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Texas Instruments LP38502TJ-ADJ/NOPB
- Part No.:
- LP38502TJ-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-5 Thin
- Datasheet:
-
LP38502TJ-ADJ/NOPB.pdf
- Description:
- IC REG LIN POS ADJ 1.5A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:2,194
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Product details
Overview
LP38502TJ-ADJ/NOPB from Texas Instruments is an adjustable 1.5-A ultra-low-dropout linear regulator with PMOS pass transistor, operating from 2.7 V to 5.5 V input and delivering 0.6 V to 5 V output. It features FlexCap compensation for stability with ceramic/tantalum/aluminum capacitors, 25-nA shutdown current, and integrated enable control-used in FPGA core power supplies and precision ASIC rails.
For engineers reviewing the LP38502TJ-ADJ/NOPB datasheet, LP38502TJ-ADJ/NOPB pinout, LP38502TJ-ADJ/NOPB application, or LP38502TJ-ADJ/NOPB equivalent, key selection criteria include dropout voltage at 1.5 A (275 mV typ), ±1.5% VADJ accuracy (A grade), thermal shutdown at 170°C, and EN pin logic thresholds (VIH = 1.4 V, VIL = 0.65 V).
Technical Context
The LP38502TJ-ADJ/NOPB uses internal feed-forward architecture to accelerate load transient response-achieving ≤40 mV deviation during 0.1 A → 1.5 A step at 0.5 A/µs slew rate. Its unique compensation eliminates ESR dependency, enabling stable operation with any capacitor type including low-ESR ceramics.
It integrates overcurrent and thermal protection with 10°C hysteresis, operates across −40°C to +125°C junction temperature, and supports disable mode via a dedicated EN pin with <1 nA leakage. The device employs a PMOS pass element with inherent reverse-current diode rated for 200 mA continuous forward conduction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1.5 A DC maximum-supports high-current digital loads like FPGA I/O banks without derating at full ambient temperature. |
| Dropout Voltage | 275 mV typical at 1.5 A-enables efficient regulation from 3.3-V rail down to 3.025-V output, minimizing power loss. |
| VADJ Accuracy | ±1.5% at 25°C (A grade)-ensures tight output tolerance when setting 1.0 V, 1.2 V, or 1.8 V core voltages with external resistors. |
| PSRR | 56 dB at 1 kHz-suppresses switching noise from upstream SMPS, critical for noise-sensitive analog or RF subsystems. |
| Quiescent Current | 25 nA in shutdown-enables ultra-low-power retention states in battery-backed systems or always-on monitoring circuits. |
| Thermal Shutdown | 170°C with 10°C hysteresis-prevents permanent damage during sustained overload or poor heatsinking, enabling safe fault recovery. |
| Enable Thresholds | VIH = 1.4 V, VIL = 0.65 V-compatible with 1.8-V and 3.3-V logic families without level-shifting circuitry. |
Pinout & Package
LP38502TJ-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 GND for PCB heatsinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Input supply | Primary power input; shares current with second IN pin on PCB-must be shorted externally for full 1.5-A capability. |
| OUT | Regulated output | Main power delivery node; shares current with second OUT pin-requires parallel routing to minimize impedance. |
| GND | Ground reference | System ground return; connects to DAP for thermal conduction-must be tied to large copper pour for thermal management. |
| ADJ | Feedback reference | Sets output voltage via resistor divider; bias current ≤750 nA enables use of high-value resistors to reduce quiescent error. |
| EN | Enable control | Active-high logic input; drives output ON/OFF with 25 µs turnon/turnoff delay-supports sequencing and power gating. |
Key Features
| Feature | Design Value |
|---|---|
| FlexCap Compensation | Stable with any capacitor chemistry (ceramic, tantalum, aluminum) and zero ESR constraint-eliminates capacitor selection risk and simplifies BOM consolidation. |
| Fast Load Transient Response | ≤40 mV output deviation during 0.1 A → 1.5 A load step-maintains voltage integrity for burst-mode processors and high-speed SerDes interfaces. |
| Ultra-Low Shutdown Current | 25 nA max-reduces standby power in portable devices to sub-µW levels, extending battery life in sleep modes. |
| Integrated Enable Logic | Dedicated EN pin with rail-to-rail compatible thresholds-enables direct connection to microcontroller GPIOs without external level shifters. |
| Thermal Protection with Hysteresis | 170°C trip point + 10°C hysteresis-prevents thermal runaway while allowing automatic recovery after cooling, avoiding system lockup. |
Applications
| FPGA Core Power Supply | DSP I/O Rail Regulation |
|---|---|
Use Scenario: Powers 1.2-V or 1.8-V FPGA core logic requiring clean, low-noise supply with fast transient response during configuration and high-speed data processing. IC Role / Device Role / Timing Role: Primary LDO regulator providing tightly regulated core voltage; handles dynamic current steps up to 1.5 A with minimal droop. Use Value: Maintains FPGA timing margins by limiting output deviation to ≤40 mV during 0.5 A/µs load transients, preventing setup/hold violations. |
Use Scenario: Supplies 3.3-V I/O banks of multi-core DSPs in telecom baseband modules where EMI from adjacent RF sections must be suppressed. IC Role / Device Role / Timing Role: Low-noise post-regulator filtering switching converter ripple; PSRR ≥56 dB at 1 kHz rejects SMPS switching artifacts. Use Value: Enables reliable high-speed serial interface operation (e.g., JESD204B) by reducing output noise to 100 µVrms (100 Hz–100 kHz). |
| ASIC Precision Analog Bias | Industrial PLC Digital Input Conditioning |
Use Scenario: Generates 2.5-V or 4.096-V reference voltage for high-resolution ADCs in test equipment, demanding ±0.5% total output accuracy over temperature. IC Role / Device Role / Timing Role: Adjustable LDO configured as precision voltage source; leverages ±1.5% VADJ accuracy and low line/load regulation (0.04%/V, 0.18%/A). Use Value: Achieves <±0.3% total output error across −40°C to +85°C when paired with 0.1% resistor divider, eliminating need for trimming. |
