LDK320AM30R

Overview

The LDK320AM30R is a fixed-output low-dropout linear voltage regulator manufactured by STMicroelectronics. It provides a nominal output voltage of 3 V with a maximum output current capability of 200 mA. The device operates within an input voltage range of 2.5 V to 18 V and features a typical dropout voltage of 100 mV at 100 mA load. Quiescent current is typically 60 μA, reducing to less than 1 μA in shutdown mode via the enable pin. It offers high power supply rejection ratio (PSRR) of 88 dB at 120 Hz and includes thermal overload and short-circuit current limiting protections. The component is housed in a surface-mount SOT-23-5 package and supports operation from -40 °C to +125 °C.

Feature Summary

• Logic-controlled electronic shutdown function enables deep sleep mode with ultra-low standby current consumption.
• Integrated protection mechanisms include short-circuit current limiting, thermal overload shutdown, and safe operating area safeguards.
• Designed for stability with ceramic output capacitors, eliminating the need for bulky tantalum or aluminum electrolytic types.

Applications

• Digital Still Cameras (DSC)
• Television systems
• Blu-ray and DVD players
• Personal computers and peripherals
• Industrial control equipment

Procurement Notes

Verify the specific ordering suffix 'M' and 'R' against the manufacturer's official documentation to confirm the exact package variant and tape-and-reel packaging specifications. Ensure that the fixed 3 V output tolerance aligns with the design requirements, as the 'A' series denotes tighter accuracy compared to standard versions. Confirm RoHS compliance status through the official datasheet before finalizing procurement orders.

Selection Notes

Select this regulator for applications requiring stable power delivery from varying input sources within the 2.5 V to 18 V range. The low quiescent current makes it suitable for battery-powered devices where extending operational life is critical. The high PSRR ensures clean power supply even in noisy environments. Designers must ensure the output capacitor meets the minimum capacitance and ESR requirements specified in the stability plan to maintain regulation under all load conditions.

Part Context

The LDK320 belongs to a family of high-accuracy, high-PSRR low-dropout regulators designed for portable and industrial electronics. The 'A' designation indicates an enhanced version with tighter output voltage tolerance compared to the standard LDK320. This specific part number represents the fixed 3 V output variant packaged in SOT-23-5, optimized for space-constrained printed circuit board layouts while maintaining robust performance characteristics.

Replacement Considerations

Direct substitutes within the same family include other LDK320 variants with different output voltages or packages, such as LDK320AM33R for 3.3 V output. Cross-family replacements require matching input/output voltage ranges, current capabilities, and package dimensions. Verify that alternative components support ceramic output capacitors and offer comparable PSRR and quiescent current specifications.

FAQ

Is the LDK320AM30R stable with ceramic output capacitors?

Yes, the device is specifically designed to be stabilized with a ceramic capacitor on the output, typically requiring a capacitance between 1 μF and 22 μF.

How does the enable pin affect power consumption?

Driving the enable pin low places the device in shutdown mode, reducing the total current consumption to less than 1 μA, which is beneficial for battery-powered applications.

What protection features are included in the LDK320AM30R?

The regulator includes internal short-circuit current limiting, thermal overload protection, and safe operating area (SOA) protection to safeguard the device under fault conditions.