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Texas Instruments LP3876ESX-2.5/NOPB
- Part No.:
- LP3876ESX-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LP3876ESX-2.5/NOPB.pdf
- Description:
- IC REG LIN 2.5V 3A DDPAK/TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:304
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Product details
Overview
LP3876ESX-2.5/NOPB from Texas Instruments is a 3A ultra-low-dropout linear regulator with fixed 2.5V output, designed for high-current microprocessor and DSP power supplies. It delivers ±1.5% output voltage accuracy at room temperature, 800mV dropout at 3A load, and operates from 2.5V to 7.0V input. Its CMOS architecture enables 1µA shutdown current and supports remote sensing via dedicated SENSE pin.
For engineers reviewing the LP3876ESX-2.5/NOPB datasheet, LP3876ESX-2.5/NOPB pinout, LP3876ESX-2.5/NOPB application, or LP3876ESX-2.5/NOPB equivalent, key selection criteria include dropout performance under 3A load, remote-sense capability for point-of-load regulation, thermal protection behavior, and minimum output capacitor requirements for stability.
Technical Context
The LP3876ESX-2.5/NOPB uses a PMOS pass transistor architecture enabling ultra-low dropout operation independent of load current. Its error amplifier compares either VOUT (LP3873) or remote SENSE voltage (LP3876) against an internal reference, driving the pass element to maintain regulation.
It integrates overtemperature and overcurrent protection with thermal shutdown cycling, plus an open-drain ERROR flag that asserts low when output drops >10% below nominal. Shutdown control is CMOS-compatible with 1nA input leakage and 20µs turn-off delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V ±1.5% (25°C), ±3.0% (−40°C to +125°C) |
| Max Output Current | 3A DC continuous; peak current up to 4.5A for short durations |
| Dropout Voltage | 800mV typical at 3A load - determines minimum VIN = 3.3V for stable 2.5V output |
| Ground Pin Current | 6mA typical at 3A load - contributes directly to total power dissipation |
| PSRR | 57dB at 120Hz with VIN = VOUT + 0.5V - critical for rejecting switching noise from upstream converters |
| Output Noise | 100µVrms (300Hz–300kHz, VOUT = 2.5V) - suitable for noise-sensitive analog/DSP rails |
| Shutdown Current | 1µA typical - enables battery-backed systems to maintain ultra-low standby power |
Pinout & Package
LP3876ESX-2.5/NOPB is packaged in a 5-pin DDPAK/TO-263 surface-mount package with exposed thermal pad for enhanced heat dissipation. The package footprint matches industry-standard TO-263-5 layout and requires minimum 0.5in² copper area for θJA = 60°C/W derating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SD | Shutdown Input | CMOS-compatible active-low enable; must be pulled high via 10kΩ resistor if not driven |
| 2 - VIN | Input Supply | Accepts 2.5V–7.0V; internal parasitic diode allows reverse current up to 200mA DC if VOUT > VIN |
| 3 - GND | Power Ground | Reference for all internal circuitry; connects to thermal pad - must be tied to large copper pour |
| 4 - VOUT | Regulated Output | Delivers 2.5V at up to 3A; output capacitor must be placed ≤1 cm away with Kelvin connection |
| 5 - SENSE | Remote Sense Input | Enables precision regulation at load point; connect directly to load VDD if remote placement required |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 800mV at 3A ensures operation with minimal headroom - critical for multi-rail systems where VIN margin is constrained |
| Remote sense capability | Dedicated SENSE pin compensates for trace IR drop - maintains ±1.5% accuracy at point-of-load even with 100mΩ interconnect |
| Integrated protection | Thermal shutdown and current limiting prevent damage during overload or poor heatsinking - cycles output instead of latching off |
| Low-noise output | 100µVrms broadband noise enables clean supply for ADCs, PLLs, and RF front-ends without additional filtering |
| Fast transient response | Stable with ≥10µF output capacitance and proper ESR - recovers within microseconds from 1A load steps |
Applications
| Microprocessor Core Power | GTL/GTL+ Bus Termination |
|---|---|
Use Scenario: Powers 3.3V or 2.5V CPU core logic requiring tight voltage tolerance and fast load-step response during burst-mode execution. IC Role / Device Role / Timing Role: Primary LDO delivering regulated 2.5V rail; SENSE pin connected to CPU VDD pin for precise point-of-load regulation. Use Value: Maintains ±1.5% output accuracy across −40°C to +125°C junction range while supporting 3A peak currents with <800mV dropout. | Use Scenario: Supplies termination voltage for high-speed GTL/GTL+ signaling buses in server memory subsystems. IC Role / Device Role / Timing Role: Low-noise, low-impedance 2.5V source referenced to bus ground; provides stable bias for differential receivers. Use Value: 100µVrms output noise prevents timing jitter; 0.08% load regulation minimizes voltage droop during simultaneous line switching. |
| DSP Power Supply | SCSI Terminator |
