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Texas Instruments LP3965ET-1.8/NOPB
- Part No.:
- LP3965ET-1.8/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
LP3965ET-1.8/NOPB.pdf
- Description:
- IC REG LINEAR 1.8V 1.5A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:148
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Product details
Overview
LP3965ET-1.8/NOPB from Texas Instruments is a 1.5A ultra-low-dropout linear regulator with fixed 1.8V output, designed for microprocessor core and I/O power delivery in space-constrained applications. It operates from 2.5V to 7.0V input, delivers ±1.5% output accuracy at room temperature, achieves 38mV dropout at 150mA, and features remote sense capability for improved load regulation.
For engineers reviewing the LP3965ET-1.8/NOPB datasheet, LP3965ET-1.8/NOPB pinout, LP3965ET-1.8/NOPB application, or LP3965ET-1.8/NOPB equivalent, this page provides verified technical context, real-world design meaning of key specs, SOT-223-5 package details, application-specific implementation guidance, and validated alternative options for voltage-regulated power delivery in low-voltage embedded systems.
Technical Context
The LP3965ET-1.8/NOPB uses a CMOS-based PMOS pass element with 240mΩ typical RDS(on), enabling ultra-low dropout operation independent of load current. Its internal error amplifier compares the regulated output (or remote sense point) against a precision bandgap reference, delivering fast transient response to step-load changes up to 1.5A DC.
It integrates shutdown control with 15µA quiescent current, overtemperature and overcurrent protection, and an open-drain ERROR flag that asserts low when VOUT drops >10% below nominal - all while supporting remote sensing via the SENSE/ADJ pin to compensate for PCB trace IR drop at the load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±1.5% at 25°C; ensures stable core voltage for 1.8V logic families without external feedback components. |
| Max Output Current | 1.5A DC continuous; supports high-current digital loads such as DSPs, FPGAs, and microprocessor I/O rails. |
| Dropout Voltage | 38mV @ 150mA / 380mV @ 1.5A; enables operation with minimal VIN–VOUT margin - critical for battery-powered systems near end-of-life. |
| Ground Pin Current | 5mA @ 1.5A load; low quiescent current improves efficiency in high-load conditions compared to bipolar LDOs. |
| Shutdown Current | 15µA typical; allows deep power-down in portable devices without compromising wake-up latency. |
| Input Voltage Range | 2.5V to 7.0V operating; compatible with single-cell Li-ion (with boost), dual-cell NiMH, or intermediate bus supplies. |
| Junction Temp Range | −40°C to +125°C; qualified for automotive under-hood and industrial control environments. |
Pinout & Package
SOT-223-5 surface-mount package with exposed thermal pad (pin 3 = VOUT, pin 5 = GND); thermally optimized for PCB copper area dissipation without heatsink in ≤1.5A applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | SD (Shutdown) | CMOS-compatible active-low enable; requires 10kΩ pull-up for default-on operation; disables regulator and invalidates ERROR flag. |
| 2 | VIN | Main input supply connection; must be decoupled with ≥68µF low-ESR capacitor within 1 cm to ensure stability. |
| 3 | VOUT | Regulated 1.8V output; also serves as Kelvin return path for SENSE pin when remote sensing is not used. |
| 4 | SENSE/ADJ | Remote sense input (LP3965 variant); connects directly to load to eliminate PCB trace IR drop; tied to VOUT if unused. |
| 5 | GND | Power ground reference; must be connected to single-point ground plane shared with input/output capacitors to avoid instability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 38mV @ 150mA enables use with input voltages as low as 1.838V - essential for brownout resilience in battery systems. |
| Remote sense capability | SENSE pin compensates for up to ~150mV trace drop at 1.5A, maintaining ±1.5% regulation at the actual load point. |
| Fast transient response | Stabilizes within microseconds after 1A load steps - prevents logic glitches in high-speed microprocessors and memory interfaces. |
| Integrated protection | Thermal shutdown (165°C), current limiting (~4.5A short-circuit), and ERROR flag provide system-level fault visibility without external circuitry. |
| Low-noise operation | 150µVRMS (10Hz–100kHz) and 0.8µV/√Hz noise density support noise-sensitive analog and RF subsystems powered from same rail. |
Applications
| Microprocessor Core Supply | GTL/GTL+ Bus Termination |
|---|---|
|
Use Scenario: Powering 1.8V core logic of ARM Cortex-M or RISC-V SoCs in portable instrumentation. IC Role / Device Role / Timing Role: Primary low-noise, low-dropout voltage source delivering clean 1.8V at up to 1.5A with fast load-step recovery. Use Value: Maintains stable core voltage during burst-mode CPU activity; remote sense ensures <±20mV deviation at die pad despite PCB resistance. |
Use Scenario: Providing precise 1.8V termination voltage for GTL/GTL+ signaling on high-speed backplanes. IC Role / Device Role / Timing Role: Fixed-output LDO supplying matched termination voltage referenced to local ground, rejecting supply ripple. Use Value: ±1.5% output accuracy and 40dB PSRR at 120Hz ensure signal integrity and timing margin compliance per JEDEC GTL spec. |
| DSP Power Rail | Post-Regulator for Switching Supplies |
|
Use Scenario: Clean 1.8V supply for TI C6000 or Analog Devices SHARC DSPs in audio processing modules. IC Role / Device Role / Timing Role: Low-noise post-regulator removing switching artifacts from upstream DC/DC converter. Use Value: 150µVRMS broadband noise and 60dB PSRR at 100kHz prevent audible artifacts and ADC quantization errors. |
Use Scenario: Final-stage regulation after a 3.3V buck converter to achieve tight 1.8V tolerance for FPGA I/O banks. IC Role / Device Role / Timing Role: Precision LDO correcting line/load drift and ripple from primary switching regulator. Use Value: 0.04% load regulation and 0.02% line regulation minimize voltage drift across temperature and load, ensuring I/O timing compliance. |
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 |
|---|---|---|---|
| TPS7A0518PDBVR | 1.8V fixed, 0.5A max, 17µA IQ, no SENSE pin, 170mV dropout @ 500mA | Limited to lower-current applications; lacks remote sensing and thermal performance for 1.5A continuous loads. | Choose for space-constrained, low-IQ, sub-0.5A applications where remote sense is unnecessary. |
| TPS74801DRCR | Adjustable (1.2–5.5V), 1.5A, 200µA IQ, integrated soft-start, no ERROR flag | Requires external resistors; higher quiescent current; lacks fault reporting but adds programmability and inrush control. | Choose when output voltage flexibility or controlled startup is required, and ERROR monitoring is not needed. |
Compared with LP3965ET-1.8/NOPB, TPS7A0518PDBVR trades current capability and remote sensing for ultra-low IQ and smaller footprint, while TPS74801DRCR sacrifices fixed-voltage simplicity and fault flagging for adjustable output and soft-start - making LP3965ET-1.8/NOPB optimal for high-accuracy, high-current, fault-aware 1.8V core supplies.
