My Inquiry
My Account
Texas Instruments LP3965ES-3.3/NOPB
- Part No.:
- LP3965ES-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LP3965ES-3.3/NOPB.pdf
- Description:
- IC REG LINEAR 3.3V 1.5A DDPAK
- Quantity:
- Payment:
- Shipping:
Inventory:246
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LP3965ES-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 25°C. It delivers fast load transient response for microprocessor power supplies and includes remote sense capability for improved regulation at distant loads.
For engineers reviewing the LP3965ES-3.3/NOPB datasheet, LP3965ES-3.3/NOPB pinout, LP3965ES-3.3/NOPB application, or LP3965ES-3.3/NOPB equivalent, key selection criteria include dropout performance under 1.5A load, SENSE pin functionality for PCB layout with long traces, shutdown quiescent current (15 µA), and compatibility with 33 µF/0.2–5 Ω ESR output capacitors.
Technical Context
The LP3965ES-3.3/NOPB uses a CMOS-based PMOS pass element with 240 mΩ typical RDS(on), enabling ultra-low dropout operation independent of load current. Its internal error amplifier compares VOUT (or SENSE) against a precision 1.216 V reference, delivering 0.04% load regulation and 0.02% line regulation.
It integrates thermal shutdown (165°C threshold, 10°C hysteresis), short-circuit protection (4.5 A limit), and an open-drain ERROR flag that asserts low when output drops >10% below nominal. Shutdown is controlled by a CMOS-compatible SD pin requiring external 10 kΩ pull-up.
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 battery-powered standby modes |
| 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 |
| Operating Input Range | 2.5 V to 7.0 V - compatible with single-cell Li-ion, 3.3 V/5 V system rails |
Pinout & Package
SOT-223-5 surface-mount package with exposed thermal pad (pin 3 is VOUT; pin 5 is GND; pin 4 is SENSE/ADJ - used for remote sensing in LP3965 variants).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SD) | Shutdown Control | CMOS-compatible input; pulls regulator into 15 µA shutdown when ≤0.2 V; requires 10 kΩ pull-up |
| 2 (VIN) | Input Supply | Accepts 2.5–7.0 V; must be decoupled with ≥68 µF low-ESR capacitor within 1 cm |
| 3 (VOUT) | Regulated Output | 3.3 V source; connects directly to load or to SENSE pin if local regulation is sufficient |
| 4 (SENSE/ADJ) | Remote Sense / Adj Reference | Connect to load point for improved regulation; if unused, tie directly to VOUT |
| 5 (GND) | Power Ground | Single-point Kelvin return for VIN, VOUT, and SENSE paths; critical for stability |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 38 mV @ 150 mA enables use in tight VIN–VOUT margins, e.g., 3.3 V rail powered from 3.6 V Li-ion |
| Remote sense capability | SENSE pin compensates for IR drop in PCB traces up to 100 mΩ, maintaining 3.3 V ±1.5% at load |
| Low-noise regulation | 150 µVRMS broadband noise supports ADC references, RF biasing, and PLL power domains |
| Fast transient response | Stabilizes within microseconds after 1 A load step - prevents microprocessor brownouts during burst activity |
| Integrated protection | Thermal shutdown (165°C), short-circuit limiting (4.5 A), and ERROR flag enable robust system-level fault handling |
Applications
| Microprocessor Core Power | GTL/GTL+ Bus Termination |
|---|---|
Use Scenario: Powers ARM Cortex-M or RISC-V SoC cores requiring clean, tightly regulated 3.3 V at up to 1.5 A with fast load steps. IC Role / Device Role / Timing Role: Primary LDO supplying CPU VDD_IO or core logic rail; SENSE pin ensures voltage compliance at BGA ball. Use Value: 0.04% load regulation and sub-40 mV dropout prevent voltage droop during instruction fetch bursts, avoiding timing violations. | Use Scenario: Provides termination voltage for high-speed GTL/GTL+ signaling on motherboard backplanes or memory controllers. IC Role / Device Role / Timing Role: Precision 3.3 V reference source for parallel bus terminators; low noise avoids signal integrity degradation. Use Value: ±1.5% initial accuracy and 0.02% line regulation maintain consistent termination impedance across supply variations. |
| DSP Analog Supply Rail | SCSI Active Terminator |
Use Scenario: Supplies analog section of audio or motor-control DSPs where PSRR and noise directly impact SNR. IC Role / Device Role / Timing Role: Low-noise post-regulator for DAC/ADC reference and op-amp biasing; PSRR >60 dB suppresses upstream switcher ripple. Use Value: 150 µVRMS noise and 60 dB PSRR at 120 Hz preserve dynamic range in 24-bit audio processing paths. | Use Scenario: Delivers stable 3.3 V to active SCSI terminators in server storage enclosures with variable cable lengths. IC Role / Device Role / Timing Role: Remote-sense LDO ensuring 3.3 V at terminator IC pins despite trace resistance up to 100 mΩ. Use Value: SENSE pin connection eliminates >150 mV IR drop error, guaranteeing SCSI signal eye diagram compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TSS721AIDR | Fixed 3.3 V, 1.5 A, no SENSE pin; 60 mV dropout @ 1.5 A; higher ground current (10 mA) | Lacks remote sensing; less suitable for long-trace or high-current termination loads | Choose when board space is constrained and remote regulation not required |
| TPS7A4701RGWR | Adjustable/3.3 V, 1 A, 31 µVRMS noise, 25 µA IQ; no ERROR flag or thermal shutdown | Lower noise but reduced current rating and missing fault reporting features | Prefer for ultra-low-noise analog rails where 1 A suffices and fault monitoring is handled externally |
Compared with TSS721AIDR and TPS7A4701RGWR, the LP3965ES-3.3/NOPB uniquely combines 1.5 A output, remote sense, ERROR flag, and thermal protection in a single SOT-223 package - making it optimal for industrial microprocessor and bus termination designs requiring both precision and robustness.
