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Texas Instruments LP38500TJ-ADJ/NOPB
- Part No.:
- LP38500TJ-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-5 Thin
- Datasheet:
-
LP38500TJ-ADJ/NOPB.pdf
- Description:
- IC REG LIN POS ADJ 1.5A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:9,484
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Product details
Overview
LP38500TJ-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, 220 mV dropout at 1.5 A, and stable operation with ceramic/tantalum/aluminum capacitors - used in FPGA core power supplies and precision ASIC rails.
For engineers reviewing the LP38500TJ-ADJ/NOPB datasheet, LP38500TJ-ADJ/NOPB pinout, LP38500TJ-ADJ/NOPB application, or LP38500TJ-ADJ/NOPB equivalent, key selection criteria include dropout voltage at full load, adjust-pin bias current (750 nA max), thermal shutdown threshold (170°C), FlexCap stability across capacitor ESR ranges, and GND pin current (2 mA typical at 1.5 A).
Technical Context
The LP38500TJ-ADJ/NOPB implements internal compensation enabling unconditional stability with any output capacitor type - including low-ESR ceramics - without external compensation components. Its feed-forward architecture enhances load transient response, achieving ≤40 mV deviation during 0.1 A → 1.5 A step changes at 0.5 A/µs slew rate.
It uses a PMOS pass element with inherent reverse-current diode path (rated for 200 mA continuous), supports disable mode only in LP38502 variants (not applicable here), and features overtemperature (170°C trip, 10°C hysteresis) and overcurrent protection. Junction temperature range is −40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1.5 A DC maximum - ensures sufficient headroom for FPGA core or DSP I/O rail peak loads without derating. |
| Dropout Voltage | 220 mV at 1.5 A (TJ = 25°C) - enables high-efficiency regulation from 3.3-V or 5-V rails down to sub-1-V logic supplies. |
| VADJ Accuracy | ±1.5% at 25°C (A grade) - guarantees tight output voltage tolerance when configured with precision resistors for sensitive analog or RF circuitry. |
| Quiescent Current | 2 mA typical at 1.5 A load - minimizes power loss in always-on subsystems while maintaining fast transient response. |
| PSRR | 58 dB at 120 Hz - suppresses ripple from upstream switching regulators feeding the LDO input, critical for noise-sensitive ADC/DAC supplies. |
| Thermal Shutdown | 170°C junction trip with 10°C hysteresis - provides robust thermal protection during sustained overload or poor PCB heatsinking. |
| Input Voltage Range | 2.7 V to 5.5 V - compatible with single-cell Li-ion, USB, and standard logic rails without intermediate conversion. |
Pinout & Package
LP38500TJ-ADJ/NOPB uses the DDPAK/TO-263 (KTT) 5-pin thermally enhanced package (10.16 mm × 8.42 mm), with exposed DAP electrically connected to die backside and requiring PCB ground connection for thermal conduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Input supply | Primary power input; shares current with second IN pin on PCB; must be decoupled with ≥10 µF capacitor within 1 cm. |
| OUT | Regulated output | Main output node; shares current with second OUT pin; requires ≥10 µF output capacitance for stability and transient response. |
| GND | Ground reference | System ground return; carries 2 mA typical current at full load; connects to PCB ground plane and DAP thermal pad. |
| ADJ | Feedback reference | Sets output voltage via resistor divider; bias current ≤750 nA enables use of high-value resistors minimizing divider power loss. |
| N/C | No internal connection | Unbonded pin; may be left floating or used for trace routing; no electrical function or thermal role. |
Key Features
| Feature | Design Value |
|---|---|
| FlexCap Compensation | Stable with ceramic, tantalum, or aluminum capacitors - eliminates ESR dependency and simplifies BOM by removing capacitor type restrictions. |
| Ultra-Low Dropout | 220 mV at 1.5 A - enables efficient 1.2-V output from 1.5-V input, supporting next-gen low-voltage logic domains. |
| Fast Load Transient Response | ≤40 mV output deviation during 0.1 A → 1.5 A step - maintains voltage integrity for burst-mode processors and high-speed SerDes I/O. |
| Precision Adjust Pin | VADJ = 0.605 V ±1.5% (A grade) - allows accurate programmable outputs from 0.6 V to 5 V using standard 1% resistors. |
| Robust Protection | Integrated overtemperature (170°C) and overcurrent limiting - prevents damage during short-circuit or thermal overload without external circuitry. |
Applications
| FPGA Core Power Supply | DSP I/O Rail Regulation |
|---|---|
|
Use Scenario: Powers 1.0-V or 1.2-V FPGA core logic under dynamic load conditions with rapid current transients. IC Role / Device Role / Timing Role: Primary low-noise, low-dropout regulator supplying configurable logic fabric; replaces multi-stage buck-LDO solutions. Use Value: 220 mV dropout enables direct regulation from 1.5-V intermediate rail; 58 dB PSRR suppresses switching noise from upstream DC/DC converter. |
Use Scenario: Delivers clean, stable 3.3-V or 2.5-V I/O supply to TI C6000 or Analog Devices SHARC DSPs with burst-mode memory access. IC Role / Device Role / Timing Role: Secondary LDO for interface voltage domain; decouples I/O switching noise from analog subsystems. Use Value: FlexCap stability allows use of small 10-µF X7R ceramics near BGA packages; 40 mV transient deviation meets JEDEC DDR timing margins. |
| ASIC Precision Analog Bias | SMPS Post-Regulation |
|
Use Scenario: Generates ultra-stable 2.05-V reference for high-resolution SAR ADCs or precision op-amp biasing in medical imaging front-ends. IC Role / Device Role / Timing Role: Precision-adjustable voltage source with minimal drift; serves as calibration reference generator. Use Value: ±1.5% VADJ accuracy and 100 µVrms output noise ensure <1 LSB error in 16-bit ADC systems over temperature. |
