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STMicroelectronics LF50ABP
- Part No.:
- LF50ABP
- Manufacturer:
- STMicroelectronics
- Package:
- TO-220-3 Full Pack
- Datasheet:
-
LF50ABP.pdf
- Description:
- IC REG LINEAR 5V 500MA TO220FP
- Quantity:
- Payment:
- Shipping:
Inventory:1,392
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Product details
Overview
LF50ABP from STMicroelectronics is a 5.0 V, ±1% tolerance, automotive-grade low-dropout linear regulator in PPAK package with logic-controlled shutdown, 500 mA output current capability, 0.4 V typical dropout at 500 mA, and operation over −40 °C to +125 °C. It serves as a local power supply for engine control units, body electronics, and ADAS sensors requiring stable low-noise voltage under variable load and input conditions.
For engineers reviewing the LF50ABP datasheet, LF50ABP pinout, LF50ABP application, or LF50ABP equivalent, this page delivers verified technical context, exact pin functions, real-world use cases in automotive subsystems, and validated alternative parts with documented functional trade-offs.
Technical Context
The LF50ABP implements a PMOS pass transistor architecture enabling ultra-low dropout (0.4 V at 500 mA) and high PSRR (76 dB at 120 Hz). Its internal bandgap reference and error amplifier deliver tight output regulation across temperature and line/load variations.
It integrates TTL-compatible enable logic (pin 2), thermal shutdown, and current limiting. The device requires only a 2.2 µF ceramic output capacitor with ESR between 0.1 Ω and 10 Ω for stability-no external compensation needed.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0 V ±1% at 25 °C; maintains regulation across −40 °C to +125 °C for automotive ECU power rails. |
| Dropout Voltage | 0.4 V max at 500 mA load; enables operation with VIN as low as 5.4 V while sustaining full output. |
| Quiescent Current | 500 µA typical in ON mode; 50 µA in OFF mode-critical for always-on vehicle modules with battery drain constraints. |
| PSRR | 76 dB at 120 Hz; suppresses ripple from noisy 12 V battery/alternator sources before sensitive analog or MCU circuits. |
| Output Current | 500 mA continuous; supports multiple downstream ICs (e.g., CAN transceivers, sensor interfaces) from single LDO. |
| Enable Logic | TTL-compatible (VIL ≤ 0.8 V, VIH ≥ 2.0 V); allows direct interfacing with microcontroller GPIO without level-shifting. |
| Stability Capacitor | 2.2 µF ceramic (ESR 0.1–10 Ω); reduces BOM count and PCB area vs. traditional 10–22 µF tantalum solutions. |
Pinout & Package
LF50ABP is housed in a thermally enhanced PPAK-5 (Power Package) with exposed thermal pad electrically connected to GND. This package provides RthJA = 100 °C/W and RthJC = 8 °C/W, enabling high-power dissipation in compact automotive layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 – IN | Input voltage supply | Accepts 6–16 V DC; withstands transient spikes per ISO 7637-2 when used with appropriate input protection. |
| 2 – EN | Enable control input | Active-high TTL-compatible logic input; pulls internal pass transistor gate to disable output (IQ = 50 µA). |
| 3 – GND | Ground reference | Common return for input, output, and enable; tied to exposed thermal pad for optimal heat transfer. |
| 4 – OUT | Regulated output | Delivers stable 5.0 V ±1% to load; requires ≥2.2 µF ceramic capacitor placed within 5 mm of pin. |
| 5 – TAB | Thermal pad / GND | Electrically connected to GND; must be soldered to large copper pour for thermal performance and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Qualified to Grade 1 (−40 °C to +125 °C junction), including PAT, SYL, and SBL statistical testing for automotive reliability. |
| Low-noise output | 50 µV RMS noise (10 Hz–100 kHz); avoids interference in precision ADC references or RF front-end biasing. |
| Internal protection | Integrated current limit and thermal shutdown prevent damage during short-circuit or overload events without external circuitry. |
| Wide input range | Operates from 6 V to 16 V input-covers cold-crank (6.5 V) and load-dump (up to 16 V) conditions in 12 V vehicle systems. |
| High PSRR at low frequency | 76 dB at 120 Hz matches alternator ripple frequency, directly mitigating noise coupling into infotainment or instrument cluster supplies. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Powers microcontroller core, CAN transceiver, and analog sensor interface in gasoline/diesel ECU under wide ambient and supply voltage variation. IC Role / Device Role / Timing Role: Primary 5 V local regulator delivering clean, stable voltage with fast transient response to dynamic CPU load changes. Use Value: Maintains 5.0 V ±1% regulation during cranking (VIN = 6.5 V) and load dump (VIN = 16 V), ensuring uninterrupted MCU operation. |
Use Scenario: Supplies door module microcontrollers, LIN transceivers, and LED drivers in centralized body electronics architecture. IC Role / Device Role / Timing Role: Always-on LDO with enable control, allowing selective power-down of submodules to meet <100 µA sleep current targets. Use Value: 50 µA OFF-mode quiescent current meets OEM requirements for low-static-current body networks. |
| Advanced Driver Assistance Systems (ADAS) | Instrument Cluster Display |
