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Texas Instruments LP3965EMP-2.5/NOPB
- Part No.:
- LP3965EMP-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-261-5, TO-261AB
- Datasheet:
-
LP3965EMP-2.5/NOPB.pdf
- Description:
- IC REG LINEAR 2.5V 1.5A SOT223-5
- Quantity:
- Payment:
- Shipping:
Inventory:848
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Product details
Overview
LP3965EMP-2.5/NOPB from Texas Instruments is a 2.5V fixed-output, 1.5A ultra-low-dropout linear regulator in SOT-223-5 package, featuring 380mV dropout at full load, ±1.5% output voltage accuracy, and remote sense capability for improved load regulation. It operates from 2.5V to 7.0V input and delivers stable power to microprocessor cores and bus terminators.
For engineers reviewing the LP3965EMP-2.5/NOPB datasheet, LP3965EMP-2.5/NOPB pinout, LP3965EMP-2.5/NOPB application, or LP3965EMP-2.5/NOPB equivalent, key selection criteria include dropout performance under 1.5A load, SENSE pin functionality for remote regulation, thermal shutdown behavior at 165°C, and compatibility with low-ESR tantalum output capacitors (0.2–5Ω).
Technical Context
The LP3965EMP-2.5/NOPB uses a CMOS-based PMOS pass element with 240mΩ typical RDS(on), enabling ultra-low dropout and quiescent current independence from load. Its internal error amplifier compares either VOUT (LP3962) or remote SENSE voltage (LP3965) against a precision 1.216V reference.
It integrates overtemperature shutdown (165°C trigger, 10°C hysteresis), short-circuit protection (4.5A limit), and a dedicated open-drain ERROR flag that asserts low when output drops >10% below nominal. Shutdown mode draws only 15µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V ±1.5% at 25°C; ±3.0% over −40°C to +125°C junction range. |
| Max Output Current | 1.5A DC continuous; peak current up to 2.5A with thermal derating. |
| Dropout Voltage | 380mV at 1.5A load; enables operation with VIN as low as 2.88V while maintaining regulation. |
| Ground Pin Current | 5mA at 1.5A load; enables accurate power budgeting in high-current systems. |
| Quiescent Current | 15µA in shutdown; reduces system standby power in battery-backed applications. |
| PSRR | 60dB at 120Hz (VIN = VOUT+1.5V); suppresses ripple from upstream switching supplies. |
| Output Noise | 150µVrms (10Hz–100kHz); suitable for noise-sensitive analog and RF circuitry. |
Pinout & Package
SOT-223-5 plastic surface-mount package with exposed thermal pad (pin 3 is VOUT, pin 5 is GND, pin 4 is SENSE/ADJ - not ERROR). Thermal resistance θJA = 90°C/W with 0.5in² 1oz copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | SD (Shutdown) | CMOS-compatible active-low enable; requires 10kΩ pull-up for default ON operation. |
| 2 | VIN | Main input supply (2.5V–7.0V); connects to input capacitor within 1cm for stability. |
| 3 | VOUT | Regulated 2.5V output; Kelvin-connected to output capacitor for low-noise delivery. |
| 4 | SENSE/ADJ | Remote sense input (LP3965) - connect directly to load point to compensate for PCB trace IR drop. |
| 5 | GND | Power ground; must be single-point connected to input/output capacitor grounds to avoid instability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 380mV @ 1.5A enables use with tight VIN–VOUT margins (e.g., Li-ion battery post-regulation). |
| Remote sense capability | SENSE pin allows regulation at load point, eliminating up to 150mV error from 100mΩ PCB traces at 1.5A. |
| Integrated ERROR flag | Open-drain output signals fault conditions (dropout, overcurrent, thermal shutdown) without external logic. |
| Stable with low-ESR caps | Validated for 33µF tantalum output capacitor with 0.2–5Ω ESR - avoids ceramic instability issues. |
| Thermal protection | 165°C shutdown with 10°C hysteresis prevents permanent damage during sustained overload or poor heatsinking. |
Applications
| Microprocessor Core Supply | GTL/GTL+ Bus Termination |
|---|---|
|
Use Scenario: Powers 2.5V I/O domains of FPGA or ASIC with fast load transients. IC Role / Device Role / Timing Role: Primary LDO delivering clean, low-noise 2.5V to core logic and interface banks. Use Value: 25µs turn-on delay and 60dB PSRR ensure stable voltage during clock domain transitions and reduce jitter. |
Use Scenario: Provides precise 2.5V termination voltage for GTL/GTL+ signaling on backplanes. IC Role / Device Role / Timing Role: Fixed-voltage reference source for parallel bus termination networks. Use Value: ±1.5% initial accuracy and 0.04% load regulation maintain signal integrity across 10–1500mA load range. |
| SCSI Terminator Power | DSP Analog Supply |
|
Use Scenario: Supplies regulated 2.5V to active SCSI terminator arrays in server storage subsystems. IC Role / Device Role / Timing Role: Low-noise local regulator replacing bulk 3.3V rail for termination bias. Use Value: 150µVrms broadband noise prevents false triggering in differential receivers. |
