a proprietary CMOS input stage with picoampere bias current and integrated die temperature sensing. Its internal architecture includes a dedicated thermal flag circuit triggering at 145°C with 5°C hysteresis, plus an active-low output disable path referenced to the COM pin.

It features dual protection schemes: input ESD clamping with back-to-back diodes and Zener snapback above 12V differential, and output stage disable via OD pin sinking <1µA when pulled ≤0.65V below COM. The COM pin serves as a low-voltage logic reference, floating at ~30% of mid-supply if unconnected.

Key Specifications

Pinout & Package

Package: 16-lead plastic TSSOP with exposed pad (Pin 17), rated for –40°C to +85°C operating junction temperature. Exposed pad must be soldered to PCB V– plane for θJC = 10°C/W thermal performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage op-amp applications.

Compared with LT1490AIS8#PBF and OPA454AIDDA, the LTC6090IFE-5#PBF uniquely combines ±70V operation, 50pA input bias, TFLAG/OD fault management, and TSSOP-16E guard pin architecture - making it irreplaceable for precision, high-voltage, thermally monitored sensor interfaces.

Availability

LTC6090IFE-5#PBF is available at Aetrix Electronics and suitable for piezo drivers, photodiode amplifiers, high-voltage DAC buffers, optical networking bias supplies, and ATE systems requiring stable component supply across extended temperature ranges.

Supply support for LTC6090IFE-5#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 acquired Linear Technology in 2017 and maintains its legacy of high-performance analog ICs, particularly in precision amplifiers, voltage references, and power management.

The LTC6090IFE-5#PBF belongs to Linear's high-voltage precision op-amp family, designed specifically for applications demanding rail-to-rail output, picoampere input bias, and robust thermal protection in ±70V systems.

FAQ

What is the minimum noise gain required for stable operation of the LTC6090IFE-5#PBF?

The LTC6090IFE-5#PBF is specified for stable operation at noise gain ≥5. Unlike the unity-gain-stable LTC6090, this variant requires minimum noise gain of 5 to maintain ≥60° phase margin into 10kΩ//50pF loads. Attempting unity-gain configurations may cause oscillation or degraded settling behavior. Always verify stability with actual layout parasitics using the recommended compensation guidelines in the datasheet.

How does the TFLAG pin function on the LTC6090IFE-5#PBF, and can it be used to automatically disable the output?

The TFLAG pin on the LTC6090IFE-5#PBF is an open-drain output that actively sinks ~200µA when die temperature exceeds 145°C. Yes - it can be directly tied to the OD pin (with optional 10kΩ pull-up to COM) to achieve automatic thermal output disable. When TFLAG pulls OD low, the output stage shuts down while input bias remains active, reducing quiescent current to ~580µA. This configuration ensures safe operation before reaching the 175°C hard shutdown threshold.

What is the role of the COM pin on the LTC6090IFE-5#PBF, and what happens if it is left unconnected?

The COM pin on the LTC6090IFE-5#PBF establishes a local 0V reference for OD and TFLAG logic-level interfacing. If left unconnected, an internal resistive divider pulls COM to ~30% of the mid-supply voltage (e.g., ~21V with ±70V supplies). This violates the –3V to +7V absolute maximum rating relative to OD/TFLAG, risking latch-up or damage. Always tie COM to system ground or a defined low-voltage reference - never leave it floating.

Does the LTC6090IFE-5#PBF support single-supply operation, and what is the valid input common-mode range?

Yes, the LTC6090IFE-5#PBF supports single-supply operation up to +140V (V+ to V–). Its input common-mode range is specified as V– + 3V to V+ – 3V - meaning with a +140V single supply (V– = 0V), inputs must stay within 3V to 137V. This excludes true rail-to-rail input capability but allows wide dynamic range in high-side sensing. Input protection circuitry clamps differential swings >12V to prevent damage.

What thermal design considerations apply to the LTC6090IFE-5#PBF in its TSSOP-16E package?

The LTC6090IFE-5#PBF's TSSOP-16E package uses an exposed pad (Pin 17) electrically connected to V–. To achieve θJC = 10°C/W, the pad must be soldered to a large copper area tied to the V– plane using ≥6 thermal vias. Insufficient copper increases θJA to >70°C/W, risking junction temperatures exceeding 125°C at moderate power dissipation. Board cleaning post-soldering is mandatory to prevent flux-induced leakage paths at high voltage.