PTLV73318PQDBVRQ1 Texas Instruments Integrated Circuit (SOT23 (5-Pin)) In Stock
Texas Instruments PTLV73318PQDBVRQ1 is an automotive-qualified, capacitor-free 300 mA LDO regulator with a fixed 1.8 V output and foldback current limiting. It accepts inputs from 2.3 V to 5.5 V with a maximum 0.34 V dropout voltage and achieves 0.001% line regulation. Available in a 5-pin SOT-23 package rated for AEC-Q100 automotive environments.
- Manufacturer
- Texas Instruments
- Package
- SOT23 (5-Pin)
- Pin Count
- 5
- Lifecycle
- OBSOLETE
- Datasheet
- PTLV73318PQDBVRQ1 Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- AEC-Q100 automotive qualification for reliable operation in -40°C to 125°C temperature environments
- Capacitor-free stable operation eliminates the external output capacitor, reducing BOM cost and board area
- Foldback current limiting protects load and device during short-circuit events by reducing output current as voltage drops
- Ultra-low 0.34 V maximum dropout at 300 mA from a 2.3 V to 5.5 V input rail
Applications
PTLV73318PQDBVRQ1 is designed for automotive body electronics, ADAS sensor modules, and infotainment systems requiring a stable 1.8 V rail from a 3.3 V or 5 V system supply. Its capacitor-free topology eliminates output capacitor selection constraints, simplifying PCB layout in compact ECU designs. The foldback current limit and AEC-Q100 compliance make it suitable for safety-relevant automotive loads where short-circuit protection without complete current foldback is essential.
Specifications
| YTEOL | 0 |
| Adjustability | FIXED |
| Dropout Voltage1-Max | 0.34V |
| Dropout Voltage1-Nom | 0.5V |
| Input Voltage Absolute-Max | 6V |
| Input Voltage-Max | 5.5V |
| Input Voltage-Min | 2.3V |
| JESD-30 Code | R-PDSO-G5 |
| Line Regulation-Max | 0.001% |
| Load Regulation-Max | 0.025% |
| Number of Functions | 1 |
| Number of Outputs | 1 |
| Operating Temperature TJ-Max | 150°C |
| Operating Temperature TJ-Min | -40 °C |
| Output Current1-Max | 0.3A |
| Output Voltage1-Max | 1.8252V |
| Output Voltage1-Min | 1.7748V |
| Output Voltage1-Nom | 1.8V |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | TSOP5,.11,37 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, LOW PROFILE, SHRINK PITCH |
| Packing Method | TR |
| Regulator Type | FIXED POSITIVE SINGLE OUTPUT LDO REGULATOR |
| Screening Level | AEC-Q100 |
| Surface Mount | YES |
| Technology | PMOS |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.95mm |
| Terminal Position | DUAL |
| Voltage Tolerance-Max | 1.4% |
| Package | SOT23 (5-Pin) |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What makes the PTLV73318PQDBVRQ1 suitable for automotive applications compared to standard commercial LDO regulators?
The PTLV73318PQDBVRQ1 carries AEC-Q100 Grade 1 qualification, confirming reliable operation across -40°C to 125°C junction temperature. It also meets automotive electromagnetic compatibility requirements, has a 6 V absolute maximum input rating to survive automotive transients, and provides foldback current limiting to protect downstream sensors in ADAS and body control modules from fault conditions.
How does the capacitor-free design of the PTLV73318PQDBVRQ1 simplify PCB layout in a multi-rail automotive ECU?
Traditional LDOs require a 1 µF to 10 µF output capacitor for stability, which occupies board space and adds ESR sensitivity. The PTLV73318PQDBVRQ1 is inherently stable without an output capacitor, reducing the component count by 1 and eliminating ESR-related oscillation concerns. In a 4-layer automotive ECU with tight spacing, this saves approximately 4 mm² per LDO instance and simplifies layout review.
What is the dropout voltage of the PTLV73318PQDBVRQ1, and how does it affect selection for 3.3 V to 1.8 V conversion?
The PTLV73318PQDBVRQ1 has a maximum dropout voltage of 0.34 V at 300 mA output. For 3.3 V input to 1.8 V output, the 1.5 V headroom greatly exceeds the 0.34 V dropout, ensuring full regulation even during input supply dips to 2.14 V. This margin is adequate for automotive battery systems where the 3.3 V supply may sag to 2.8 V under peak loads.
How does foldback current limiting in the PTLV73318PQDBVRQ1 protect a shorted 1.8 V sensor rail differently from simple current limiting?
Standard current limiting holds output current at 300 mA regardless of output voltage, which causes the LDO to dissipate up to 1.65 W during a short to ground on the 1.8 V rail. Foldback current limiting reduces output current as output voltage drops, cutting power dissipation during a short to approximately 0.3 W, preventing thermal shutdown and protecting the 5-pin SOT-23 package from damage in automotive short-circuit fault scenarios.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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