Use Scenario: Provides regulated 5 V to radar sensor signal chain (ADC, clock buffer, FPGA I/O) in front bumper module. IC Role / Device Role / Timing Role: Low-noise, high-PSRR LDO isolating sensitive analog front-end from noisy 12 V chassis supply. Use Value: 50 µV output noise and 76 dB PSRR prevent spurious tones in radar IF signals and preserve SNR in 16-bit ADC conversions. |
Use Scenario: Powers TFT-LCD timing controller, backlight driver IC, and touch controller in digital dashboard. IC Role / Device Role / Timing Role: High-current (500 mA) LDO supporting burst-mode display refresh and backlight dimming transients. Use Value: 0.4 V dropout ensures full 5 V output even during battery sag to 5.4 V-preventing display flicker or reset during acceleration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV73350PDBVR | 500 mA, 5 V, ±2% accuracy, 170 mV dropout at 500 mA, SOT-23-5 package, RthJA = 210 °C/W. | Lacks AEC-Q100 qualification; rated for industrial (−40 °C to +125 °C) but not automotive stress testing. | Select only for non-safety-critical, cost-sensitive consumer or industrial designs where qualification is not mandated. |
| TPS7B6950QPWPRQ1 | 500 mA, 5 V, ±2% accuracy, 300 mV dropout at 500 mA, WSON-6 package, RthJA = 120 °C/W, integrated reverse polarity protection. | AEC-Q100 Grade 1 qualified; higher dropout limits minimum input to 5.3 V-less tolerant of cold-crank conditions than LF50ABP. | Prefer when reverse-battery protection is required and cold-crank margin is sufficient; otherwise LF50ABP offers superior dropout and thermal performance. |
Compared with TLV73350PDBVR and TPS7B6950QPWPRQ1, LF50ABP delivers tighter output accuracy (±1% vs. ±2%), lower dropout (0.4 V vs. ≥0.17 V), and superior thermal resistance (RthJA = 100 °C/W vs. ≥120 °C/W), making it optimal for space-constrained, high-reliability automotive modules.
Availability
LF50ABP is available at Aetrix Electronics and suitable for engine control units, body control modules, ADAS sensor nodes, and instrument cluster displays requiring stable component supply across automotive production lifecycles.
Supply support for LF50ABP 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 microcontrollers, power management ICs, and automotive-grade analog devices.
The LFXX series was developed specifically for automotive power management, targeting high-reliability, low-quiescent-current LDO regulation in harsh environments with stringent thermal and qualification requirements.
FAQ
What is the maximum allowable input voltage for LF50ABP?
The absolute maximum DC input voltage is 40 V, but the device enters shutdown mode for inputs above 18 V. For normal regulation, the recommended operating input range is 6 V to 16 V-covering cold-crank (≥6.5 V) and load-dump (≤16 V) conditions per ISO 7637-2. Exceeding 16 V continuously risks thermal overstress without additional input clamping.
Can LF50ABP be used without an output capacitor?
No. A minimum 2.2 µF ceramic capacitor with ESR between 0.1 Ω and 10 Ω is mandatory for stability, as confirmed in the datasheet's test circuits and stability analysis. Omitting it causes oscillation and output voltage collapse under load. The capacitor must be placed within 5 mm of the OUT and GND pins with low-inductance layout.
Is the thermal pad on LF50ABP electrically isolated?
No. The exposed thermal pad (Pin 5, TAB) is internally connected to GND and must be soldered to a GND plane. This connection is essential for both thermal performance (RthJC = 8 °C/W) and EMI suppression. Floating or insulating the pad degrades junction temperature by >30 °C and increases radiated emissions.
Does LF50ABP require a bypass capacitor on the enable (EN) pin?
No dedicated bypass capacitor is specified for the EN pin. However, routing the EN trace away from noisy signals (e.g., switching node, motor drivers) and using a short, direct path to MCU GPIO minimizes false triggering. If system-level noise is severe, a 100 pF capacitor to GND may be added-but this is not a datasheet requirement and must be validated per application.
LF50ABP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-220-3 Full Pack
- 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-220FP
LF50ABP FAQ
1.How can I place an order for LF50ABP through Aetrix?
Please submit a Request for Quotation (RFQ) for LF50ABP 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 LF50ABP reliable?
The price and inventory of LF50ABP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF50ABP is usually 5 days.
3.What payment methods are accepted for LF50ABP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF50ABP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LF50ABP?
LF50ABP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LF50ABP 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 LF50ABP?
For technical support, including LF50ABP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF50ABP requirements.
6.How does Aetrix verify that LF50ABP is sourced from the original manufacturer or authorized distributors?
All LF50ABP 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 LF50ABP meets industry standards.
7.What is the process for return or replacement of LF50ABP?
All LF50ABP units undergo pre-shipment inspection (PSI). If there is an issue with LF50ABP, 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 LF50ABP part is unused and in its original packaging.
Return procedure for LF50ABP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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