LT3091MPFE#TRPBF

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Overview

The LT3091MPFE#TRPBF is a negative linear regulator from Analog Devices, rated for 1.5A output current with a wide input voltage range of –1.5V to –36V. It provides a rail-to-rail adjustable output voltage spanning from 0V to –32V. The device features low dropout performance, typically 300mV at full load, and maintains high power supply rejection ratio (PSRR) across frequencies. Output noise is specified at 18µVRMS within the 10Hz to 100kHz bandwidth. It includes programmable current limiting via a single external resistor and offers bidirectional shutdown logic.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Feature Summary

• Features a precision current reference followed by a high-performance rail-to-rail voltage buffer for stable regulation.
• Supports parallel operation to increase total output current or distribute thermal load on surface-mounted boards.
• Includes positive and negative current monitoring pins that source or sink currents proportional to the output load.
• Integrates built-in protections such as reverse output protection, internal foldback current limit, and thermal shutdown.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Applications

• Post-regulator stages for switching power supplies to reduce ripple and noise
• Low-noise instrumentation and RF power supply circuits
• Rugged industrial power systems requiring precise negative voltage rails
• Precision power supplies where output adjustability down to zero volts is required

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Procurement Notes

Verify the MP grade designation confirms the extended temperature range of –55°C to 150°C. Ensure the FE suffix matches the 16-lead TSSOP package requirement. Confirm the #TRPBF suffix indicates tape and reel packaging suitable for automated assembly processes. Cross-reference the manufacturer part number directly with official Analog Devices documentation to validate authenticity.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Selection Notes

Select this component when a negative voltage rail is required with high current capability and minimal heat sinking needs. The device is suitable for applications demanding low output noise and high PSRR independent of the programmed voltage level. Consider the thermal characteristics of the TSSOP package for adequate heat dissipation under maximum load conditions.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Part Context

This part belongs to the LT3091 family of negative linear regulators designed for precision applications. The MP grade variant specifically targets environments requiring operation across an extended industrial and military temperature spectrum. It complements other Linear Technology regulators by offering unique rail-to-rail output capabilities without sacrificing stability or noise performance.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Replacement Considerations

LT3091EFE#TRPBF: Same electrical specifications but limited to –40°C to 125°C operating temperature range.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators FAQ

How is the output voltage adjusted?

The output voltage is set by connecting a single resistor between the SET pin and GND. A precision 50µA current flows into the SET pin, allowing the output to be adjusted from 0V to –32V.

What is the minimum output capacitance required?

The device requires a minimum output capacitor of 10µF with an equivalent series resistance (ESR) less than 500mΩ to ensure stability and prevent oscillations.

Can the device be used in a floating configuration?

Yes, the LT3091 can be configured as a 3-terminal floating regulator, providing flexibility in circuit design where the ground reference may vary.