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Texas Instruments LP3961EMP-2.5/NOPB
- Part No.:
- LP3961EMP-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-261-5, TO-261AB
- Datasheet:
-
LP3961EMP-2.5/NOPB.pdf
- Description:
- IC REG LIN 2.5V 800MA SOT223-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,720
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Product details
Overview
LP3961EMP-2.5/NOPB from Texas Instruments is a fixed-output 2.5 V, 800-mA ultra-low-dropout linear regulator in SOT-223 package, featuring 24 mV dropout at 80 mA, ±1.5% output voltage accuracy, and integrated ERROR flag for output monitoring-designed for microprocessor core supplies and low-voltage bus terminators.
For engineers reviewing the LP3961EMP-2.5/NOPB datasheet, LP3961EMP-2.5/NOPB pinout, LP3961EMP-2.5/NOPB application, or LP3961EMP-2.5/NOPB equivalent, key selection criteria include dropout performance under 800-mA load, ERROR flag response threshold (10% VOUT drop), shutdown quiescent current (15 µA), and compatibility with 33-µF minimum output capacitance using tantalum or low-ESR electrolytic types.
Technical Context
The LP3961EMP-2.5/NOPB uses a PMOS pass element with 240 mΩ typical RDS(on), enabling ultra-low dropout operation down to 24 mV at light load and 240 mV at full 800-mA load. Its ERROR flag is an open-drain comparator with 10% nominal output voltage threshold and 5% hysteresis, active only when SD = high.
It operates from 2.5 V to 7 V input, supports −40°C to 125°C junction temperature, and delivers ±0.02% load regulation across 10–800 mA. Ground pin current remains stable at 4 mA (typ) at full load, independent of output current due to CMOS bias architecture.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5 V ±1.5% at 25°C; ±3% over −40°C to 125°C - ensures stable core rail for low-voltage logic |
| Max Output Current | 800 mA DC - sufficient for single-core microprocessors or multiple GTL/SSTL terminators |
| Dropout Voltage | 24 mV at 80 mA; 240 mV at 800 mA - enables operation with minimal VIN–VOUT margin, e.g., 2.53 V input for 2.5 V output |
| Quiescent Current | 15 µA in shutdown mode - critical for battery-backed systems requiring ultra-low standby drain |
| ERROR Flag Threshold | 10% below nominal VOUT (2.25 V) with 5% hysteresis - provides reliable undervoltage detection without chatter during transient recovery |
| Load Regulation | 0.02% (10–800 mA) - maintains tight voltage stability across dynamic CPU load changes |
| Input Voltage Range | 2.5 V to 7 V - compatible with Li-ion, 3.3 V/5 V rails, and post-regulation from switching converters |
Pinout & Package
SOT-223 (5-pin) package: 6.50 mm × 3.56 mm body, thermally enhanced with exposed pad (pin 5 = GND). Designed for surface-mount assembly and moderate power dissipation with PCB copper pour.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SD | Shutdown control input | CMOS-compatible active-low enable; requires 10-kΩ pullup to IN if unused; forces ERROR invalid during shutdown |
| 2 - IN | Input supply connection | Accepts 2.5–7 V; must be decoupled with ≥68 µF low-ESR capacitor within 1 cm for stability |
| 3 - OUT | Regulated output | Delivers fixed 2.5 V; connects directly to load or remote sense point (not used on LP3961) |
| 4 - ERROR | Open-drain fault indicator | Asserts low when VOUT falls ≤10% below 2.5 V; requires external pullup; sinks up to 1 mA |
| 5 - GND | Power ground reference | Common return for IN, OUT, SD, and ERROR; electrically tied to thermal pad for heat dissipation |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 24 mV @ 80 mA enables use with sub-3 V inputs - essential for battery-powered 2.5 V logic rails |
| Integrated ERROR flag | Dedicated open-drain output with 10% VOUT threshold - eliminates need for external supervisor IC in space-constrained designs |
| Stable with low-ESR caps | Validated for 33 µF output capacitance with 0.2–5 Ω ESR - supports cost-effective tantalum instead of expensive ceramics |
| Thermal & short-circuit protection | 165°C shutdown with 10°C hysteresis and cycle-limiting current foldback - prevents damage during sustained overload |
| Low ground current | 4 mA at 800 mA load, independent of output current - improves efficiency vs. bipolar LDOs and simplifies thermal modeling |
Applications
| Microprocessor Core Supply | GTL/SSTL Bus Termination |
|---|---|
|
Use Scenario: Powering 2.5 V I/O domains of ARM Cortex-M or legacy x86 embedded processors with bursty current demand. IC Role / Device Role / Timing Role: Primary low-noise, fast-transient LDO delivering clean 2.5 V rail; ERROR flag monitors rail integrity during clock gating or sleep transitions. Use Value: 240 mV dropout allows direct regulation from 2.75 V intermediate rail, minimizing heat; 0.02% load regulation prevents timing margin loss during 0→800 mA load steps. |
Use Scenario: Providing precision 2.5 V termination voltage for GTL+, SSTL_2, or BTL signaling on high-speed memory or FPGA interfaces. IC Role / Device Role / Timing Role: Stable, low-noise voltage reference source; low output impedance (<10 mΩ effective) maintains signal integrity across parallel terminators. Use Value: ±1.5% initial accuracy and 0.02% load regulation ensure consistent VTT compliance; 150 µVRMS noise avoids jitter-induced bit errors. |
| Post-Regulator for Switching Supplies | Battery-Powered Instrumentation |
|
Use Scenario: Cleaning ripple from 3.3 V buck converter output to feed sensitive analog front-ends or ADC references. IC Role / Device Role / Timing Role: Low-PSRR post-filter stage; ERROR flag signals upstream converter failure or input brownout before system reset. Use Value: 60 dB PSRR at 120 Hz suppresses fundamental switching noise; 24 mV dropout preserves headroom when buck output sags under load. |
