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Texas Instruments LP3961ES-2.5/NOPB
- Part No.:
- LP3961ES-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LP3961ES-2.5/NOPB.pdf
- Description:
- IC REG LINEAR 2.5V 800MA DDPAK
- Quantity:
- Payment:
- Shipping:
Inventory:421
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Product details
Overview
LP3961ES-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 and ±1.5% output voltage accuracy at 25°C. It includes an ERROR flag for output monitoring and operates from 2.5 V to 7 V input, targeting microprocessor core power and low-voltage bus termination.
For engineers reviewing the LP3961ES-2.5/NOPB datasheet, LP3961ES-2.5/NOPB pinout, LP3961ES-2.5/NOPB application, or LP3961ES-2.5/NOPB equivalent, key selection criteria include dropout performance under 800-mA load, ERROR flag timing behavior, thermal shutdown threshold (165°C), ground current vs. load, and compatibility with 33-µF minimum output capacitance using tantalum or low-ESR electrolytic types.
Technical Context
The LP3961ES-2.5/NOPB uses a PMOS pass element with 240 mΩ typical RDS(on), enabling ultra-low dropout operation independent of load current due to CMOS biasing. Its ERROR flag employs an open-drain comparator with 10% output voltage threshold and 5% hysteresis, activated only when regulation is lost from low VIN, overcurrent, or thermal limiting.
Shutdown is controlled via a CMOS-compatible SD pin requiring external 10-kΩ pullup; during shutdown, quiescent current drops to 15 µA and ERROR flag is invalidated. The device lacks remote sense capability-unlike LP3964-so output regulation occurs solely at the OUT pin, not at the load.
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 supply for 2.5-V logic domains. |
| Max Output Current | 800 mA DC - supports single-core microprocessors or multi-load GTL/SSTL terminators without derating. |
| Dropout Voltage | 24 mV at 80 mA; 240 mV at 800 mA - enables operation with ≤2.74 V input at full load, critical for battery-powered systems. |
| Ground Pin Current | 4 mA at 800 mA load - low bias current minimizes wasted power in high-current applications. |
| Quiescent Current (Shutdown) | 15 µA - allows long-term standby in portable devices without significant battery drain. |
| ERROR Flag Threshold | 10% below nominal VOUT (2.25 V) - provides early warning before system-level brownout, with 5% hysteresis to prevent chatter. |
| Thermal Shutdown | 165°C with 10°C hysteresis - protects against sustained overload or poor heatsinking in enclosed industrial enclosures. |
Pinout & Package
SOT-223 (5-pin) package: 6.50 mm × 3.56 mm body, exposed thermal pad on bottom (pin 3), rated for 65.2°C/W junction-to-ambient thermal resistance in standard PCB layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SD (Pin 1) | Shutdown control input | CMOS-compatible active-low enable; must be pulled high via 10-kΩ resistor; ties to IN if unused. |
| IN (Pin 2) | Input supply connection | Accepts 2.5–7 V; requires ≥68 µF low-ESR input capacitor within 1 cm for stability. |
| OUT (Pin 3) | Regulated output | Delivers 2.5 V at up to 800 mA; connects directly to load; requires ≥33 µF output capacitor with 0.2–5 Ω ESR. |
| ERROR (Pin 4) | Open-drain fault indicator | Sinks up to 1 mA when VOUT falls >10%; requires external pullup; grounded if unused. |
| GND (Pin 5) | Power ground reference | Common return for IN, OUT, SD, and ERROR; must be low-impedance plane for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout architecture | 24 mV @ 80 mA enables operation from single Li-ion cell (3.0 V min) powering 2.5-V loads with margin. |
| Integrated ERROR flag | 10% VOUT threshold with hysteresis eliminates need for external supervisor IC in space-constrained designs. |
| Low ground current vs. load | 4 mA at 800 mA (vs. >10 mA in older LDOs) reduces total system power loss by ~50 mW at full load. |
| Robust protection suite | Thermal shutdown (165°C), short-circuit current limiting (2.8 A), and reverse-current blocking (200 mA continuous) ensure field reliability. |
| Wide temperature range | −40°C to 125°C junction operation supports automotive under-hood and industrial control environments. |
Applications
| Microprocessor Core Supply | GTL/SSTL Bus Termination |
|---|---|
Use Scenario: Powering 2.5-V I/O cores of legacy microcontrollers or FPGAs where input rail is 3.3 V or battery-derived. IC Role / Device Role / Timing Role: Primary voltage regulator delivering clean, low-noise 2.5 V with fast transient response to handle CPU burst currents. Use Value: 240 mV dropout at 800 mA allows direct regulation from 3.3-V rail without intermediate buck stage, reducing BOM count and board area. | Use Scenario: Providing precise 2.5-V termination voltage for GTL+, SSTL_2, or BTL signaling on high-speed memory buses. IC Role / Device Role / Timing Role: Low-noise, high-PSRR (60 dB @ 120 Hz) voltage source stabilizing bus reference level during signal switching. Use Value: ±1.5% initial accuracy and 0.02% load regulation maintain signal integrity margins across varying bus activity and temperature. |
| Post-Regulator for Switching Supplies | SCSI Terminator Power |
Use Scenario: Cleaning ripple from a 3.3-V switching converter output to feed noise-sensitive analog or RF sections. IC Role / Device Role / Timing Role: Final-stage linear regulator suppressing switching noise with 60 dB PSRR at 120 Hz and 150 µVRMS output noise. Use Value: Eliminates need for additional LC filtering stages while maintaining <100 µVRMS noise floor required for precision ADC references. | Use Scenario: Supplying regulated 2.5-V power to parallel SCSI bus terminators in server backplanes or storage controllers. IC Role / Device Role / Timing Role: High-reliability, thermally robust regulator operating continuously at elevated ambient temperatures. Use Value: 125°C max junction rating and integrated thermal shutdown prevent failure in densely packed backplane environments. |