Availability
LP3965ET-1.8/NOPB is available at Aetrix Electronics and suitable for microprocessor core supplies, GTL bus terminators, DSP power rails, and post-regulation applications requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.
Supply support for LP3965ET-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 power delivery solutions.
The LP3965 belongs to TI's ultra-low-dropout linear regulator product line, engineered specifically for high-current, low-voltage digital power domains including microprocessor, DSP, and memory interface applications demanding precision, speed, and robustness.
FAQ
What is the dropout voltage specification for LP3965ET-1.8/NOPB at full load?
The LP3965ET-1.8/NOPB has a typical dropout voltage of 380mV at 1.5A load current, defined as the minimum VIN–VOUT differential required to maintain output regulation within 2% of 1.8V. This value is confirmed across −40°C to +125°C junction temperature and reflects the 240mΩ typical RDS(on) of its internal PMOS pass device. At lighter loads (e.g., 150mA), dropout drops to 38mV.
Does LP3965ET-1.8/NOPB support remote voltage sensing, and how is it implemented?
Yes, LP3965ET-1.8/NOPB supports remote sensing via its dedicated SENSE/ADJ pin (Pin 4 in SOT-223-5). When connected directly to the load's power input node, the regulator closes its feedback loop at that point - compensating for voltage drop across PCB traces or connectors. If unused, the SENSE/ADJ pin must be tied directly to VOUT (Pin 3) to maintain standard regulation at the output pin.
What protection features are integrated into LP3965ET-1.8/NOPB?
LP3965ET-1.8/NOPB integrates overtemperature shutdown (165°C threshold with 10°C hysteresis), current limiting (~4.5A short-circuit protection), and an open-drain ERROR flag that asserts low when output voltage falls >10% below 1.8V due to input undervoltage, overload, or thermal foldback. Shutdown mode reduces quiescent current to 15µA.
What are the required external capacitors for stable operation of LP3965ET-1.8/NOPB?
LP3965ET-1.8/NOPB requires a minimum 68µF input capacitor (low-ESR ceramic or tantalum, ESR <100mΩ) placed ≤1 cm from VIN and GND pins, and a minimum 33µF output capacitor with ESR between 0.2Ω and 5Ω - typically solid tantalum. Ceramic capacitors alone are unsuitable for the output due to excessively low ESR, but may be paralleled with tantalum to improve high-frequency bypassing.
Is LP3965ET-1.8/NOPB pin-compatible with other devices in the LP396x family?
LP3965ET-1.8/NOPB shares identical pinout (SOT-223-5), electrical interface, and thermal pad layout with other LP3965 variants (e.g., LP3965ET-2.5/NOPB, LP3965ET-3.3/NOPB) and the LP3962 series - but differs functionally from LP3962 by including the SENSE/ADJ pin instead of ERROR. Pin compatibility holds only within the LP3965 fixed-output variants; LP3962 and LP3965 are not functionally interchangeable due to differing pin functions.
LP3965ET-1.8/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-220-5 Formed Leads
- Packaging:
- Tube
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 7V
- Voltage - Output (Min/Fixed):
- 1.8V
- 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:
- Through Hole
- Supplier Device Package:
- TO-220-5
LP3965ET-1.8/NOPB FAQ
1.How can I place an order for LP3965ET-1.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3965ET-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 LP3965ET-1.8/NOPB reliable?
The price and inventory of LP3965ET-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 LP3965ET-1.8/NOPB is usually 5 days.
3.What payment methods are accepted for LP3965ET-1.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3965ET-1.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3965ET-1.8/NOPB?
LP3965ET-1.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3965ET-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 LP3965ET-1.8/NOPB?
For technical support, including LP3965ET-1.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3965ET-1.8/NOPB requirements.
6.How does Aetrix verify that LP3965ET-1.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3965ET-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 LP3965ET-1.8/NOPB meets industry standards.
7.What is the process for return or replacement of LP3965ET-1.8/NOPB?
All LP3965ET-1.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3965ET-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 LP3965ET-1.8/NOPB part is unused and in its original packaging.
Return procedure for LP3965ET-1.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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