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STMicroelectronics LF50ABV-DG
- Part No.:
- LF50ABV-DG
- Manufacturer:
- STMicroelectronics
- Package:
- TO-220-3
- Datasheet:
-
LF50ABV-DG.pdf
- Description:
- IC REG LINEAR 5V 500MA TO220
- Quantity:
- Payment:
- Shipping:
Inventory:1,724
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Product details
Overview
LF50ABV-DG from STMicroelectronics is a 5.0 V, ±1% automotive-grade low-dropout linear regulator in DPAK package, delivering up to 500 mA output current with 0.4 V dropout at 500 mA and 50 µA quiescent current in shutdown mode. It features logic-controlled inhibit (TTL-compatible), internal thermal/current protection, and stable operation with only 2.2 µF output capacitance - designed for engine control units and ADAS power rails.
For engineers reviewing the LF50ABV-DG datasheet, LF50ABV-DG pinout, LF50ABV-DG application, or LF50ABV-DG equivalent, key selection criteria include its AEC-Q100 qualification, -40 °C to 125 °C operating junction temperature, 76 dB supply rejection at 120 Hz, and precise 5.0 V ±1% output tolerance across automotive temperature extremes.
Technical Context
The LF50ABV-DG implements a PNP pass transistor architecture enabling ultra-low dropout (0.4 V typ. at 500 mA) and high PSRR (76 dB @ 120 Hz). Its inhibit input (pin 2) accepts TTL-level logic signals to enable/disable regulation without external circuitry.
Thermal protection activates at ~165 °C junction temperature, and current limiting holds output at ~1 A during overload. The device operates with input voltages from 6 V to 16 V and maintains regulation down to VI = VO + Vd, supporting start-stop battery systems where input may dip to 6.3 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | 5.0 V ±1% at 25 °C; maintains regulation over -40 °C to 125 °C junction range |
| Dropout voltage | 0.4 V max at 500 mA load - enables operation with minimal headroom in 12 V automotive systems |
| Quiescent current | 50 µA in OFF mode; 500 µA typ. in ON mode - extends battery life in always-on vehicle modules |
| Output current | 500 mA continuous; internally limited to 1 A - supports microcontroller, sensor, and CAN transceiver rails |
| PSRR | 76 dB @ 120 Hz - suppresses alternator ripple and switching noise on shared 12 V bus |
| Stability capacitor | 2.2 µF ceramic (ESR 0.1–10 Ω) - reduces BOM cost and PCB area vs. traditional 10–22 µF electrolytics |
| Operating temp | -40 °C to 125 °C junction - qualified per AEC-Q100 Grade 1 for under-hood applications |
Pinout & Package
DPAK (TO-252-3) package with exposed thermal pad electrically connected to GND; thermally optimized for PCB copper pour mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input voltage supply | Accepts 6–16 V DC; must be decoupled with ≥0.1 µF ceramic near pin |
| 2 (INH) | Inhibit control input | TTL-compatible logic: <0.8 V = OFF (regulator disabled), >2.0 V = ON (regulation active) |
| 3 (GND) | Ground reference | Common return for IN, INH, and OUT; connects to exposed thermal pad |
| 4 (OUT) | Regulated output | Delivers stable 5.0 V ±1%; requires 2.2 µF ceramic capacitor to ground |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for automotive use with PAT/SYL/SBL statistical testing and -40 °C to 125 °C operation |
| Logic-controlled shutdown | Direct TTL-level inhibit input eliminates need for level-shifting or external MOSFET switches |
| Low-noise regulation | 50 µV RMS output noise (10 Hz–100 kHz) - suitable for analog sensors and precision ADC references |
| Robust protection | Integrated thermal foldback and current limiting prevent damage during sustained overload or short-circuit |
| Minimal external components | Stable with only 2.2 µF output capacitor - reduces board space and improves reliability vs. larger electrolytics |
Applications
| Engine Control Unit (ECU) Core Power | ADAS Camera Module Supply |
|---|---|
Use Scenario: Powers 32-bit MCU, CAN controller, and analog front-end in gasoline/diesel ECU under hood. IC Role / Device Role / Timing Role: Primary 5 V local regulator supplying critical safety-critical logic and interface circuits. Use Value: AEC-Q100 qualification and 125 °C operation ensure reliability during prolonged high-temperature engine runtime. | Use Scenario: Supplies image sensor, ISP, and serializer in forward-facing ADAS camera with wake-on-event capability. IC Role / Device Role / Timing Role: Inhibit-controlled LDO enabling low-power standby (<50 µA) and fast wake-up (<10 µs) for event-triggered imaging. Use Value: Ultra-low shutdown current extends parking-mode battery life; 76 dB PSRR rejects ignition noise coupling into image data path. |
| Automotive Infotainment SoC I/O Rail | Body Control Module (BCM) Sensor Interface |
