My Inquiry
My Account
Texas Instruments LP3964ESX-ADJ/NOPB
- Part No.:
- LP3964ESX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LP3964ESX-ADJ/NOPB.pdf
- Description:
- IC REG LIN POS ADJ 800MA DDPAK
- Quantity:
- Payment:
- Shipping:
Inventory:1,681
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LP3964ESX-ADJ/NOPB from Texas Instruments is an adjustable ultra-low-dropout linear regulator delivering up to 800 mA output current with input voltage range 2.5 V to 7 V, dropout voltage as low as 24 mV at 80 mA, ±1.5% output voltage accuracy, and 15 µA shutdown quiescent current - designed for precision power regulation in microprocessor and DSP supply rails.
For engineers reviewing the LP3964ESX-ADJ/NOPB datasheet, LP3964ESX-ADJ/NOPB pinout, LP3964ESX-ADJ/NOPB application, or LP3964ESX-ADJ/NOPB equivalent, key selection considerations include remote-sense capability, thermal shutdown (165°C), short-circuit protection, SOT-223 package thermal performance (RθJA = 65.2°C/W), and adjustable output via ADJ pin with 1.216 V typical reference voltage.
Technical Context
The LP3964ESX-ADJ/NOPB uses a PMOS pass transistor architecture enabling ultra-low dropout operation independent of load current, with CMOS biasing ensuring stable 15 µA quiescent current in shutdown mode across temperature. Its internal error amplifier compares the ADJ pin voltage against a precision 1.216 V bandgap reference to regulate output.
Unlike fixed-output variants, the ADJ version replaces the ERROR flag with a SENSE/AD pin that serves dual functions: when used as ADJ, it sets output voltage via external resistor divider; when used as SENSE, it enables remote-load voltage regulation by closing the feedback loop at the load point rather than at the regulator output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 800 mA DC maximum - supports high-current digital loads including microprocessors and DSPs without derating at moderate ambient temperatures. |
| Input Voltage Range | 2.5 V to 7 V - compatible with single-cell Li-ion (3.0–4.2 V), 3.3 V/5 V system rails, and post-regulation from higher-voltage supplies. |
| Dropout Voltage | 24 mV @ 80 mA / 240 mV @ 800 mA - enables regulation from 3.3 V input to 3.0 V output or 2.5 V input to 2.3 V output with minimal headroom loss. |
| Output Accuracy | ±1.5% @ 25°C, ±3% over −40°C to 125°C - ensures stable core voltage for sensitive logic under thermal and line/load transients. |
| Quiescent Current | 15 µA in shutdown mode - critical for battery-powered systems requiring ultra-low standby power consumption. |
| Reference Voltage | 1.216 V (typ) at ADJ pin - defines output via R1/R2 divider: VOUT = 1.216 × (1 + R1/R2), enabling precise user-defined voltages from 1.22 V upward. |
| Thermal Shutdown | 165°C threshold with 10°C hysteresis - protects device during overload or poor heatsinking while allowing recovery without manual reset. |
Pinout & Package
SOT-223 (5-pin) package: 6.50 mm × 3.56 mm body size, exposed thermal pad on bottom, rated for 65.2°C/W junction-to-ambient thermal resistance with 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 for normal operation; ties to IN if unused. |
| IN (Pin 2) | Input supply connection | Accepts 2.5–7 V input; requires ≥68 µF low-ESR input capacitor placed within 1 cm for stability. |
| OUT (Pin 3) | Regulated output node | Delivers regulated voltage; connects to SENSE pin if remote sensing is not used. |
| GND (Pin 5) | Power ground reference | Common return path for input, output, and internal circuitry; must be low-impedance and directly connected to thermal pad. |
| SENSE/AD (Pin 4) | Feedback input (adjust/sense) | In ADJ mode: sets output voltage via resistor divider; in SENSE mode: closes feedback loop at remote load to compensate for trace IR drop. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 24 mV @ 80 mA enables operation with <200 mV input-output differential - critical for low-voltage, high-current applications like FPGA core rails. |
| Remote sense capability | SENSE pin allows regulation at load point, eliminating up to 80 mV error from 100 mΩ PCB trace resistance at 800 mA - improves system-level voltage accuracy. |
