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STMicroelectronics LF18ABPT-TR
- Part No.:
- LF18ABPT-TR
- Manufacturer:
- STMicroelectronics
- Package:
- TO-252-5, DPAK (4 Leads + Tab), TO-252AD
- Datasheet:
-
LF18ABPT-TR.pdf
- Description:
- IC REG LINEAR 1.8V 500MA PPAK
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
LF18ABPT-TR from STMicroelectronics is a 1.8 V, ±1% tolerance automotive-grade low-dropout linear regulator in PPAK-5 package, delivering up to 500 mA output current with 0.7 V dropout at 200 mA, 50 µA quiescent current in OFF mode, and logic-controlled shutdown (TTL-compatible enable pin). It serves as a local power supply for infotainment microcontrollers in battery-powered vehicle subsystems.
For engineers reviewing the LF18ABPT-TR datasheet, LF18ABPT-TR pinout, LF18ABPT-TR application, or LF18ABPT-TR equivalent, key selection considerations include its AEC-Q100 qualification, 2.2 µF minimum output capacitance requirement, -40 °C to 125 °C operating junction temperature range, and integrated thermal/current protection for under-hood automotive use.
Technical Context
The LF18ABPT-TR implements a PNP pass transistor architecture enabling ultra-low dropout voltage and high PSRR (82 dB at 120 Hz). Its 5-pin PPAK configuration integrates an active-low TTL-compatible enable input (Pin 2) that places the regulator in <100 µA standby mode when asserted.
Internal protection includes foldback current limiting and thermal shutdown with automatic recovery. The device achieves stability with only 2.2 µF ceramic output capacitor (ESR 0.1–10 Ω), eliminating need for electrolytic or tantalum types in space-constrained automotive modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.8 V ±1% (AB grade) at 50 mA, stable across -40 °C to 125 °C junction temp |
| Dropout Voltage | 0.7 V at 200 mA load - enables operation with minimal headroom (e.g., 2.5 V input → 1.8 V output) |
| Quiescent Current | 50 µA in OFF mode - reduces standby power in always-on vehicle networks |
| Output Current | 500 mA continuous - sufficient for powering ARM Cortex-M7 microcontrollers and CAN transceivers |
| PSRR | 82 dB at 120 Hz - suppresses alternator ripple and switching noise from upstream DC/DC converters |
| Capacitor Requirement | 2.2 µF ceramic output capacitor - lowers BOM cost and PCB area vs. traditional 10–22 µF solutions |
| Enable Logic | TTL-compatible active-low EN pin (Pin 2) - interfaces directly with 3.3 V MCU GPIO without level-shifting |
Pinout & Package
LF18ABPT-TR uses the PPAK-5 (Power Package) surface-mount package with exposed thermal pad (electrically connected to GND), optimized for high-power density and thermal performance in automotive modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input voltage supply | Accepts 3.0–16 V DC; internal overvoltage clamp activates above 40 V |
| 2 (EN) | Enable control input | Active-low TTL-compatible; pulls regulator into <100 µA shutdown when ≤0.8 V |
| 3 (GND) | Ground reference | Common return for input, output, and enable circuits; tied to exposed thermal pad |
| 4 (OUT) | Regulated output | Delivers stable 1.8 V ±1% to load; requires ≥2.2 µF ceramic capacitor for stability |
| 5 (TAB) | Thermal pad / GND | Electrically connected to Pin 3; must be soldered to large copper pour for RthJA = 100 °C/W |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Grade 1 (-40 °C to 125 °C TJ) with PAT/SYL/SBL statistical testing - meets automotive reliability requirements |
| Logic-controlled shutdown | EN pin enables system-level power gating of sub-circuits (e.g., disabling display backlight during sleep) |
| Low-noise regulation | 50 µV RMS output noise (10 Hz–100 kHz) - avoids interference with sensitive ADCs and RF receivers |
| Integrated protection | Current foldback + thermal shutdown with auto-recovery - prevents latch-up during overload or ambient overheating |
| Minimal external components | No bypass capacitor needed on IN pin; only 0.1 µF input and 2.2 µF output required - simplifies layout |
Applications
| Infotainment Head Unit Core Power | Digital Cluster Microcontroller Supply |
|---|---|
|
Use Scenario: Local 1.8 V rail for ARM Cortex-M7 application processor core in automotive head unit. IC Role / Device Role / Timing Role: Primary LDO supplying core voltage domain with tight regulation and fast transient response. Use Value: 0.7 V dropout allows direct regulation from 2.5 V intermediate bus, reducing heat dissipation vs. higher-dropout alternatives. |
Use Scenario: Dedicated 1.8 V supply for graphics controller and memory interface in digital instrument cluster. IC Role / Device Role / Timing Role: Low-noise, AEC-Q100-compliant LDO ensuring clean power for high-speed parallel data buses. Use Value: 50 µV output noise prevents timing jitter on DDR interface clocks and pixel data lines. |
| Telematics Modem Baseband | ADAS Camera Interface Power |
|
