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STMicroelectronics L99VR01STR
- Part No.:
- L99VR01STR
- Manufacturer:
- STMicroelectronics
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
L99VR01STR.pdf
- Description:
- IC REG LIN POS PROG 200MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
L99VR01STR from STMicroelectronics is an AEC-Q100 qualified automotive low-dropout linear voltage regulator delivering up to 200 mA output current with ±2% output voltage accuracy, 1 µA quiescent current in shutdown mode, and 40 V load-dump tolerance. It supports configurable fixed outputs (0.8 V to 5 V) via SELx pins and operates across 2.15 V–28 V input range in battery or post-regulation modes.
For engineers reviewing the L99VR01STR datasheet, L99VR01STR pinout, L99VR01STR application, or L99VR01STR equivalent, key selection considerations include its programmable output voltage selection, thermal warning capability (L99VR01J variant), fast output discharge (75 Ω pull-down), undervoltage lockout thresholds, and dual-package availability (SO-8 / PowerSSO-12) for automotive power domain partitioning.
Technical Context
The L99VR01STR uses a p-channel MOSFET pass element enabling ultra-low dropout voltage (e.g., 500 mV at 150 mA/5 V), while maintaining ±2% output accuracy over −40 °C to +150 °C junction temperature. Its internal pre-trimmed reference and adaptive quiescent current architecture (75 µA at no load, scaling to 3.5 mA at 200 mA) optimize efficiency across wide load conditions.
It integrates enable-controlled startup/shutdown, reset generation with 10%–13.5% VO threshold hysteresis, and fast discharge via internal 75 Ω pull-down resistor. The device supports both direct battery connection and post-regulation use cases, with UVLO thresholds set per output voltage (e.g., 2.4 V rising for 3.3 V output).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | 200 mA max - sufficient to power microcontrollers, CAN transceivers, or sensor signal chains in body control modules. |
| Output voltage accuracy | ±2% - guaranteed over line, load, and temperature; enables direct powering of ASIL-B logic without external trimming. |
| Quiescent current | ≤1 µA (disabled) - meets automotive "always-on" low-power requirements for wake-up circuitry and real-time clocks. |
| Input voltage range | 2.15 V to 28 V DC - supports cold-crank (2.15 V) and load-dump (40 V transient) conditions per ISO 7637-2. |
| Dropout voltage | 500 mV @ 150 mA / 5 V - allows stable regulation even with marginal pre-regulator headroom in multi-rail systems. |
| PSRR | 75 dB @ 1 kHz - suppresses switching noise from upstream DC/DC converters in mixed-signal domains. |
| Reset delay time | 250 µs typical - provides deterministic power-on reset timing for MCU initialization sequences. |
Pinout & Package
Available in SO-8 (standard surface-mount) and PowerSSO-12 (exposed thermal pad) packages. Both support automotive thermal cycling and high-reliability solder joints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VS | Supply voltage input | 40 V tolerant; requires ≥4.7 µF ceramic capacitor directly at pin for stability under load dump. |
| SEL1–SEL3 | Output voltage configuration inputs | Binary-coded selection of eight fixed outputs (0.8 V–5 V); pulled low/high per datasheet truth table. |
| EN | Enable control input | Active-high; forces regulator and reset into shutdown when low, activating 75 Ω fast-discharge path on VO. |
| RST | Reset open-drain output | Pulled low when VO drops >10% below nominal; 250 µs delay ensures clean MCU reset assertion. |
| VO | Regulated output | Requires ≥3.3 µF ceramic capacitor to ground; ESR-insensitive for stability with low-ESR MLCCs. |
| GND | Ground reference | Common return for all analog/digital functions; TAB must be connected to GND in PowerSSO-12. |
| TW | Thermal warning output | Open-drain; asserts low above 150 °C (L99VR01J only); outputs square wave during overvoltage fault. |
| IShort | Short-circuit current programming | Resistor-to-GND sets short-circuit limit (30–100 mA typical); not present in L99VR01S variant. |
Key Features
| Feature | Design Value |
|---|---|
| User-selectable output voltage | Eight factory-trimmed options (0.8 V–5 V) via 3-pin binary code - eliminates external feedback resistors and improves BOM simplicity. |
| Advanced thermal warning | Dedicated TW pin signals junction temperature >150 °C (L99VR01J only) - enables predictive thermal management before shutdown. |
| Fast output discharge | Integrated 75 Ω pull-down activated on EN low - discharges VO within microseconds to prevent back-powering downstream circuits. |
| Programmable short-circuit current | External resistor sets ISHORT from 30 mA to 100 mA (L99VR01J only) - tailors protection to specific load fault profiles. |
| Battery & post-regulation operation | Validated for direct 12 V battery and pre-regulated 5 V/3.3 V rails - simplifies power architecture across ECU domains. |
Applications
| Body Control Module (BCM) | Instrument Cluster |
|---|---|
Use Scenario: Powering microcontroller, LIN transceiver, and LED drivers in door module with battery-direct input. IC Role / Device Role / Timing Role: Primary 3.3 V LDO supplying core logic and communication peripherals; reset output synchronizes MCU boot sequence. Use Value: 40 V load-dump tolerance prevents latch-up during alternator transients; ±2% accuracy ensures ADC reference stability. | Use Scenario: Regulating 5 V rail for TFT display controller and touch interface ASIC in digital dashboard. IC Role / Device Role / Timing Role: Post-regulator fed from 12 V DC/DC converter; VO monitors supply integrity via RST pin. Use Value: Low dropout (500 mV) preserves headroom at low input voltages; PSRR >75 dB suppresses DC/DC switching noise on display power rail. |
| ADAS Camera ECU | Engine Control Unit (ECU) |
