STMicroelectronics LDL212PV33R

Overview

LDL212PV33R from STMicroelectronics is a high-PSRR, low-dropout linear regulator IC delivering 1.2 A output current with 350 mV typical dropout at full load, fixed 3.3 V output, and input voltage range of 2.5 V to 18 V. It features undervoltage lockout, enable control, thermal/current/power protection, and operates from –40 °C to 125 °C - used in DC-DC post-regulation and SMPS secondary regulation.

For engineers reviewing the LDL212PV33R datasheet, LDL212PV33R pinout, LDL212PV33R application, or LDL212PV33R equivalent, key selection considerations include dropout performance at 1.2 A, PSRR >75 dB at 1 kHz, ±2% output accuracy over temperature, SO-8/DFN6 package options, and enable logic compatibility with 0.4 V low / 1.2 V high thresholds.

Technical Context

The LDL212PV33R implements a precision bandgap reference and error amplifier driving a PMOS pass transistor, enabling stable regulation with minimal headroom. Its internal RC-filtered feedback path ensures robust stability with ceramic output capacitors as low as 4.7 µF and ESR down to 0.01 Ω.

Thermal shutdown (175 °C) and foldback current limiting protect against sustained overload; UVLO activates below 2.3 V with 200 mV hysteresis. The device supports both fixed-output (3.3 V) and adjustable configurations via separate order codes, with identical protection and performance across variants.

Key Specifications

Pinout & Package

LDL212PV33R is available in SO-8 batwing plastic micropackage and DFN6 (3x3) packages. Both feature exposed thermal pad (GND) for enhanced heat dissipation. Pin functions are identical across packages, with GND distributed across multiple pins for low-impedance return paths.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-dropout linear regulator applications.

Compared with TSDR212PV33R, LDL212PV33R offers cost-optimized industrial qualification without AEC-Q100 overhead; versus LDL112PV33R, it delivers 4× higher current but in larger SO-8/DFN6 (3x3) footprints - selection hinges on current demand and automotive compliance needs.

Availability

LDL212PV33R is available at Aetrix Electronics and suitable for industrial PLCs, automotive body electronics, FPGA configuration systems, and telecom power shelves requiring stable component supply with long-term lifecycle support.

Supply support for LDL212PV33R includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing silicon solutions for automotive, industrial, and power management applications.

The LDL212 series belongs to ST's high-PSRR, low-dropout linear regulator product line, engineered specifically for noise-sensitive post-regulation in switched-mode power supplies and demanding industrial environments.

FAQ

What is the minimum input voltage required for stable 3.3 V output at 1.2 A?

The LDL212PV33R requires VIN ≥ VOUT + VDROP(MAX). With 600 mV maximum dropout specified over temperature and load, the minimum input is 3.3 V + 0.6 V = 3.9 V. At room temperature, 3.65 V (3.3 V + 0.35 V typ.) suffices, but design margin mandates 3.9 V for full-spec operation.

Can the SENSE pin be left unconnected in the fixed 3.3 V version?

No - the SENSE pin (Pin 8 SO-8 / Pin 2 DFN6) must be connected directly to VOUT for proper regulation in fixed-output mode. Leaving it open causes output voltage instability or failure to regulate; this connection establishes the feedback loop for the internal error amplifier.

Does the device support reverse-voltage protection on the input or output?

No - LDL212PV33R lacks integrated reverse-voltage protection. Reverse bias on VIN or VOUT can damage the internal PMOS pass transistor or bandgap circuitry. External protection (e.g., series Schottky diode on VIN or back-to-back MOSFETs) is required in systems prone to polarity reversal.

How does thermal performance differ between SO-8 and DFN6 (3x3) packages?

DFN6 (3x3) offers lower thermal resistance: 10 °C/W junction-to-case vs. 20 °C/W for SO-8. With identical 55 °C/W junction-to-ambient, the DFN6 sustains ~1.2 A continuously at higher ambient temperatures (e.g., 85 °C) where SO-8 may require derating or airflow - verified by thermal data in Table 3 of DS11245.