| Adjustable output | 1.216 V precision reference enables user-defined outputs from 1.22 V to >6 V using two external resistors - eliminates need for multiple fixed-voltage SKUs. |
| Robust protection | Integrated short-circuit limiting (2.8 A peak), thermal shutdown (165°C), and reverse-current blocking - reduces need for external protection components. |
| Low-noise regulation | 150 µVRMS output noise (10 Hz–100 kHz) and 60 dB PSRR @ 120 Hz - suitable for noise-sensitive analog and RF subsystems powered from same rail. |
Applications
| Microprocessor Core Supply | GTL/SSTL Bus Termination |
|---|---|
|
Use Scenario: Providing stable 1.2 V or 1.8 V core voltage to ARM Cortex-A series processors under dynamic load steps up to 800 mA. IC Role / Device Role / Timing Role: Primary LDO regulator delivering tightly regulated, low-noise power to CPU core logic with fast transient response (<25 µs turn-on delay). Use Value: Maintains voltage within ±3% during 100–800 mA load steps, preventing timing violations or brownouts during burst-mode execution. |
Use Scenario: Supplying termination voltage (e.g., 1.5 V for SSTL_15) to high-speed memory buses with distributed loads across PCB. IC Role / Device Role / Timing Role: Adjustable LDO with SENSE pin acting as remote-sense terminator regulator, compensating for PCB trace resistance between regulator and DRAM module. Use Value: Ensures <±10 mV regulation error at DDR4 memory pins despite 50–100 mΩ interconnect resistance - guarantees signal integrity and setup/hold timing margins. |
| DSP Power Rail | Battery-Powered Instrumentation |
|
Use Scenario: Powering TI C6000-series DSPs requiring 1.2 V core and 3.3 V I/O rails with simultaneous 600 mA peak current draw. IC Role / Device Role / Timing Role: High-current LDO supplying clean, ripple-free power to DSP analog front-end and digital processing blocks. Use Value: 60 dB PSRR at 120 Hz rejects switching noise from upstream DC/DC converters, preserving ADC SNR and FFT accuracy. |
Use Scenario: Regulating lithium-ion battery output (3.0–4.2 V) to 3.3 V for portable medical sensors operating 24/7 with multi-year battery life. IC Role / Device Role / Timing Role: Low-quiescent-current adjustable LDO enabling precise 3.3 V rail with 15 µA shutdown current and ±1.5% accuracy over temperature. Use Value: Extends battery runtime by minimizing no-load power loss while maintaining sensor ADC reference stability across −20°C to 60°C operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A4700RGWR | Lower noise (4.7 µVRMS), higher PSRR (70 dB @ 120 Hz), but lower max current (1 A) and higher dropout (120 mV @ 1 A); requires larger 10-µF ceramic output cap. | Preferred for ultra-low-noise analog signal chains (e.g., precision ADCs, audio codecs); less suited for high-current digital loads due to thermal limits in SOT-23. | Select TPS7A4700RGWR when noise and PSRR dominate over current capacity; verify thermal margin in SOT-23 at 800 mA. |
| MCP1826T-ADJ/DC | Higher dropout (350 mV @ 800 mA), wider input range (2.3–16 V), but lower accuracy (±2%) and no remote sense; SOT-223 package with similar RθJA. | Used in industrial controllers where input voltage varies widely (e.g., 12 V nominal with dips to 7 V); lacks SENSE functionality for remote loads. | Choose MCP1826T-ADJ/DC for cost-sensitive, wide-input applications without remote sensing needs; confirm dropout margin at minimum VIN. |
Compared with LP3964ESX-ADJ/NOPB, TPS7A4700RGWR offers superior noise performance but reduced thermal headroom at full load, while MCP1826T-ADJ/DC trades dropout and accuracy for broader input flexibility - making LP3964ESX-ADJ/NOPB optimal for compact, high-accuracy, remote-sense digital power delivery.
Availability
LP3964ESX-ADJ/NOPB is available at Aetrix Electronics and suitable for microprocessor core supplies, GTL/SSTL bus terminators, DSP power rails, battery-powered instrumentation, and other applications requiring stable component supply with tight voltage regulation and low dropout.
Supply support for LP3964ESX-ADJ/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 specializing in analog and embedded processing technologies, with leadership in power management ICs, data converters, and interface solutions.