Use Scenario: Tightens output voltage tolerance and reduces ripple of 3.3-V buck converter powering Ethernet PHY or USB transceivers. IC Role / Device Role / Timing Role: Ripple-filtering post-regulator; improves power supply rejection for high-speed serial links. Use Value: 58 dB PSRR at 120 Hz attenuates fundamental switching frequency; ceramic-compatible design avoids ESR tuning complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A4701RGWR | Lower quiescent current (1 µA), higher PSRR (70 dB @ 1 kHz), but 200 mA max output - not suitable for 1.5-A loads. | Targeted at ultra-low-power precision analog, not high-current digital rails. | Select only if load current ≤200 mA and sub-µA IQ is mandatory; not a functional replacement for LP38500TJ-ADJ/NOPB's 1.5-A capability. |
| LT1963AES8#PBF | 1.5-A rating, 340 mV dropout at 1.5 A, stable with ≥10 µF ceramic - higher dropout and no FlexCap ESR independence. | Requires careful ESR selection; less tolerant of capacitor aging/voltage derating than LP38500TJ-ADJ/NOPB. | Acceptable where board space limits thermal solution and moderate dropout is acceptable; verify capacitor ESR compliance per application notes. |
Compared with TPS7A4701RGWR and LT1963AES8#PBF, LP38500TJ-ADJ/NOPB uniquely combines 1.5-A output, 220-mV dropout, and unconditional capacitor stability - making it optimal for compact, high-density FPGA/ASIC power designs where thermal margin and layout flexibility are constrained.
Availability
LP38500TJ-ADJ/NOPB is available at Aetrix Electronics and suitable for FPGA core power supplies, DSP I/O regulation, precision analog bias generation, SMPS post-regulation, and ASIC voltage domain management requiring stable component supply across production lifecycles.
Supply support for LP38500TJ-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 designing analog ICs, embedded processors, and system-on-chip solutions for industrial, automotive, and communications markets.
The LP38500 series belongs to TI's FlexCap LDO family, engineered specifically for high-current, low-noise, capacitor-flexible power delivery in space-constrained digital systems like FPGAs and multi-core processors.
FAQ
What is the maximum output current specification for LP38500TJ-ADJ/NOPB?
The LP38500TJ-ADJ/NOPB is specified for 1.5 A 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 package limits. The device includes overcurrent protection that limits peak output to 3.6 A.
Does LP38500TJ-ADJ/NOPB require a specific ESR range for output capacitors?
No - LP38500TJ-ADJ/NOPB uses TI's FlexCap internal compensation, which ensures stability with ceramic, tantalum, or aluminum electrolytic capacitors regardless of ESR value. Unlike conventional LDOs, it imposes no minimum or maximum ESR requirement, allowing designers to select capacitors based solely on capacitance, size, cost, and reliability - not loop compensation constraints.
What is the dropout voltage of LP38500TJ-ADJ/NOPB at full load?
The dropout voltage of LP38500TJ-ADJ/NOPB is 220 mV at 1.5 A load and 25°C junction temperature. At higher temperatures or lower input voltages, dropout increases slightly due to RDS(on) variation; the datasheet specifies 375 mV maximum at 1.5 A across the full temperature range. This enables efficient regulation of 1.2-V outputs from 1.5-V sources.
Can LP38500TJ-ADJ/NOPB be used with ceramic output capacitors?
Yes - LP38500TJ-ADJ/NOPB is explicitly designed for stable operation with ceramic output capacitors, including X5R and X7R dielectrics ≥10 µF. Its FlexCap architecture eliminates ESR-based compensation requirements, making it compatible with ultra-low-ESR ceramics (as low as a few mΩ) commonly used for high-frequency transient response in FPGA and processor applications.
What is the adjust pin (ADJ) voltage accuracy for LP38500TJ-ADJ/NOPB?
The adjust pin voltage (VADJ) of LP38500TJ-ADJ/NOPB is guaranteed at 0.605 V ±1.5% over temperature (−40°C to +125°C) for the A-grade version, which applies to LP38500TJ-ADJ/NOPB. This tight tolerance directly determines output voltage accuracy when using external resistors, enabling precise programmable outputs from 0.6 V to 5 V with standard 1% feedback resistors.
LP38500TJ-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-263-5 Thin
- 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-263-5 Thin
LP38500TJ-ADJ/NOPB FAQ
1.How can I place an order for LP38500TJ-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP38500TJ-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 LP38500TJ-ADJ/NOPB reliable?
The price and inventory of LP38500TJ-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 LP38500TJ-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LP38500TJ-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP38500TJ-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP38500TJ-ADJ/NOPB?
LP38500TJ-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP38500TJ-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 LP38500TJ-ADJ/NOPB?
For technical support, including LP38500TJ-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP38500TJ-ADJ/NOPB requirements.
6.How does Aetrix verify that LP38500TJ-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LP38500TJ-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 LP38500TJ-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LP38500TJ-ADJ/NOPB?
All LP38500TJ-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP38500TJ-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 LP38500TJ-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LP38500TJ-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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