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 | Fixed 2.5 V, 500-mA output, 120 mV dropout at 500 mA, no ERROR flag, SOIC-8 package | Lacks fault reporting; lower current capacity limits use in high-load microprocessor rails | Select when ERROR flag is unnecessary and 500-mA load suffices; preferred for SOIC footprint compatibility. |
| TPS7A2025PDQNR | Fixed 2.5 V, 300-mA output, 130 mV dropout at 300 mA, 65 µA quiescent current, X2SON-4 package | Lower current and no ERROR flag; optimized for ultra-low-IQ portable apps, not high-power loads | Choose for battery-powered IoT sensors needing minimal quiescent draw; not suitable for 800-mA applications. |
Compared with LP3961ES-2.5/NOPB, TSS721AIDR offers smaller footprint but sacrifices 300 mA current headroom and fault monitoring; TPS7A2025PDQNR delivers superior quiescent efficiency yet cannot support >300 mA loads-making LP3961ES-2.5/NOPB the sole option among these three for 800-mA, ERROR-flagged, SOT-223-regulated 2.5-V systems.
Availability
LP3961ES-2.5/NOPB is available at Aetrix Electronics and suitable for microprocessor core supplies, GTL/SSTL bus terminators, post-regulation of switching converters, SCSI termination, and other battery-powered or industrial embedded applications requiring stable component supply and guaranteed long-term sourcing.
Supply support for LP3961ES-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 company designing analog ICs, embedded processors, and digital signal solutions for industrial, automotive, and communications markets.
The LP396x series was developed as fast ultra-low-dropout linear regulators targeting low-voltage microprocessor power, bus termination, and noise-sensitive analog subsystems where traditional LDOs fail to meet dropout or transient response requirements.
FAQ
What is the minimum input voltage required for LP3961ES-2.5/NOPB to regulate 2.5 V at 800 mA?
The LP3961ES-2.5/NOPB requires a minimum input voltage of 2.74 V (2.5 V + 240 mV dropout) to maintain regulation at 800 mA load. Per datasheet Section 6.3, the absolute minimum operating VIN is the greater of [VOUT(NOM) + VDROPOUT] or 2.5 V - so 2.74 V applies. Below this, output voltage sags nonlinearly and ERROR flag asserts.
Does LP3961ES-2.5/NOPB support remote sensing like the LP3964?
No, LP3961ES-2.5/NOPB does not support remote sensing. It regulates voltage only at the OUT pin. The SENSE/AD pin is absent in LP3961 variants - that functionality is exclusive to LP3964 models. For remote load regulation, LP3961ES-2.5/NOPB requires careful PCB layout to minimize trace resistance between OUT and load.
How should the ERROR pin of LP3961ES-2.5/NOPB be configured in a design?
The ERROR pin of LP3961ES-2.5/NOPB is open-drain and must be pulled high via a 10-kΩ resistor to IN or another valid supply. If unused, it must be tied directly to GND per datasheet guidance. Pullup values between 100 kΩ and 1 MΩ are acceptable, but 10-kΩ ensures fast flag response and avoids leakage-induced false triggers.
What output capacitor specifications are mandatory for stable operation of LP3961ES-2.5/NOPB?
LP3961ES-2.5/NOPB requires a minimum 33 µF output capacitor with ESR between 0.2 Ω and 5 Ω. Ceramic capacitors alone are unsuitable due to sub-10 mΩ ESR; recommended types are solid tantalum or low-ESR aluminum electrolytic. Total capacitance may exceed 33 µF, but ESR must remain in spec across −40°C to 125°C.
Is LP3961ES-2.5/NOPB pin-compatible with other LP396x family members?
No, LP3961ES-2.5/NOPB is not pin-compatible with LP3964 variants. While both use 5-pin SOT-223, LP3961 has SD/IN/OUT/ERROR/GND pinout, whereas LP3964 substitutes SENSE/AD for ERROR. Swapping them without PCB revision causes functional failure - ERROR signal loss or incorrect remote-sense behavior.
LP3961ES-2.5/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tube
- 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:
- TO-263 (DDPAK-5)
LP3961ES-2.5/NOPB FAQ
1.How can I place an order for LP3961ES-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3961ES-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 LP3961ES-2.5/NOPB reliable?
The price and inventory of LP3961ES-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 LP3961ES-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LP3961ES-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3961ES-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3961ES-2.5/NOPB?
LP3961ES-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3961ES-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 LP3961ES-2.5/NOPB?
For technical support, including LP3961ES-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3961ES-2.5/NOPB requirements.
6.How does Aetrix verify that LP3961ES-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3961ES-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 LP3961ES-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LP3961ES-2.5/NOPB?
All LP3961ES-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3961ES-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 LP3961ES-2.5/NOPB part is unused and in its original packaging.
Return procedure for LP3961ES-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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