STMicroelectronics L5300AH7TR

Overview

L5300AH7TR from STMicroelectronics is an AEC-Q100 qualified automotive-grade 5 V low-dropout linear voltage regulator with integrated power-on reset, low-voltage reset, and enable control. It delivers up to 300 mA output current with ±2% output voltage accuracy, 500 mV dropout at full load, and operates across 5.6 V–40 V input range in ambient temperatures from −40 °C to 150 °C junction. It powers microcontroller core logic and safety-critical ECUs requiring stable 5 V supply under harsh vehicle electrical conditions.

For engineers reviewing the L5300AH7TR datasheet, L5300AH7TR pinout, L5300AH7TR application, or L5300AH7TR equivalent, key selection criteria include its programmable reset delay via external capacitor, ultra-low 10 µA quiescent current in disabled mode, thermal shutdown behavior, and HPAK package thermal performance for engine bay mounting.

Technical Context

The L5300AH7TR uses a P-channel MOSFET pass element enabling low dropout (500 mV @ 300 mA) while maintaining regulation up to 40 V input. Its internal trimmed bandgap reference ensures ±2% output accuracy over temperature, line, and load variations - critical for automotive sensor and MCU power domains.

Reset functionality is implemented via dual-threshold comparator (VRlth = 19% Vo_ref, VRhth = 50% Vo_ref) driving an open-drain Res pin with 2 µs reaction time and externally programmable delay (2–6 ms with 1 nF). Enable logic features 500 mV hysteresis and supports direct connection to VS when unused.

Key Specifications

Pinout & Package

HPAK package: thermally enhanced surface-mount package with exposed thermal pad, optimized for PCB copper heatsinking. Dimensions per Table 9 (DS6143 Rev 13): D = 6.0–6.2 mm, E = 6.4–6.6 mm, H = 9.35–10.10 mm, footprint 6.4 mm × 7 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV73350PDBVR and MAX16150ATB+T, the L5300AH7TR uniquely combines 40 V input tolerance, 300 mA output, AEC-Q100 Grade 0 qualification, and programmable reset in a thermally robust HPAK package - making it the only drop-in solution for under-hood 5 V regulation with functional safety requirements.

Availability

L5300AH7TR is available at Aetrix Electronics and suitable for engine control units, ADAS domain controllers, body control modules, and electric power steering systems requiring stable component supply across extended temperature and automotive lifecycle demands.

Supply support for L5300AH7TR 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 specializing in automotive, industrial, and power management ICs, with broad portfolio coverage from microcontrollers to analog and power devices.

The L5300AH7TR belongs to ST's automotive LDO family designed specifically for demanding vehicle subsystems - emphasizing AEC-Q100 compliance, thermal resilience, and integrated supervision functions for functional safety.

FAQ

What is the minimum input voltage required for regulation at full 300 mA load?

The L5300AH7TR maintains regulation down to 5.5 V input at 300 mA load, based on its 500 mV dropout specification (Vo = 5.0 V, Vdp = 0.5 V → Vs_min = 5.5 V). This meets ISO 16750-2 cold-crank requirement of 6.0 V minimum for 12 V systems, with margin for trace losses.

How is reset delay time calculated and what capacitor value yields 4 ms?

Reset delay Trd = 32 × Tosc, where Tosc = [(VRhth−VRlth) × Ctr]/Icr + [(VRhth−VRlth) × Ctr]/Idr. With VRhth = 2.5 V, VRlth = 0.95 V, Icr = Idr = 20 µA (typ), solving for Trd = 4 ms gives Ctr ≈ 1.2 nF. A standard 1.2 nF ceramic capacitor achieves this delay.

Can the L5300AH7TR be used without connecting the Vos pin?

No - the Vos pin must be connected directly to the Vo output node. It provides feedback for precision regulation and remote sensing; leaving it unconnected degrades output voltage accuracy beyond ±2% and may cause instability due to uncontrolled loop gain.

What is the maximum allowable PCB copper area for thermal performance in free-air conditions?

Per DS6143 Rev 13 Figure 26, Rthj-amb drops to ~45 °C/W with 8 cm² copper area on double-layer FR4 board. Beyond 8 cm², diminishing returns occur; ST specifies optimal thermal performance at 8 cm² (e.g., 20 mm × 40 mm heatsink zone with thermal vias).