Use Scenario: Standby power rail for LTE/GNSS modem baseband IC in always-connected telematics control unit. IC Role / Device Role / Timing Role: Enable-controlled LDO enabling deep-sleep mode with <100 µA quiescent current. Use Value: 50 µA OFF-mode current extends battery backup runtime during ignition-off periods beyond ISO 16750-2 requirements. |
Use Scenario: Powering MIPI CSI-2 image sensor interface circuitry in rear-view camera module. IC Role / Device Role / Timing Role: Low-ESR-stable LDO providing regulated 1.8 V to serializer IC and sensor I/O banks. Use Value: 2.2 µF ceramic capacitor compatibility eliminates ESR drift issues seen with tantalum caps in wide-temperature automotive environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCP1117ST18T3G | Fixed 1.8 V, ±2% tolerance, no enable pin, TO-220 package, 1.2 V dropout at 800 mA | Lacks logic shutdown; unsuitable for systems requiring dynamic power gating | Select only if board space permits TO-220 and enable functionality is unnecessary |
| TPS78018QDRVRQ1 | AEC-Q100 Grade 1, 1.8 V ±1%, 0.5 µA IQ in shutdown, 0.25 V dropout at 200 mA, WSON-6 package | Lower dropout and IQ, but requires ≥4.7 µF output cap and has different pinout | Prefer for ultra-low-power wake-on-LIN applications where 0.25 V dropout enables 2.05 V minimum input |
Compared with NCP1117ST18T3G, LF18ABPT-TR provides enable control and automotive qualification; compared with TPS78018QDRVRQ1, it trades lower IQ for smaller output capacitance and proven thermal robustness in PPAK under sustained 500 mA loads.
Availability
LF18ABPT-TR is available at Aetrix Electronics and suitable for automotive infotainment, digital instrument clusters, telematics control units, and ADAS camera modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LF18ABPT-TR 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 analog, MCU, power, and automotive ICs for industrial and transportation markets.
LFXX is ST's automotive-qualified LDO family targeting under-hood and cabin electronics, emphasizing AEC-Q100 compliance, low dropout, and minimal external component count for cost-sensitive Tier 1 modules.
FAQ
What is the maximum input voltage for LF18ABPT-TR?
The absolute maximum DC input voltage is 40 V, but the device enters shutdown mode when input exceeds 18 V. For normal regulation, the recommended operating input range is 3.0 V to 16 V - sufficient to cover automotive battery transients per ISO 7637-2 Pulse 5a while maintaining 1.8 V output.
Does LF18ABPT-TR require an input bypass capacitor?
Yes - a 0.1 µF ceramic capacitor placed within 5 mm of the IN pin is required per the datasheet test conditions. This stabilizes the internal reference and improves high-frequency PSRR; omitting it risks oscillation under fast load transients.
Can LF18ABPT-TR be used outside automotive applications?
Yes - its -40 °C to 125 °C junction temperature rating, 50 µA shutdown current, and 2.2 µF stability make it suitable for industrial IoT gateways and battery-powered medical monitors, though non-automotive users should verify qualification documentation for their specific reliability requirements.
How is thermal performance affected by PCB layout?
PPAK-5's exposed thermal pad must be soldered to ≥200 mm² of 2-oz copper connected to ≥4 thermal vias (0.3 mm diameter) to ground plane. Without this, RthJA degrades from 100 °C/W to >150 °C/W, risking thermal shutdown at >300 mA continuous load in still air.
LF18ABPT-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-252-5, DPAK (4 Leads + Tab), TO-252AD
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.7V @ 200mA (Typ)
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 1 mA
- Current - Supply (Max):
- 12 mA
- PSRR:
- 82dB ~ 60dB (120Hz ~ 10kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PPAK
LF18ABPT-TR FAQ
1.How can I place an order for LF18ABPT-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for LF18ABPT-TR 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 LF18ABPT-TR reliable?
The price and inventory of LF18ABPT-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF18ABPT-TR is usually 5 days.
3.What payment methods are accepted for LF18ABPT-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF18ABPT-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LF18ABPT-TR?
LF18ABPT-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LF18ABPT-TR 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 LF18ABPT-TR?
For technical support, including LF18ABPT-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF18ABPT-TR requirements.
6.How does Aetrix verify that LF18ABPT-TR is sourced from the original manufacturer or authorized distributors?
All LF18ABPT-TR 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 LF18ABPT-TR meets industry standards.
7.What is the process for return or replacement of LF18ABPT-TR?
All LF18ABPT-TR units undergo pre-shipment inspection (PSI). If there is an issue with LF18ABPT-TR, 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 LF18ABPT-TR part is unused and in its original packaging.
Return procedure for LF18ABPT-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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