Availability
LP3965ES-3.3/NOPB is available at Aetrix Electronics and suitable for microprocessor power supplies, GTL bus terminators, and SCSI active terminators requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for LP3965ES-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, embedded processing, 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 bus power applications demanding fast transient response and remote sensing capability.
FAQ
What is the minimum input voltage required for LP3965ES-3.3/NOPB to regulate 3.3 V at full 1.5 A load?
The LP3965ES-3.3/NOPB requires a minimum input voltage of 3.68 V to maintain regulation at 1.5 A, based on its 380 mV typical dropout voltage (3.3 V + 0.38 V). The datasheet specifies VIN ≥ VOUT + VDROPOUT, and operation below 2.5 V input is prohibited. At lighter loads, VIN can be as low as 3.338 V (3.3 V + 38 mV) while remaining in regulation.
Can the SENSE pin of LP3965ES-3.3/NOPB be left unconnected?
No - the SENSE pin of LP3965ES-3.3/NOPB must never be left floating. If remote sensing is not used, it must be connected directly to the VOUT pin to ensure proper regulation. Leaving it unconnected risks instability or incorrect output voltage due to internal bias path disruption. This requirement is explicitly stated in the TI datasheet Section "SENSE PIN".
Does LP3965ES-3.3/NOPB include reverse current protection?
The LP3965ES-3.3/NOPB does not include active reverse current protection. Its internal PMOS pass device contains a parasitic body diode that conducts if VOUT exceeds VIN. The datasheet permits up to 200 mA continuous or 1 A peak reverse current, but external protection (e.g., series Schottky) is required for applications where VOUT may exceed VIN during hot-swap or backup power scenarios.
What output capacitor ESR range ensures stable operation of LP3965ES-3.3/NOPB?
LP3965ES-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 their sub-10 mΩ ESR; instead, use solid tantalum (recommended) or aluminum electrolytic with verified ESR in this range. The minimum capacitance is 33 µF, and the capacitor must maintain both value and ESR across −40°C to +125°C.
Is the ERROR flag on LP3965ES-3.3/NOPB active-high or active-low?
The ERROR flag on LP3965ES-3.3/NOPB is active-low and open-drain. It pulls low when output voltage drops >10% below 3.3 V (i.e., <2.97 V) due to dropout, overload, or thermal limit. An external 10 kΩ pull-up resistor to VIN is mandatory for proper logic-level operation; connecting ERROR directly to ground disables the function.
LP3965ES-3.3/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tube
- 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)
LP3965ES-3.3/NOPB FAQ
1.How can I place an order for LP3965ES-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3965ES-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 LP3965ES-3.3/NOPB reliable?
The price and inventory of LP3965ES-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 LP3965ES-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LP3965ES-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3965ES-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3965ES-3.3/NOPB?
LP3965ES-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3965ES-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 LP3965ES-3.3/NOPB?
For technical support, including LP3965ES-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3965ES-3.3/NOPB requirements.
6.How does Aetrix verify that LP3965ES-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3965ES-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 LP3965ES-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LP3965ES-3.3/NOPB?
All LP3965ES-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3965ES-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 LP3965ES-3.3/NOPB part is unused and in its original packaging.
Return procedure for LP3965ES-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP3965ES-3.3/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.…
