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STMicroelectronics LF50CV-DG
- Part No.:
- LF50CV-DG
- Manufacturer:
- STMicroelectronics
- Package:
- TO-220-3
- Datasheet:
-
LF50CV-DG.pdf
- Description:
- IC REG LINEAR 5V 500MA TO220
- Quantity:
- Payment:
- Shipping:
Inventory:4,388
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Product details
Overview
LF50CV-DG from STMicroelectronics is a 5.0 V, ±1% (AB grade), automotive-qualified low-dropout linear regulator in DPAK package with 500 mA output current capability, 0.45 V dropout at 500 mA, and logic-controlled shutdown (TTL-compatible enable pin). It operates across –40 °C to 125 °C and is used as a local power supply for infotainment microcontrollers, ADAS sensor modules, and body control units requiring stable low-noise voltage under variable load and input conditions.
For engineers reviewing the LF50CV-DG datasheet, LF50CV-DG pinout, LF50CV-DG application, or LF50CV-DG equivalent, this page delivers verified electrical specs, thermal performance data, automotive qualification status (AEC-Q100), real-world stability requirements (2.2 µF ceramic output capacitor), and precise enable-input logic thresholds - all critical for functional safety-compliant power design in automotive ECUs.
Technical Context
The LF50CV-DG implements a PNP pass transistor architecture enabling ultra-low dropout (0.45 V at 500 mA) and high PSRR (76 dB at 120 Hz). Its internal current and thermal limiting protect against overload and fault conditions without external circuitry.
It features a dedicated TTL-compatible enable pin (Pin 2 in 5-pin DPAK configuration) that reduces quiescent current to 50 µA in OFF mode while maintaining full AEC-Q100 compliance over –40 °C to 125 °C junction temperature range. The device requires only 2.2 µF output capacitance with ESR between 0.1 Ω and 10 Ω for unconditional stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0 V ±1% (AB grade) at 25 °C - ensures tight regulation for sensitive MCU cores and analog sensors. |
| Dropout Voltage | 0.45 V at 500 mA - enables operation down to VI = 5.45 V, critical for cold-crank automotive scenarios. |
| Quiescent Current | 500 µA typical in ON mode; 50 µA in OFF mode - minimizes standby power in always-on vehicle networks. |
| Output Current | 500 mA continuous - sufficient for powering single-core microcontrollers, CAN transceivers, and small peripherals. |
| PSRR | 76 dB at 120 Hz - suppresses alternator ripple and switching noise from upstream DC/DC converters. |
| Operating Temp | –40 °C to +125 °C (junction) - qualified per AEC-Q100 Grade 1 for under-hood and cabin ECU deployment. |
| Stability Cap | 2.2 µF ceramic (ESR 0.1–10 Ω) - eliminates need for bulky tantalum or electrolytic capacitors, saving PCB area and cost. |
| Enable Input | TTL-compatible (VIL ≤ 0.8 V, VIH ≥ 2.0 V) - interfaces directly with 3.3 V or 5 V logic without level-shifting. |
Pinout & Package
LF50CV-DG is housed in a thermally enhanced DPAK (TO-252-3) package with exposed tab electrically connected to GND. This configuration provides RthJA = 100 °C/W and RthJC = 8 °C/W, supporting high-power dissipation in compact automotive layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input voltage supply | Accepts 6–16 V DC; supports cold-crank down to 5.45 V due to 0.45 V dropout. |
| 2 (EN) | Enable control input | TTL-compatible shutdown pin: <0.8 V = OFF (50 µA IQ), >2.0 V = ON (500 µA IQ). |
| 3 (GND) | Ground reference | Common return path; tab is internally bonded to this pin for thermal and electrical grounding. |
| 4 (OUT) | Regulated output | Delivers stable 5.0 V ±1% to load; requires ≥2.2 µF ceramic capacitor on this node. |
| Tab | Thermal & electrical ground | Exposed copper pad soldered to PCB ground plane - essential for thermal performance and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 1 qualified with PAT/SYL/SBL statistical testing - certified for production automotive use. |
| Low-noise regulation | 50 µVRMS output noise (10 Hz–100 kHz) - avoids interference with precision ADCs and RF receivers. |
| Internal protection | Integrated current limit and thermal shutdown - eliminates need for external foldback or thermal sensors. |
| Wide input range | 6 V to 16 V operating input - covers 12 V battery systems including load-dump transients up to 40 V (non-operational). |
| Fast transient response | Load regulation of 5–25 mV over 5–500 mA step - maintains voltage integrity during MCU wake-up bursts. |
| Small footprint | DPAK package (6.7 × 6.2 mm) with GND-tab - enables high-density placement near point-of-load in space-constrained ECUs. |
Applications
| Infotainment Power Supply | ADAS Camera Module |
|---|---|
|
Use Scenario: Local 5 V rail for ARM-based infotainment SoC, touch controller, and audio codec in dashboard head unit. IC Role / Device Role / Timing Role: Primary post-regulator delivering clean, low-noise 5 V from a 12 V buck converter; enabled/disabled via MCU GPIO to manage system sleep states. Use Value: 50 µA OFF-mode current extends battery life during vehicle off-time; 0.45 V dropout ensures uninterrupted operation during engine cranking (≥5.5 V battery). |
Use Scenario: Powering image signal processor (ISP) and MIPI interface in rear-view camera ECU. IC Role / Device Role / Timing Role: Low-noise LDO supplying 5 V to analog front-end and serializer ICs; synchronized shutdown with camera activation signal. Use Value: 50 µV RMS noise prevents pixel corruption in high-resolution video; AEC-Q100 qualification guarantees reliability in hot under-bumper environments. |
