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Texas Instruments LP3881ESX-1.8/NOPB
- Part No.:
- LP3881ESX-1.8/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LP3881ESX-1.8/NOPB.pdf
- Description:
- IC REG LINEAR 1.8V 800MA DDPAK
- Quantity:
- Payment:
- Shipping:
Inventory:743
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Product details
Overview
LP3881ESX-1.8/NOPB from Texas Instruments is a 0.8A ultra-low-dropout linear regulator with N-MOS pass transistor architecture, delivering 1.8V output at ±1.5% accuracy over temperature, 75 mV typical dropout at full load, and 60 nA shutdown current - designed for DSP core supplies, SMPS post-regulation, and microcontroller I/O rails where bias-rail efficiency and fast transient response are critical.
For engineers reviewing the LP3881ESX-1.8/NOPB datasheet, LP3881ESX-1.8/NOPB pinout, LP3881ESX-1.8/NOPB application, or LP3881ESX-1.8/NOPB equivalent, key selection criteria include VBIAS rail dependency (4.5–6V), SOIC-8/TO-263 package thermal limits, minimum 4.7 µF output capacitance with ESR stability constraints, and absence of integrated enable pull-up.
Technical Context
The LP3881ESX-1.8/NOPB employs a CMOS-based N-MOS pass transistor driven by an external VBIAS rail, enabling operation with input voltages as low as VOUT + VDO (1.875V typ). Its architecture delivers wide bandwidth and minimal external capacitance requirements while maintaining stability with tantalum output capacitors in the 4.7–100 µF range and ESR between 0.001–1 Ω.
It integrates over-temperature and over-current protection, supports shutdown via S/D pin with 0.7V turn-off threshold, and achieves 150 µVrms output noise (10 Hz–100 kHz) and 80 dB PSRR at 120 Hz on VIN. Ground current remains stable across load (3 mA typ at 0.8A), independent of output current due to CMOS quiescent design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.8V ±1.5% at 25°C; ensures stable core voltage for 1.8V logic families without external feedback resistors. |
| Dropout Voltage | 75 mV typ @ 0.8A (TO-263); enables regulation from 1.875V input, critical for battery-powered or post-SMPS applications. |
| Quiescent Current | 60 nA typ in shutdown; reduces system standby power in always-on embedded nodes. |
| Load Regulation | 0.04%/A; maintains ≤72 µV output shift per 100 mA load change, supporting precision analog subsystems. |
| Thermal Range | −40°C to +125°C junction; validated for industrial and automotive under-hood environments with proper PCB heatsinking. |
| Output Capacitance | Min 4.7 µF tantalum; defines minimum bulk capacitance needed for loop stability-ceramic-only use prohibited. |
| VBIAS Requirement | 4.5V to 6V; must be supplied externally to drive N-MOS gate; enables ultra-low VIN operation but adds system rail complexity. |
Pinout & Package
LP3881ESX-1.8/NOPB is packaged in DDPAK/TO-263 (KTT), a 5-pin surface-mount package with exposed thermal pad. The package provides θJA ≈ 40°C/W when soldered to ≥1.5 in² copper plane, enabling 1.2W dissipation at 25°C ambient before thermal shutdown.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VIN | Main power input | Supplies load current; must be ≥ VOUT + VDO and ≤5.5V; requires ≥4.7 µF ceramic input capacitor. |
| 2: GND | Analog ground reference | Common return for VIN, VOUT, and internal circuitry; must connect directly to clean analog ground plane. |
| 3: S/D | Shutdown control input | Active-low enable; pulled high via 10–100 kΩ resistor; 0.7V threshold ensures reliable turn-off with standard logic levels. |
| 4: VBIAS | Bias supply input | Drives N-MOS gate; must be 4.5–6V; requires 0.1 µF bypass capacitor; undervoltage lockout engages below ~4V. |
| 5: VOUT | Regulated output | Delivers 1.8V; requires ≥4.7 µF tantalum output capacitor with ESR 0.001–1 Ω; no ceramic-only configuration allowed. |
