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Texas Instruments LP3871ESX-3.3/NOPB
- Part No.:
- LP3871ESX-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LP3871ESX-3.3/NOPB.pdf
- Description:
- IC REG LINEAR 3.3V 800MA DDPAK
- Quantity:
- Payment:
- Shipping:
Inventory:160
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Product details
Overview
LP3871ESX-3.3/NOPB from Texas Instruments is a 3.3-V, 0.8-A ultra-low-dropout linear regulator in SOT-223 package, featuring 240 mV dropout at full load, ±1.5% output voltage accuracy, and 10 nA shutdown quiescent current. It delivers fast transient response for microprocessor core supplies and battery-powered systems requiring stable low-voltage regulation.
For engineers reviewing the LP3871ESX-3.3/NOPB datasheet, LP3871ESX-3.3/NOPB pinout, LP3871ESX-3.3/NOPB application, or LP3871ESX-3.3/NOPB equivalent, key selection criteria include dropout performance at 800 mA, ERROR flag behavior under 10% output sag, ground current vs. load, thermal resistance (RθJA = 65.2°C/W), and compatibility with 10 µF tantalum output capacitors.
Technical Context
The LP3871ESX-3.3/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 loop gain to achieve 0.04% load regulation and 0.02% line regulation.
It integrates an open-drain ERROR flag that asserts low when VOUT falls ≥10% below nominal, with 5% hysteresis and 1 µs reset delay. Shutdown is controlled by a logic-compatible SD pin with 1 nA input leakage and 20 µs turnoff delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±1.5% at 25°C; ±3% over −40°C to +125°C junction range |
| Max Output Current | 0.8 A DC continuous; peak current limited to 1 A |
| Dropout Voltage | 240 mV typical at 0.8 A load - enables operation with VIN as low as 3.54 V |
| Quiescent Current | 6 mA typical in active mode; 10 nA in shutdown - critical for battery runtime |
| Ground Pin Current | 6 mA at 0.8 A load - directly impacts PCB thermal design and power loss |
| PSRR | 73 dB at 120 Hz with VIN = VOUT + 1 V - suppresses upstream switching noise |
| Thermal Resistance | RθJA = 65.2°C/W (SOT-223) - defines max power dissipation before thermal shutdown |
Pinout & Package
SOT-223 (5-pin) package with exposed thermal pad (6.50 mm × 3.56 mm body); pin 1 is SD, pin 2 is IN, pin 3 is OUT, pin 4 is ERROR, pin 5 is GND. The exposed pad must be soldered to PCB copper for thermal conduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SD (Pin 1) | Shutdown control input | CMOS-compatible logic input; pull high via 10-kΩ resistor; pulls device into 10-nA shutdown state when low |
| IN (Pin 2) | Input voltage supply | Accepts 2.5 V to 7 V; powers internal circuitry and PMOS pass element |
| OUT (Pin 3) | Regulated output | Delivers 3.3 V to load; requires 10 µF minimum output capacitor with ESR 100 mΩ–4 Ω |
| ERROR (Pin 4) | Open-drain fault indicator | Sinks up to 1 mA when VOUT drops ≥10%; requires external pullup; disabled during shutdown |
| GND (Pin 5) | Power and signal reference | Common return path for IN, OUT, SD, and ERROR; connects to thermal pad for heat dissipation |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 240 mV at 0.8 A enables use with single-cell Li-ion or 3.3-V system rails |
| Fast transient response | Stabilizes within microseconds after load step - essential for microprocessor core supply |
| Integrated ERROR flag | Monitors output voltage in real time with 10% threshold and 5% hysteresis for reliable fault detection |
| Low-noise operation | 150 µVRMS output noise (10 Hz–100 kHz) supports noise-sensitive analog circuits |
| Robust protection | Short-circuit current limit (2.3 A), thermal shutdown, and reverse-current diode (200 mA continuous) |
Applications
| Microprocessor Core Supply | GTL/GTL+ Bus Termination |
|---|---|
Use Scenario: Powers 3.3-V I/O domains of embedded microcontrollers and FPGAs in portable instrumentation. IC Role / Device Role / Timing Role: Primary LDO delivering clean, regulated 3.3 V with fast load-step recovery to prevent logic glitches during burst-mode operation. Use Value: 240 mV dropout allows operation from 3.54 V input - extends battery life in coin-cell or single-LiFePO₄ systems. | Use Scenario: Provides precision termination voltage for GTL, GTL+, and SSTL-2 bus interfaces in telecom backplanes. IC Role / Device Role / Timing Role: Stable 3.3-V reference source ensuring signal integrity and timing margin compliance across temperature. Use Value: ±1.5% initial accuracy and 0.04% load regulation maintain bus voltage within JEDEC-specified tolerance bands. |
| Post-Regulator for Switching Supplies | Battery-Powered Medical Sensors |
Use Scenario: Follows a buck converter to reduce ripple and noise in sensitive analog subsystems (e.g., ADC references). IC Role / Device Role / Timing Role: Low-noise linear post-regulator suppressing switching artifacts above 100 kHz using its 150 µVRMS noise floor. Use Value: 73 dB PSRR at 120 Hz attenuates fundamental switching ripple; 10 µF output cap ensures stability without complex compensation. | Use Scenario: Powers wearable ECG/PPG sensor nodes operating continuously from CR2032 or Li-SOCl₂ batteries. IC Role / Device Role / Timing Role: Always-on LDO with 10 nA shutdown current minimizing standby drain during sleep cycles. Use Value: 10 nA shutdown IQ extends shelf life and operational runtime - critical for multi-year implantable or remote deployments. |