Use Scenario: Provides isolated 5-V logic supply for optocoupler-based digital input stages in programmable logic controllers operating in noisy factory environments. IC Role / Device Role / Timing Role: Robust local regulator immune to input rail disturbances; withstands reverse current up to 200 mA if field wiring induces backfeed. Use Value: Prevents false triggering during cable hot-plug events by tolerating output-voltage excursions above input without latch-up or damage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPL7407LPGEDR | 7-channel 200-mA sink driver with integrated LDO; no ADJ pin-fixed 3.3-V output only. | Limited to low-current digital I/O buffering; cannot replace LP38502TJ-ADJ/NOPB in high-current or adjustable-voltage roles. | Select only for multi-channel LED/driver applications where per-channel regulation is unnecessary. |
| TPS7A4701RGWR | 1-A ultra-low-noise LDO (4 µVrms) with fixed/adjustable options; higher PSRR (70 dB @ 1 kHz) but lower current rating. | Better suited for RF/analog signal chains than digital power rails; insufficient for 1.5-A FPGA core loads. | Choose when sub-10 µVrms noise and >65 dB PSRR outweigh current capacity requirements. |
Compared with TPL7407LPGEDR and TPS7A4701RGWR, LP38502TJ-ADJ/NOPB uniquely balances 1.5-A output, adjustable voltage, FlexCap stability, and 25-nA shutdown-making it optimal for cost-sensitive, high-current embedded digital power where capacitor flexibility and thermal robustness are critical.
Availability
LP38502TJ-ADJ/NOPB is available at Aetrix Electronics and suitable for FPGA core power supplies, DSP I/O regulation, precision ASIC biasing, and industrial PLC digital input conditioning requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LP38502TJ-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 connectivity solutions for industrial, automotive, and consumer applications.
The LP38502TJ-ADJ/NOPB belongs to TI's FlexCap LDO family, engineered specifically for high-current, low-noise, and capacitor-flexible power delivery in space-constrained digital systems where rapid load transients and thermal reliability are paramount.
FAQ
What is the maximum output current capability of the LP38502TJ-ADJ/NOPB under continuous operation?
The LP38502TJ-ADJ/NOPB delivers 1.5 A DC output current continuously across its full operating temperature range (−40°C to +125°C junction), provided thermal design meets RθJA ≤ 41.8°C/W (DDPAK/TO-263 package) and sufficient PCB copper area is allocated to the DAP for heat dissipation.
Does the LP38502TJ-ADJ/NOPB require specific output capacitor types or ESR ranges?
No-the LP38502TJ-ADJ/NOPB uses FlexCap internal compensation and is stable with any capacitor chemistry (ceramic, tantalum, aluminum) and zero ESR constraints. A minimum 10-µF output capacitor is required, but no upper ESR limit applies, simplifying capacitor selection and enabling use of low-cost bulk electrolytics alongside high-frequency ceramics.
How does the enable pin (EN) function on the LP38502TJ-ADJ/NOPB, and what are its voltage thresholds?
The EN pin on LP38502TJ-ADJ/NOPB is an active-high logic input: output enables when EN ≥ 1.4 V (VIH), disables when EN ≤ 0.65 V (VIL). It draws <1 nA leakage and requires no pull-up if driven actively; if left unconnected, it must be tied to VIN to prevent floating. Turnon/turnoff delay is 25 µs at 1.5-A load.
What is the dropout voltage specification for LP38502TJ-ADJ/NOPB at full 1.5-A load?
At 1.5-A load and TJ = 25°C, the LP38502TJ-ADJ/NOPB has a typical dropout voltage of 275 mV and a maximum of 375 mV. This allows regulation from a 3.3-V input down to a 3.025-V output (typical), making it suitable for low-headroom applications such as post-regulation of switched-mode supplies.
Can the LP38502TJ-ADJ/NOPB safely handle reverse current flow from output to input?
Yes-the LP38502TJ-ADJ/NOPB contains a PMOS pass transistor with an inherent body diode that permits controlled reverse current. It tolerates up to 200 mA continuous and 1-A peak reverse conduction, enabling safe operation in systems with back-driven outputs (e.g., hot-swap or redundant supply configurations), provided output is not pulled below ground.
LP38502TJ-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):
- 4 mA
- PSRR:
- 58dB ~ 56dB (120Hz ~ 1kHz)
- Control Features:
- Enable
- 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
LP38502TJ-ADJ/NOPB FAQ
1.How can I place an order for LP38502TJ-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP38502TJ-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 LP38502TJ-ADJ/NOPB reliable?
The price and inventory of LP38502TJ-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 LP38502TJ-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LP38502TJ-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP38502TJ-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP38502TJ-ADJ/NOPB?
LP38502TJ-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP38502TJ-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 LP38502TJ-ADJ/NOPB?
For technical support, including LP38502TJ-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP38502TJ-ADJ/NOPB requirements.
6.How does Aetrix verify that LP38502TJ-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LP38502TJ-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 LP38502TJ-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LP38502TJ-ADJ/NOPB?
All LP38502TJ-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP38502TJ-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 LP38502TJ-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LP38502TJ-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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