Use Scenario: Provides clean 5 V supply to HDMI PHY, USB transceivers, and audio codecs in head unit. IC Role / Device Role / Timing Role: Noise-sensitive post-regulator filtering stage after buck converter, reducing switching artifacts. Use Value: 50 µV output noise and 76 dB PSRR prevent audible buzz in audio outputs and pixel jitter in video streams. | Use Scenario: Powers door lock actuators, ambient light sensors, and LIN transceivers in distributed BCM nodes. IC Role / Device Role / Timing Role: Local point-of-load regulator with integrated inhibit for zone-based power gating. Use Value: Logic-controlled shutdown allows individual subsystem isolation without software intervention or additional FETs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV73350PDBVR | 300 mA output, 170 mV dropout at 300 mA, no AEC-Q100 rating | Designed for consumer/portable; lacks automotive qualification and thermal robustness | Select only for non-automotive designs where 500 mA and AEC-Q100 are not required |
| NCP1117ST50T3G | 1 A output, 1.2 V dropout at 800 mA, ±2% tolerance, no inhibit function | Industrial-grade only; lacks shutdown control and tight 1% tolerance needed for MCU core rails | Choose when higher current and lower cost are prioritized over automotive compliance and logic control |
Compared with TLV73350PDBVR and NCP1117ST50T3G, the LF50ABV-DG uniquely combines AEC-Q100 Grade 1 qualification, 500 mA capability, 1% output accuracy, and TTL-compatible inhibit - making it the only drop-in solution for safety-critical automotive LDO applications requiring all four attributes.
Availability
LF50ABV-DG is available at Aetrix Electronics and suitable for engine control units, ADAS camera modules, and infotainment system power rails requiring stable component supply across automotive production lifecycles.
Supply support for LF50ABV-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, specializing in automotive, industrial, and power management ICs.
The LFXX series was developed specifically for automotive power management, targeting AEC-Q100-compliant LDO applications in harsh under-hood environments with stringent noise, efficiency, and reliability requirements.
FAQ
What is the maximum input voltage for LF50ABV-DG?
The absolute maximum DC input voltage is 40 V, but regulation is guaranteed only between 6 V and 16 V. Input voltages above 18 V force the device into shutdown mode per datasheet Table 1, making 16 V the practical upper limit for normal operation.
Does LF50ABV-DG require an input bypass capacitor?
Yes - a minimum 0.1 µF ceramic capacitor must be placed as close as possible to the IN pin and GND. This stabilizes the input impedance and prevents oscillation during transient load steps, especially critical in automotive environments with long harness inductance.
Can LF50ABV-DG be used without the inhibit function?
Yes - tie the INH pin to VIN (via ≤10 kΩ resistor) to permanently enable regulation. The device will operate identically to the 3-pin variant (e.g., LF50ABV), retaining all electrical specs including dropout, PSRR, and thermal protection.
Is the exposed thermal pad on the DPAK package electrically connected?
Yes - the exposed thermal pad is internally connected to GND and must be soldered to a PCB GND plane for both thermal performance and electrical integrity. Failure to connect it degrades thermal resistance by >30 °C/W and risks instability due to ground loop impedance.
LF50ABV-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
LF50ABV-DG FAQ
1.How can I place an order for LF50ABV-DG through Aetrix?
Please submit a Request for Quotation (RFQ) for LF50ABV-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 LF50ABV-DG reliable?
The price and inventory of LF50ABV-DG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF50ABV-DG is usually 5 days.
3.What payment methods are accepted for LF50ABV-DG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF50ABV-DG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LF50ABV-DG?
LF50ABV-DG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LF50ABV-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 LF50ABV-DG?
For technical support, including LF50ABV-DG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF50ABV-DG requirements.
6.How does Aetrix verify that LF50ABV-DG is sourced from the original manufacturer or authorized distributors?
All LF50ABV-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 LF50ABV-DG meets industry standards.
7.What is the process for return or replacement of LF50ABV-DG?
All LF50ABV-DG units undergo pre-shipment inspection (PSI). If there is an issue with LF50ABV-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 LF50ABV-DG part is unused and in its original packaging.
Return procedure for LF50ABV-DG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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