STMicroelectronics L5150CJTR

Overview

L5150CJTR from STMicroelectronics is an AEC-Q100 qualified automotive-grade 5 V low-dropout linear voltage regulator with integrated power-on reset, adjustable low-voltage reset, and early warning functions. It delivers 150 mA output current, maintains ±2% output accuracy over −40 °C to +150 °C junction temperature, supports 5.6 V–40 V input range, and features 55 µA typical quiescent current at light load - used in engine control units (ECUs) for stable microcontroller supply under wide battery voltage transients.

For engineers reviewing the L5150CJTR datasheet, L5150CJTR pinout, L5150CJTR application, or L5150CJTR equivalent, key selection criteria include its programmable reset delay via external capacitor, adjustable reset threshold down to 3.5 V, early warning input monitoring of VS, thermal shutdown behavior at 150 °C, and compatibility with low-ESR ceramic output capacitors ≥220 nF.

Technical Context

The device integrates a p-channel MOSFET pass element enabling dropout voltage as low as 500 mV at 150 mA while maintaining regulation up to 40 V input. Its internal bandgap reference and on-chip trimming ensure ±2% output voltage accuracy across line, load, and temperature (−40 °C to +150 °C).

Three dedicated supervision circuits operate independently: a reset generator with externally adjustable threshold (via Res_Adj pin and voltage divider), a capacitor-timed reset delay (Vcr pin), and an early warning comparator (EWi/EWo pins) that signals input voltage sag before reset activation - all implemented without external active components.

Key Specifications

Pinout & Package

Package: PowerSSO-12 (exposed thermal pad), RoHS-compliant, moisture sensitivity level 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NCP380LSN33T2G and TLV73350PDBVR, L5150CJTR uniquely integrates adjustable reset, early warning, and AEC-Q100 Grade 0 qualification in a single PowerSSO-12 package - reducing component count, PCB area, and validation effort for ASIL-B–capable systems.

Availability

L5150CJTR is available at Aetrix Electronics and suitable for engine control units, body control modules, ADAS camera ECUs, and transmission control units requiring stable component supply across automotive production lifecycles.

Supply support for L5150CJTR 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.

L5150CJTR belongs to ST's automotive LDO portfolio engineered specifically for power-supply supervision in harsh-temperature, high-reliability vehicle subsystems - emphasizing integration of reset, early warning, and thermal protection without external components.

FAQ

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

The L5150CJTR maintains regulation down to 5.6 V input at full 150 mA load, corresponding to a maximum dropout of 500 mV (5.6 V − 5.1 V). This meets ISO 16750-2 cold-crank specification where battery voltage may dip to 6.0 V - the device sustains valid 5 V output even at 5.6 V input due to its p-channel MOSFET architecture and precision reference.

Can the reset threshold be set below 3.5 V?

No - the datasheet specifies 3.5 V as the absolute lower limit for reset threshold adjustment via the Res_Adj pin. This is enforced by internal circuitry limiting the Res_Adj voltage range to 0.4 V–1.3 V, which maps to Vo thresholds of 3.5 V–5.5 V using standard resistor divider equations. Attempting to set lower thresholds results in undefined reset behavior.

Is the exposed thermal pad (TAB) electrically connected to any internal node?

Yes - the TAB is internally connected to the silicon substrate and must be soldered to a PCB ground plane for both thermal performance and electrical safety. ST's layout guidelines specify connecting TAB to GND; leaving it floating degrades thermal resistance by >30% and risks latch-up under ESD events due to uncontrolled substrate bias.

Does the early warning function remain active during thermal shutdown?

Yes - the early warning comparator (EWi/EWo) operates independently of the voltage regulator core and remains functional during thermal shutdown. As long as VS is within 5.6 V–40 V and T_j < 150 °C, EWo will assert low when EWi falls below 2.35 V, providing actionable warning even as the regulator output is disabled - critical for initiating controlled shutdown before thermal fault escalation.