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Texas Instruments LP38500TSX-ADJ/NOPB
- Part No.:
- LP38500TSX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LP38500TSX-ADJ/NOPB.pdf
- Description:
- IC REG LINEAR POS ADJ 1.5A DDPAK
- Quantity:
- Payment:
- Shipping:
Inventory:833
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Product details
Overview
LP38500TSX-ADJ/NOPB from Texas Instruments is an adjustable 1.5-A ultra-low-dropout linear regulator using a PMOS pass transistor, operating from 2.7 V to 5.5 V input and delivering 0.6 V to 5 V output with ±1.5% VADJ accuracy (A grade) at 25°C. It features FlexCap compensation for stability with ceramic, tantalum, or aluminum capacitors, 275 mV dropout at 1.5 A, and 2 mA ground-pin current under full load - used in precision FPGA core voltage regulation where fast transient response and low-noise biasing are critical.
For engineers reviewing the LP38500TSX-ADJ/NOPB datasheet, LP38500TSX-ADJ/NOPB pinout, LP38500TSX-ADJ/NOPB application, or LP38500TSX-ADJ/NOPB equivalent, key selection considerations include its DDPAK/TO-263-5 package thermal performance (RθJA = 41.8°C/W), disable-mode absence (distinguishing it from LP38502 variants), ceramic-capacitor compatibility without ESR constraints, and guaranteed 1.5-A output current with integrated overtemperature and overcurrent protection.
Technical Context
The LP38500TSX-ADJ/NOPB implements internal compensation that eliminates ESR dependency for output capacitor stability - enabling use of any capacitor type (ceramic, tantalum, aluminum) without minimum/maximum ESR limits. Its PMOS pass transistor architecture delivers ultra-low dropout (275 mV at 1.5 A) and low quiescent current variation across load.
It lacks an ENABLE pin and operates in fixed enable mode, distinguishing it functionally from the LP38502-ADJ. The device uses a single ADJ pin for feedback, with VADJ = 0.605 V (typ) and IADJ = 750 nA (max), supporting precise resistor-divider-based output programming while maintaining ±3.5% total output accuracy over line, load, and temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1.5 A DC - ensures sufficient headroom for FPGA core rails and ASIC logic supplies under peak switching loads. |
| Input Voltage Range | 2.7 V to 5.5 V - supports direct regulation from common intermediate rails including 3.3 V and 5 V SMPS outputs. |
| Adjust Pin Voltage | 0.605 V (typ), ±1.5% (A grade at 25°C) - enables accurate, temperature-stable output setting via external resistors. |
| Dropout Voltage | 275 mV at 1.5 A - allows operation with minimal VIN–VOUT margin, critical for low-voltage systems like 1.8-V or 1.2-V cores. |
| Ground Pin Current | 2 mA at 1.5-A load - low, stable bias current simplifies thermal modeling and reduces system-level power loss. |
| PSRR | 56 dB at 1 kHz - suppresses ripple from upstream switching regulators, preserving clean analog/digital supply integrity. |
| Thermal Shutdown | 170°C with 10°C hysteresis - provides robust fault recovery in high-power-density PCB layouts without external thermal monitoring. |
Pinout & Package
LP38500TSX-ADJ/NOPB is housed in a thermally enhanced DDPAK/TO-263-5 (KTT) package (10.16 mm × 8.42 mm), featuring an exposed DAP (die attach pad) electrically connected to GND and requiring PCB copper pour for heatsinking. The 5-pin configuration supports high-current routing with shared IN/OUT pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Input supply | Primary power input; shares current with secondary IN pin - must be shorted on PCB for proper current sharing and thermal distribution. |
| OUT | Regulated output | Main regulated output; shares current with secondary OUT pin - requires parallel trace routing to handle 1.5-A continuous load. |
| GND | Ground reference | System ground return; connects internally to DAP - must be tied to large copper area for thermal conduction and noise control. |
| ADJ | Feedback reference | Sets output voltage via resistor divider; draws only 750 nA max - enables high-impedance, low-power feedback networks. |
| N/C | No connect | Unbonded pin; may be left floating or used for trace routing - no electrical function or internal connection. |
Key Features
| Feature | Design Value |
|---|---|
| FlexCap compensation | Stable with ceramic, tantalum, or aluminum output capacitors - eliminates ESR tuning effort and enables cost-optimized bulk + bypass capacitor selection. |
