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Texas Instruments LP3871EMP-1.8/NOPB
- Part No.:
- LP3871EMP-1.8/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-261-5, TO-261AB
- Datasheet:
-
LP3871EMP-1.8/NOPB.pdf
- Description:
- IC REG LIN 1.8V 800MA SOT223-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,800
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Product details
Overview
LP3871EMP-1.8/NOPB from Texas Instruments is a 0.8-A ultra-low-dropout linear regulator in SOT-223 package, delivering a fixed 1.8-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 low-voltage bus termination.
For engineers reviewing the LP3871EMP-1.8/NOPB datasheet, LP3871EMP-1.8/NOPB pinout, LP3871EMP-1.8/NOPB application, or LP3871EMP-1.8/NOPB equivalent, key selection criteria include dropout performance under 0.8-A load, ERROR flag behavior for undervoltage detection, thermal limits in SOT-223, and compatibility with 10-µF tantalum output capacitors per TI SNVS225H Rev H.
Technical Context
The LP3871EMP-1.8/NOPB uses a CMOS-based PMOS pass element enabling ultra-low dropout voltage independent of load current variation, with internal thermal shutdown and short-circuit protection active across −40°C to +125°C junction temperature range. Its ERROR flag provides open-drain undervoltage indication at 10% VOUT drop with 5% hysteresis.
Unlike the LP3874 variant, the LP3871EMP-1.8/NOPB lacks a SENSE pin and regulates voltage at the OUT pin only - making it suitable for local regulation where trace resistance is negligible. Shutdown is controlled via TTL/CMOS-compatible SD pin requiring external 10-kΩ pullup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±1.5% (25°C), ±3% over full temperature/load/line range - ensures stable core supply for 1.8-V logic and memory interfaces. |
| Max Output Current | 0.8 A DC continuous - supports single-core microprocessors, DSPs, and GTL+/SSTL terminators without derating at 25°C. |
| Dropout Voltage | 240 mV typical at 0.8-A load - enables operation from 2.04-V input minimum, critical for battery-powered systems near end-of-discharge. |
| Ground Pin Current | 6 mA typical at 0.8-A load - low bias current minimizes total system power loss in high-current LDO applications. |
| Shutdown Quiescent Current | 10 nA typical - reduces standby battery drain in always-on embedded devices such as IoT sensors and real-time clocks. |
| ERROR Flag Threshold | 10% VOUT drop (180 mV at 1.8 V) with 5% hysteresis - provides reliable brownout detection without chatter during transient line sags. |
| Input Voltage Range | 2.5 V to 7 V - compatible with single-cell Li-ion (3.0–4.2 V), dual-cell alkaline (2.4–3.2 V), and 3.3/5-V rail post-regulation. |
Pinout & Package
SOT-223 (5-pin) package with exposed thermal pad (6.50 mm × 3.56 mm body size); pin 1 = SD, pin 2 = IN, pin 3 = OUT, pin 4 = ERROR, pin 5 = GND. Thermal resistance RθJA = 65.2°C/W - requires PCB copper pour under thermal pad for >0.5-A operation above 60°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SD (Pin 1) | Shutdown control input | Active-low TTL/CMOS-compatible enable; must be pulled high via 10-kΩ resistor; drives device into 10-nA shutdown state when low. |
| IN (Pin 2) | Main input voltage supply | Accepts 2.5–7 V; powers internal bias circuitry and PMOS pass element; includes reverse-current protection diode (200-mA max forward). |
| OUT (Pin 3) | Regulated output voltage | Delivers 1.8 V ±1.5%; requires ≥10-µF tantalum output capacitor with ESR 100 mΩ–4 Ω for stability; no SENSE pin support. |
| ERROR (Pin 4) | Open-drain fault indicator | Sinks up to 1 mA when VOUT drops ≥10%; requires external pullup; invalid during shutdown; used for system-level brownout signaling. |
