Analog Devices Inc. LTC6090IFE#PBF

Overview

LTC6090IFE#PBF from Analog Devices (acquired Linear Technology) is a high-voltage, precision rail-to-rail output CMOS op amp designed for ±70V (140V total) supply operation. It delivers 50mA output drive, 12MHz gain-bandwidth product, 21V/µs slew rate, and 50pA max input bias current - enabling high-impedance buffering and high-gain amplification in photodiode, piezo driver, and high-voltage DAC buffer applications.

For engineers reviewing the LTC6090IFE#PBF datasheet, LTC6090IFE#PBF pinout, LTC6090IFE#PBF application, or LTC6090IFE#PBF equivalent, key selection criteria include guaranteed ±70V supply capability, thermal warning flag (TFLAG), output disable (OD) control, guard ring support in TSSOP-16E package, and verified performance across –40°C to 85°C junction temperature range.

Technical Context

The LTC6090IFE#PBF implements a proprietary high-voltage CMOS process with differential input stage, rail-to-rail output stage capable of sourcing/sinking 50mA, and integrated die temperature sensor feeding an open-drain TFLAG output active above 145°C. Its unity-gain stability supports direct use in voltage follower configurations without external compensation.

It features dedicated COM pin for low-voltage logic interfacing, OD pin with internal 2MΩ pull-up and 0.65V logic threshold referenced to COM, and eight guard pins in the FE package to support guard-ring layouts that reduce leakage and improve input impedance integrity at high common-mode voltages.

Key Specifications

Pinout & Package

Package: 16-lead plastic TSSOP with exposed pad (Pin 17 = V–), rated for –40°C to 85°C operating junction temperature, θ_JC = 10°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LT1490AIS8#PBF and OPA454AIDDA, the LTC6090IFE#PBF uniquely combines ±70V operation, 50mA drive, integrated TFLAG/OD, and TSSOP guard pins - making it the only option supporting photodiode amplifiers, piezo drivers, and optical networking front-ends requiring full 140V compliance and board-level leakage control.

Availability

LTC6090IFE#PBF is available at Aetrix Electronics and suitable for high-voltage DAC buffering, piezo actuator control, photodiode signal conditioning, and optical networking transimpedance amplification requiring stable component supply across extended temperature and high-reliability production cycles.

Supply support for LTC6090IFE#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, formed through the acquisition of Linear Technology in 2017.

The LTC6090 product line was developed by Linear Technology to address precision high-voltage signal conditioning needs in test equipment, medical imaging, optical infrastructure, and industrial automation - emphasizing rail-to-rail output, ultra-low input bias, and integrated thermal safety.

FAQ

What is the maximum supply voltage rating for the LTC6090IFE#PBF?

The LTC6090IFE#PBF has an absolute maximum total supply voltage (V+ to V–) of 150V, with recommended operation up to ±70V (140V total). Operation beyond ±70V risks exceeding safe operating area limits and may trigger thermal shutdown. The device is fully characterized and guaranteed across ±4.75V to ±70V, including PSRR >112dB and CMRR >130dB at full range.

Does the LTC6090IFE#PBF support rail-to-rail input common-mode range?

No, the LTC6090IFE#PBF does not support rail-to-rail input. Its specified input common-mode voltage range is V–+3V to V+–3V (e.g., –67V to +67V at ±70V supplies), guaranteed by 130dB CMRR. This 3V margin prevents input stage saturation and maintains precision; attempting to operate outside this range degrades offset, CMRR, and noise performance.

How is the COM pin used in LTC6090IFE#PBF circuits?

The COM pin on the LTC6090IFE#PBF serves as the reference node for OD and TFLAG logic levels. It must be tied to low-voltage system ground (e.g., MCU logic ground) to define valid 0.65V/1.8V thresholds for OD activation and TFLAG pull-down. If left floating, COM rises to ~30% of mid-supply due to internal resistive divider, invalidating OD/TFLAG interfacing and risking latch-up.

Can the LTC6090IFE#PBF drive capacitive loads up to 200pF without oscillation?

Yes, the LTC6090IFE#PBF is explicitly characterized to drive up to 200pF capacitive loads stably in unity-gain configuration, as confirmed in the datasheet's "Small Signal Frequency Response" plots and "Phase Margin" specification (60° min at RL=10kΩ, CL=50pF). For loads >100pF, use feedback resistor values ≥10kΩ and minimize parasitic capacitance at the output node.

What is the function of the guard pins in the LTC6090IFE#PBF TSSOP package?

The eight guard pins (Pins 2,3,6,7,10,11,13,15) in the LTC6090IFE#PBF TSSOP package enable PCB-level guard rings around high-impedance inputs. When driven at the same potential as –IN/+IN (e.g., via unity-gain buffer), they reduce surface leakage and stray capacitance - critical for maintaining <1pA input bias in photodiode and electrometer applications operating at ±70V common-mode.