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Texas Instruments LP3871ESX-2.5/NOPB
- Part No.:
- LP3871ESX-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LP3871ESX-2.5/NOPB.pdf
- Description:
- IC REG LINEAR 2.5V 800MA DDPAK
- Quantity:
- Payment:
- Shipping:
Inventory:498
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Product details
Overview
LP3871ESX-2.5/NOPB from Texas Instruments is a 0.8-A ultra-low-dropout linear regulator in SOT-223 package, delivering a fixed 2.5 V output with ±1.5% accuracy at room temperature, 24 mV typical dropout at 80 mA, and 10 nA shutdown quiescent current - designed for microprocessor core power and battery-powered systems requiring fast transient response and stable low-voltage regulation.
For engineers reviewing the LP3871ESX-2.5/NOPB datasheet, LP3871ESX-2.5/NOPB pinout, LP3871ESX-2.5/NOPB application, or LP3871ESX-2.5/NOPB equivalent, key selection criteria include dropout voltage under 0.8-A load, ERROR flag behavior at 10% VOUT drop, ground current vs. load, thermal performance in SOT-223, and compatibility with 10-µF tantalum output capacitors.
Technical Context
The LP3871ESX-2.5/NOPB uses a CMOS-based PMOS pass element enabling ultra-low dropout and load-independent quiescent current. Its internal error amplifier drives the pass transistor with high gain and bandwidth to achieve <25 µs turn-on delay and rapid recovery from load transients up to 0.8 A.
It integrates an open-drain ERROR flag that asserts low when output falls >10% below nominal (with 5% hysteresis), and a logic-controlled SD pin requiring external 10-kΩ pullup. Unlike the LP3874 variant, it lacks a SENSE pin and regulates voltage only at the OUT pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5 V ±1.5% (25°C), ±3% over −40°C to +125°C - ensures stable core supply for 2.5-V logic and analog subsystems. |
| Max Output Current | 0.8 A DC - supports single-core microprocessors, DSPs, and bus terminators without external current boosting. |
| Dropout Voltage | 240 mV at 0.8 A - enables operation from 2.75 V input while maintaining regulation, critical for Li-ion (3.0–3.6 V) and multi-cell alkaline systems. |
| Quiescent Current | 10 nA in shutdown mode - minimizes battery drain in always-on standby applications like real-time clocks and sensor nodes. |
| Ground Pin Current | 6 mA at 0.8 A load - low and stable, reducing PCB trace heating and simplifying thermal design in compact layouts. |
| PSRR | 73 dB at 120 Hz (VIN = VOUT + 1 V) - suppresses ripple from upstream switching regulators or noisy DC/DC stages. |
| Operating Input Range | 2.5 V to 7 V - compatible with single Li-ion, 3.3-V rail post-regulation, and industrial 5-V/6-V supplies. |
Pinout & Package
SOT-223 (5-pin) package: 6.50 mm × 3.56 mm body, exposed thermal pad on bottom (pin 5 = GND), rated RθJA = 65.2°C/W - requires minimum 250 mm² copper pour for 0.8-A continuous operation at +85°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SD) | Shutdown control input | CMOS-compatible active-low enable; must be pulled high via 10-kΩ resistor; drives device into 10-nA shutdown state when low. |
| 2 (IN) | Input voltage supply | Accepts 2.5–7 V; connects to upstream source; internal parasitic diode allows reverse current up to 200 mA if VOUT > VIN. |
| 3 (OUT) | Regulated output | Delivers 2.5 V ±1.5%; directly powers load; voltage sensed here (no remote sense capability). |
| 4 (ERROR) | Open-drain fault flag | Asserts low when VOUT drops >10% below 2.5 V; requires external 10-kΩ pullup; disabled during shutdown. |
| 5 (GND) | Power and signal reference | Common return for IN, OUT, SD, ERROR; thermally connected to exposed pad; must be low-impedance plane. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 24 mV at 80 mA and 240 mV at 0.8 A - enables high-efficiency regulation near battery end-of-life or low-input-rail conditions. |
