LT3045HDD#PBF

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

The LT3045HDD#PBF is a high-performance low dropout linear regulator featuring ultralow noise and ultrahigh PSRR architecture for powering noise-sensitive applications. It supplies 500mA at a typical 260mV dropout voltage with an operating quiescent current of nominally 2.2mA, dropping to less than 1µA in shutdown. The device offers a wide output voltage range from 0V to 15V while maintaining unity-gain operation. It includes programmable current limit, fast start-up capability, and programmable power good functionality.

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

• Ultralow RMS Noise: 0.8µVRMS (10Hz to 100kHz)
• Ultrahigh PSRR: 76dB at 1MHz
• Parallelable for Lower Noise and Higher Current
• Reverse-Battery and Reverse-Current Protection

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

• RF Power Supplies: PLLs, VCOs, Mixers, LNAs, PAs
• Very Low Noise Instrumentation
• High Speed/High Precision Data Converters
• Medical Applications: Imaging, Diagnostics

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

Verify the specific H-grade temperature rating (-40°C to 150°C) against your design requirements. Confirm the package type matches your PCB footprint. Check for automotive-specific variants if required by your application standards. Ensure proper thermal management is planned for the DFN package.

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

Select this component for designs requiring ultra-low noise performance and high power supply rejection ratio. Consider the parallelable architecture if higher output currents or lower noise are needed. Verify input voltage ranges and ensure adequate heat dissipation for the chosen load conditions.

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

The LT3045 series is designed as a precision current reference followed by a high-performance voltage buffer. This architecture allows multiple devices to be easily paralleled to further reduce noise, increase output current, and spread heat on the PCB. It is suitable for common noise-sensitive power applications in instrumentation and medical fields.

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

LT3045EDD#PBF

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

How does the LT3045 handle reverse battery connections?

The LT3045 withstands reverse voltages on the IN pin with respect to GND, OUTS, and OUT. In case of a reversed input, it acts as if a diode is in series with its input, preventing reverse current flow and protecting both the device and the load.

What is the function of the SET pin?

The SET pin sources a precision 100µA current that flows through an external resistor connected between SET and GND. The output voltage is determined by the formula VSET = ISET • RSET, allowing the output voltage range to be set from zero to 15V.