STMicroelectronics LDK130M-R

Overview

LDK130M-R 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 across 1.9–5.5 V input range in SOT23-5L package. It serves as a precision post-regulator for ADAS domain controllers and automotive point-of-load (P.O.L.) rails.

For engineers reviewing the LDK130M-R datasheet, LDK130M-R pinout, LDK130M-R application, or LDK130M-R equivalent, key selection criteria include its guaranteed 300 mA load capability under -40 °C to 125 °C junction temperature, logic-controlled shutdown (<1 µA OFF-mode current), ceramic capacitor compatibility (1 µF COUT), and low-noise performance (51 µVRMS, 10 Hz–100 kHz) critical for analog sensor and RF subsystem power domains.

Technical Context

The LDK130M-R employs a PMOS pass transistor architecture enabling ultra-low dropout and stable operation with minimal external components. Its internal bandgap reference and error amplifier deliver tight output regulation across line, load, and temperature variations - evidenced by 0.05 %/V line regulation and 0.006 %/mA load regulation.

It integrates logic-level enable control (V_EN(H) = 1.2 V min, V_EN(L) = 0.4 V max), thermal shutdown (160 °C trip with 20 °C hysteresis), and short-circuit current limiting (450 mA typ). The device supports both fixed-output and adjustable configurations, with the M-R suffix indicating a fixed-output variant.

Key Specifications

Pinout & Package

LDK130M-R is packaged in SOT23-5L - a 5-pin surface-mount package with 0.95 mm pitch, 2.9 mm × 1.6 mm footprint, and exposed thermal pad (pin 5 N/C connected to GND). This package delivers 160 °C/W junction-to-ambient thermal resistance and supports automated optical inspection (AOI) and reflow soldering per JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-noise automotive LDO applications.

Compared with XC6210B302MR-G and ADM7172ACPZ-3.0-R7, the LDK130M-R uniquely combines AEC-Q100 Grade 1 qualification, sub-1 µA shutdown current, integrated thermal protection, and 51 µVRMS noise - making it the only drop-in solution for safety-critical automotive P.O.L. rails requiring zero design margin compromise.

Availability

LDK130M-R is available at Aetrix Electronics and suitable for automotive ADAS camera modules, telematics control units, infotainment SoC auxiliary rails, and body electronics requiring stable component supply with full AEC-Q100 traceability and extended temperature support.

Supply support for LDK130M-R 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 products since 1987.

The LDK130 series belongs to ST's automotive-qualified LDO portfolio, engineered specifically for demanding point-of-load regulation in ADAS, infotainment, and body electronics - emphasizing low noise, ultra-low I_Q, and robust thermal/safety behavior.

FAQ

What output voltage does the LDK130M-R provide?

The LDK130M-R is a fixed-output variant delivering 3.0 V nominal output voltage, verified by ST's DS9465 Rev 10 datasheet Table 4 (V_OUT accuracy ±2.0% at 25 °C). The "M-R" suffix explicitly denotes the 3.0 V factory-trimmed version in SOT23-5L packaging, with no external resistor network required.

Can the LDK130M-R operate with a 1.9 V input and still regulate 3.0 V output?

No - the LDK130M-R cannot regulate 3.0 V output from a 1.9 V input due to its minimum dropout requirement. At 300 mA load, dropout reaches up to 400 mV (Table 4), meaning VIN must be ≥3.4 V to sustain 3.0 V VOUT. Minimum functional input for 3.0 V output is therefore 3.1 V (100 mV dropout typ. at light load).

Is a bypass capacitor mandatory on the BYP pin for the LDK130M-R?

No - the 10 nF bypass capacitor on the BYP pin is optional for noise reduction in the LDK130M-R fixed-output version. If omitted, the BYP pin must be left floating with no PCB routing, as stated in Table 1 and Section 3 of DS9465. Output stability is fully maintained with only 1 µF COUT.

Does the LDK130M-R support ceramic output capacitors smaller than 1 µF?

No - ST specifies 1 µF as the minimum recommended ceramic output capacitance (COUT) for stability across all loads and temperatures (Table 4, Section 6 figures). Using <1 µF risks oscillation or degraded transient response, as confirmed by Figure 24's stability region boundary starting at 1 µF for fixed versions.