Key Features
| Feature | Design Value |
|---|---|
| N-MOS pass transistor | Enables ultra-low dropout and wide bandwidth without sacrificing stability-eliminates need for PNP/P-FET trade-offs in low-VIN apps. |
| External VBIAS rail | Decouples gate drive from main input, allowing VIN as low as 1.875V while maintaining full 0.8A output capability. |
| 60 nA shutdown current | Reduces system-level leakage in battery-backed or energy-harvesting designs where >10-year shelf life is required. |
| Integrated protection | Auto-recovering thermal shutdown and current limiting prevent damage during overload or poor heatsinking conditions. |
| Low-noise output | 150 µVrms (10 Hz–100 kHz) supports noise-sensitive analog circuits like ADC references or RF synthesizer supplies. |
Applications
| Server Core Voltage Regulation | DSP Power Supply |
|---|---|
|
Use Scenario: Local 1.8V supply for FPGA I/O banks or ASIC core logic in rack-mounted servers with tight thermal budgets. IC Role / Device Role / Timing Role: Post-regulator after intermediate 3.3V or 5V DC/DC converter; provides low-noise, fast-transient response for dynamic load changes. Use Value: 75 mV dropout enables efficient conversion from 2.5V intermediate bus, reducing power loss by 320 mW vs. 300 mV-drop alternatives at 0.8A. |
Use Scenario: Dedicated 1.8V rail for TI C6000 or Analog Devices SHARC DSP cores requiring sub-200 µVrms supply noise. IC Role / Device Role / Timing Role: Primary core regulator; supplies digital logic and memory interface; responds to 500 mA step load in <10 µs. Use Value: 150 µVrms output noise meets DSP ADC reference SNR requirements without additional filtering stages. |
| SMPS Post-Regulator | Microcontroller I/O Supply |
|
Use Scenario: Final-stage regulation after buck converter in industrial PLC modules where EMI compliance restricts switching frequency. IC Role / Device Role / Timing Role: Low-EMI linear post-regulator; eliminates switching ripple from 500 kHz–2 MHz SMPS outputs. Use Value: 80 dB PSRR at 120 Hz suppresses residual AC line ripple; 65 dB at 1 kHz attenuates high-frequency switching artifacts. |
Use Scenario: Powering 1.8V GPIO, UART, and SPI peripherals in ARM Cortex-M4/M7 MCUs operating across −40°C to +85°C. IC Role / Device Role / Timing Role: Local point-of-load regulator; handles pulsed I/O loads up to 0.6A with <1% output deviation. Use Value: −40°C to +125°C junction rating ensures reliability in unventilated enclosures; 0.04%/A load regulation prevents I/O timing skew. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A4701RGWR | 1.8V fixed, 1A, 35 µVrms noise, no VBIAS requirement, 200 mV dropout @ 1A | Lower noise and higher current, but higher dropout limits use with <2.0V inputs; simpler single-rail design | Select when lowest noise is critical and input voltage ≥2.0V; avoid if VIN < 2.0V or board space prohibits larger 20-pin QFN. |
| MCP1826T-1802E/DB | 1.8V fixed, 1A, 250 mV dropout @ 1A, integrated enable pull-up, SO-8 package | No VBIAS rail needed; higher dropout increases power loss; lacks thermal shutdown flag or current limit reporting | Select for cost-sensitive, space-constrained designs where VBIAS complexity is unacceptable and thermal margin >20°C exists. |
Compared with LP3881ESX-1.8/NOPB, TPS7A4701RGWR offers superior noise performance and higher current but requires ≥2.0V input and occupies more PCB area; MCP1826T-1802E/DB simplifies BOM with no VBIAS rail yet sacrifices dropout efficiency and protection granularity.
Availability
LP3881ESX-1.8/NOPB is available at Aetrix Electronics and suitable for server core voltage regulation, DSP power supplies, and SMPS post-regulation requiring stable component supply, long-lifecycle assurance, and RoHS-exempt material compliance for industrial deployments.
