STMicroelectronics LDK130C32R

Overview

LDK130C32R from STMicroelectronics is an AEC-Q100 Grade 1 automotive-qualified low-dropout linear regulator delivering 300 mA output current with 100 mV typical dropout at 100 mA, 30 µA typical quiescent current, ±2.0% output voltage accuracy at 25 °C, and operation from 1.9 V to 5.5 V input. It is designed for power-sensitive automotive point-of-load (P.O.L.) and ADAS subsystems requiring ultra-low noise and stable regulation under wide temperature (-40 °C to 125 °C).

For engineers reviewing the LDK130C32R datasheet, LDK130C32R pinout, LDK130C32R application, or LDK130C32R equivalent, this page provides verified technical context, validated pin functions, confirmed automotive-grade thermal and noise performance, and real-world selection guidance against comparable fixed-output LDOs.

Technical Context

The LDK130C32R implements a PMOS pass transistor architecture enabling very low dropout and near-zero ground current across load range. Its internal bandgap reference and error amplifier maintain tight output regulation despite input line variation (0.05 %/V) and load change (0.006 %/mA), with integrated thermal shutdown (160 °C) and short-circuit current limiting (450 mA typical).

Noise performance is optimized via dedicated bypass pin (BYP) supporting 10 nF capacitor for 51 µV_RMS output noise (10 Hz–100 kHz); supply voltage rejection exceeds 55 dB from 120 Hz to 10 kHz. Logic-controlled enable (EN) pin supports <1 µA shutdown current and defined high/low thresholds (1.2 V / 0.4 V) over full temperature range.

Key Specifications

Pinout & Package

LDK130C32R is packaged in SOT23-5L - a 5-pin, surface-mount, lead-free, RoHS-compliant package with 1.3 mm × 2.9 mm footprint and 1.45 mm height, optimized for high-density automotive PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-output LDO applications.

Compared with XC6210B322MR-G and NCP114AMX32TBG, LDK130C32R uniquely combines AEC-Q100 Grade 1 qualification, 30 µA IQ, and 51 µV_RMS noise - making it the only choice for thermally demanding, noise-sensitive automotive P.O.L. rails.

Availability

LDK130C32R is available at Aetrix Electronics and suitable for automotive ADAS camera modules, body control units, infotainment power sequencing, and telematics GNSS front-ends requiring stable component supply with full AEC-Q100 traceability and long-lifecycle support.

Supply support for LDK130C32R 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 microcontrollers, power management ICs, sensors, and automotive-grade analog devices.

The LDK130 series belongs to ST's automotive-optimized LDO portfolio, engineered specifically for low-noise, low-quiescent current point-of-load regulation in ADAS, body electronics, and infotainment systems.

FAQ

What output voltage does LDK130C32R deliver?

LDK130C32R delivers a fixed 3.2 V output with ±2.0% tolerance at 25 °C and ±3.0% over full temperature range (−40 °C to 125 °C). The "C32R" suffix explicitly denotes the 3.2 V fixed version in SOT23-5L package, confirmed in ST's official order code table (Table 11, DS9465 Rev 10).

Can LDK130C32R operate with a 1.9 V input?

Yes - LDK130C32R supports input voltages from 1.9 V to 5.5 V. At 1.9 V input, it can sustain 3.2 V output only if load current is zero (dropout = V_IN − V_OUT). With 100 mA load, minimum input is 3.3 V (3.2 V + 100 mV dropout); full 300 mA output requires ≥3.6 V input per dropout curves (Figure 34).

Is an external bypass capacitor mandatory for LDK130C32R?

No - the BYP pin is optional. When used, a 10 nF ceramic capacitor reduces output noise to 51 µV_RMS; if omitted, the pin must be left floating with no PCB trace. This flexibility allows noise-critical designs (e.g., radar receivers) to optimize performance while simplifying layout in less sensitive applications.

Does LDK130C32R require a minimum load current to maintain regulation?

No - LDK130C32R maintains regulation from 0 mA to 300 mA output current. Load regulation is specified at 0.006 %/mA, meaning output shifts only 19.2 µV per mA change across full range. Stability is ensured with ≥1 µF ceramic C_OUT, and no minimum load is required per electrical characteristics (Table 4) or typical performance data (Figure 12).