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 3.3 V, 150-mA output, no ERROR flag, RθJA = 120°C/W | Limited to low-power logic; lacks fault monitoring and high-current capability | Select only for space-constrained, sub-100-mA applications where ERROR flag is unnecessary |
| TPS79633DCQ | 3.3 V, 600-mA, 125-mV dropout at 600 mA, integrated enable and power-good | Lower current rating; no SENSE pin; different pinout and thermal profile | Prefer for designs needing tighter dropout or PG signaling, but verify thermal derating at 0.8 A |
Compared with LP3871ESX-3.3/NOPB, TSS721AIDR sacrifices current capacity and diagnostics for smaller footprint, while TPS79633DCQ trades full 0.8-A delivery and ERROR flag for lower dropout and power-good functionality - neither offers pin compatibility or identical thermal behavior.
Availability
LP3871ESX-3.3/NOPB is available at Aetrix Electronics and suitable for microprocessor core supplies, GTL bus terminators, and battery-powered medical sensors requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for LP3871ESX-3.3/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 consumer reach.
The LP387x series was designed specifically for high-current, ultra-low-dropout regulation in battery-powered and noise-sensitive applications - emphasizing fast transient response, minimal quiescent current in shutdown, and robust thermal performance in compact packages.
FAQ
What is the minimum input voltage required for LP3871ESX-3.3/NOPB to regulate 3.3 V at 0.8 A?
The LP3871ESX-3.3/NOPB requires a minimum input voltage of 3.54 V to maintain regulation at 0.8 A, based on its typical 240 mV dropout voltage. At light loads (80 mA), dropout drops to 24 mV, allowing operation down to 3.324 V. The absolute minimum input is 2.5 V per datasheet, but regulation fails below VOUT + VDROPOUT.
Does LP3871ESX-3.3/NOPB require an external sense resistor or feedback network?
No, LP3871ESX-3.3/NOPB is a fixed-output regulator with internal feedback; it does not require external resistors. Unlike the LP3874 variant, it lacks a SENSE pin and regulates voltage solely at the OUT pin. For remote load regulation, the LP3874ESX-3.3/NOPB would be required instead.
How does the ERROR flag on LP3871ESX-3.3/NOPB behave during shutdown?
When the SD pin is pulled low, the ERROR flag on LP3871ESX-3.3/NOPB is forced invalid and ceases to reflect output status - this is intentional to minimize power consumption. The ERROR pin becomes high-impedance and must be externally pulled high or grounded if unused; it does not assert or deassert during shutdown.
What output capacitor types are recommended for stable operation of LP3871ESX-3.3/NOPB?
Tantalum capacitors are recommended for LP3871ESX-3.3/NOPB's output due to their stable ESR (100 mΩ–4 Ω) across temperature. Ceramic capacitors may be used if X7R/X5R dielectric and ≥10 µF capacitance are selected, but Z5U/Y5V types are unsuitable due to severe voltage/temperature drift. Aluminum electrolytics require careful ESR validation at −40°C.
Can LP3871ESX-3.3/NOPB safely handle reverse current from the output to input?
Yes - LP3871ESX-3.3/NOPB contains an inherent parasitic body diode in its PMOS pass element. It can safely conduct up to 200 mA continuous or 1 A peak from OUT to IN if the output is forced above the input, provided external current limiting is implemented to stay within those limits.
LP3871ESX-3.3/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):
- 3.3V
- 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-3.3/NOPB FAQ
1.How can I place an order for LP3871ESX-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3871ESX-3.3/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-3.3/NOPB reliable?
The price and inventory of LP3871ESX-3.3/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-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LP3871ESX-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3871ESX-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3871ESX-3.3/NOPB?
LP3871ESX-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3871ESX-3.3/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-3.3/NOPB?
For technical support, including LP3871ESX-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3871ESX-3.3/NOPB requirements.
6.How does Aetrix verify that LP3871ESX-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3871ESX-3.3/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-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LP3871ESX-3.3/NOPB?
All LP3871ESX-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3871ESX-3.3/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-3.3/NOPB part is unused and in its original packaging.
Return procedure for LP3871ESX-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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