My Inquiry
My Account
Texas Instruments LP3873ESX-3.3/NOPB
- Part No.:
- LP3873ESX-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LP3873ESX-3.3/NOPB.pdf
- Description:
- IC REG LIN 3.3V 3A DDPAK/TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,131
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LP3873ESX-3.3/NOPB from Texas Instruments is a 3A ultra-low-dropout linear regulator delivering a fixed 3.3V output with ±1.5% accuracy at room temperature, 800mV dropout at 3A load, and 6mA ground pin current under full load - designed for microprocessor core power supplies where fast transient response and tight regulation are critical.
For engineers reviewing the LP3873ESX-3.3/NOPB datasheet, LP3873ESX-3.3/NOPB pinout, LP3873ESX-3.3/NOPB application, or LP3873ESX-3.3/NOPB equivalent, key selection considerations include dropout performance at 3A, shutdown quiescent current (1µA), error flag behavior, thermal limits (−40°C to +125°C junction), and compatibility with low-ESR ceramic/tantalum output capacitors ≥10µF.
Technical Context
The LP3873ESX-3.3/NOPB uses a CMOS-based PMOS pass transistor architecture enabling ultra-low dropout voltage and load-independent quiescent current. Its error amplifier drives the pass element with high loop gain and bandwidth, supporting <50µs turn-on/turn-off delays and rapid recovery from 3A load transients.
It integrates overtemperature and overcurrent protection, an open-drain ERROR flag that asserts low when VOUT drops >10% below nominal, and requires external 10kΩ pull-up on SD and ERROR pins. Unlike the LP3876 variant, it lacks a SENSE pin and regulates voltage only at the VOUT pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1.5% (25°C), ±3.0% over full temp/load/line range - ensures stable core logic supply without external feedback. |
| Max Output Current | 3A DC continuous - supports high-current digital loads including microprocessors and DSPs. |
| Dropout Voltage | 800mV at 3A load - enables operation from 4.1V input while maintaining 3.3V output, critical for battery-backed or post-regulator applications. |
| Ground Pin Current | 6mA at 3A load - low bias current minimizes total system power loss and simplifies thermal design. |
| Shutdown Quiescent Current | 1µA - allows near-zero power draw during system sleep modes without external disconnect circuitry. |
| PSRR @ 120Hz | 73dB (VIN = VOUT + 1.0V) - suppresses ripple from upstream switching regulators in hybrid power architectures. |
| Output Noise (10Hz–100kHz) | 150µVrms - low noise preserves signal integrity in analog-sensitive subsystems powered from same rail. |
Pinout & Package
LP3873ESX-3.3/NOPB is packaged in a thermally enhanced 5-pin DDPAK/TO-263 surface-mount package with exposed thermal pad (KTT0005B). The package supports high-power dissipation via PCB copper area and is RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SD | Shutdown control input | CMOS-compatible active-low enable; must be pulled high via 10kΩ resistor for normal operation; forces regulator off and invalidates ERROR flag when asserted. |
| 2 - VIN | Input supply connection | Accepts 2.5V–7.0V input; internal parasitic diode allows reverse current up to 200mA DC if VOUT > VIN - requires external protection in back-drive scenarios. |
| 3 - GND | Power ground reference | Single-point Kelvin return path for VIN, VOUT, and external capacitors; critical for stability and low-noise performance. |
| 4 - VOUT | Regulated output terminal | Delivers 3.3V at up to 3A; voltage regulated at this pin (not remote load); requires ≥10µF low-ESR output capacitor within 1cm trace distance. |
| 5 - ERROR | Open-drain fault indicator | Asserts low when VOUT falls >10% below 3.3V due to dropout, overload, or thermal limit; requires external pull-up; disabled during shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 800mV at 3A enables use with 4.1V input sources - extends battery runtime and reduces heat in compact enclosures. |
| Fast transient response | Sub-50µs recovery from 3A load steps - maintains voltage stability for burst-mode processors without large bulk capacitance. |
| Integrated protection | Thermal shutdown and current limiting prevent damage during overload or poor heatsinking - no external circuitry required. |
| Low-noise regulation | 150µVrms broadband noise supports mixed-signal SoCs and ADC/DAC references sharing the 3.3V rail. |
| Error flag with hysteresis | 10% threshold with 5% hysteresis prevents chatter during marginal input conditions - provides clean system-level fault signaling. |
Applications
| Microprocessor Core Supply | GTL/GTL+ Bus Termination |
|---|---|
|
Use Scenario: Powering 3.3V I/O domains of FPGAs or ASICs with dynamic current demands up to 3A. IC Role / Device Role / Timing Role: Primary low-noise, fast-response LDO delivering stable 3.3V to high-speed logic interfaces. Use Value: Maintains <±3% output regulation across load steps and line variations, preventing bus timing violations and data corruption. |
Use Scenario: Providing precision termination voltage for GTL/GTL+ differential buses in server memory subsystems. IC Role / Device Role / Timing Role: Fixed 3.3V reference source with tight initial accuracy and low drift over temperature. Use Value: Ensures consistent bus impedance matching and signal integrity by holding termination voltage within ±1.5% at 25°C. |
| DSP Power Supply | Post-Regulator for Switching Supplies |
|
Use Scenario: Clean intermediate rail generation for TI C6000-series DSPs requiring low-noise 3.3V core voltage. IC Role / Device Role / Timing Role: Low-PSRR, low-noise linear post-regulator filtering ripple from upstream buck converters. Use Value: Delivers 73dB ripple rejection at 120Hz and 150µVrms noise - meets DSP analog subsystem SNR requirements. |
Use Scenario: Final-stage regulation after a 5V switching supply to feed sensitive analog circuits or clock buffers. IC Role / Device Role / Timing Role: Ultra-low-dropout buffer improving voltage accuracy and transient immunity of noisy intermediate rails. Use Value: Reduces input-to-output differential to 800mV at full load, minimizing power loss and thermal stress in space-constrained layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS75733KTTT | 3A LDO with 3.3V fixed output, 1.2V dropout at 3A, integrated power-good flag, higher quiescent current (125µA active). | Better thermal performance in TO-220 package but larger dropout reduces usable input range. | Choose for systems needing power-good signaling and higher ambient operating temperatures (>85°C). |
| MCP1703T-3302E/MB | 250mA LDO with 3.3V output, 600mV dropout at 250mA, 2µA shutdown current, SOT-223 package. | Lower current rating and smaller package - unsuitable for 3A loads but ideal for auxiliary rails or low-power peripherals. | Choose only for sub-500mA applications where board space and ultra-low shutdown current are prioritized over output capability. |
Compared with TPS75733KTTT and MCP1703T-3302E/MB, the LP3873ESX-3.3/NOPB uniquely balances 3A delivery, 800mV dropout, and 1µA shutdown current in a thermally robust DDPAK - making it optimal for high-current, low-input-margin embedded systems where efficiency and transient fidelity are co-critical.