| Ultra-low dropout | 275 mV at 1.5 A - maximizes efficiency in low VIN–VOUT margin applications such as post-regulation of 3.3-V SMPS outputs to 1.8-V logic rails. |
| Fast load transient response | ±40 mV deviation during 0.1 A → 1.5 A step (0.5 A/µs slew) - maintains voltage integrity during FPGA core state transitions and burst-mode processor activity. |
| Integrated protection | Overcurrent limiting + thermal shutdown (170°C, 10°C hysteresis) - prevents damage during short-circuit events or inadequate heatsinking without external circuitry. |
| Precision feedback | VADJ = 0.605 V ±1.5% (A grade) with 750 nA bias - enables <1% output tolerance across temperature when using 0.1% resistors in divider network. |
Applications
| ASIC Power Supplies | DSP Core Regulation |
|---|---|
Use Scenario: Powering ASIC logic blocks in printers, set-top boxes, and network routers where input rails vary between 3.3 V and 5 V. IC Role / Device Role / Timing Role: Primary low-noise, adjustable LDO delivering stable core voltage to digital logic with tight sequencing requirements. Use Value: FlexCap stability ensures reliable operation with low-ESR ceramic capacitors, reducing board space and eliminating ESR-related instability risks during hot-plug events. |
Use Scenario: Supplying 1.2-V or 1.5-V DSP cores in audio processing units and industrial controllers subject to dynamic load changes. IC Role / Device Role / Timing Role: High-bandwidth LDO providing rapid transient response to maintain voltage within ±2.2% during instruction fetch bursts. Use Value: 275-mV dropout enables efficient conversion from 3.3-V intermediate rail, minimizing power loss and thermal stress in compact enclosures. |
| FPGA I/O Bank Supply | SMPS Post-Regulator |
Use Scenario: Regulating I/O bank voltages (e.g., 2.5 V or 3.3 V) in Xilinx or Intel FPGAs where multiple banks require independent, low-noise supplies. IC Role / Device Role / Timing Role: Adjustable LDO generating precise, ripple-free I/O supply referenced to system ground with minimal layout sensitivity. Use Value: ±1.5% VADJ accuracy and 56-dB PSRR at 1 kHz ensure signal integrity across high-speed interfaces (LVDS, SSTL) without added filtering. |
Use Scenario: Cleaning up switching noise from 3.3-V or 5-V buck converters feeding sensitive analog subsystems or RF front-ends. IC Role / Device Role / Timing Role: Low-noise linear post-regulator suppressing high-frequency ripple and harmonics generated by upstream SMPS stages. Use Value: Ceramic-compatible design allows placement of small, high-frequency bypass caps directly at LDO output - achieving sub-100 µVrms output noise (100 Hz–100 kHz). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A4700RGWR | 20-V input range, 1-A output, 4-µVrms noise, WSON-20 package - higher PSRR (70 dB @ 1 kHz) but lower current rating. | Preferred for ultra-low-noise analog signal chains (e.g., ADC/DAC references); unsuitable for >1.5-A digital loads. | Select when noise performance dominates over current capability and input voltage exceeds 5.5 V. |
| LP38798SD-ADJ/NOPB | Same 1.5-A rating, 2.7–6.5-V input, 200-mV dropout, WSON-8 package - includes enable pin and tighter ±0.5% VADJ accuracy. | Supports power sequencing and remote ON/OFF control; better suited for portable/embedded systems requiring shutdown mode. | Choose when enable functionality, smaller footprint, or improved accuracy justifies trade-off in thermal resistance (RθJA = 52.5°C/W vs. 41.8°C/W). |
Compared with TPS7A4700RGWR and LP38798SD-ADJ/NOPB, LP38500TSX-ADJ/NOPB offers superior thermal dissipation in high-current, space-constrained industrial designs due to its DDPAK package, while maintaining proven FlexCap reliability across capacitor types - making it optimal for cost-sensitive, high-volume FPGA/ASIC power delivery where disable control is unnecessary.
Availability
LP38500TSX-ADJ/NOPB is available at Aetrix Electronics and suitable for FPGA core regulation, ASIC logic supply, and SMPS post-regulation requiring stable component supply, long-term production continuity, and RoHS-compliant packaging.
Supply support for LP38500TSX-ADJ/NOPB 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management ICs, with decades of LDO design expertise and broad automotive, industrial, and communications portfolio coverage.