Use Scenario: Powers analog sections (ADC reference, PGA, codec) of low-power DSPs. IC Role / Device Role / Timing Role: Post-regulator cleaning switching supply ripple before sensitive analog paths. Use Value: 60dB PSRR at 120Hz attenuates SMPS ripple; SENSE pin ensures stable voltage at ADC VREF pin. |
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 |
|---|---|---|---|
| TPS7A4700RGWR | 20V max input, 1A output, 4µVrms noise, no SENSE pin, adjustable only. | Lacks remote sense; better for high-PSRR, low-noise analog rails where input >7V is needed. | Select when ultra-low noise (<5µV) and wide VIN are priorities over 1.5A current and SENSE capability. |
| MCP1826T-2502E/DB | 2.5V fixed, 1.5A, SOT-223, no SENSE or ERROR flag, 600mV dropout @1.5A. | No fault reporting or remote sensing; simpler design but higher dropout limits low-VIN use cases. | Select for cost-sensitive, non-critical applications where 380mV vs. 600mV dropout margin is acceptable. |
Compared with LP3965EMP-2.5/NOPB, TPS7A4700RGWR offers superior noise performance but lacks SENSE and has lower current rating, while MCP1826T-2502E/DB provides identical package and output but sacrifices dropout, fault detection, and remote regulation capability.
Availability
LP3965EMP-2.5/NOPB is available at Aetrix Electronics and suitable for microprocessor core supplies, GTL bus terminators, and SCSI termination circuits requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for LP3965EMP-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 designing analog ICs, embedded processors, and digital signal solutions for industrial, automotive, and communications markets.
The LP3965 belongs to TI's ultra-low-dropout linear regulator product line, engineered specifically for high-current, low-margin power delivery in microprocessor and high-speed digital interface applications.
FAQ
What is the minimum input voltage required for LP3965EMP-2.5/NOPB to regulate at full 1.5A load?
The LP3965EMP-2.5/NOPB requires VIN ≥ VOUT + VDROPOUT = 2.5V + 0.38V = 2.88V to maintain regulation at 1.5A. Below this, output voltage collapses per the 2% dropout definition. The device will not operate below 2.5V input, as specified in operating ratings.
Can the SENSE pin of LP3965EMP-2.5/NOPB be left unconnected or tied to ground?
No - the SENSE pin of LP3965EMP-2.5/NOPB must be connected either to the remote load point (for improved regulation) or directly to the VOUT pin (if remote sensing is unused). Leaving it floating or grounding it violates the internal feedback path and may cause regulation failure or instability.
Does LP3965EMP-2.5/NOPB require an external pull-up resistor on the ERROR pin?
Yes - the ERROR pin is open-drain and must be pulled high via a 10kΩ–1MΩ resistor to VIN or another logic supply. If unused, TI specifies connecting ERROR directly to GND. Failure to pull up disables fault reporting and may leave downstream logic undriven.
What output capacitor ESR range ensures stability for LP3965EMP-2.5/NOPB?
LP3965EMP-2.5/NOPB requires an output capacitor with ESR between 0.2Ω and 5Ω for loop stability. Ceramic capacitors alone are unsuitable due to sub-10mΩ ESR; 33µF low-ESR tantalum (e.g., AVX TAJ series) is validated and recommended.
Is LP3965EMP-2.5/NOPB pin-compatible with LP3962EMP-2.5/NOPB?
No - LP3965EMP-2.5/NOPB and LP3962EMP-2.5/NOPB share the same SOT-223-5 package and pin 1–3 assignments (SD, VIN, VOUT), but pin 4 is SENSE/ADJ on LP3965 versus ERROR on LP3962. Swapping them without board revision causes functional failure.
LP3965EMP-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):
- 0.55V @ 1.5A
- Current - Output:
- 1.5A
- 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
LP3965EMP-2.5/NOPB FAQ
1.How can I place an order for LP3965EMP-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3965EMP-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 LP3965EMP-2.5/NOPB reliable?
The price and inventory of LP3965EMP-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 LP3965EMP-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LP3965EMP-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3965EMP-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3965EMP-2.5/NOPB?
LP3965EMP-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3965EMP-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 LP3965EMP-2.5/NOPB?
For technical support, including LP3965EMP-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3965EMP-2.5/NOPB requirements.
6.How does Aetrix verify that LP3965EMP-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3965EMP-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 LP3965EMP-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LP3965EMP-2.5/NOPB?
All LP3965EMP-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3965EMP-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 LP3965EMP-2.5/NOPB part is unused and in its original packaging.
Return procedure for LP3965EMP-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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