STMicroelectronics L4925PD013TR

Overview

L4925PD013TR from STMicroelectronics is a monolithic 5 V low-dropout linear voltage regulator with integrated power-on reset and programmable reset delay, designed for microcomputer-controlled automotive systems. It delivers up to 500 mA output current, maintains regulation down to 3 V input, features dropout voltage ≤0.6 V at 500 mA, quiescent current ≤360 µA (no load), and supports transient supply voltage up to 40 V.

For engineers reviewing the L4925PD013TR datasheet, L4925PD013TR pinout, L4925PD013TR application, or L4925PD013TR equivalent, key selection criteria include guaranteed 5 V ±2% output accuracy over temperature, programmable reset delay via external capacitor, thermal shutdown and short-circuit protection, and PowerSO-20 package compatibility with automotive-grade thermal performance (R_th(j-c) = 3.5 °C/W).

Technical Context

The L4925 uses an isolated-collector vertical PNP transistor as its pass element, enabling sub-0.6 V dropout at full 500 mA load while sustaining regulation down to 3 V input. Its internal reference (1.23 V) and precision divider set nominal 5 V output with ±2% tolerance across –40 to 125 °C junction temperature.

The integrated reset circuit monitors regulated V_O with a 4.2–4.8 V threshold and generates a clean active-low reset pulse; delay time (60–140 ms typical with 100 nF C_T) is set by external capacitor charge time, while reaction time (5–30 µs) improves noise immunity against supply transients.

Key Specifications

Pinout & Package

Package: PowerSO-20 (JEDEC MO-166), surface-mount, thermally enhanced with exposed die pad; dimensions 15.8 × 13.9 × 3.6 mm, weight 1.9 g.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 5 V automotive LDO with reset applications.

Compared with TLV70750PDPKR and MAX6467XS29D3+T, the L4925PD013TR uniquely integrates 500 mA LDO regulation, programmable reset delay, and automotive transient tolerance in one PowerSO-20 package-eliminating BOM count, layout area, and timing coordination overhead.

Availability

L4925PD013TR is available at Aetrix Electronics and suitable for engine control units, body control modules, ADAS camera ECUs, and infotainment head units requiring stable component supply across extended temperature and automotive transient conditions.

Supply support for L4925PD013TR 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, specializing in automotive, industrial, and power management ICs with broad manufacturing and quality certifications.

The L4925 belongs to ST's automotive-grade linear regulator product line, engineered specifically for robust, low-power, fault-tolerant microcontroller power delivery in harsh vehicle electrical environments.

FAQ

What is the minimum input voltage required for regulation at 500 mA output?

The L4925 maintains 5 V regulation down to 3 V input supply voltage in dropout mode, but functional regulation with full 500 mA output requires V_S ≥ (V_O + V_DP) = 5.0 V + 0.6 V = 5.6 V. Below 5.6 V, output voltage follows input minus dropout; stable 5 V output is guaranteed only above 6 V per datasheet operating range.

How is the reset delay time calculated and what capacitor value yields 100 ms?

Reset delay t_RD = C_T × 2 V / 2 µA. For 100 ms, solve C_T = (100 ms × 2 µA) / 2 V = 100 nF. A 100 nF ceramic capacitor (X7R, 10% tolerance) placed between CT pin and GND achieves nominal 100 ms delay, with actual range 60–140 ms per datasheet min/typ/max.

Does the L4925PD013TR require external capacitors, and what are their minimum values?

Yes: input capacitor C_S ≥ 1 µF and output capacitor C_O ≥ 10 µF are mandatory for stability. ST recommends 10–100 µF tantalum or ceramic capacitors with ESR ≤ 2.5 Ω at 10 kHz. C_O directly affects load transient response and reset circuit immunity; undersized C_O may cause false resets during fast load steps.

Is the PowerSO-20 package RoHS-compliant and lead-free?

Yes, the L4925PD013TR PowerSO-20 package is RoHS-compliant and lead-free per STMicroelectronics' standard qualification. The device meets JEDEC J-STD-020 moisture sensitivity level (MSL) 3 and is rated for peak reflow temperature of 260 °C, compatible with standard lead-free soldering profiles.