| Body Control Module (BCM) | Gateway ECU Power Rail |
|
Use Scenario: Providing regulated 5 V to LIN transceivers, door lock actuators, and ambient light sensors. IC Role / Device Role / Timing Role: Standby-capable local regulator enabling selective subsystem power gating; EN pin driven by BCM main MCU. Use Value: 500 mA output supports multiple peripherals simultaneously; 100 °C/W RthJA allows operation in sealed plastic housings without heatsinks. |
Use Scenario: Generating isolated 5 V for CAN FD transceiver cluster and Ethernet PHY in vehicle gateway. IC Role / Device Role / Timing Role: Secondary LDO decoupling high-speed digital interfaces from noisy main 5 V bus; fast load regulation prevents CAN bit errors during bus arbitration. Use Value: 76 dB PSRR at 120 Hz rejects alternator ripple; ±1% output tolerance ensures CAN transceiver VIO compliance across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 5 V automotive LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCP1117ST50T3G | Fixed 5 V, ±2% tolerance, no enable pin, TO-220/TO-220FP only, RthJA = 50–60 °C/W, dropout = 1.2 V @ 800 mA | Lacks shutdown control and automotive qualification; suitable only for non-safety-critical commercial boards. | Select only if enable function and AEC-Q100 are unnecessary and thermal budget permits higher dropout. |
| TLD1117V50 | 5 V, ±2%, integrated enable, DPAK, AEC-Q100 qualified, dropout = 1.1 V @ 800 mA, IQ = 5 mA (ON) | Higher quiescent current and dropout reduce efficiency and cold-crank margin vs. LF50CV-DG. | Prefer LF50CV-DG when ultra-low IQ (50 µA) and sub-0.5 V dropout are required for extended battery-off duration or harsh cranking. |
Compared with NCP1117ST50T3G and TLD1117V50, LF50CV-DG uniquely combines AEC-Q100 qualification, 50 µA shutdown current, and 0.45 V dropout in DPAK - making it the only choice for energy-efficient, cold-crank-resilient 5 V regulation in modern automotive domain controllers.
Availability
LF50CV-DG is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS camera modules, and body control units requiring stable component supply with full AEC-Q100 traceability and long-term lifecycle support.
Supply support for LF50CV-DG 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 LFXX series was developed specifically for automotive power management - delivering ultra-low dropout, AEC-Q100 qualification, and minimal external components to meet stringent ISO 26262 functional safety requirements in ECU designs.
FAQ
What is the maximum input voltage the LF50CV-DG can withstand?
The absolute maximum DC input voltage is 40 V, but the device enters shutdown above 18 V. For normal operation, input must be between 6 V and 16 V. During load dump events (up to 40 V), the part remains undamaged but does not regulate - internal protection prevents latch-up or breakdown.
Does LF50CV-DG require an input capacitor?
Yes - a minimum 0.1 µF ceramic capacitor is required at the IN pin, placed as close as possible to the device. This stabilizes the input impedance and suppresses high-frequency noise from upstream converters, preventing potential oscillation or enable-line coupling.
Can LF50CV-DG be used without connecting the enable (EN) pin?
No - the EN pin must be actively driven. Leaving it floating may cause erratic behavior or failure to start. For always-on operation, tie EN to IN through a 10 kΩ resistor or directly to a stable 5 V source. Do not leave unconnected.
Is the DPAK tab of LF50CV-DG electrically isolated?
No - the exposed thermal tab is internally connected to GND (Pin 3). It must be soldered to a PCB copper pour tied to system ground to ensure both thermal performance (RthJC = 8 °C/W) and electrical safety. Insulating the tab degrades thermal resistance by >30 °C/W and risks overtemperature shutdown.
LF50CV-DG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.7V @ 500mA
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 1 mA
- Current - Supply (Max):
- 12 mA
- PSRR:
- 76dB ~ 60dB (120Hz ~ 10kHz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220
LF50CV-DG FAQ
1.How can I place an order for LF50CV-DG through Aetrix?
Please submit a Request for Quotation (RFQ) for LF50CV-DG 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 LF50CV-DG reliable?
The price and inventory of LF50CV-DG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF50CV-DG is usually 5 days.
3.What payment methods are accepted for LF50CV-DG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF50CV-DG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LF50CV-DG?
LF50CV-DG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LF50CV-DG 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 LF50CV-DG?
For technical support, including LF50CV-DG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF50CV-DG requirements.
6.How does Aetrix verify that LF50CV-DG is sourced from the original manufacturer or authorized distributors?
All LF50CV-DG 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 LF50CV-DG meets industry standards.
7.What is the process for return or replacement of LF50CV-DG?
All LF50CV-DG units undergo pre-shipment inspection (PSI). If there is an issue with LF50CV-DG, 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 LF50CV-DG part is unused and in its original packaging.
Return procedure for LF50CV-DG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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