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Texas Instruments LP3872ESX-3.3/NOPB
- Part No.:
- LP3872ESX-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LP3872ESX-3.3/NOPB.pdf
- Description:
- IC REG LINEAR 3.3V 1.5A DDPAK
- Quantity:
- Payment:
- Shipping:
Inventory:323
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Product details
Overview
LP3872ESX-3.3/NOPB from Texas Instruments is a 1.5-A ultra-low-dropout linear regulator in SOT-223 package, delivering fixed 3.3 V output with ±1.5% accuracy at room temperature, 38 mV dropout at 150 mA, and 10 nA shutdown quiescent current. It serves as a primary power supply for low-voltage microprocessors and DSPs requiring fast transient response and stable regulation under battery-constrained conditions.
For engineers reviewing the LP3872ESX-3.3/NOPB datasheet, LP3872ESX-3.3/NOPB pinout, LP3872ESX-3.3/NOPB application, or LP3872ESX-3.3/NOPB equivalent, key selection criteria include verified 3.3 V output tolerance, ERROR flag functionality (LP3872-specific), thermal performance in SOT-223, and compatibility with 10 µF minimum output capacitance using tantalum or ceramic types.
Technical Context
The LP3872ESX-3.3/NOPB uses a CMOS-based PMOS pass transistor architecture enabling ultra-low dropout and load-independent quiescent current. Its internal ERROR flag comparator monitors output voltage with 10% threshold hysteresis and open-drain output, requiring external 10-kΩ pullup.
It operates across −40°C to 125°C junction temperature, supports input voltages from 2.5 V to 7 V, and integrates overtemperature and overcurrent protection. Unlike the LP3875, it lacks a SENSE pin and regulates voltage solely at the OUT pin-not at remote loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±1.5% at 25°C; ±3.0% over full temperature/load/line range |
| Max Output Current | 1.5 A DC continuous; peak output current up to 1.8 A |
| Dropout Voltage | 38 mV typical at 150 mA; 380 mV typical at 1.5 A load |
| Quiescent Current | 6 mA typical at 1.5 A load; 10 nA typical in shutdown mode |
| Ground Pin Current | 6 mA typical at 1.5 A load; increases to 15 mA max over temperature |
| PSRR | 73 dB at 120 Hz with VIN = VOUT + 1 V; 57 dB at VIN = VOUT + 0.5 V |
| ERROR Flag Threshold | 10% below nominal VOUT (i.e., 2.97 V at 3.3 V); 5%–16% hysteresis range |
Pinout & Package
SOT-223 (5-pin) package: 6.50 mm × 3.56 mm body size, thermally enhanced with exposed pad connected to GND; suitable for surface-mount assembly and moderate-power dissipation up to ~1.5 W with proper PCB copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SD | Input | CMOS-compatible shutdown control; must be pulled high via 10-kΩ resistor; logic low disables regulator and reduces IQ to 10 nA |
| 2 - IN | Input | Main power input (2.5 V to 7 V); connects to upstream source; internal parasitic diode allows reverse current up to 200 mA DC if OUT > IN |
| 3 - GND | Reference | Power ground reference for all internal circuitry and thermal path; exposed pad tied to GND plane for thermal conduction |
| 4 - OUT | Output | Regulated 3.3 V output; voltage regulated at this pin (not remote load); requires ≥10 µF output capacitor with ESR 100 mΩ–4 Ω |
| 5 - ERROR | Output | Open-drain error flag; asserts low when VOUT falls >10% below 3.3 V; requires external pullup; disabled during shutdown |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-Low Dropout | 38 mV at light load enables operation with <3.34 V input-critical for single-cell Li-ion or Li-poly systems |
| Active ERROR Flag | Dedicated open-drain output signals undervoltage condition before system reset, enabling early fault detection in microprocessor rails |
| Shutdown Mode | 10 nA IQ preserves battery life in always-on applications such as IoT sensors or portable medical devices |
| Load Regulation | 0.06% over 10 mA–1.5 A ensures stable 3.3 V delivery across dynamic CPU/DSP load transients |
| Thermal Protection | Internally limited power dissipation with thermal shutdown prevents damage during sustained overload or poor heatsinking |
Applications
| Microprocessor Core Supply | GTL/GTL+ Bus Termination |
|---|---|
|
Use Scenario: Powering ARM Cortex-M4 or similar low-voltage MCU cores requiring clean, tightly regulated 3.3 V with fast load-step response. IC Role / Device Role / Timing Role: Primary LDO regulator delivering core voltage; ERROR flag feeds system supervisor IC for brownout detection. Use Value: 38 mV dropout allows operation down to 3.338 V input-enabling longer runtime from partially discharged batteries. |
Use Scenario: Providing termination voltage for GTL/GTL+ signaling buses in server memory subsystems or FPGA I/O banks. IC Role / Device Role / Timing Role: Precision 3.3 V reference source for bus bias; low noise and tight line/load regulation minimize signal integrity degradation. Use Value: ±1.5% output accuracy and 0.06% load regulation ensure consistent VTT compliance across varying channel loading. |
| DSP Power Rail | Battery-Powered Instrumentation |
|
Use Scenario: Supplying analog and digital sections of TI C5000 or ADI SHARC DSPs where rail stability directly impacts ADC SNR and FFT accuracy. IC Role / Device Role / Timing Role: Low-noise post-regulator after switching converter; PSRR of 73 dB at 120 Hz suppresses switching ripple. Use Value: 150 µV RMS output noise (10 Hz–100 kHz) preserves dynamic range in precision signal processing paths. |
