STMicroelectronics L5300GJ

Overview

L5300GJ from STMicroelectronics is an AEC-Q100 qualified automotive 5 V low-dropout linear voltage regulator with integrated microprocessor supervision functions including power-on reset, low-voltage reset, early warning, and enable control. It delivers up to 300 mA output current, maintains ±2% output accuracy over −40 °C to 150 °C junction temperature, and operates from 5.6 V to 40 V input supply. It is used in engine control units (ECUs), body control modules (BCMs), and ADAS domain controllers where stable 5 V rail generation and system-level fault detection are required.

For engineers reviewing the L5300GJ datasheet, L5300GJ pinout, L5300GJ application, or L5300GJ equivalent, key selection considerations include its 500 mV dropout at 300 mA, programmable reset delay via external capacitor on Vcr, early warning input threshold (2.50 V typ), thermal shutdown at 150 °C, and PowerSSO-12 package compatibility with high-power automotive PCB layouts.

Technical Context

The L5300GJ integrates a p-channel MOSFET pass element enabling ultra-low dropout operation while maintaining tight output regulation across wide line (5.6–40 V) and load (0.1–300 mA) ranges. Its internal bandgap reference and on-chip trimming ensure ±2% output voltage accuracy over temperature, line, and load variations without external calibration.

Supervision circuitry includes three independent functional blocks: a reset generator with adjustable delay (via external capacitor on Vcr), an early warning comparator monitoring VS through a resistor divider on EWi, and a digital enable input (En) with hysteresis (500 mV) for noise-immune ON/OFF control - all operating within the same −40 °C to 150 °C junction range.

Key Specifications

Pinout & Package

Package: PowerSSO-12 (exposed substrate tab, thermally enhanced SO-12 variant). Mounting requires GND connection to tab or PCB copper pour for optimal thermal performance (R_thj-amb = 48 °K/W on specified 8 cm² heatsink).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV73350PDBVR and MAX16910ATA+T, the L5300GJ uniquely combines 40 V input capability, programmable reset delay, and early warning in a single PowerSSO-12 package - making it optimal for direct battery-connected automotive subsystems needing predictive fault detection and cold-crank resilience.

Availability

L5300GJ is available at Aetrix Electronics and suitable for engine control units, body control modules, and ADAS domain controllers requiring stable component supply with automotive-grade reliability and long-term lifecycle support.

Supply support for L5300GJ 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 solutions, with broad portfolio certification to AEC-Q100 and ISO 26262.

The L5300GJ belongs to ST's automotive power management IC family, designed specifically for robust, feature-rich voltage regulation in harsh-temperature vehicle subsystems where functional safety and supply resilience are critical.

FAQ

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

The L5300GJ maintains regulation down to 5.6 V input at 300 mA output, corresponding to a 500 mV dropout voltage. This enables reliable operation during automotive cold-crank events where battery voltage may dip to 6 V or lower. The device remains functional up to 40 V, covering load-dump transients without external clamping.

How is the reset delay time calculated and what capacitor value achieves a 10 ms delay?

Reset delay Trd = 32 × Tosc, where Tosc = [(VRhth − VRlth) × Ctr] / Icr + [(VRhth − VRlth) × Ctr] / Idr. With typical values VRhth = 2.5 V, VRlth = 0.95 V, Icr = Idr = 20 µA, solving for Trd = 10 ms yields Ctr ≈ 3.3 nF. A standard 3.3 nF capacitor on Vcr achieves this delay at 25 °C.

Can the early warning function monitor voltages above 40 V, such as alternator output during load dump?

No - the EWi pin absolute maximum rating is 40 V, and its internal comparator reference is fixed at ~2.5 V. To monitor higher voltages, an external resistor divider must scale VS down to ≤40 V at EWi while maintaining sufficient signal-to-noise ratio; the divider must also withstand load-dump energy per AEC-Q100 stress requirements.

Is the exposed tab (TAB) electrically isolated, and how should it be connected on the PCB?

The TAB is internally connected to the silicon substrate and is not electrically isolated. ST recommends connecting it directly to the GND plane using multiple thermal vias to maximize heat dissipation and reduce R_thj-amb. Leaving it unconnected degrades thermal performance and risks exceeding junction temperature limits under sustained 300 mA load.