STMicroelectronics L5150CJ

Overview

L5150CJ from STMicroelectronics is an AEC-Q100 qualified automotive-grade 5 V low-dropout linear regulator with integrated power-on reset, adjustable low-voltage reset, and early warning functions. It delivers 150 mA output current, maintains ±2% output voltage accuracy over −40 °C to 150 °C junction temperature, and operates from 5.6 V to 40 V input supply - enabling use in 12 V/24 V vehicle battery systems with cold-crank tolerance.

For engineers reviewing the L5150CJ datasheet, L5150CJ pinout, L5150CJ application, or L5150CJ equivalent, this device serves as a system-supply regulator with fault monitoring for microcontroller-based automotive ECUs, body control modules, and ADAS domain controllers requiring high reliability, thermal robustness, and precise reset timing under wide input transients.

Technical Context

The L5150CJ integrates a p-channel MOSFET pass element for ultra-low dropout (≤500 mV at 150 mA), enabling stable regulation even during engine cranking (VS down to 5.6 V). Its internal bandgap reference and on-chip trimming ensure ±2% output accuracy across line, load, and temperature (−40 °C to 150 °C).

Three independent monitoring circuits operate concurrently: a reset generator with externally programmable delay (via capacitor on Vcr), an adjustable reset threshold (down to 3.5 V via Res_Adj voltage divider), and an early warning comparator (EWi/EWo) that signals input voltage sag before reset activation - all with hysteresis and guaranteed timing behavior per AEC-Q100.

Key Specifications

Pinout & Package

Package: PowerSSO-12 (exposed thermal pad, wettable flank); RoHS-compliant, AEC-Q100 qualified.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NCP380LSN33T2G and TLE42754G, the L5150CJ uniquely combines adjustable reset threshold, early warning signaling, and PowerSSO-12 thermal performance - making it optimal for next-generation automotive ECUs where predictive fault handling and high-temperature operation are required.

Availability

L5150CJ is available at Aetrix Electronics and suitable for automotive electronic control units, ADAS camera modules, and electric power steering systems requiring stable component supply with full AEC-Q100 traceability and long-term production support.

Supply support for L5150CJ 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 over 30 years of automotive qualification expertise and ISO/TS 16949-certified manufacturing.

The L5150CJ belongs to ST's L5150 automotive LDO family, designed specifically for demanding vehicle subsystems requiring high-temperature resilience, precise reset behavior, and integrated system supervision - replacing discrete reset IC + LDO solutions.

FAQ

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

The L5150CJ maintains regulation down to VS = Vo + Vdp = 5.0 V + 0.5 V = 5.5 V at 150 mA, verified per Figure 5 (Drop voltage vs. output current) and Table 5 (Vdp ≤ 500 mV). At 5.6 V input, it delivers full 150 mA with 4.9 V output - sufficient for cold-crank operation in 12 V systems.

Can the reset threshold be set below 3.5 V?

No. The Res_Adj pin's internal reference and comparator architecture limit the adjustable reset threshold to a minimum of 3.5 V, as specified in the "Description" section and confirmed by Res_Adj voltage range (0.4–1.3 V) and Vo_th min (6% below Vo_ref = 4.7 V) in Table 6. Setting lower would violate internal comparator headroom.

Is an external capacitor required on the Vcr pin for basic reset functionality?

No. The Vcr pin may be left open for immediate reset assertion upon Vo undervoltage. However, connecting a capacitor (1000 pF typical) introduces a programmable delay (2–11 ms) to suppress false resets during transient dips - as shown in Figure 24 and Table 6 (Trd).

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

The EWi/EWo circuit monitors VS independently of Vo and asserts EWo low when input voltage falls below 2.5 V ±70 mV - typically 10–100 ms before Vo drops below reset threshold. This provides firmware time to save state or enter low-power mode before hard reset occurs, as detailed in Figure 25 and Section 3.3.