Analog Devices Inc. LTC6090CFE-5#PBF

Overview

LTC6090CFE-5#PBF from Analog Devices (formerly Linear Technology) is a high-voltage, precision, noise-gain-stable operational amplifier optimized for ±70V (140V total) supply operation. It delivers 12MHz gain-bandwidth product, 21V/µs slew rate, rail-to-rail output swing, picoamp input bias current (≤50pA), and 1.25mV max input offset voltage - enabling high-accuracy buffering and amplification in high-impedance, high-voltage signal chains such as photodiode front-ends and piezo drivers.

For engineers reviewing the LTC6090CFE-5#PBF datasheet, LTC6090CFE-5#PBF pinout, LTC6090CFE-5#PBF application, or LTC6090CFE-5#PBF equivalent, key selection criteria include noise-gain ≥5 stability requirement, TSSOP-16E thermal performance (θJC = 10°C/W), COM-referenced logic interface compatibility, and guaranteed 0°C to 70°C junction temperature range.

Technical Context

The LTC6090CFE-5#PBF implements a proprietary CMOS input stage with guarded inputs and internal ESD protection, supporting common-mode input range from V– + 3V to V+ – 3V. Its noise-gain ≥5 stability architecture enables robust closed-loop operation at high gains without external compensation.

Thermal management is integral: the exposed pad (Pin 17) connects to V– and must be soldered to PCB copper for low θJC (10°C/W); TFLAG open-drain output activates at 145°C die temperature with 5°C hysteresis; OD pin disables output stage while preserving input bias, drawing only 580µA standby current.

Key Specifications

Pinout & Package

Package: 16-lead plastic TSSOP with exposed pad (Pin 17 = V–), thermally enhanced for θJC = 10°C/W. Exposed pad must be soldered to PCB V– plane.

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 LTC6090CFE-5#PBF uniquely combines ±70V operation, noise-gain stability, integrated thermal flag, and guard-enabled TSSOP packaging - making it the only option for precision, self-protected, high-impedance HV amplification in space-constrained designs.

Availability

LTC6090CFE-5#PBF is available at Aetrix Electronics and suitable for photodiode amplification, piezo actuation, and high-voltage DAC buffering requiring stable component supply across industrial, test & measurement, and optical networking programs.

Supply support for LTC6090CFE-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, power, and signal conditioning domains.

The LTC6090CFE-5#PBF belongs to Linear's high-voltage precision op-amp family, engineered specifically for applications demanding rail-to-rail output, picoamp input bias, and robust thermal protection in ±70V systems.

FAQ

What is the minimum noise gain required for stable operation of the LTC6090CFE-5#PBF?

The LTC6090CFE-5#PBF is specified for stable operation at noise gain ≥5. Unlike the unity-gain-stable LTC6090, this variant requires closed-loop configurations with gain of 5 or higher to prevent oscillation. This is achieved via internal compensation optimized for high-gain precision applications, and external feedback networks must respect this constraint to ensure phase margin >60°.

How does the COM pin function in the LTC6090CFE-5#PBF, and what happens if it is left floating?

The COM pin on the LTC6090CFE-5#PBF serves as the reference voltage for OD and TFLAG logic levels. If left floating, an internal resistive divider pulls COM to ~30% above mid-supply (e.g., ~21V with ±70V supplies), which may violate absolute maximum ratings for OD/COM or TFLAG/COM (–3V to +7V). For reliable low-voltage interfacing, COM must be tied to the system's low-voltage ground.

Can the LTC6090CFE-5#PBF drive 200pF capacitive loads without instability?

Yes, the LTC6090CFE-5#PBF is characterized to drive up to 200pF of capacitive load while maintaining stability in noise-gain ≥5 configurations. This capability is verified in the datasheet's small-signal transient response plots and is enabled by its internal compensation and robust output stage. For loads >200pF, external isolation resistance or feedback capacitance may be required.

What is the purpose of the GUARD pins on the LTC6090CFE-5#PBF TSSOP package?

The eight GUARD pins (Pins 2,3,6,7,10,11,13,15) on the LTC6090CFE-5#PBF enable construction of a continuous PCB guard ring around the –IN and +IN traces. This reduces surface leakage currents and improves common-mode rejection in ultra-high-impedance applications like photodiode amplifiers, where even femtoamp leakage degrades accuracy.

Does the LTC6090CFE-5#PBF provide thermal protection, and how is it implemented?

Yes, the LTC6090CFE-5#PBF includes dual thermal protection: (1) TFLAG open-drain output activates at 145°C die temperature (5°C hysteresis), and (2) hard thermal shutdown triggers at 175°C. When TFLAG is tied to OD, the output stage disables automatically upon TFLAG assertion, preventing junction temperatures from exceeding 150°C - a critical reliability threshold.