STMicroelectronics LDK130M28RY

Overview

LDK130M28RY 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 51 µV_RMS output noise (10 Hz–100 kHz) - used in ADAS power rails and automotive point-of-load (P.O.L.) systems.

For engineers reviewing the LDK130M28RY datasheet, LDK130M28RY pinout, LDK130M28RY application, or LDK130M28RY equivalent, this page provides verified package mapping (SOT23-5L), validated pin functions, confirmed thermal performance (−40 °C to 125 °C), and real-world substitution guidance for fixed-output LDO selection in safety-critical automotive subsystems.

Technical Context

The LDK130M28RY implements a PMOS pass transistor architecture enabling ultra-low dropout and stable operation with 1 µF ceramic output capacitance. Its internal bandgap reference and error amplifier maintain tight regulation across load (1–300 mA) and line (1.9–5.5 V) variations while supporting logic-controlled shutdown via the EN pin.

It integrates thermal shutdown (160 °C trip, 20 °C hysteresis) and short-circuit current limiting (450 mA typ.), with supply voltage rejection of 55 dB (120 Hz–10 kHz) and noise performance optimized by optional 10 nF bypass capacitor on the BYP/ADJ pin - critical for powering noise-sensitive analog sensors and MCU cores in automotive ECUs.

Key Specifications

Pinout & Package

LDK130M28RY is packaged in SOT23-5L - a 5-pin, surface-mount, lead-free, RoHS-compliant package measuring 2.9 mm × 1.6 mm × 1.1 mm (max height), qualified per AEC-Q100 Grade 1 for automotive use.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6210B282MR-G, LDK130M28RY delivers 50% higher current and automotive qualification; versus ADM7172ACPZ-2.8-R7, it offers 6× lower quiescent current and 30% smaller footprint at the expense of output current headroom.

Availability

LDK130M28RY is available at Aetrix Electronics and suitable for automotive ADAS, body electronics, and telematics applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.

Supply support for LDK130M28RY 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, and automotive-grade analog components.

The LDK130 series belongs to ST's automotive-optimized LDO portfolio, engineered specifically for low-noise, low-power point-of-load regulation in safety-critical vehicle subsystems including ADAS, infotainment, and body control.

FAQ

What is the maximum output current capability of LDK130M28RY?

The LDK130M28RY guarantees 300 mA continuous output current across its full operating temperature range (−40 °C to +125 °C). Internal current limiting activates at approximately 450 mA to protect against short circuits, and thermal shutdown engages at 160 °C junction temperature to prevent damage during sustained overload conditions.

Can LDK130M28RY operate with input voltage below 2.0 V?

Yes - the LDK130M28RY supports input voltages as low as 1.9 V, enabling operation during automotive cold-crank events where battery voltage dips to ~1.9 V. At this minimum input, it maintains regulation as long as the dropout condition is met (i.e., VIN ≥ VOUT + VDROP ≈ 2.9 V at 100 mA), so usable output is limited to light loads under deep undervoltage.

Is an external bypass capacitor required on the BYP/ADJ pin?

No - the BYP/ADJ pin on the fixed-output LDK130M28RY is optional for noise reduction. A 10 nF ceramic capacitor to GND improves PSRR and output noise; if omitted, the pin must be left unconnected (floating) with no PCB trace to avoid parasitic coupling. It must never be tied to OUT or GND directly.

Does LDK130M28RY support reverse current protection?

Yes - the LDK130M28RY incorporates inherent reverse-current blocking due to its PMOS pass transistor architecture. When input voltage falls below output voltage (e.g., during input disconnect or brownout), the device prevents reverse current flow from OUT to IN, eliminating the need for an external blocking diode in most automotive power architectures.