STMicroelectronics LDK130M33RY

Overview

LDK130M33RY 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 management and automotive point-of-load (P.O.L.) rails.

For engineers reviewing the LDK130M33RY datasheet, LDK130M33RY pinout, LDK130M33RY application, or LDK130M33RY equivalent, this page provides verified technical context, package-specific pin functions, real-world automotive and portable system use cases, and validated alternative options for low-noise, low-I_Q 3.3 V regulation under -40 °C to 125 °C operation.

Technical Context

The LDK130M33RY is a fixed-output 3.3 V LDO with internal reference, error amplifier, PMOS pass transistor, and thermal/short-circuit protection circuitry. Its architecture enables stable operation with only 1 µF ceramic output capacitance and supports logic-controlled shutdown via the EN pin.

It operates across 1.9 V to 5.5 V input range, maintains regulation down to 100 mV headroom at 100 mA load, and achieves 55 dB supply voltage rejection (120 Hz–10 kHz) - critical for noise-sensitive analog and RF subsystems in automotive electronics.

Key Specifications

Pinout & Package

SOT23-5L package: 5-pin surface-mount with exposed thermal pad (pin 5 = N/C, must be connected to GND); 1.3 mm height, RoHS-compliant, ECOPACK2 certified.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6210B332MR-G and ADM7172ACPZ-3.3-R7, the LDK130M33RY uniquely combines AEC-Q100 Grade 1 qualification, SOT23-5L compactness, 1 µF ceramic stability, and 51 µV_RMS noise - making it the only drop-in solution for production ADAS P.O.L. rails requiring all four attributes.

Availability

LDK130M33RY is available at Aetrix Electronics and suitable for automotive ADAS camera modules, infotainment SoC power rails, and telematics sensor interfaces requiring stable component supply across extended temperature and long-lifecycle programs.

Supply support for LDK130M33RY 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 devices since 1987.

The LDK130 series belongs to ST's automotive-optimized LDO portfolio, engineered specifically for noise-sensitive, low-power P.O.L. regulation in ADAS, body electronics, and infotainment systems operating across -40 °C to +125 °C.

FAQ

What is the minimum input voltage required for LDK130M33RY to maintain 3.3 V output at 300 mA?

The minimum input voltage is determined by dropout voltage. At 300 mA and 125 °C, max dropout is 400 mV (per Table 4). Thus, VIN(min) = 3.3 V + 0.4 V = 3.7 V. At 25 °C, typical dropout is 200 mV, so VIN can be as low as 3.5 V while sustaining full load.

Can LDK130M33RY operate with zero output capacitance?

No. The datasheet mandates a minimum 1 µF ceramic output capacitor for stability (Section 6, Figures 24–25). Omitting C_OUT causes oscillation and violates absolute maximum ratings. The device is not designed for capless operation.

Is the BYP pin required to be connected for LDK130M33RY?

No. For the fixed-output LDK130M33RY, the BYP pin is optional: a 10 nF capacitor reduces output noise, but if omitted, the pin must be left floating with no PCB trace - not tied to GND or V_OUT. Incorrect routing risks instability.

Does LDK130M33RY support reverse current blocking?

Yes. The internal PMOS pass transistor provides inherent reverse current blocking - when V_OUT > V_IN, the body diode is reverse-biased and no significant reverse current flows, protecting upstream sources during hot-swap or backup power scenarios.