STMicroelectronics LDK130C-R

Overview

LDK130C-R from STMicroelectronics is an AEC-Q100 Grade 1 automotive-qualified low-dropout linear regulator in SOT23-5L package, delivering 300 mA output 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 power supply for ADAS sensor modules requiring ultra-low noise and stable bias under wide temperature variation.

For engineers reviewing the LDK130C-R datasheet, LDK130C-R pinout, LDK130C-R application, or LDK130C-R equivalent, key selection criteria include its automotive-grade thermal performance (−40 °C to 125 °C), logic-controlled shutdown (<1 µA OFF current), ceramic-capacitor compatibility (1 µF COUT), and fixed-output variants supporting battery-powered ADAS front-end circuits.

Technical Context

The LDK130C-R implements a PMOS pass transistor architecture enabling very low dropout and minimal load-dependent regulation shift. Its internal bandgap reference and error amplifier maintain tight output tolerance across temperature and load, with integrated thermal shutdown (160 °C) and short-circuit current limiting (450 mA typical).

It features dual-mode enable control: active-high logic input (EN pin thresholds 1.2 V min high / 0.4 V max low) and internal hysteresis (20 °C) for robust noise immunity in automotive ECU environments. The BYP/ADJ pin supports either noise-reduction bypass capacitor (fixed version) or external resistor divider (adjustable version), though LDK130C-R is the fixed-output variant.

Key Specifications

Pinout & Package

SOT23-5L package: 5-pin surface-mount, 2.9 mm × 1.6 mm footprint, 1.3 mm height, thermal pad optional (no exposed pad in standard SOT23-5L per ST mechanical drawing DS9465 Rev 10, Table 6).

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6210B282MR-G, LDK130C-R delivers higher current, lower dropout, and full automotive qualification; versus ADM7172ACPZ-2.8-R7, it trades some noise/PSRR performance for smaller size, lower cost, and tighter integration in space-constrained ADAS modules.

Availability

LDK130C-R is available at Aetrix Electronics and suitable for automotive ADAS camera modules, infotainment SoC core rails, telematics RTC backup supplies, and body control module sensor interfaces requiring stable component supply across extended temperature and long product lifecycles.

Supply support for LDK130C-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, and automotive-grade analog components.

The LDK130 series belongs to ST's automotive-optimized LDO portfolio, engineered specifically for power integrity in ADAS, infotainment, and body electronics where low noise, high reliability, and AEC-Q100 compliance are mandatory.

FAQ

What output voltage does LDK130C-R provide?

LDK130C-R is a fixed-output variant delivering 2.8 V nominal output voltage, confirmed by ST's order code designation (C = 2.8 V, per DS9465 Rev 10 Table 11). Output tolerance is ±2.0% at 25 °C and ±3.0% across −40 °C to +125 °C operating junction temperature.

Can LDK130C-R operate with a 1.9 V input and 2.8 V output?

No - the minimum input voltage required to sustain 2.8 V output is VIN ≥ VOUT + VDROP. With 200 mV max dropout at 300 mA (Table 4), minimum functional input is 3.0 V. At 1.9 V input, the device enters dropout and cannot regulate 2.8 V; it remains functional only for output voltages ≤1.8 V in that range.

Is an external bypass capacitor mandatory on the BYP pin?

No - the BYP pin is optional for noise reduction on fixed-output versions. If omitted, the pin must be left floating with no PCB trace connected (per Table 1 footnote). Adding a 10 nF ceramic capacitor reduces output noise from 51 µVRMS to ~25 µVRMS, but is not required for basic regulation stability.

Does LDK130C-R support reverse polarity protection?

No - the device lacks integrated reverse-voltage protection. Absolute maximum rating for input voltage is −0.3 V (Table 2), meaning sustained reverse bias will damage the IN-to-GND junction. External protection (e.g., series Schottky diode or ideal diode controller) is required in systems prone to battery reversal or hot-plug events.