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Texas Instruments LP3964ET-ADJ/NOPB
- Part No.:
- LP3964ET-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
LP3964ET-ADJ/NOPB.pdf
- Description:
- IC REG LIN POS ADJ 800MA TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:996
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Product details
Overview
LP3964ET-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. It serves as a precision post-regulator in microprocessor power supplies requiring stable low-noise DC output.
For engineers reviewing the LP3964ET-ADJ/NOPB datasheet, LP3964ET-ADJ/NOPB pinout, LP3964ET-ADJ/NOPB application, or LP3964ET-ADJ/NOPB equivalent, key selection criteria include remote-sense capability for load regulation, thermal/overcurrent protection behavior, minimum output capacitor ESR requirements (0.2–5 Ω), and SENSE/ADJ pin configuration for adjustable output design.
Technical Context
The LP3964ET-ADJ/NOPB uses a PMOS pass element with typical RDS(on) of 240 mΩ, enabling ultra-low dropout operation across its full 800-mA load range. Its CMOS-based control architecture delivers 25 µs turn-on delay and supports fast transient response critical for DSP and microprocessor core rails.
Unlike fixed-output variants, the ADJ version replaces the ERROR flag with a SENSE/ADJ pin-configured as an adjustable feedback node referencing 1.216 V (typ) at the ADJ terminal. This enables programmable output voltages from 1.216 V to (VIN – VDROPOUT) while retaining remote-sense functionality when wired to load terminals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 800 mA DC maximum - supports high-current digital loads without external boost circuitry. |
| Input Voltage Range | 2.5 V to 7 V - compatible with single-cell Li-ion, 3.3-V/5-V system rails, and intermediate bus architectures. |
| Dropout Voltage | 24 mV at 80 mA / 240 mV at 800 mA - enables regulation from 3.3-V input to 3.0-V output with <100 mV headroom. |
| Output Voltage Accuracy | ±1.5% at 25°C - ensures tight tolerance for sensitive analog or mixed-signal supply domains. |
| Quiescent Current | 15 µA in shutdown mode - minimizes battery drain in always-on or standby subsystems. |
| Ground Pin Current | 4 mA at 800 mA load - low bias current reduces total system power loss and improves efficiency at full load. |
| Thermal Shutdown | 165°C threshold with 10°C hysteresis - provides robust overtemperature protection without latch-up. |
Pinout & Package
LP3964ET-ADJ/NOPB is packaged in TO-263-5 (SFM) with exposed thermal pad, 10.16 mm × 8.42 mm body size, optimized for high-power dissipation in industrial and embedded applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Input supply connection | Accepts 2.5–7 V; must be decoupled with ≥68 µF low-ESR capacitor within 1 cm of pin. |
| OUT | Regulated output node | Delivers adjustable output; connects to SENSE pin if remote sensing is not used. |
| GND | Power ground reference | Common return path for IN, OUT, and ADJ; requires low-inductance PCB layout. |
| SD | Shutdown control input | CMOS-compatible active-low enable; requires 10-kΩ pullup to IN if unused. |
| SENSE/ADJ | Feedback/adjust node | Configured as ADJ for output setting (1.216 V reference); tied to OUT for fixed-mode operation or to remote load for sense compensation. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Output Voltage | Set via external resistor divider from 1.216 V reference - enables custom rail generation without discrete regulators. |
| Remote Sense Capability | SENSE pin monitors load-side voltage - compensates for trace IR drop and maintains ±0.02% load regulation at point-of-load. |
| Ultra-Low Dropout Performance | 24 mV dropout at light load - extends usable battery life and supports low-headroom system designs. |
| Stable with Low-ESR Capacitors | Validated with 33 µF output cap and 0.2–5 Ω ESR - allows use of cost-effective solid tantalum instead of expensive polymer or hybrid types. |
| Integrated Protection | Short-circuit limiting (2.8 A peak), thermal shutdown (165°C), and reverse-current blocking - eliminates need for external protection components. |
Applications
| Microprocessor Core Supply | GTL/GTL+ Bus Termination |
|---|---|
|
Use Scenario: Powering ARM Cortex-A series SoCs requiring tightly regulated 1.2 V–1.8 V core voltage with fast load transients. IC Role / Device Role / Timing Role: Primary low-noise post-regulator delivering clean DC after buck converter; handles >100 mA/µs load steps. Use Value: 150 µVRMS output noise and 25 µs turn-on delay ensure stable clock domain operation and prevent logic errors during dynamic frequency scaling. |
Use Scenario: Providing precise 1.2 V termination voltage for GTL+ signaling on high-speed backplanes. IC Role / Device Role / Timing Role: Point-of-load regulator placed adjacent to bus connector to minimize impedance-induced voltage sag. Use Value: Remote sense capability maintains ±0.02% load regulation across 100 mΩ trace resistance, preserving signal integrity margins under full bus loading. |
| DSP Power Management | Battery-Powered Instrumentation |
|
Use Scenario: Supplying 3.3 V to TI C6000 DSPs in portable test equipment with variable load profiles. IC Role / Device Role / Timing Role: Main supply rail with shutdown control synchronized to measurement cycles to reduce idle power. Use Value: 15 µA shutdown current and 240 mV dropout at 800 mA extend runtime by >18% versus standard LDOs in intermittent-use applications. |
Use Scenario: Regulating lithium-polymer battery output (3.0–4.2 V) to 2.5 V for precision ADC front-end in handheld meters. IC Role / Device Role / Timing Role: Low-noise analog supply isolating sensitive analog circuitry from digital switching noise. Use Value: 40 dB PSRR at 100 kHz and 150 µVRMS integrated noise preserve 16-bit ADC ENOB performance across battery discharge curve. |
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), but 1-A max output and 1.4-V min input - requires ≥1.4 V headroom. | Preferred for ultra-low-noise analog rails (e.g., RF receivers); less suitable for battery-powered systems below 1.4 V VIN. | Select TPS7A4700RGWR when noise <5 µVRMS is mandatory and input headroom ≥1.4 V is available. |
| MCP1826T-ADJ/DC | Higher dropout (300 mV at 800 mA), wider temp range (−40°C to 150°C), no remote sense - simpler BOM but lower efficiency. | Better suited for automotive engine-control modules where extended temperature rating is critical over low-dropout performance. | Choose MCP1826T-ADJ/DC for under-hood applications requiring 150°C operation, accepting higher dropout penalty. |
Compared with TPS7A4700RGWR and MCP1826T-ADJ/DC, LP3964ET-ADJ/NOPB uniquely balances ultra-low dropout (24 mV), remote sense capability, and 800-mA output in a TO-263 package - making it optimal for space-constrained, battery-sensitive, and point-of-load designs where both efficiency and regulation accuracy are critical.