| GND (Pin 5) | Power ground reference | Common return for IN, OUT, SD, and ERROR; connects to thermal pad; must be low-impedance plane for thermal and noise performance. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout architecture | 24 mV @ 80 mA / 240 mV @ 0.8 A - enables operation from inputs as low as 2.04 V, extending usable battery life in portable systems. |
| Integrated ERROR flag | 10% VOUT threshold with 5% hysteresis - eliminates need for external supervisor IC in space-constrained microprocessor power rails. |
| CMOS process design | Quiescent current independent of load - maintains 6 mA GND current at full 0.8-A load, unlike bipolar LDOs whose bias rises with output current. |
| Robust protection suite | Thermal shutdown + short-circuit limiting + reverse-current diode - allows safe operation in unregulated input environments like battery+DC-DC hybrid supplies. |
| Wide temperature range | −40°C to +125°C junction rating - qualified for automotive under-hood, industrial motor control, and telecom base station applications. |
Applications
| Microprocessor Core Supply | GTL+/SSTL Bus Termination |
|---|---|
|
Use Scenario: Powering ARM Cortex-M4 or RISC-V MCU cores requiring clean, low-noise 1.8-V supply with fast transient response. IC Role / Device Role / Timing Role: Primary voltage regulator delivering stable 1.8-V rail; ERROR flag monitors brownout during sleep-mode wake-up sequences. Use Value: 240-mV dropout enables use with partially discharged Li-ion batteries; 10-nA shutdown preserves RTC backup power for >10 years. |
Use Scenario: Providing matched 1.8-V termination voltage for DDR3/LPDDR2 address/control buses operating at 400–800 MT/s. IC Role / Device Role / Timing Role: Precision voltage reference source for parallel bus termination networks; low output noise (<150 µVRMS) prevents timing jitter. Use Value: ±1.5% output accuracy ensures <10-mV VTT deviation across temperature, meeting JEDEC SSTL_18 specification limits. |
| DSP Power Management | Battery-Powered Sensor Hub |
|
Use Scenario: Supplying TI C5000 or Analog Devices SHARC DSPs during burst-mode processing with dynamic current demand up to 0.8 A. IC Role / Device Role / Timing Role: High-current LDO with fast load-step response (<25 µs turnon delay) maintaining voltage during instruction fetch bursts. Use Value: 0.04% load regulation minimizes supply-induced distortion in analog front-end sampling; 73-dB PSRR suppresses switching noise from adjacent DC-DC converters. |
Use Scenario: Regulating power for BLE/Wi-Fi sensor nodes powered by CR2032 coin cell or single Li-SOCl₂ primary battery. IC Role / Device Role / Timing Role: Always-on system regulator with shutdown control synchronized to MCU sleep states; ERROR flag triggers wake-up on voltage sag. Use Value: 10-nA shutdown IQ extends shelf life beyond 5 years; SOT-223 footprint fits sub-100-mm² wearable PCBs with minimal thermal mass. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TSS721AIPW | Fixed 1.8-V output, 1-A rating, 300-mV dropout at 1 A, no ERROR flag, SOIC-8 package | Lacks undervoltage monitoring; higher dropout limits use with ≤3.0-V inputs; larger footprint increases board area | Select when higher current headroom is needed and brownout signaling is handled externally. |
| TPS7A2018PDQNR | Fixed 1.8-V output, 300-mA rating, 170-mV dropout at 300 mA, 25-µA quiescent current, X2SON-4 package | Lower current capability; no ERROR pin; smaller package unsuitable for >0.5-A thermal dissipation | Select for ultra-low-power, space-constrained applications where 300-mA peak load suffices and fault reporting is not required. |
Compared with TSS721AIPW and TPS7A2018PDQNR, the LP3871EMP-1.8/NOPB uniquely balances 0.8-A capability, 240-mV dropout, integrated ERROR flag, and SOT-223 thermal performance - making it optimal for mid-power embedded systems needing both robustness and fault visibility.