Supply support for LP3881ESX-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 leader specializing in analog, embedded processing, and power management ICs, with decades of expertise in high-reliability linear regulators and precision power solutions.
The LP3881 product line was engineered for high-current, ultra-low-dropout applications demanding fast transient response and bias-rail flexibility-targeting DSP, microcontroller, and server power architectures where efficiency and noise coexist as non-negotiable constraints.
FAQ
What is the minimum input voltage required for LP3881ESX-1.8/NOPB to maintain regulation?
The LP3881ESX-1.8/NOPB requires VIN ≥ VOUT + VDO = 1.8V + 75 mV = 1.875V (typical) at 0.8A load. At −40°C, dropout rises to ~120 mV, so VIN ≥ 1.92V is recommended for guaranteed operation across temperature. Input must also satisfy VBIAS ≥ 4.5V from a separate rail.
Can LP3881ESX-1.8/NOPB operate without an external VBIAS supply?
No. LP3881ESX-1.8/NOPB requires a dedicated 4.5–6V VBIAS rail to drive its N-MOS pass transistor gate. Omitting VBIAS prevents regulation entirely-even with sufficient VIN-and triggers undervoltage lockout. No internal charge pump or bootstrap circuitry is provided.
Why does LP3881ESX-1.8/NOPB specify tantalum capacitors instead of ceramic for output filtering?
LP3881ESX-1.8/NOPB's control loop requires 0.001–1 Ω ESR for stability. Ceramic capacitors typically have ESR < 10 mΩ, causing phase-margin loss and oscillation. Tantalum caps provide stable, temperature-invariant ESR in this range-aluminum electrolytics are discouraged due to cold-temperature ESR rise.
What thermal derating applies to LP3881ESX-1.8/NOPB in TO-263 package?
In TO-263 (KTT) with ≥1.5 in² copper plane, LP3881ESX-1.8/NOPB has θJA ≈ 40°C/W. At 25°C ambient, max continuous power is (125°C − 25°C)/40°C/W = 2.5W. With 1.8V output and 0.8A load, power dissipation is (VIN − 1.8V) × 0.8A + 3 mA × VIN; thermal shutdown activates if junction exceeds 150°C.
Is LP3881ESX-1.8/NOPB pin-compatible with other LP3881 variants like LP3881ES-1.8/NOPB?
Yes. LP3881ESX-1.8/NOPB and LP3881ES-1.8/NOPB share identical TO-263 (KTT) 5-pin pinout, electrical specifications, and thermal characteristics. The "X" suffix denotes tape-and-reel packaging (500 pcs/reel), while "ES" indicates tube packaging (45 pcs/tube); both are functionally and mechanically interchangeable.
LP3881ESX-1.8/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):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.16V @ 800mA
- Current - Output:
- 800mA
- Current - Quiescent (Iq):
- 30 µA
- Current - Supply (Max):
- 8 mA
- PSRR:
- 80dB ~ 65dB (120Hz ~ 1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Short Circuit, Under Voltage Lockout (UVLO)
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-5)
LP3881ESX-1.8/NOPB FAQ
1.How can I place an order for LP3881ESX-1.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3881ESX-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 LP3881ESX-1.8/NOPB reliable?
The price and inventory of LP3881ESX-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 LP3881ESX-1.8/NOPB is usually 5 days.
3.What payment methods are accepted for LP3881ESX-1.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3881ESX-1.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3881ESX-1.8/NOPB?
LP3881ESX-1.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3881ESX-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 LP3881ESX-1.8/NOPB?
For technical support, including LP3881ESX-1.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3881ESX-1.8/NOPB requirements.
6.How does Aetrix verify that LP3881ESX-1.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3881ESX-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 LP3881ESX-1.8/NOPB meets industry standards.
7.What is the process for return or replacement of LP3881ESX-1.8/NOPB?
All LP3881ESX-1.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3881ESX-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 LP3881ESX-1.8/NOPB part is unused and in its original packaging.
Return procedure for LP3881ESX-1.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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