Use Scenario: Long-life portable test equipment powered by two-cell Li-ion (6.4–8.4 V), requiring regulated 2.5 V for sensor bias and MCU core. IC Role / Device Role / Timing Role: Main system LDO with shutdown control; ERROR flag triggers low-battery warning before cutoff. Use Value: 15 µA shutdown current extends shelf life; 2.5 V output matches common op-amp and ADC reference requirements without scaling resistors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-dropout linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TSS721AIDR | 2.5 V fixed, 500-mA rating, 120 mV dropout at 500 mA, no ERROR flag, SOIC-8 package | Lacks fault reporting; lower current capacity limits use in multi-terminator or high-dynamic-load scenarios | Choose when ERROR monitoring is unnecessary and board space permits SOIC-8; verify thermal derating at 800 mA |
| TPS7A2025PDQNR | 2.5 V fixed, 300-mA rating, 130 mV dropout at 300 mA, 6.5 µA IQ, WSON-6 package | Lower max current and no ERROR output; optimized for ultra-low IQ, not high-current stability | Select for battery-powered IoT nodes where 300 mA suffices and 6.5 µA IQ outweighs need for fault detection |
Compared with TSS721AIDR and TPS7A2025PDQNR, the LP3961EMP-2.5/NOPB uniquely combines 800-mA capability, 24 mV dropout, and integrated ERROR flag in SOT-223 - making it the only option among the three suitable for 2.5 V microprocessor core supplies requiring both high current and rail monitoring.
Availability
LP3961EMP-2.5/NOPB is available at Aetrix Electronics and suitable for microprocessor core supplies, GTL/SSTL bus terminators, post-regulators, battery-powered instrumentation, and industrial embedded controllers requiring stable component supply with long-term lifecycle support.
Supply support for LP3961EMP-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 technologies, with decades of LDO design heritage and automotive-grade reliability validation.
The LP396x series was developed for high-efficiency, low-noise linear regulation in space- and power-constrained systems - targeting microprocessor I/O, memory interface termination, and precision analog subsystems where dropout, accuracy, and fault awareness are critical.
FAQ
What is the minimum input voltage required for LP3961EMP-2.5/NOPB to regulate 2.5 V output?
The LP3961EMP-2.5/NOPB requires a minimum input voltage of 2.5 V + dropout voltage. At 800 mA, dropout is 240 mV (typ), so VIN must be ≥2.74 V to maintain regulation. The datasheet specifies 2.5 V as absolute minimum input, but operation below VOUT + 240 mV risks output droop under full load.
Does LP3961EMP-2.5/NOPB require an external pullup resistor on the ERROR pin?
Yes - the ERROR pin is open-drain and must be pulled high with a resistor (typically 10 kΩ to IN) to generate a valid logic-high when the output is in regulation. If the ERROR function is unused, the pin must be connected directly to GND per TI's design guidance to prevent floating node issues.
Can LP3961EMP-2.5/NOPB operate with ceramic output capacitors?
No - the LP3961EMP-2.5/NOPB requires output capacitor ESR between 0.2 Ω and 5 Ω for loop stability. Standard ceramic capacitors have ESR <10 mΩ and will cause oscillation. Tantalum or low-ESR aluminum electrolytic capacitors meeting the 33 µF minimum and ESR range are mandatory.
What happens to the ERROR flag during shutdown of LP3961EMP-2.5/NOPB?
When the SD pin is pulled low, the LP3961EMP-2.5/NOPB enters shutdown mode and the ERROR flag is forced invalid - its state becomes undefined and should not be monitored. The ERROR function is only active when SD is high and the regulator is enabled.
Is LP3961EMP-2.5/NOPB RoHS-compliant and lead-free?
Yes - the /NOPB suffix explicitly denotes "No Lead (Pb)-Free" per TI's part numbering convention. LP3961EMP-2.5/NOPB meets RoHS Directive 2011/65/EU and is manufactured with lead-free terminations and halogen-free molding compounds.
LP3961EMP-2.5/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):
- 2.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.35V @ 800mA
- Current - Output:
- 800mA
- Current - Quiescent (Iq):
- 9 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:
- SOT-223-5
LP3961EMP-2.5/NOPB FAQ
1.How can I place an order for LP3961EMP-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3961EMP-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 LP3961EMP-2.5/NOPB reliable?
The price and inventory of LP3961EMP-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 LP3961EMP-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LP3961EMP-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3961EMP-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3961EMP-2.5/NOPB?
LP3961EMP-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3961EMP-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 LP3961EMP-2.5/NOPB?
For technical support, including LP3961EMP-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3961EMP-2.5/NOPB requirements.
6.How does Aetrix verify that LP3961EMP-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3961EMP-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 LP3961EMP-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LP3961EMP-2.5/NOPB?
All LP3961EMP-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3961EMP-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 LP3961EMP-2.5/NOPB part is unused and in its original packaging.
Return procedure for LP3961EMP-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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