LP38503TSX-ADJ/NOPB Texas Instruments Integrated Circuit (Other) In Stock
LP38503TSX-ADJ/NOPB is a 3 A adjustable ultra-low-dropout LDO voltage regulator by Texas Instruments, operating from 2.7 V to 5.5 V input with a typical dropout of only 420 mV at full load. Key specs: 3 A output current, 0.665 V maximum dropout voltage, -40°C to 125°C operating range. Pb-free 5-pin DDPAK/TO-263 package suits high-current board-mount power applications.
- Manufacturer
- Texas Instruments
- Package
- Other
- Pin Count
- 4
- Lifecycle
- ACTIVE
- Datasheet
- LP38503TSX-ADJ/NOPB Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $1.4900(MOQ 1)
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 3 A output current with ultra-low 420 mV typical dropout voltage minimizes power dissipation in high-current point-of-load regulators
- Wide input voltage range of 2.7 V to 5.5 V and -40°C to 125°C temperature range suit demanding industrial and automotive power designs
- Adjustable output allows the designer to set the regulated voltage with two external resistors, covering a broad range of load voltages from a single part
- 5-pin DDPAK/TO-263 surface-mount package with exposed pad provides low thermal resistance for reliable operation at full 3 A load current
Applications
LP38503TSX-ADJ/NOPB is used in point-of-load power stages for industrial control systems, embedded computing modules, and communications equipment where a stable, adjustable regulated rail must be derived from a 3.3 V or 5 V bus at currents up to 3 A. Its ultra-low dropout of 420 mV makes it especially effective in battery-powered portable instruments and handheld devices where maximizing run time from a nearly depleted cell is critical. The wide temperature range and robust TO-263 package also suit automotive infotainment and telematics power supply designs.
Specifications
| Pbfree Code | Yes |
| YTEOL | 15 |
| Adjustability | ADJUSTABLE |
| Dropout Voltage1-Max | 0.665V |
| Dropout Voltage1-Nom | 0.42V |
| Input Voltage-Max | 5.5V |
| Input Voltage-Min | 2.7V |
| JESD-30 Code | R-PSSO-G5 |
| JESD-609 Code | e3 |
| Line Regulation-Max (%/V) | 0.05 |
| Number of Functions | 1 |
| Number of Outputs | 1 |
| Operating Temperature TJ-Max | 125°C |
| Operating Temperature TJ-Min | -40 °C |
| Output Current1-Max | 3A |
| Output Voltage1-Max | 5V |
| Output Voltage1-Min | 0.6V |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SMSIP5H,.6,67TB |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Packing Method | TR |
| Peak Reflow Temperature (Cel) | 245 |
| Qualification Status | Not Qualified |
| Regulator Type | ADJUSTABLE POSITIVE SINGLE OUTPUT LDO REGULATOR |
| Surface Mount | YES |
| Technology | CMOS |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.7mm |
| Terminal Position | SINGLE |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Voltage Tolerance-Max | 2% |
| Package | Other |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 3 |
| 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
For a 3.3 V to 2.5 V conversion at 3 A, does the LP38503TSX-ADJ/NOPB provide enough headroom to regulate cleanly?
Yes. With a 3.3 V input and a 2.5 V output, the differential is 800 mV, which exceeds the LP38503TSX-ADJ/NOPB maximum dropout voltage of 665 mV at 3 A. The typical dropout is only 420 mV, so regulation is maintained with comfortable margin. This makes it a reliable choice for powering FPGAs, DSPs, or memory rails from a single 3.3 V system bus.
What is the line regulation performance of the LP38503TSX-ADJ/NOPB, and why does it matter in noisy supply environments?
The LP38503TSX-ADJ/NOPB achieves a maximum line regulation of 0.05 %/V, meaning a 1 V change on the input shifts the output by no more than 0.05% of the set output voltage. In a 5 V bus environment with ±5% ripple, this translates to less than 1.5 mV output variation, ensuring that sensitive analog or RF circuits powered from the regulator see a clean, stable supply rail.
How does the LP38503TSX-ADJ/NOPB handle thermal dissipation at high load currents in a compact PCB design?
The 5-pin DDPAK/TO-263 package includes a large exposed thermal pad that transfers heat directly to the PCB copper plane, giving a low junction-to-board thermal resistance. At 3 A with a 1 V dropout, the device dissipates 3 W; using a 2-oz copper pour of approximately 25 cm² keeps junction temperature below 125°C at an ambient of 70°C, enabling reliable full-load operation without an external heatsink.
When is the LP38503TSX-ADJ/NOPB a more cost-effective choice than a switching regulator for a 3 A regulated supply?
The LP38503TSX-ADJ/NOPB is preferred over a switching regulator when the input-to-output differential is below 1 V, because the power loss at 3 A is under 3 W and no inductor, diode, or complex EMI filtering is required. For example, converting 3.3 V to 2.5 V at 3 A results in only 2.4 W dissipation, giving efficiency above 75% while eliminating the switching noise that can interfere with 12-bit ADCs or RF front ends on the same board.
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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.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $4.6290 | $4.63 |
| 250+ | $2.3300 | $582.50 |
| 500+ | $1.6700 | $835.00 |
| 1000+ | $1.5800 | $1580.00 |
| 10000+ | $1.4900 | $14900.00 |
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