STMicroelectronics L5150GJTR

Overview

L5150GJTR from STMicroelectronics is an AEC-Q100 qualified automotive-grade 5 V low-dropout linear voltage regulator with integrated power-on reset, early warning, and enable control functions. It delivers up to 150 mA output current, maintains ±2% output voltage accuracy across -40 °C to 150 °C junction temperature, and operates from 5.6 V to 40 V input supply - used in engine control units and body electronics for stable microcontroller power rail conditioning.

For engineers reviewing the L5150GJTR datasheet, L5150GJTR pinout, L5150GJTR application, or L5150GJTR equivalent, key selection criteria include its programmable reset delay (via external capacitor), adjustable reset threshold down to 3.5 V, ultra-low 5 µA quiescent current when disabled, thermal shutdown behavior at 150 °C, and compatibility with low-value ceramic output capacitors (≥220 nF) for stability.

Technical Context

The L5150GJTR integrates a p-channel MOS pass transistor enabling dropout voltage as low as 500 mV at 150 mA while supporting wide input range (5.6–40 V). Its internal bandgap reference and on-chip trimming ensure ±2% output voltage accuracy over line, load, and temperature variations.

Three independent monitoring circuits operate simultaneously: a reset circuit comparing Vo against an adjustable threshold (set via Res_Adj pin), an early warning circuit sensing VS through EWi/ EWo pins, and an enable input (En) with hysteresis (500 mV) for noise-immune on/off control - all implemented in a single PowerSSO-12 package with substrate-connected thermal tab.

Key Specifications

Pinout & Package

Package: PowerSSO-12 (exposed substrate thermal pad), RoHS-compliant, surface-mount, 5.0 mm × 6.0 mm footprint with 0.5 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NCP1117ST50T3G, L5150GJTR integrates supervision features and fits compact layouts; versus TLE42754G, it adds early warning for predictive fault handling - making it preferred for ASIL-B–related subsystems requiring layered voltage monitoring.

Availability

L5150GJTR 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 under automotive qualification and long-term production continuity.

Supply support for L5150GJTR 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 devices since 1987.

The L5150GJTR belongs to ST's automotive power management portfolio, engineered specifically for functional safety-critical vehicle subsystems requiring AEC-Q100 compliance, wide temperature operation, and integrated system supervision.

FAQ

What is the minimum input voltage required for regulation at full 150 mA load?

The L5150GJTR maintains regulation down to 5.6 V input at 150 mA load, corresponding to a maximum dropout of 500 mV (5.0 V + 0.5 V). This enables reliable operation during automotive cold-crank events where battery voltage may dip to 6.0 V, provided PCB layout minimizes trace resistance between VS pin and bulk capacitor.

Can the reset threshold be set below 3.5 V?

No - the datasheet specifies 3.5 V as the absolute lower limit for adjustable reset threshold via Res_Adj, determined by internal reference and comparator design. Attempting to set lower using external resistors risks violating the absolute maximum rating of -0.3 V on Res_Adj and may cause undefined reset behavior or damage.

Is the TAB (substrate pad) required to be connected to GND?

While the TAB may be left floating per datasheet, STMicroelectronics recommends connecting it to GND for optimal thermal performance: R_thj-amb improves from 52 °K/W to ≤40 °K/W with 2 cm² copper area and thermal vias. Leaving it unconnected increases junction temperature by up to 25 °C under 150 mA load at 125 °C ambient.

How does the early warning function interact with the reset output?

Early warning (EWo) asserts ~10–100 ms before reset (Res) triggers, based on separate thresholds: EWi detects VS decay at 2.35–2.65 V, while Res responds to Vo drop below 4.7–4.9 V (94–98% of nominal). This staggered response enables firmware to save critical data or enter safe state before hard reset occurs.