Availability
LP3964ET-ADJ/NOPB is available at Aetrix Electronics and suitable for microprocessor core supplies, GTL+ bus terminators, DSP power management, battery-powered instrumentation, and precision analog subsystems requiring stable component supply with guaranteed long-term availability.
Supply support for LP3964ET-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 designing analog ICs, embedded processors, and digital signal solutions for industrial, automotive, and communications markets.
The LP396x family was developed as fast ultra-low-dropout linear regulators targeting low-voltage microprocessor and DSP applications where minimal input-to-output differential and rapid load transient response are essential.
FAQ
What output voltage range can be set using the ADJ pin on LP3964ET-ADJ/NOPB?
The LP3964ET-ADJ/NOPB features an internal 1.216 V (typ) reference at the SENSE/ADJ pin, enabling adjustable output voltages from 1.216 V up to (VIN – VDROPOUT). With VIN = 7 V and 240 mV dropout at full load, the practical maximum is ~6.76 V. Minimum output is constrained by reference tolerance (±1.5%) and resistor-divider stability - verified down to 1.2 V in TI application notes.
How does the SENSE/ADJ pin function differently in LP3964ET-ADJ/NOPB versus fixed-output LP3964 variants?
In LP3964ET-ADJ/NOPB, the SENSE/ADJ pin serves exclusively as the feedback adjust node - connected to a resistor divider between OUT and GND to set output voltage. Fixed-output LP3964 variants use this same pin as a dedicated SENSE input for remote load regulation. The ADJ version does not support remote sensing; its pin is strictly for voltage programming and must be tied to OUT only if adjustment is disabled.
What is the minimum output capacitor ESR requirement for stable operation of LP3964ET-ADJ/NOPB?
LP3964ET-ADJ/NOPB requires an output capacitor with ESR between 0.2 Ω and 5 Ω for loop stability. This range accommodates solid tantalum capacitors (typical ESR ~0.5–2 Ω) but excludes most ceramic types due to their sub-10 mΩ ESR. Using a 33 µF tantalum with 0.8 Ω ESR meets spec; adding parallel ceramics is permissible only if total effective ESR remains ≥0.2 Ω.
Can LP3964ET-ADJ/NOPB operate with input voltage below 2.5 V?
No - LP3964ET-ADJ/NOPB has a specified minimum input voltage of 2.5 V per TI's Recommended Operating Conditions. Operation below 2.5 V violates absolute maximum ratings and may cause unregulated output, increased dropout, or thermal instability. For sub-2.5 V inputs, consider TI's TPS7A05 or similar nanosupply LDOs designed for 1.4-V operation.
Does LP3964ET-ADJ/NOPB include reverse current protection?
LP3964ET-ADJ/NOPB contains an inherent parasitic body diode in its PMOS pass transistor. When VOUT exceeds VIN, this diode becomes forward-biased and allows reverse current up to 200 mA continuous or 1 A peak. No active reverse-current blocking is implemented - external Schottky diodes are required in back-powering scenarios where reverse conduction must be prevented.
LP3964ET-ADJ/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:
- 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:
- Through Hole
- Supplier Device Package:
- TO-220-5
LP3964ET-ADJ/NOPB FAQ
1.How can I place an order for LP3964ET-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3964ET-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 LP3964ET-ADJ/NOPB reliable?
The price and inventory of LP3964ET-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 LP3964ET-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LP3964ET-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3964ET-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3964ET-ADJ/NOPB?
LP3964ET-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3964ET-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 LP3964ET-ADJ/NOPB?
For technical support, including LP3964ET-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3964ET-ADJ/NOPB requirements.
6.How does Aetrix verify that LP3964ET-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3964ET-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 LP3964ET-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LP3964ET-ADJ/NOPB?
All LP3964ET-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3964ET-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 LP3964ET-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LP3964ET-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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