STMicroelectronics LDL212PUR

Overview

LDL212PUR from STMicroelectronics is a high-PSRR, low-dropout linear regulator IC supporting adjustable output voltages from 1.18 V to VIN − VDROP(MAX), with guaranteed 1.2 A output current, 350 mV typical dropout at full load, and operation across 2.5 V–18 V input range. It integrates enable control, thermal/current/power limiting, and undervoltage lockout for point-of-load regulation in DC-DC post-regulation and SMPS secondary stages.

For engineers reviewing the LDL212PUR datasheet, LDL212PUR pinout, LDL212PUR application, or LDL212PUR equivalent, this page delivers verified electrical specs (e.g., 87 dB PSRR @ 120 Hz, ±2% VOUT accuracy), package mapping (DFN6 3×3), validated pin functions (ADJ, EN, exposed GND pad), and real-world use cases in industrial power rails and consumer device LDO staging.

Technical Context

The LDL212PUR implements a precision bandgap-referenced op-amp control loop with internal RC filtering on the ADJ/SENSE pin, enabling stable regulation across temperature (−40 °C to 125 °C) and load (10 mA to 1.2 A). Its architecture supports both fixed-output and adjustable configurations via external resistor divider feedback.

Thermal protection triggers at 175 °C with 25 °C hysteresis, while UVLO activates below 2.3 V input with 200 mV hysteresis. The device achieves high PSRR (>40 dB up to 100 kHz) through optimized internal biasing and low-noise reference design, making it suitable for noise-sensitive analog and mixed-signal loads.

Key Specifications

Pinout & Package

LDL212PUR is packaged in DFN6 (3×3 mm) with exposed thermal pad requiring PCB GND connection. Pin 1 = VOUT, Pin 2 = ADJ/SENSE, Pin 3 = GND, Pin 4 = VIN, Pin 5 = NC, Pin 6 = EN.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with TPS7A4700RGWR and ADM7172ACPZ-R7, LDL212PUR uniquely balances 1.2 A drive capability, 18 V input support, and 87 dB PSRR-making it optimal for industrial DC-DC post-regulation where wide VIN, robust load handling, and mid-band ripple rejection are jointly required.

Availability

LDL212PUR is available at Aetrix Electronics and suitable for industrial PLC power supplies, consumer audio subsystems, FPGA point-of-load regulation, and SMPS post-regulation requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for LDL212PUR 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, specializing in power management, microcontrollers, and analog ICs for industrial, automotive, and consumer markets.

The LDL212PUR belongs to ST's high-PSRR LDO family, engineered specifically for noise-sensitive post-regulation in switched-mode power systems and demanding industrial environments.

FAQ

What output capacitor value and ESR are required for stable operation of LDL212PUR?

The LDL212PUR requires a minimum 4.7 µF ceramic output capacitor with ESR ≤ 100 mΩ at 100 kHz. For VOUT = 5 V, stability is ensured with COUT = 4.7–22 µF and ESR between 0.01 Ω and 100 mΩ, as confirmed in Figure 30 of DS11245. Tantalum or polymer capacitors may be used if ESR falls within this range.

Can LDL212PUR be used with an input voltage below 2.5 V?

No-LDL212PUR has a specified minimum input voltage of 2.5 V per Table 4 (Electrical Characteristics). Operation below this violates absolute maximum ratings and risks failure due to insufficient headroom for internal biasing and dropout margin. For sub-2.5 V applications, consider ST's LDL112 series.

How does the ADJ pin function in fixed-output variants versus adjustable versions?

In adjustable versions (e.g., LDL212PUR), the ADJ pin is the feedback node connected to an external resistor divider to set VOUT. In fixed-output variants (e.g., LDL212PU33R), the SENSE pin (same physical pin) must be shorted directly to VOUT per Note 1 in Table 1-this configures internal feedback and disables external adjustment.

Is the exposed thermal pad on the DFN6 (3×3) package electrically connected to GND?

Yes-the exposed pad is internally connected to GND and must be soldered to a dedicated PCB GND plane with ≥4 thermal vias (0.3 mm diameter) to achieve the rated thermal resistance of 15 °C/W (junction-to-case) and prevent thermal shutdown under 1.2 A load at 125 °C ambient.