LT1999CS8-20#PBF

Instrumentation, Op Amps, Buffer Amps Overview

The LT1999CS8-20#PBF is a high-speed, precision current sense amplifier manufactured by Analog Devices Inc. It features a fixed gain of 20V/V and operates from an independent 5V supply with a typical quiescent current of 1.55mA. The device monitors bidirectional currents via an external resistive shunt, providing an output voltage referenced to mid-supply or an external reference. It supports a common mode input range from –5V to 80V and includes a low-power shutdown mode consuming less than 10µA. The component is housed in an 8-lead SOIC package.

Instrumentation, Op Amps, Buffer Amps Feature Summary

• Provides buffered output with a fixed gain of 20V/V for precise current monitoring
• Supports smooth, continuous operation over a wide common mode input range from –5V to 80V
• Features a low power shutdown mode to minimize consumption when inactive
• Includes a dedicated reference pin to set the output common mode level

Instrumentation, Op Amps, Buffer Amps Applications

• H-Bridge motor controls
• Switching power supplies
• Solenoid current sensing
• Battery charge current monitoring

Instrumentation, Op Amps, Buffer Amps Procurement Notes

Verify the specific suffix #PBF indicates lead-free finish and tape and reel availability if required. Confirm the CS8 designation corresponds to the 8-lead plastic SO package. Ensure the temperature grade matches application requirements, as the 'C' suffix specifies commercial range performance. Cross-reference the manufacturer part number with official distributor catalogs to confirm current production status and exact packaging specifications.

Instrumentation, Op Amps, Buffer Amps Selection Notes

Select this variant when a fixed 20V/V gain is required for bidirectional current sensing applications. Consider the 80V common mode range for high-side or low-side configurations. Evaluate the 2MHz bandwidth against signal frequency requirements. Verify that the 5V supply constraint aligns with system power rails. Check if the standard SOIC package fits the PCB layout constraints compared to MSOP options.

Instrumentation, Op Amps, Buffer Amps Part Context

This component belongs to the LT1999 family of high-voltage current sense amplifiers. The family offers three gain options: 10V/V, 20V/V, and 50V/V. The LT1999 series is designed for high-speed precision monitoring in demanding environments. Variants include different temperature grades and package types such as MSOP and SOIC. The CS8-20 specifically denotes the commercial grade, SOIC package, and 20V/V gain configuration.

Instrumentation, Op Amps, Buffer Amps Replacement Considerations

LT1999CS8-10#PBF

Instrumentation, Op Amps, Buffer Amps FAQ

How is the output reference level determined?

The REF pin sets the output common mode level. By default, it is biased to mid-supply using internal 160k resistors, but it can be overdriven by an external voltage source.

What is the function of the SHDN pin?

The SHDN pin enables a low-power shutdown mode. Pulling it below 0.5V reduces supply current to less than 10µA. Leaving it floating activates the amplifier via an internal pull-up.