Availability
LP3873ESX-3.3/NOPB is available at Aetrix Electronics and suitable for microprocessor core supplies, GTL bus terminators, DSP power rails, and post-regulator applications requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LP3873ESX-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 specializing in analog, embedded processing, and power management ICs, with decades of expertise in high-reliability linear regulation and thermal design.
The LP3873 series was engineered specifically for high-current, low-voltage microprocessor and DSP power delivery - emphasizing ultra-low dropout, fast transient response, and robust protection in thermally demanding environments.
FAQ
What is the minimum input voltage required for LP3873ESX-3.3/NOPB to regulate 3.3V at 3A?
The LP3873ESX-3.3/NOPB requires a minimum input voltage of 4.1V to maintain regulation at 3A load, based on its 800mV typical dropout voltage. At lighter loads, dropout decreases - e.g., 80mV at 300mA - allowing operation from as low as 3.38V input. Input must remain ≥2.5V regardless of load per absolute ratings.
Does LP3873ESX-3.3/NOPB support remote sensing like the LP3876?
No, LP3873ESX-3.3/NOPB does not include a SENSE pin. It regulates voltage solely at the VOUT pin. For remote load regulation, the LP3876 variant must be used - its SENSE pin connects directly to the load to compensate for PCB trace resistance. Using LP3873ESX-3.3/NOPB in remote-sense configurations results in voltage drop proportional to trace resistance and load current.
What output capacitor is required for stable operation of LP3873ESX-3.3/NOPB?
LP3873ESX-3.3/NOPB requires a minimum 10µF output capacitor with ESR between 10mΩ and 1Ω, placed within 1cm of the device and connected via dedicated Kelvin traces to VOUT and GND. Ceramic (X7R/X5R) or solid tantalum capacitors are recommended; aluminum electrolytics are discouraged due to high low-temp ESR variation.
How does the ERROR pin on LP3873ESX-3.3/NOPB behave during shutdown?
When the SD pin is pulled low, the LP3873ESX-3.3/NOPB enters shutdown mode and the ERROR pin is forced invalid - it neither asserts nor reflects output status. The ERROR function resumes only after SD returns high and the regulator completes turn-on delay (~25µs). During active operation, ERROR goes low when VOUT drops >10% below 3.3V, with 5% hysteresis.
Can LP3873ESX-3.3/NOPB be used with input voltages above 7.0V?
No - the absolute maximum input voltage for LP3873ESX-3.3/NOPB is +7.5V, but the guaranteed operating range is strictly 2.5V to 7.0V. Exceeding 7.0V risks violating electrical specifications and may cause premature failure. For higher input applications, a pre-regulator stage or alternative LDO with wider input range (e.g., TPS7A83A) is required.
LP3873ESX-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):
- 1.2V @ 3A
- Current - Output:
- 3A
- Current - Quiescent (Iq):
- 9 mA
- Current - Supply (Max):
- 15 mA
- PSRR:
- 73dB ~ 57dB (120Hz)
- 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)
LP3873ESX-3.3/NOPB FAQ
1.How can I place an order for LP3873ESX-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3873ESX-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 LP3873ESX-3.3/NOPB reliable?
The price and inventory of LP3873ESX-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 LP3873ESX-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LP3873ESX-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3873ESX-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3873ESX-3.3/NOPB?
LP3873ESX-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3873ESX-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 LP3873ESX-3.3/NOPB?
For technical support, including LP3873ESX-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3873ESX-3.3/NOPB requirements.
6.How does Aetrix verify that LP3873ESX-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3873ESX-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 LP3873ESX-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LP3873ESX-3.3/NOPB?
All LP3873ESX-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3873ESX-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 LP3873ESX-3.3/NOPB part is unused and in its original packaging.
Return procedure for LP3873ESX-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP3873ESX-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.…