The LP38500 series belongs to TI's FlexCap LDO family, engineered specifically for high-current, low-dropout applications where capacitor flexibility, thermal robustness, and transient performance outweigh enable-functionality requirements - targeting infrastructure and computing power delivery.
FAQ
What is the maximum output current supported by the LP38500TSX-ADJ/NOPB?
The LP38500TSX-ADJ/NOPB is specified to deliver up to 1.5 A of continuous DC output current under recommended operating conditions (TJ ≤ 125°C). This rating is ensured across the full input range (2.7 V to 5.5 V) and output voltage range (0.6 V to 5 V), with thermal derating required above ambient temperatures where power dissipation exceeds safe junction limits. The LP38500TSX-ADJ/NOPB includes overcurrent protection to limit peak output to approximately 3.6 A during transient overload.
Does the LP38500TSX-ADJ/NOPB include an enable (EN) pin?
No, the LP38500TSX-ADJ/NOPB does not feature an enable pin. It is a fixed-enable device - the output is active whenever valid input voltage is applied within the 2.7 V to 5.5 V range. In contrast, the LP38502-ADJ variant includes an EN pin for external control. The LP38500TSX-ADJ/NOPB pinout contains only IN, OUT, GND, ADJ, and N/C terminals, with no dedicated enable functionality integrated into the LP38500TSX-ADJ/NOPB silicon or package.
Which output capacitors are compatible with the LP38500TSX-ADJ/NOPB?
The LP38500TSX-ADJ/NOPB is FlexCap-stable and fully compatible with ceramic (X5R/X7R dielectric), tantalum, and aluminum electrolytic output capacitors - with no minimum or maximum ESR restrictions. A minimum of 10 µF is required, placed within 1 cm of the device. Ceramic capacitors are preferred for transient response due to ultra-low ESR/ESL; X5R/X7R types are mandatory - Z5U/Y5F ceramics are excluded due to severe capacitance loss with temperature and bias voltage.
What is the dropout voltage specification for the LP38500TSX-ADJ/NOPB at full load?
The LP38500TSX-ADJ/NOPB has a typical dropout voltage of 275 mV at 1.5 A load and 25°C junction temperature, defined as the minimum VIN–VOUT differential required to maintain output regulation within 2% of nominal. At higher temperatures or lower loads, dropout decreases - e.g., 220 mV (typ) at 1.5 A and 25°C per Electrical Characteristics table. This ultra-low dropout enables efficient operation from 3.3-V or 5-V rails down to sub-2-V outputs without violating regulation.
How is the output voltage set on the LP38500TSX-ADJ/NOPB?
The output voltage of the LP38500TSX-ADJ/NOPB is set externally using a two-resistor divider connected between OUT, ADJ, and GND. The formula is VOUT = VADJ(1 + R1/R2) + IADJ·R1, where VADJ = 0.605 V (typ), IADJ ≤ 750 nA, and R2 ≤ 10 kΩ for optimal loop stability. For example, to achieve 1.8 V: select R2 = 10 kΩ, then R1 ≈ 19.8 kΩ (standard 1% value). The LP38500TSX-ADJ/NOPB requires no additional compensation components due to its internal FlexCap architecture.
LP38500TSX-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5V
- Voltage Dropout (Max):
- 0.37 @ 1.5A
- Current - Output:
- 1.5A
- Current - Quiescent (Iq):
- 15 µA
- Current - Supply (Max):
- 3.5 mA
- PSRR:
- 58dB ~ 56dB (120Hz ~ 1kHz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-5)
LP38500TSX-ADJ/NOPB FAQ
1.How can I place an order for LP38500TSX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP38500TSX-ADJ/NOPB 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 LP38500TSX-ADJ/NOPB reliable?
The price and inventory of LP38500TSX-ADJ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP38500TSX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LP38500TSX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP38500TSX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP38500TSX-ADJ/NOPB?
LP38500TSX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP38500TSX-ADJ/NOPB 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 LP38500TSX-ADJ/NOPB?
For technical support, including LP38500TSX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP38500TSX-ADJ/NOPB requirements.
6.How does Aetrix verify that LP38500TSX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LP38500TSX-ADJ/NOPB 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 LP38500TSX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LP38500TSX-ADJ/NOPB?
All LP38500TSX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP38500TSX-ADJ/NOPB, 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 LP38500TSX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LP38500TSX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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