Use Scenario: Power management in handheld test equipment (e.g., DMMs, oscilloscope probes) operating from 2xAA or Li-ion cells. IC Role / Device Role / Timing Role: Main system regulator with shutdown control synchronized to host MCU sleep states. Use Value: 10 nA shutdown current extends shelf life and operational runtime between charges or battery replacements. |
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 |
|---|---|---|---|
| TSS721AIDR | Fixed 3.3 V, 1.5 A, but no ERROR flag; 60 mV dropout at 1.5 A; SOIC-8 package | Lacks fault monitoring capability; requires external supervision circuit for undervoltage detection | Select when ERROR flag is unnecessary and board space permits SOIC-8 footprint |
| TPS7A4701RGWR | Adjustable output (1.4 V–6.5 V), 1 A, 25 µV RMS noise, 240 mV dropout at 1 A, WQFN-20 | Higher precision (0.5% initial accuracy), lower noise, but lower current rating and no ERROR pin | Select when ultra-low noise and adjustable output outweigh need for 1.5 A and integrated fault signaling |
Compared with TSS721AIDR and TPS7A4701RGWR, the LP3872ESX-3.3/NOPB uniquely combines 1.5 A capability, integrated ERROR flag, sub-40 mV dropout at light load, and SOT-223 thermal profile-making it optimal for cost-sensitive, battery-powered systems requiring both robustness and fault visibility.
Availability
LP3872ESX-3.3/NOPB is available at Aetrix Electronics and suitable for microprocessor power supplies, GTL bus terminators, and battery-powered instrumentation requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for LP3872ESX-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 company headquartered in Dallas, Texas, designing and manufacturing analog, embedded processing, and connectivity products for industrial, automotive, and consumer markets.
The LP387x series was developed specifically for high-current, ultra-low-dropout applications in portable and always-on electronics-emphasizing fast transient response, minimal quiescent current in shutdown, and robust thermal protection.
FAQ
What is the maximum input voltage for LP3872ESX-3.3/NOPB?
The LP3872ESX-3.3/NOPB supports an absolute maximum input voltage of 7.5 V on the IN pin, with recommended operating range from 2.5 V to 7 V. Exceeding 7.5 V risks permanent damage per absolute maximum ratings. For reliable operation, maintain VIN ≥ VOUT + dropout voltage-i.e., ≥3.338 V at 150 mA or ≥3.68 V at 1.5 A load.
Does LP3872ESX-3.3/NOPB require an external sense resistor or feedback network?
No. The LP3872ESX-3.3/NOPB is a fixed-output regulator with internally trimmed 3.3 V reference; it does not use external resistors for feedback. Unlike the LP3875, it has no SENSE pin and regulates voltage only at the OUT pin. External components are limited to input/output capacitors and pullup resistors for SD and ERROR pins.
How does the ERROR flag on LP3872ESX-3.3/NOPB behave during shutdown?
When the SD pin is pulled low, the LP3872ESX-3.3/NOPB enters shutdown mode and the ERROR flag is forced invalid-its output becomes high-impedance and cannot indicate output status. The ERROR function resumes only after SD returns high and the device exits shutdown, typically within 25 µs turnon delay.
What output capacitor types are recommended for LP3872ESX-3.3/NOPB?
Tantalum capacitors are recommended for the LP3872ESX-3.3/NOPB output due to their stable ESR (100 mΩ–4 Ω) across temperature. Ceramic capacitors (X7R/X5R dielectric) are acceptable if ESR is ≥100 mΩ; avoid Z5U/Y5V ceramics due to severe voltage/temperature drift. Minimum capacitance is 10 µF, placed ≤1 cm from the OUT and GND pins.
Is LP3872ESX-3.3/NOPB RoHS-compliant and lead-free?
Yes. The /NOPB suffix explicitly denotes lead-free and RoHS-compliant packaging. The LP3872ESX-3.3/NOPB meets JEDEC J-STD-020 moisture sensitivity level 3 (MSL-3) and is qualified for reflow soldering per IPC/JEDEC J-STD-020 standards.
LP3872ESX-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):
- 0.55V @ 1.5A
- Current - Output:
- 1.5A
- Current - Quiescent (Iq):
- 5 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)
LP3872ESX-3.3/NOPB FAQ
1.How can I place an order for LP3872ESX-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3872ESX-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 LP3872ESX-3.3/NOPB reliable?
The price and inventory of LP3872ESX-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 LP3872ESX-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LP3872ESX-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3872ESX-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3872ESX-3.3/NOPB?
LP3872ESX-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3872ESX-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 LP3872ESX-3.3/NOPB?
For technical support, including LP3872ESX-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3872ESX-3.3/NOPB requirements.
6.How does Aetrix verify that LP3872ESX-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3872ESX-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 LP3872ESX-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LP3872ESX-3.3/NOPB?
All LP3872ESX-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3872ESX-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 LP3872ESX-3.3/NOPB part is unused and in its original packaging.
Return procedure for LP3872ESX-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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