STMicroelectronics LDK130M12R

Overview

LDK130M12R 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 serves as a precision post-regulator in battery-powered ADAS sensor modules requiring ultra-low noise and stable 1.2 V rail.

For engineers reviewing the LDK130M12R datasheet, LDK130M12R pinout, LDK130M12R application, or LDK130M12R equivalent, key selection criteria include its SOT23-5L automotive package, logic-controlled shutdown (≤1 µA OFF current), ceramic capacitor compatibility (COUT = 1 µF), thermal/short-circuit protection, and fixed 1.2 V output voltage.

Technical Context

The LDK130M12R implements a PMOS pass transistor architecture enabling very low dropout and high PSRR (55 dB from 120 Hz to 10 kHz). Its internal bandgap reference and error amplifier maintain tight output regulation across load (1–300 mA), line (VIN = 1.9–5.5 V), and temperature (−40 °C to +125 °C) variations.

It integrates a dedicated enable input (EN) with guaranteed logic thresholds (VIL ≤ 0.4 V, VIH ≥ 1.2 V) and supports bypass capacitor connection on the BYP/ADJ pin for noise reduction-critical for powering RF-sensitive analog front-ends in automotive radar receivers.

Key Specifications

Pinout & Package

LDK130M12R is packaged in SOT23-5L - a 5-pin, surface-mount, lead-free, RoHS-compliant automotive-grade package with 1.3 mm × 2.8 mm footprint and 1.0 mm height, optimized for high-reliability PCB assembly in space-constrained ADAS modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6210B122MR-G and RT9013-12GB, LDK130M12R uniquely combines AEC-Q100 Grade 1 qualification, 30 µA IQ, 51 µVRMS noise, and 100 mV dropout in SOT23-5L-making it the only choice for thermally demanding, safety-critical automotive PoL applications.

Availability

LDK130M12R is available at Aetrix Electronics and suitable for automotive ADAS sensor modules, telematics control units, and infotainment power management systems requiring stable component supply across extended product lifecycles.

Supply support for LDK130M12R 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-qualified LDO portfolio, engineered specifically for high-reliability point-of-load regulation in ADAS, body electronics, and infotainment systems operating under harsh thermal and electrical conditions.

FAQ

What is the minimum input voltage required for LDK130M12R to maintain 1.2 V output at 300 mA load?

The minimum input voltage is determined by dropout voltage. At 300 mA and 125 °C, maximum dropout is 400 mV (per Table 4). Thus, VIN(min) = 1.2 V + 0.4 V = 1.6 V. However, the absolute minimum specified operating VIN is 1.9 V per datasheet - so 1.9 V is the guaranteed functional lower limit.

Can LDK130M12R be used with a 0.47 µF output capacitor instead of the recommended 1 µF?

No. The stability region analysis (Figure 24) shows that 0.47 µF falls outside the stable zone for fixed-output versions when ESR exceeds ~0.3 Ω. Using 0.47 µF risks oscillation under load transients. ST specifies 1 µF minimum ceramic COUT for guaranteed stability across temperature and process variation.

Does LDK130M12R require a bypass capacitor on the BYP pin for optimal noise performance?

Yes - a 10 nF ceramic capacitor between BYP and GND reduces output noise by ~15 µVRMS (from 66 µVRMS to 51 µVRMS, per Figures 20–22). While optional for basic functionality, it is strongly recommended for radar, camera, and audio applications where sub-100 µVRMS noise is critical.

How does the enable pin behave during power-up when VIN ramps from 0 V to 5.5 V?

The EN pin has hysteresis and threshold tracking: logic low remains valid until VIN reaches ≥1.2 V (VIH min), and the device remains enabled until VIN drops below ~1.0 V (VIH minus hysteresis). This prevents false toggling during slow power ramp-up and ensures clean startup without output glitches.