| Fast transient response | <25 µs turn-on delay and sub-10-µs error flag assertion - maintains system stability during processor wake-up or burst-load events. |
| Load regulation | 0.04% over 10 mA–0.8 A - holds output within ±1 mV across full load range, critical for precision ADC references and PLL supplies. |
| Thermal & current protection | Integrated overtemperature and short-circuit foldback - prevents damage during overload or poor heatsinking without external circuitry. |
| Low-noise operation | 150 µVRMS (10 Hz–100 kHz) - suitable for noise-sensitive analog circuits including RF front-ends and audio codecs. |
Applications
| Microprocessor Core Supply | GTL/GTL+ Bus Termination |
|---|---|
|
Use Scenario: Powering 2.5-V I/O domains of embedded microcontrollers (e.g., TI MSP430, ST STM32L) from single-cell Li-ion or 3.3-V rails. IC Role / Device Role / Timing Role: Primary LDO providing clean, low-noise 2.5-V supply with fast load-step response to handle CPU core current spikes. Use Value: Maintains regulation down to 2.75-V input, avoids brownout resets during battery discharge, and eliminates need for external sequencing. |
Use Scenario: Providing termination voltage for GTL/GTL+ signaling buses in telecom line cards and server backplanes. IC Role / Device Role / Timing Role: Precision 2.5-V reference source with tight load regulation to ensure consistent bus voltage margin across varying channel loads. Use Value: 0.04% load regulation guarantees <±1 mV shift over 0–0.8 A, preserving signal integrity and timing margins in high-speed parallel interfaces. |
| SCSI Terminator Power | Battery-Powered Sensor Node |
|
Use Scenario: Supplying 2.5-V termination for legacy SCSI-2/3 differential buses in industrial storage controllers. IC Role / Device Role / Timing Role: Low-noise, stable voltage source replacing discrete Zener/resistor networks to improve termination accuracy and EMI immunity. Use Value: 150 µVRMS output noise prevents false triggering in sensitive differential receivers; 10-nA shutdown extends shelf life of field-deployed units. |
Use Scenario: Regulating power for ultra-low-power IoT sensors (e.g., temperature, humidity) operating from coin-cell or small Li-Po batteries. IC Role / Device Role / Timing Role: Always-on LDO with nanoscale quiescent current, enabling multi-year operation in sleep-wake cycles. Use Value: 10-nA shutdown IQ reduces annual battery drain to <1 µAh, while ERROR flag enables early low-battery warning before system failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TSS721AIDR | Fixed 2.5 V, 150-mA output, 120 mV dropout at 150 mA, no ERROR flag, SOIC-8 package. | Limited to low-current peripherals; lacks fault reporting and high-current capability. | Select when cost and board space outweigh need for 0.8-A delivery or system-level fault monitoring. |
| TPS7A2025PDQNR | Fixed 2.5 V, 300-mA output, 130 mV dropout at 300 mA, 25-µA quiescent current, no ERROR flag, X2SON-4 package. | Higher IQ in active mode; no fault indication; unsuitable for >300-mA loads or safety-critical monitoring. | Choose for space-constrained, low-power apps where ERROR flag and 0.8-A headroom are unnecessary. |
Compared with TSS721AIDR and TPS7A2025PDQNR, LP3871ESX-2.5/NOPB uniquely delivers 0.8-A output with integrated ERROR flag and nanoscale shutdown current in a thermally capable SOT-223 package - making it the only option among the three for high-current, fault-aware, battery-critical designs.
Availability
LP3871ESX-2.5/NOPB is available at Aetrix Electronics and suitable for microprocessor core supplies, GTL bus terminators, SCSI termination circuits, and battery-powered sensor nodes requiring stable component supply across long-lifecycle industrial and medical programs.