The LP3964ESX-ADJ/NOPB belongs to TI's LP396x ultra-low-dropout linear regulator family, engineered for high-current, low-voltage digital systems where precision regulation, fast transient response, and remote sensing are essential.
FAQ
What is the function of the SENSE/AD pin on the LP3964ESX-ADJ/NOPB?
The SENSE/AD pin on the LP3964ESX-ADJ/NOPB serves dual roles: as ADJ, it accepts feedback from an external resistor divider to set the output voltage (VOUT = 1.216 V × (1 + R1/R2)); as SENSE, it closes the regulation loop at the remote load to compensate for PCB trace voltage drop. When not used for remote sensing, it must be connected directly to the OUT pin to maintain proper regulation - this configuration is mandatory for stable operation of the LP3964ESX-ADJ/NOPB.
What is the minimum input capacitance required for stable operation of the LP3964ESX-ADJ/NOPB?
The LP3964ESX-ADJ/NOPB requires a minimum 68 µF input capacitor with ESR <100 mΩ, placed within 1 cm of the IN and GND pins. This value assumes use of low-ESR ceramic or tantalum capacitors; aluminum electrolytics require higher capacitance to meet the CIN × ESR ≤ 1.5 constraint. Stability is compromised below this threshold, risking oscillation or load-transient overshoot - verifying capacitor ESR across −40°C to 125°C is essential for robust LP3964ESX-ADJ/NOPB deployment.
Does the LP3964ESX-ADJ/NOPB include thermal protection, and how does it behave?
Yes, the LP3964ESX-ADJ/NOPB incorporates thermal shutdown with a 165°C junction threshold and 10°C hysteresis. When temperature exceeds 165°C, the device disables the pass transistor and enters thermal shutdown; it automatically resumes regulation once junction temperature falls below 155°C. This protection operates independently of load or input conditions and is fully integrated - no external components are needed. The behavior is documented in the Electrical Characteristics table of the LP3964ESX-ADJ/NOPB datasheet under "OVERTEMPERATURE PROTECTION".
Can the LP3964ESX-ADJ/NOPB be used with ceramic output capacitors?
No, the LP3964ESX-ADJ/NOPB requires an output capacitor with ESR between 0.2 Ω and 5 Ω for loop stability, which excludes most ceramic capacitors due to their sub-10 mΩ ESR. Using ceramic-only output capacitance causes phase-margin loss and potential oscillation. Acceptable solutions include solid tantalum (recommended), polymer aluminum, or hybrid configurations - e.g., 100 µF tantalum in parallel with ≤3 µF ceramic - provided total ESR remains within spec. This requirement is explicitly stated in the LP3964ESX-ADJ/NOPB Application and Implementation section.
What is the typical reference voltage at the ADJ pin of the LP3964ESX-ADJ/NOPB, and how does it affect output accuracy?
The LP3964ESX-ADJ/NOPB features a precision 1.216 V (typ) bandgap reference at the ADJ pin, with ±1.5% tolerance at 25°C and ±3% over −40°C to 125°C. This reference directly determines output voltage via the external resistor divider (VOUT = 1.216 V × (1 + R1/R2)), meaning resistor tolerance and temperature drift contribute additively to overall output error. For example, using 1% resistors yields ~±2.5% total output variation - a key design consideration when specifying the LP3964ESX-ADJ/NOPB for precision applications.
LP3964ESX-ADJ/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:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 7V
- Voltage - Output (Min/Fixed):
- 1.216V
- Voltage - Output (Max):
- 5.1V
- 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)
LP3964ESX-ADJ/NOPB FAQ
1.How can I place an order for LP3964ESX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3964ESX-ADJ/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 LP3964ESX-ADJ/NOPB reliable?
The price and inventory of LP3964ESX-ADJ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3964ESX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LP3964ESX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3964ESX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3964ESX-ADJ/NOPB?
LP3964ESX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3964ESX-ADJ/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 LP3964ESX-ADJ/NOPB?
For technical support, including LP3964ESX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3964ESX-ADJ/NOPB requirements.
6.How does Aetrix verify that LP3964ESX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3964ESX-ADJ/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 LP3964ESX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LP3964ESX-ADJ/NOPB?
All LP3964ESX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3964ESX-ADJ/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 LP3964ESX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LP3964ESX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP3964ESX-ADJ/NOPB Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
