STMicroelectronics L4989D013TR

Overview

L4989D013TR from STMicroelectronics is an AEC-Q100-qualified automotive 5 V low-dropout linear voltage regulator with integrated reset and programmable watchdog functions, delivering up to 150 mA output current, 180 mV typical dropout at 150 mA, ±3% output voltage accuracy, and operation across 5.6 V–31 V input range - used to power microcontroller core logic in engine control units.

For engineers reviewing the L4989D013TR datasheet, L4989D013TR pinout, L4989D013TR application, or L4989D013TR equivalent, key selection criteria include watchdog enable behavior, reset threshold tolerance (±3%), thermal shutdown at 150 °C, SO-8 package thermal resistance (130–180 °C/W), and compatibility with 1 nF external reset timing capacitor.

Technical Context

The device implements a p-channel MOSFET pass element enabling regulation independent of input transients up to 40 V, with pre-trimmed internal reference ensuring ±3% output voltage accuracy over -40°C to +150°C junction temperature. The reset circuit monitors Vo down to 1 V and triggers within 100–700 µs when Vo falls below 6–10% below nominal.

Watchdog functionality is enabled only when WEn is high and relies on external capacitor Ctw (e.g., 47 nF) to set period (20–80 ms typ); Wi input detects missing pulses via edge-triggered charging/discharging of Ctw between 10–16% and 44–50% of Vo_ref, generating reset if low threshold is reached.

Key Specifications

Pinout & Package

SO-8 surface-mount package with exposed pad for thermal dissipation; 130–180 °C/W junction-to-ambient thermal resistance depending on PCB copper area.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV70733PDRVR and MAX6715AATA+T, L4989D013TR uniquely integrates AEC-Q100 qualification, watchdog + reset, 150°C operation, and 180 mV dropout in SO-8 - making it the sole choice for compact, single-chip MCU supervision in harsh automotive environments.

Availability

L4989D013TR 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 L4989D013TR 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 silicon solutions for automotive, industrial, and consumer markets since 1987.

L4989D013TR belongs to ST's automotive-grade analog power management product line, engineered specifically for robust, integrated voltage regulation and system supervision in engine, chassis, and safety-critical electronic control units.

FAQ

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

The L4989D013TR maintains regulation down to 5.6 V input at 150 mA load, with 180 mV typical dropout - meaning Vo remains stable at 5.0 V as long as VS ≥ 5.18 V. This meets ISO 16750-2 cold-crank requirement for 12 V systems, where battery voltage may dip to 6.0 V.

How does the reset function behave when the watchdog is disabled?

Reset remains fully active regardless of WEn state: Vo threshold detection (6–10% below 5 V), 100–700 µs reaction time, and programmable delay via Vcr capacitor all operate independently. Disabling watchdog only halts Wi monitoring and related Res assertion - not power-supply supervision.

Can the L4989D013TR drive a 200 mA load?

No - absolute maximum output current is internally limited to 290 mA peak but rated continuous output is 150 mA. At 200 mA, thermal shutdown will activate above ~85°C ambient due to SO-8 package limitations (130–180 °C/W). For >150 mA, use L4989MD in SO-20 with lower thermal resistance.

Is an external capacitor required on the Vo pin?

Yes - a minimum 100 nF ceramic capacitor must be placed directly between Vo and GND, as specified in Section 3.1. This stabilizes the control loop and prevents oscillation; omitting it causes output ripple and potential regulator instability, especially under dynamic load changes in automotive environments.