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Texas Instruments LP3873ES-2.5/NOPB
- Part No.:
- LP3873ES-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LP3873ES-2.5/NOPB.pdf
- Description:
- IC REG LIN 2.5V 3A DDPAK/TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:288
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Product details
Overview
LP3873ES-2.5/NOPB from Texas Instruments is a 3A ultra-low-dropout linear regulator with fixed 2.5V output, designed for microprocessor core and I/O power delivery. It delivers ±1.5% output voltage accuracy at room temperature, maintains 80mV dropout at 300mA and 800mV at 3A load, and operates from 2.5V to 7.0V input supply - enabling use in post-regulation and battery-powered systems requiring stable low-voltage rails.
For engineers reviewing the LP3873ES-2.5/NOPB datasheet, LP3873ES-2.5/NOPB pinout, LP3873ES-2.5/NOPB application, or LP3873ES-2.5/NOPB equivalent, key selection considerations include dropout performance under full 3A load, ground current behavior across temperature, error flag threshold hysteresis, and compatibility with low-ESR ceramic or tantalum output capacitors per TI's stability curve.
Technical Context
The LP3873ES-2.5/NOPB uses a CMOS-based PMOS pass element architecture that enables ultra-low quiescent current independent of load - 6mA typical at 3A, 1µA in shutdown. Its error flag comparator monitors output voltage with ±10% threshold and built-in hysteresis, asserting low when VOUT drops below nominal by ≥10%.
Unlike the LP3876 variant, the LP3873ES-2.5/NOPB lacks a SENSE pin and regulates voltage at the VOUT pin only - making it suitable for local regulation where trace resistance is negligible. It integrates overtemperature and overcurrent protection, with short-circuit current limited to 6A peak and thermal shutdown activating above +125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V ±1.5% (25°C), ±3.0% over full temperature/load range - ensures stable core rail for 2.5V logic and memory interfaces. |
| Max Output Current | 3A DC continuous - supports high-current FPGA I/O banks and DSP subsystems without external current boosting. |
| Dropout Voltage | 800mV at 3A load - enables operation from 3.3V input while maintaining 2.5V output, critical for multi-rail systems with tight voltage margins. |
| Ground Pin Current | 6mA typical at 3A load - low bias current minimizes system power loss and simplifies thermal design vs. bipolar LDOs. |
| PSRR | 57dB at 120Hz (VIN = VOUT + 0.5V) - suppresses ripple from upstream switching regulators, reducing need for additional filtering. |
| Output Noise | 150µVrms (BW = 10Hz–100kHz) - low noise preserves signal integrity in ADC reference and analog sensor supply paths. |
| Error Flag Threshold | −10% VOUT with 5% hysteresis - provides reliable undervoltage detection for system reset sequencing and fault logging. |
Pinout & Package
LP3873ES-2.5/NOPB is housed in a 5-pin DDPAK/TO-263 surface-mount package with exposed thermal pad (KTT0005B), optimized for high-power dissipation in compact PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SD | Shutdown control input | CMOS-compatible active-low enable; requires 10kΩ pull-up to VIN for default ON operation; reduces quiescent current to 1µA when asserted. |
| 2 - VIN | Main input supply connection | Accepts 2.5V–7.0V; must be decoupled with ≥1µF ceramic capacitor placed within 1 cm to minimize noise coupling and ensure stability. |
| 3 - GND | Power ground reference | Single-point Kelvin connection point for input/output capacitors; must tie directly to low-impedance ground plane to avoid ground bounce during load transients. |
| 4 - VOUT | Regulated output terminal | Delivers 2.5V at up to 3A; output capacitor (≥10µF, ESR < 1Ω) must connect directly between VOUT and GND with minimal trace length. |
| 5 - ERROR | Open-drain fault indicator | Sinks up to 1mA when VOUT falls ≥10% below nominal; requires external pull-up resistor (10kΩ–1MΩ); disabled during shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 800mV at full 3A load enables use with 3.3V input rails - avoids need for higher-input supplies or cascaded regulation stages. |
| CMOS process architecture | Ground current remains stable across load (6mA typ. at 3A), eliminating thermal runaway risk and simplifying heatsink sizing. |
| Integrated protection | Thermal shutdown and current limiting respond autonomously to overload or ambient rise - no external circuitry required for safe 3A operation. |
| Fast transient response | Stabilizes within microseconds after 1A load step (per Figure 12–21), minimizing output droop in burst-mode processor workloads. |
| Low-noise output | 150µVrms broadband noise supports sensitive analog circuits like PLLs and high-resolution ADCs without added LDO filtering. |
Applications
| Microprocessor Core Power | GTL/GTL+ Bus Termination |
|---|---|
Use Scenario: Supplying 2.5V core voltage to legacy Pentium-class CPUs and embedded microcontrollers with dynamic current draw up to 3A. IC Role / Device Role / Timing Role: Primary low-noise, fast-response linear regulator delivering stable VCC_CORE with minimal voltage deviation during instruction fetch bursts. Use Value: 80mV dropout at light load and 800mV at full load allows direct regulation from 3.3V supply, reducing BOM count and board area vs. buck-LDO combinations. |
Use Scenario: Providing precision 2.5V termination voltage for GTL/GTL+ signaling buses in server backplanes and telecom line cards. IC Role / Device Role / Timing Role: Low-impedance, low-noise voltage source maintaining bus signal integrity during high-speed data transitions (up to 200MHz). Use Value: ±1.5% output accuracy and 57dB PSRR suppress supply-induced jitter, ensuring clean edge timing and reduced bit error rates. |
| DSP Power Supply | SCSI Terminator |
Use Scenario: Powering 2.5V I/O sections of fixed-point and floating-point digital signal processors in audio and motor control systems. IC Role / Device Role / Timing Role: Local LDO supplying clean, regulated voltage to DSP I/O buffers and memory interfaces with minimal ground noise coupling. Use Value: 150µVrms output noise prevents quantization errors in analog front-end sampling and preserves SNR in real-time processing chains. |