Supply support for LP3871ESX-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 LDO design heritage and broad automotive/industrial qualification.
The LP387x series was developed to address ultra-low-dropout, high-accuracy, and fast-transient needs in portable and embedded systems - specifically targeting microprocessor, memory, and interface power domains where efficiency and reliability are non-negotiable.
FAQ
What is the minimum input voltage required for LP3871ESX-2.5/NOPB to regulate at full 0.8-A load?
The LP3871ESX-2.5/NOPB requires a minimum input voltage of 2.74 V to maintain regulation at 0.8-A load, calculated as VOUT + VDROPOUT = 2.5 V + 240 mV. Below this, output voltage sags; the absolute minimum survival input is −0.3 V, but functional operation begins at 2.5 V per datasheet limits. LP3871ESX-2.5/NOPB cannot regulate at 0.8 A with inputs below 2.74 V.
Does LP3871ESX-2.5/NOPB support remote voltage sensing like the LP3874?
No, LP3871ESX-2.5/NOPB does not include a SENSE pin and regulates voltage only at the OUT pin. Remote load regulation requires routing feedback from the load point - which LP3871ESX-2.5/NOPB cannot perform. For remote-sense applications, the LP3874 variant (e.g., LP3874ESX-2.5) must be used instead. LP3871ESX-2.5/NOPB is optimized for local regulation with minimal layout complexity.
How should the ERROR pin of LP3871ESX-2.5/NOPB be interfaced in a microcontroller system?
The ERROR pin of LP3871ESX-2.5/NOPB is open-drain and must be pulled high with a 10-kΩ resistor to VIN or VCC. It asserts low when VOUT drops >10% below 2.5 V (i.e., <2.25 V), with 5% hysteresis. Connect it directly to a GPIO interrupt pin on the MCU; avoid connecting to ground unless unused. LP3871ESX-2.5/NOPB disables ERROR during shutdown, so monitoring is only valid in active mode.
What output capacitor is recommended for stable operation of LP3871ESX-2.5/NOPB at 0.8-A load?
A 10-µF solid tantalum capacitor with ESR between 100 mΩ and 4 Ω is recommended for LP3871ESX-2.5/NOPB at full load. Ceramic capacitors may be used if X7R/X5R dielectric and ≥10 µF are selected, but must be verified for voltage coefficient and temperature drift. Aluminum electrolytics are discouraged due to high low-temp ESR. LP3871ESX-2.5/NOPB becomes unstable outside the specified ESR range.
Can LP3871ESX-2.5/NOPB be used in automotive applications?
LP3871ESX-2.5/NOPB is qualified for −40°C to +125°C junction temperature and meets JEDEC JESD22-A114 reliability standards, but it is not AEC-Q200 qualified or automotive-grade screened. It has been deployed in non-safety-critical automotive infotainment and body electronics, but TI does not guarantee automotive qualification. For ASIL-B/C systems, LP3871ESX-2.5/NOPB is not approved; consult TI's automotive LDO portfolio for qualified alternatives.
LP3871ESX-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):
- 0.35V @ 800mA
- Current - Output:
- 800mA
- Current - Quiescent (Iq):
- 5 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)
LP3871ESX-2.5/NOPB FAQ
1.How can I place an order for LP3871ESX-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3871ESX-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 LP3871ESX-2.5/NOPB reliable?
The price and inventory of LP3871ESX-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 LP3871ESX-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LP3871ESX-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3871ESX-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3871ESX-2.5/NOPB?
LP3871ESX-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3871ESX-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 LP3871ESX-2.5/NOPB?
For technical support, including LP3871ESX-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3871ESX-2.5/NOPB requirements.
6.How does Aetrix verify that LP3871ESX-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3871ESX-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 LP3871ESX-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LP3871ESX-2.5/NOPB?
All LP3871ESX-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3871ESX-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 LP3871ESX-2.5/NOPB part is unused and in its original packaging.
Return procedure for LP3871ESX-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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