LDL212D33R

Overview

The LDL212D33R is a fixed-output linear regulator from the LDL212 family, manufactured by STMicroelectronics. It provides a guaranteed output current of 1.2 A with a typical dropout voltage of 350 mV at full load. The device operates within an input voltage range of 2.5 V to 18 V and supports a maximum input voltage of 20 V. It features high power supply rejection ratios of 87 dB at 120 Hz and 75 dB at 1 kHz. The quiescent current ranges from 250 µA to 380 µA across the operating temperature range of -40 °C to 125 °C. Protection functions include thermal shutdown, current limiting, and undervoltage lockout.

Feature Summary

• Provides stable 1.2 A output current with low dropout characteristics for efficient regulation.
• Features high power supply rejection ratio suitable for noise-sensitive applications.
• Includes enable logic control function to reduce total current consumption in standby mode.
• Integrates internal thermal, current, and power limitation protections.

Applications

• Direct regulation in switch-mode power supplies (SMPS)
• Secondary linear regulation in DC-DC converters
• Point-of-load regulation
• Consumer electronics
• Industrial equipment

Procurement Notes

Verify component authenticity through authorized STMicroelectronics distributors or partners. Confirm package type matches design requirements, as the LDL212 series is available in SO-8, DFN6 (3x3), and DFN6 (2x2) packages. Check datasheet revision history for any updates to electrical characteristics or ordering codes before finalizing procurement specifications.

Selection Notes

Select the LDL212D33R when a fixed 3.3 V output is required with up to 1.2 A load capability. Ensure the input voltage remains within the 2.5 V to 18 V operational range. Consider the SO-8 or DFN6 packages based on thermal management needs and PCB space constraints. Verify that the application benefits from the device's high PSRR and low dropout performance.

Part Context

The LDL212D33R belongs to the LDL212 family of high PSRR, low-dropout linear regulators. This family offers flexible output voltage options, including adjustable versions and various fixed voltages. The devices are designed for applications requiring clean power delivery with minimal voltage drop, utilizing advanced CMOS technology for low quiescent current operation.

Replacement Considerations

LDL212PV33R is a documented alternative package variant (DFN6 3x3) providing the same 3.3 V output and 1.2 A current rating. Ensure pin compatibility and thermal resistance differences between SO-8 and DFN6 packages are accounted for during replacement evaluation.

FAQ

What is the maximum input voltage the LDL212D33R can withstand?

The absolute maximum DC input voltage rating is 20 V, although the recommended operating input voltage range is 2.5 V to 18 V.

How does the enable function affect power consumption?

Pulling the enable pin low puts the device into shutdown mode, significantly reducing the input current to a maximum of 1.5 µA at 18 V input.

What protection features are integrated into the LDL212D33R?

The device includes internal thermal shutdown, current limiting, safe operating area (SOA) protection, and undervoltage lockout (UVLO).