Use Scenario: Delivering stable 2.5V termination for Ultra SCSI and Fast-20 SCSI parallel bus implementations in storage controllers. IC Role / Device Role / Timing Role: Precision voltage reference for passive termination networks, ensuring impedance matching across all bus segments. Use Value: Load regulation of 0.08% guarantees consistent termination voltage across 10mA–3A load range, preventing signal reflections and data corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-dropout linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS75725KTTT | 3A, 2.5V fixed output; 120mV dropout at 3A; integrated power-good flag; 1.1mm height QFN package. | Lower dropout enables 2.7V input operation; PG flag replaces ERROR functionality; smaller footprint but lower thermal mass. | Select when board space is constrained and input voltage margin is ≤200mV above 2.5V; verify thermal performance at 3A in QFN layout. |
| LT1963AES-2.5 | 1.5A, 2.5V fixed output; 340mV dropout at 1.5A; 20µVrms noise; SO-8 package with exposed pad. | Half the current rating but superior noise performance; no ERROR pin; requires external shutdown logic. | Select for low-noise analog subsystems drawing ≤1.5A where 150µV noise of LP3873ES-2.5/NOPB is insufficient; not suitable for 3A digital loads. |
Compared with TPS75725KTTT and LT1963AES-2.5, the LP3873ES-2.5/NOPB uniquely balances 3A capability, 800mV dropout at full load, and integrated ERROR flag in a thermally robust TO-263 package - making it optimal for industrial and telecom systems where reliability under sustained load and fault visibility are prioritized over minimal footprint or lowest possible noise.
Availability
LP3873ES-2.5/NOPB is available at Aetrix Electronics and suitable for microprocessor power supplies, GTL bus terminators, and DSP power delivery requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.
Supply support for LP3873ES-2.5/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 expertise in high-reliability linear regulation and thermal design.
The LP3873 series was developed specifically for high-current, low-noise, ultra-low-dropout applications in computing, communications, and industrial systems - emphasizing robustness under transient load, wide temperature operation (−40°C to +125°C), and simplified system integration.
FAQ
What is the minimum input voltage required for LP3873ES-2.5/NOPB to regulate 2.5V output?
The LP3873ES-2.5/NOPB requires VIN ≥ VOUT + VDROPOUT. With 800mV typical dropout at 3A, the minimum input is 3.3V under full load. At lighter loads (e.g., 300mA), dropout drops to 80mV, allowing operation from 2.58V. The absolute minimum VIN is 2.5V per operating ratings, but regulation is only ensured above VOUT + dropout.
Does LP3873ES-2.5/NOPB support remote sensing like the LP3876?
No. LP3873ES-2.5/NOPB does not include a SENSE pin and regulates voltage solely at the VOUT pin. Remote load regulation requires the LP3876 variant, which uses the SENSE pin to compensate for PCB trace resistance. For LP3873ES-2.5/NOPB, voltage drop across traces directly impacts load-side accuracy.
How should the ERROR pin of LP3873ES-2.5/NOPB be interfaced in a system?
The ERROR pin is an open-drain output that sinks current when VOUT drops ≥10% below 2.5V. It must be pulled high via a 10kΩ–1MΩ resistor to VIN or another logic supply. If unused, connect ERROR directly to GND. During shutdown, the ERROR pin is invalid and should not be monitored.
What output capacitor types and values are recommended for stable operation of LP3873ES-2.5/NOPB?
LP3873ES-2.5/NOPB requires ≥10µF output capacitance with ESR between 0.01Ω and 1Ω (per Figure 22). Solid tantalum capacitors are preferred for their stable ESR across temperature; X7R/X5R ceramics are acceptable if rated for full voltage/temperature range. Aluminum electrolytics are discouraged due to high, temperature-sensitive ESR.
Is LP3873ES-2.5/NOPB RoHS-compliant and lead-free?
Yes. The /NOPB suffix explicitly denotes lead-free and RoHS-compliant packaging. LP3873ES-2.5/NOPB meets JEDEC J-STD-020 moisture sensitivity level 3 and is qualified for reflow soldering per IPC/JEDEC J-STD-020 standards.
LP3873ES-2.5/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tube
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 7V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.2V @ 3A
- Current - Output:
- 3A
- Current - Quiescent (Iq):
- 9 mA
- Current - Supply (Max):
- 15 mA
- PSRR:
- 73dB ~ 57dB (120Hz)
- 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 (DDPAK-5)
LP3873ES-2.5/NOPB FAQ
1.How can I place an order for LP3873ES-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3873ES-2.5/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 LP3873ES-2.5/NOPB reliable?
The price and inventory of LP3873ES-2.5/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3873ES-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LP3873ES-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3873ES-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3873ES-2.5/NOPB?
LP3873ES-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3873ES-2.5/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 LP3873ES-2.5/NOPB?
For technical support, including LP3873ES-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3873ES-2.5/NOPB requirements.
6.How does Aetrix verify that LP3873ES-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3873ES-2.5/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 LP3873ES-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LP3873ES-2.5/NOPB?
All LP3873ES-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3873ES-2.5/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 LP3873ES-2.5/NOPB part is unused and in its original packaging.
Return procedure for LP3873ES-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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