Use Scenario: Powers TI C6000 or Analog Devices SHARC DSPs requiring clean, well-regulated 2.5V I/O or core voltage. IC Role / Device Role / Timing Role: Post-regulator after a higher-efficiency DC/DC converter; filters switching ripple and provides low-noise bias. Use Value: 57dB PSRR at 120Hz suppresses upstream converter ripple; shutdown mode draws only 1µA for system-level power gating. | Use Scenario: Provides precise 2.5V termination voltage for legacy SCSI-2/3 parallel bus interfaces in storage controllers. IC Role / Device Role / Timing Role: Fixed-output LDO with high DC accuracy and low temperature drift - replaces discrete Zener-based solutions. Use Value: ±1.5% initial accuracy and ±3.0% over full temperature range ensure compliant bus voltage margins per SCSI specification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS75725KTTT | 2.5V, 3A LDO with 120mV dropout at 3A; lower quiescent current (125µA); no SENSE pin | Lacks remote sensing - unsuitable for long-trace or high-accuracy point-of-load regulation | Select when lowest possible dropout and minimal IQ are prioritized over remote sensing capability |
| LT1963AES8-2.5#PBF | 2.5V, 1.5A LDO with 340mV dropout at 1.5A; 20µVrms noise; SO-8 package | Half the output current rating; smaller package limits thermal performance at full load | Select when board space is constrained and 1.5A is sufficient; not a direct replacement for 3A designs |
Compared with LP3876ESX-2.5/NOPB, TPS75725KTTT offers superior dropout but sacrifices remote sensing, while LT1963AES8-2.5#PBF delivers ultra-low noise in compact form but cannot sustain 3A continuously - making LP3876ESX-2.5/NOPB uniquely balanced for high-current, precision point-of-load applications.
Availability
LP3876ESX-2.5/NOPB is available at Aetrix Electronics and suitable for microprocessor core power, GTL bus termination, DSP supply, SCSI termination, and post-regulation applications requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LP3876ESX-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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management ICs with broad industrial, automotive, and communications reach.
The LP3876 series belongs to TI's ultra-low-dropout linear regulator product line, engineered specifically for high-current, low-voltage digital system power where precision regulation, fast transient response, and thermal robustness are essential.
FAQ
What is the minimum input voltage required for LP3876ESX-2.5/NOPB to regulate 2.5V output at 3A?
The minimum input voltage is determined by dropout: LP3876ESX-2.5/NOPB requires VIN ≥ VOUT + VDROP. With 800mV typical dropout at 3A, LP3876ESX-2.5/NOPB needs at least 3.3V input to maintain regulation. The absolute minimum operating VIN is 2.5V, but that only applies at lighter loads where dropout is lower - full 3A operation mandates higher headroom.
Does LP3876ESX-2.5/NOPB require an external pull-up resistor on the SD pin?
Yes - LP3876ESX-2.5/NOPB requires a 10kΩ pull-up resistor from SD to VIN for reliable startup and default-enable operation. If the SD signal is actively driven high/low by a CMOS rail-to-rail source, the resistor may be omitted. Leaving SD floating risks undefined shutdown state and potential malfunction.
Can the SENSE pin of LP3876ESX-2.5/NOPB be left unconnected?
No - the SENSE pin must not be left floating. If remote sensing is unused, LP3876ESX-2.5/NOPB requires SENSE to be connected directly to VOUT. An open SENSE pin causes regulation instability and potential output voltage error, as the internal error amplifier lacks a valid feedback reference.
What is the maximum allowable ESR for the output capacitor used with LP3876ESX-2.5/NOPB?
LP3876ESX-2.5/NOPB is stable with output capacitors having ESR between ~10mΩ and 1Ω, depending on capacitance value. For 10µF tantalum, optimal ESR is ~0.1Ω; ceramic capacitors (with ESR <10mΩ) require ≥10µF and careful dielectric selection (X7R/X5R recommended). The stability curve in Figure 22 of the datasheet defines the exact stable region.
How does the ERROR flag on LP3876ESX-2.5/NOPB behave during shutdown?
During shutdown (SD pin low), the ERROR flag on LP3876ESX-2.5/NOPB is forced invalid - it does not reflect output status and should not be monitored. The flag resumes normal operation only after SD returns high and the device completes its 25µs turn-on delay. This prevents false fault reporting during power sequencing.
LP3876ESX-2.5/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:
- 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):
- 5 mA
- Current - Supply (Max):
- 15 mA
- PSRR:
- -
- 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)
LP3876ESX-2.5/NOPB FAQ
1.How can I place an order for LP3876ESX-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3876ESX-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 LP3876ESX-2.5/NOPB reliable?
The price and inventory of LP3876ESX-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 LP3876ESX-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LP3876ESX-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3876ESX-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3876ESX-2.5/NOPB?
LP3876ESX-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3876ESX-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 LP3876ESX-2.5/NOPB?
For technical support, including LP3876ESX-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3876ESX-2.5/NOPB requirements.
6.How does Aetrix verify that LP3876ESX-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3876ESX-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 LP3876ESX-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LP3876ESX-2.5/NOPB?
All LP3876ESX-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3876ESX-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 LP3876ESX-2.5/NOPB part is unused and in its original packaging.
Return procedure for LP3876ESX-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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