Use Scenario: Supplying image sensor and ISP in rear-view camera module operating in high-temperature engine bay. IC Role / Device Role / Timing Role: 1.8 V LDO for sensor analog front-end; TW pin feeds thermal interrupt to host processor. Use Value: Junction temperature monitoring up to 175 °C (L99VR01J) enables safe operation near hot components; fast discharge prevents sensor latch-up during ignition cycles. | Use Scenario: Providing 2.5 V bias to knock sensor amplifier and 5 V to injector driver logic in gasoline ECU. IC Role / Device Role / Timing Role: Dual-output configuration (via two L99VR01STRs) isolates analog and digital domains; EN pin enables synchronized power sequencing. Use Value: Configurable SELx pins allow identical PCB layout for multiple voltage rails; UVLO thresholds match engine cranking profile (2.15 V min). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCP1117ST50T3G | Fixed 5 V output only; no SELx configuration; 1.2 V dropout @ 1 A; no thermal warning or reset output. | Targeted at non-safety-critical consumer-grade 5 V rails; lacks AEC-Q100 qualification and automotive diagnostics. | Select only for cost-sensitive non-automotive designs where programmability and diagnostics are unnecessary. |
| TLE42744G | Fixed 5 V output; integrated watchdog timer; higher 250 mA output; no user-configurable voltage or ISHORT programming. | Designed for safety-critical ASIL-B applications with built-in supervision; lacks voltage flexibility and thermal warning granularity. | Prefer for systems requiring watchdog functionality and higher current, but accept fixed 5 V and reduced configurability. |
Compared with NCP1117ST50T3G and TLE42744G, the L99VR01STR uniquely combines voltage configurability, diagnostic outputs (RST/TW), and ultra-low quiescent current-making it optimal for modular, multi-voltage automotive ECUs where BOM consolidation and functional safety support are critical.
Availability
L99VR01STR is available at Aetrix Electronics and suitable for body control modules, instrument clusters, ADAS camera ECUs, and engine control units requiring stable component supply across automotive production lifecycles.
Supply support for L99VR01STR 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 deep expertise in AEC-Q100-qualified analog and power devices.
The L99VR01STR belongs to ST's automotive LDO family designed specifically for demanding power domains in modern vehicles-including body electronics, infotainment, and ADAS-where precision, reliability, and integrated diagnostics are mandatory.
FAQ
What package variants are offered for L99VR01STR?
L99VR01STR is supplied in SO-8 (standard plastic) and PowerSSO-12 (thermally enhanced with exposed pad) packages. Both are RoHS-compliant, halogen-free, and qualified per AEC-Q100 Grade 0 (−40 °C to +150 °C junction). The PowerSSO-12 variant offers lower thermal resistance (27.4 °C/W vs. 71 °C/W for SO-8), enabling higher ambient operation in compact enclosures.
How does the SELx pin configuration map to output voltage?
SEL1–SEL3 form a 3-bit binary code: SEL1 = LSB, SEL3 = MSB. For example, SEL1=0/SEL2=0/SEL3=0 selects 0.8 V; SEL1=1/SEL2=1/SEL3=1 selects 5 V. All combinations are defined in Table 5 of DS13649 Rev 5, with output tolerances tightened to ±2% across temperature, line, and load variations.
Is thermal warning (TW) available on all L99VR01STR units?
No-thermal warning output is exclusive to the L99VR01J variant. The L99VR01STR part number corresponds to the standard version (L99VR01S), which lacks TW, IShort programming, and extended 175 °C operation. Customers requiring thermal diagnostics must specify L99VR01JTR instead.
What is the minimum input capacitance required for stable operation?
A minimum 4.7 µF X7R ceramic capacitor must be placed directly at the VS pin, with an additional 100 nF capacitor in parallel. This dual-capacitor structure ensures stability during load dump transients and maintains regulation down to 2.15 V input. The 4.7 µF value is validated per TDK C5750X7R2A475M230KA specification in the datasheet.
L99VR01STR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Programmable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 0.8V, 1.2V, 1.5V, 1.8V, 2.5V, 2.8V, 3.3V, 5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.53V @ 200mA
- Current - Output:
- 200mA
- Current - Quiescent (Iq):
- 100 µA
- Current - Supply (Max):
- 3.5 mA
- PSRR:
- 75dB (1kHz)
- Control Features:
- Enable, Reset, Watchdog
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
L99VR01STR FAQ
1.How can I place an order for L99VR01STR through Aetrix?
Please submit a Request for Quotation (RFQ) for L99VR01STR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for L99VR01STR reliable?
The price and inventory of L99VR01STR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L99VR01STR is usually 5 days.
3.What payment methods are accepted for L99VR01STR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L99VR01STR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for L99VR01STR?
L99VR01STR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your L99VR01STR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for L99VR01STR?
For technical support, including L99VR01STR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L99VR01STR requirements.
6.How does Aetrix verify that L99VR01STR is sourced from the original manufacturer or authorized distributors?
All L99VR01STR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that L99VR01STR meets industry standards.
7.What is the process for return or replacement of L99VR01STR?
All L99VR01STR units undergo pre-shipment inspection (PSI). If there is an issue with L99VR01STR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The L99VR01STR part is unused and in its original packaging.
Return procedure for L99VR01STR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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