STMicroelectronics LDK130C29R

Overview

LDK130C29R 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 powers safety-critical ADAS domain controllers requiring ultra-low noise and stable 2.9 V rail under battery-voltage transients.

For engineers reviewing the LDK130C29R datasheet, LDK130C29R pinout, LDK130C29R application, or LDK130C29R equivalent, this page provides verified package mapping (SOT23-5L), validated pin functions, confirmed automotive thermal performance (-40 °C to 125 °C), and real-world substitution guidance for fixed-output LDO selection in power management subsystems.

Technical Context

The LDK130C29R implements a PMOS pass transistor architecture enabling ultra-low dropout and near-zero gate-drive current, supporting stable regulation down to 1.9 V input while maintaining 2.9 V output. Its internal bandgap reference and error amplifier deliver ±2.0% initial accuracy and <0.006 %/mA load regulation over temperature.

Logic-controlled enable (EN) pin supports active-high sequencing with 1.2 V min high-threshold and 0.4 V max low-threshold across -40 °C to 125 °C; shutdown mode draws <1 µA total current. Integrated thermal shutdown (160 °C trip, 20 °C hysteresis) and short-circuit current limiting (450 mA typ.) ensure robust fault handling in automotive environments.

Key Specifications

Pinout & Package

LDK130C29R 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), optimized for high-density automotive PCB layouts and reflow compatibility.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6219B292MR-G, LDK130C29R adds automotive qualification and 300 mA capability at lower cost; versus ADM7172ACPZ-2.9-R7, it delivers optimal balance of current, noise, and quiescent power for mid-tier ADAS nodes without over-engineering.

Availability

LDK130C29R is available at Aetrix Electronics and suitable for automotive ADAS camera modules, telematics control units, infotainment audio subsystems, and electric power steering sensor interfaces requiring stable component supply across extended temperature and long-lifecycle programs.

Supply support for LDK130C29R 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 since 1987.

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

FAQ

What is the maximum output current capability of LDK130C29R under continuous operation?

The LDK130C29R guarantees 300 mA output current across its full operating temperature range (-40 °C to +125 °C) with proper PCB copper pour and thermal relief. At 100 mA load, dropout remains ≤100 mV; at 300 mA, dropout rises to ≤400 mV (40–125 °C), requiring minimum 2.9 V + 0.4 V = 3.3 V input for regulation.

Can LDK130C29R be used with a 1 µF ceramic output capacitor only, without additional bulk capacitance?

Yes - the device is explicitly characterized and stabilized with a single 1 µF X5R/X7R ceramic capacitor (ESR <1 Ω) on the output, per Table 4 and Figure 24 in DS9465 Rev 10. No bulk electrolytic or tantalum capacitor is required, simplifying layout and improving reliability in automotive shock/vibe environments.

Does LDK130C29R support reverse current blocking during shutdown?

Yes - the integrated PMOS pass transistor inherently blocks reverse current flow from OUT to IN when the device is disabled (EN = low). This prevents back-powering of upstream supplies and protects against battery drain in multi-rail systems where other regulators remain active.

How does the BYP pin function in the fixed-output LDK130C29R variant?

In LDK130C29R (fixed 2.9 V version), Pin 4 is the BYP terminal. A 10 nF ceramic capacitor between BYP and GND reduces output noise by filtering reference voltage ripple. If unused, the pin must be left floating - no PCB trace or connection is permitted, as stated in Table 1 and Section 3 of the datasheet.