Availability
LP3871EMP-1.8/NOPB is available at Aetrix Electronics and suitable for microprocessor core supplies, GTL+/SSTL bus terminators, and battery-powered sensor hubs requiring stable component supply with long-term lifecycle assurance.
Supply support for LP3871EMP-1.8/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, designing and manufacturing analog ICs, embedded processors, and digital signal processors for industrial, automotive, and consumer markets.
The LP387x series was developed to address ultra-low-dropout requirements in battery-powered and high-efficiency linear regulation applications - specifically targeting microprocessor core rails, memory I/O termination, and portable instrumentation where precision, low IQ, and fault visibility are critical.
FAQ
What is the minimum input voltage required for LP3871EMP-1.8/NOPB to regulate 1.8 V at 0.8-A load?
The LP3871EMP-1.8/NOPB requires a minimum input voltage of 2.04 V (1.8 V + 240 mV dropout) to maintain regulation at 0.8-A load. Per TI SNVS225H Section 6.3, the absolute minimum VIN is 2.5 V unless dropout condition dictates higher - so actual startup requires ≥2.5 V, but steady-state operation sustains down to 2.04 V if input remains stable.
Does LP3871EMP-1.8/NOPB support remote sensing like the LP3874?
No, LP3871EMP-1.8/NOPB does not support remote sensing. It lacks a SENSE pin and regulates voltage solely at the OUT pin. The LP3874 variant includes a dedicated SENSE pin for improved load regulation at remote points; LP3871EMP-1.8/NOPB is intended for local regulation where PCB trace resistance is negligible.
How should the ERROR pin of LP3871EMP-1.8/NOPB be connected in a system that does not require fault monitoring?
If the ERROR function is unused, the ERROR pin of LP3871EMP-1.8/NOPB must be connected directly to ground per TI SNVS225H Section 8.2. This disables the open-drain output and prevents floating node issues. Leaving it unconnected risks noise coupling and undefined logic states during transients.
What output capacitor type and value are required for stable operation of LP3871EMP-1.8/NOPB?
LP3871EMP-1.8/NOPB requires a minimum 10-µF output capacitor with ESR between 100 mΩ and 4 Ω. Tantalum capacitors are recommended for stability; ceramic capacitors may be used if ESR is within range and voltage/temperature derating is applied. Aluminum electrolytics are discouraged due to ESR drift at low temperatures.
Is LP3871EMP-1.8/NOPB pin-compatible with other devices in the LP387x family?
LP3871EMP-1.8/NOPB shares the same 5-pin SOT-223 pinout (SD/IN/OUT/ERROR/GND) with other LP3871 variants (e.g., LP3871EMP-2.5/NOPB), but is not pin-compatible with LP3874 due to SENSE pin placement. Substituting LP3874 for LP3871EMP-1.8/NOPB requires PCB layout changes to accommodate the relocated SENSE pin (Pin 4 → Pin 5).
LP3871EMP-1.8/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-261-5, TO-261AB
- 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):
- 1.8V
- 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:
- SOT-223-5
LP3871EMP-1.8/NOPB FAQ
1.How can I place an order for LP3871EMP-1.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3871EMP-1.8/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 LP3871EMP-1.8/NOPB reliable?
The price and inventory of LP3871EMP-1.8/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3871EMP-1.8/NOPB is usually 5 days.
3.What payment methods are accepted for LP3871EMP-1.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3871EMP-1.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3871EMP-1.8/NOPB?
LP3871EMP-1.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3871EMP-1.8/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 LP3871EMP-1.8/NOPB?
For technical support, including LP3871EMP-1.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3871EMP-1.8/NOPB requirements.
6.How does Aetrix verify that LP3871EMP-1.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3871EMP-1.8/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 LP3871EMP-1.8/NOPB meets industry standards.
7.What is the process for return or replacement of LP3871EMP-1.8/NOPB?
All LP3871EMP-1.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3871EMP-1.8/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 LP3871EMP-1.8/NOPB part is unused and in its original packaging.
Return procedure for LP3871EMP-1.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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