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Texas Instruments LP3965ESX-3.3/NOPB
- Part No.:
- LP3965ESX-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LP3965ESX-3.3/NOPB.pdf
- Description:
- IC REG LINEAR 3.3V 1.5A DDPAK
- Quantity:
- Payment:
- Shipping:
Inventory:469
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Product details
Overview
LP3965ESX-3.3/NOPB from Texas Instruments is a 3.3V, 1.5A ultra-low-dropout linear regulator in SOT-223-5 package, featuring 38 mV dropout at 150 mA and ±1.5% output voltage accuracy at room temperature. It delivers fast transient response for microprocessor power supplies and includes remote sense capability for improved load regulation at remote points.
For engineers reviewing the LP3965ESX-3.3/NOPB datasheet, LP3965ESX-3.3/NOPB pinout, LP3965ESX-3.3/NOPB application, or LP3965ESX-3.3/NOPB equivalent, key selection criteria include dropout performance under 1.5A load, SENSE pin functionality for PCB trace compensation, thermal shutdown behavior at 165°C, and compatibility with 33 µF/0.2–5 Ω output capacitor ESR range.
Technical Context
The LP3965ESX-3.3/NOPB uses a CMOS-based PMOS pass element with 240 mΩ typical RDS(on), enabling ultra-low dropout and quiescent current independent of load. Its internal error amplifier compares feedback from either VOUT (default) or SENSE pin, allowing precise regulation at the load point when remote sensing is enabled.
It integrates overtemperature protection (165°C shutdown with 10°C hysteresis), short-circuit current limiting (~4.5 A), and a dedicated open-drain ERROR flag that asserts low when output drops >10% below nominal. Shutdown mode draws only 15 µA, controlled via CMOS-compatible SD pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±1.5% at 25°C; ±3.0% over −40°C to +125°C junction range |
| Max Output Current | 1.5 A DC continuous; peak current up to 2.5 A with thermal derating |
| Dropout Voltage | 38 mV at 150 mA; 380 mV at 1.5 A - enables operation with VIN as low as 3.338 V |
| Ground Pin Current | 5 mA at 1.5 A load; 15 µA in shutdown - supports low-power system states |
| Load Regulation | 0.04% - ensures <1.32 mV change in VOUT from 10 mA to 1.5 A load |
| PSRR | 60 dB at 120 Hz (VIN = VOUT + 1.5 V); 40 dB at VIN = VOUT + 0.3 V - suppresses switching noise |
| Output Noise | 150 µVrms (10 Hz–100 kHz); 0.8 µV/√Hz at 120 Hz - suitable for noise-sensitive analog rails |
Pinout & Package
SOT-223-5 surface-mount package with exposed thermal pad (pin 3 is VOUT; pin 4 is SENSE/ADJ; pin 5 is GND). Thermal resistance θJA = 90°C/W with 0.5 in² 1 oz copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | SD | CMOS-compatible shutdown input; must be pulled high via 10 kΩ resistor if not actively driven |
| 2 | VIN | Main input supply (2.5 V to 7.0 V); powers internal bias and pass element |
| 3 | VOUT | Regulated 3.3 V output; connected to SENSE pin if remote sensing is not used |
| 4 | SENSE/ADJ | Remote sense input (LP3965 only); connects directly to load for trace IR-drop compensation |
| 5 | GND | Power ground reference; forms Kelvin return path for VIN/VOUT capacitors |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 38 mV @ 150 mA enables single-cell Li-ion or 3.3 V rail post-regulation from 3.6 V sources |
| Remote sense capability | SENSE pin compensates for up to ~150 mΩ PCB trace resistance, maintaining 3.3 V ±1.5% at load |
| Low-noise operation | 150 µVrms broadband noise supports ADC references and RF power rails without added filtering |
| Integrated protection | Thermal shutdown (165°C), short-circuit limiting (~4.5 A), and ERROR flag reporting ensure robust field operation |
| CMOS process architecture | Enables 15 µA shutdown current and load-independent quiescent current - critical for battery longevity |
Applications
| Microprocessor Core Supply | GTL/GTL+ Bus Termination |
|---|---|
|
Use Scenario: Powering 3.3 V I/O domains of FPGA or ASIC with tight voltage tolerance and fast load transients. IC Role / Device Role / Timing Role: Primary LDO delivering stable 3.3 V to logic interfaces; SENSE pin connected at BGA ball for minimal IR drop. Use Value: 0.04% load regulation and 380 mV dropout at 1.5 A allow direct regulation from 3.6 V battery or buck converter output without intermediate stage. |
Use Scenario: Providing precision termination voltage for GTL/GTL+ signaling buses in server memory subsystems. IC Role / Device Role / Timing Role: Low-noise, low-drift 3.3 V source for bus pull-up networks; operates within ±1.5% accuracy across temperature. Use Value: 150 µVrms noise and 60 dB PSRR prevent signal integrity degradation on high-speed parallel buses. |
| SCSI Terminator Power | DSP Analog Core Supply |
|
Use Scenario: Generating clean 3.3 V for active SCSI-2/3 terminators requiring stable voltage under varying cable loads. IC Role / Device Role / Timing Role: Fixed-output LDO with remote sense ensuring 3.3 V at terminator IC pins despite PCB trace losses. Use Value: SENSE pin eliminates up to 150 mV of trace-induced droop, maintaining SCSI specification compliance across board variants. |
