STMicroelectronics L99VR01JTR

Overview

L99VR01JTR from STMicroelectronics is an AEC-Q100 qualified automotive low-dropout linear voltage regulator in PowerSSO-12 package, delivering up to 200 mA output current with ±2% output voltage accuracy, 1 µA quiescent current when disabled, and 40 V load-dump tolerance. It supports battery- or post-regulated operation and provides configurable fixed outputs (0.8 V to 5 V) for microcontroller core/logic supply in engine control units.

For engineers reviewing the L99VR01JTR datasheet, L99VR01JTR pinout, L99VR01JTR application, or L99VR01JTR equivalent, key selection criteria include programmable short-circuit current, advanced thermal warning output, wide junction temperature range (−40 °C to 175 °C), and reset output with 10%–13.5% undervoltage threshold hysteresis.

Technical Context

The L99VR01JTR uses a p-channel MOSFET pass element enabling low dropout (≤530 mV at 200 mA, VO = 3.3 V) and high PSRR (75 dB at 1 kHz). Its internal pre-trimmed voltage reference ensures ±2% output accuracy across −40 °C to 175 °C junction temperature, line (2.15 V–28 V input), and load (1–200 mA) variations.

It integrates dual diagnostics: thermal warning (TW pin asserts low at 140–165 °C, toggles square wave on overvoltage) and reset (RST pin pulls low when VO drops >6.5–13.5% below nominal). The Ishort pin enables resistor-programmable short-circuit current (30–100 mA typical), while EN controls regulator enable/disable and fast discharge via 75 Ω internal pull-down.

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 regulator applications.

Compared with TLV73333PDBVR and NCP114AMX330T2G, the L99VR01JTR uniquely combines programmable output, ASIL-aware diagnostics (TW/RST/IShort), and 175 °C operation-enabling single-chip compliance with ISO 26262 hardware safety requirements in powertrain domains.

Availability

L99VR01JTR is available at Aetrix Electronics and suitable for engine control units, body control modules, ADAS camera ECUs, and electric power steering control units requiring stable component supply across automotive production lifecycles.

Supply support for L99VR01JTR 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.

The L99VR01JTR belongs to ST's automotive power management portfolio, engineered specifically for functional safety-critical voltage regulation in ASIL-B/C systems where diagnostics, thermal resilience, and load-dump robustness are mandatory.

FAQ

What is the function of the TW pin on L99VR01JTR?

The TW (Thermal Warning) pin is an open-drain output that pulls low when junction temperature exceeds 140–165 °C, providing early overtemperature alert before thermal shutdown. During output overvoltage events, it generates a 250 µs square wave for fault identification. It must be pulled up externally with ≥4.7 kΩ to VO; leaving it floating disables the feature.

How is the short-circuit current programmed using the IShort pin?

A resistor between IShort pin and GND sets the short-circuit current limit: typical values range from 30 mA (R = 10 kΩ) to 100 mA (R = 1 kΩ). With IShort floating, the device defaults to higher internal limit (240–480 mA). Resistor value must be selected per Table 5 A.010/A.011 and verified across temperature.

Can L99VR01JTR operate directly from a 12 V battery without pre-regulation?

Yes. The L99VR01JTR supports direct battery connection with input range 2.15 V–28 V DC and 40 V transient tolerance. Its low dropout (≤530 mV) enables stable 3.3 V/5 V output even during cold-crank (6.5 V minimum battery). External input capacitance (≥4.7 µF ceramic) is mandatory for transient immunity.

What is the purpose of the T1 and T2 test pins on the PowerSSO-12 package?

T1 and T2 are reserved for factory testing and must be connected externally: T1 to VO and T2 to GND per datasheet Figure 3. They are not functional in application circuits and have no electrical role during normal operation; incorrect connection may impair device reliability or invalidate AEC-Q100 qualification.