Use Scenario: Supplying low-noise 3.3 V to analog sections of DSPs used in audio processing or sensor fusion. IC Role / Device Role / Timing Role: Post-regulator for noise-sensitive analog cores; bypassed with 33 µF tantalum + local ceramic. Use Value: 0.8 µV/√Hz spot noise density and 150 µVrms broadband noise meet SNR requirements for 16-bit ADC front-ends. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TSS721AIPW | 3.3 V fixed, 1.5 A, but no SENSE pin; higher dropout (120 mV @ 1.5 A); 25 µA IQ | Lacks remote sensing - unsuitable for long-trace or high-current PCB layouts where IR drop exceeds 10 mV | Select when board layout places regulator adjacent to load and cost sensitivity outweighs sensing need |
| TPS7A4701RGWR | Adjustable or 3.3 V option, 1 A max, 25 µVrms noise, 225 mV dropout @ 1 A, integrated soft-start | Lower noise and better PSRR, but lower current rating and no SENSE - limited to sub-1 A analog rails | Prefer for ultra-low-noise analog supplies where 1 A suffices and remote sensing is unnecessary |
Compared with TSS721AIPW and TPS7A4701RGWR, the LP3965ESX-3.3/NOPB uniquely combines 1.5 A delivery, 38 mV dropout, and SENSE functionality - making it the only choice among the three for high-current, long-trace, noise-tolerant 3.3 V regulation where load-point accuracy is critical.
Availability
LP3965ESX-3.3/NOPB is available at Aetrix Electronics and suitable for microprocessor core supplies, GTL bus terminators, SCSI termination circuits, and DSP analog power rails requiring stable component supply with full production traceability.
Supply support for LP3965ESX-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 leader designing analog ICs, embedded processors, and connectivity 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-voltage microprocessor and digital logic power delivery where remote sensing and fast transient response are essential.
FAQ
What is the minimum input voltage required for LP3965ESX-3.3/NOPB to regulate 3.3 V at 1.5 A?
The LP3965ESX-3.3/NOPB requires a minimum input voltage of 3.68 V to maintain regulation at 1.5 A, based on its 380 mV maximum dropout voltage specification. At lighter loads (e.g., 150 mA), VIN as low as 3.338 V suffices. The device will cease regulation if VIN falls below VOUT + VDROPOUT under the given load and temperature conditions.
Can LP3965ESX-3.3/NOPB be used without connecting the SENSE pin?
Yes - LP3965ESX-3.3/NOPB operates as a standard fixed-output LDO when the SENSE pin is tied directly to the VOUT pin. This configuration is mandatory if remote sensing is not needed. Leaving the SENSE pin floating is prohibited and may cause regulation instability or damage.
Does LP3965ESX-3.3/NOPB support reverse current protection?
No - LP3965ESX-3.3/NOPB contains an inherent parasitic body diode between VIN and VOUT. If VOUT exceeds VIN, forward current up to 200 mA DC (1 A peak) flows from output to input. External reverse-blocking circuitry (e.g., series MOSFET) is required for true reverse current isolation.
What output capacitor ESR range ensures stability for LP3965ESX-3.3/NOPB?
LP3965ESX-3.3/NOPB requires an output capacitor with ESR between 0.2 Ω and 5 Ω for guaranteed loop stability. Ceramic capacitors alone are unsuitable due to sub-10 mΩ ESR; a 33 µF solid tantalum (typical ESR ≈ 0.5–2 Ω) is recommended, optionally paralleled with ≤3 µF ceramic for high-frequency bypassing.
How does the ERROR flag behave during shutdown of LP3965ESX-3.3/NOPB?
When the SD pin is pulled low to activate shutdown mode, the ERROR flag on LP3965ESX-3.3/NOPB is forced invalid and electrically disconnected - it neither asserts nor reflects output status. The flag resumes normal operation only after SD returns high and the regulator completes turn-on delay (~25 µs).
LP3965ESX-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):
- 0.55V @ 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:
- TO-263 (DDPAK-5)
LP3965ESX-3.3/NOPB FAQ
1.How can I place an order for LP3965ESX-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3965ESX-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 LP3965ESX-3.3/NOPB reliable?
The price and inventory of LP3965ESX-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 LP3965ESX-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LP3965ESX-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3965ESX-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3965ESX-3.3/NOPB?
LP3965ESX-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3965ESX-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 LP3965ESX-3.3/NOPB?
For technical support, including LP3965ESX-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3965ESX-3.3/NOPB requirements.
6.How does Aetrix verify that LP3965ESX-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3965ESX-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 LP3965ESX-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LP3965ESX-3.3/NOPB?
All LP3965ESX-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3965ESX-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 LP3965ESX-3.3/NOPB part is unused and in its original packaging.
Return procedure for LP3965ESX-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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