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Texas Instruments LP3875ET-3.3/NOPB
- Part No.:
- LP3875ET-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
LP3875ET-3.3/NOPB.pdf
- Description:
- IC REG LINEAR 3.3V 1.5A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:199
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Product details
Overview
LP3875ET-3.3/NOPB from Texas Instruments is a 1.5-A ultra-low-dropout linear regulator with fixed 3.3-V output, 380-mV dropout at full load, ±1.5% output voltage accuracy, and remote sense capability for precision regulation at point-of-load. It operates from 2.5 V to 7 V input and delivers stable power to microprocessor cores and DSPs in space-constrained industrial and battery-powered systems.
For engineers reviewing the LP3875ET-3.3/NOPB datasheet, LP3875ET-3.3/NOPB pinout, LP3875ET-3.3/NOPB application, or LP3875ET-3.3/NOPB equivalent, key selection criteria include its SENSE pin support for remote load regulation, 10-nA shutdown quiescent current, thermal/overcurrent protection, and TO-263 (DDPAK) package suitability for high-current thermal management.
Technical Context
The LP3875ET-3.3/NOPB uses a CMOS-based PMOS pass transistor architecture enabling ultra-low dropout and load-independent quiescent current. Its internal error amplifier compares the SENSE pin voltage against a precision bandgap reference to maintain regulation at the remote load, not just at the OUT pin.
It integrates active shutdown control via the SD pin, open-drain ERROR flag with 10% output undervoltage threshold and 5% hysteresis, and thermal shutdown that cycles the pass device under sustained overload-distinct from the LP3872 which lacks SENSE and has ERROR-only functionality.
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 1.8 A before foldback |
| Dropout Voltage | 380 mV typical at 1.5 A load; enables operation with VIN as low as 3.68 V |
| Ground Pin Current | 6 mA typical at 1.5 A load; enables accurate power loss calculation |
| Shutdown Quiescent Current | 10 nA typical; reduces battery drain in always-on standby modes |
| PSRR | 73 dB at 120 Hz (VIN = VOUT + 1 V); suppresses ripple from upstream switching supplies |
| Thermal Resistance θJA | 40.3°C/W for TO-263 package; supports >1 W dissipation at 25°C ambient |
Pinout & Package
LP3875ET-3.3/NOPB is packaged in a 5-pin DDPAK/TO-263 (KTT) thermally enhanced surface-mount package with exposed thermal pad. The package measures 10.16 mm × 8.42 mm and is optimized for PCB copper pour heat sinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SD (Pin 1) | Shutdown control input | CMOS-compatible logic input; must be pulled high via 10-kΩ resistor; drives regulator into 10-nA shutdown state when low |
| IN (Pin 2) | Input supply connection | Accepts 2.5 V to 7 V; connects to source of internal PMOS pass transistor |
| GND (Pin 3) | Power ground reference | Return path for ground pin current (6 mA at 1.5 A); must be low-impedance connection to minimize noise coupling |
| OUT (Pin 4) | Regulated output terminal | Delivers 3.3 V to local loads; used as feedback reference only if SENSE is unused |
| SENSE (Pin 5) | Remote voltage sense input | Connects directly to point-of-load to compensate for trace IR drop; enables <0.12% load regulation error at remote node |
Key Features
| Feature | Design Value |
|---|---|
| Remote Sense (SENSE) | Enables regulation at point-of-load instead of at regulator output, eliminating voltage drop across PCB traces up to 100 mΩ at 1.5 A |
| Ultra-Low Dropout | 380 mV at 1.5 A allows operation from single-cell Li-ion (3.6 V min) or 5-V rails with minimal headroom loss |
| 10-nA Shutdown Mode | Reduces system standby power to nanoampere level-critical for battery life in IoT edge nodes and portable medical devices |
| Integrated Protection | Thermal shutdown and short-circuit foldback prevent damage during fault conditions without external circuitry |
| High PSRR (73 dB) | Rejects low-frequency ripple from buck converters, enabling clean LDO post-regulation in mixed-signal SoC power domains |
Applications
| Microprocessor Core Supply | GTL/SSTL Bus Termination |
|---|---|
|
Use Scenario: Powering ARM Cortex-A series CPU cores requiring tightly regulated 3.3-V I/O rails with fast transient response. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering 1.5-A peak current with <10-µs load-step recovery. Use Value: SENSE pin ensures 3.3 V ±15 mV at CPU package ball, compensating for 150-mV IR drop across 100-mΩ PCB traces. |
Use Scenario: Providing termination voltage for GTL+, SSTL_18, and BTL bus interfaces in high-speed memory controllers. IC Role / Device Role / Timing Role: Low-noise, low-impedance 3.3-V reference source with <150 µVRMS output noise (10 Hz–100 kHz). Use Value: Ultra-low dropout and high PSRR prevent timing jitter induced by supply ripple on critical address/data strobes. |
| DSP Power Management | Battery-Powered Instrumentation |
|
Use Scenario: Supplying TI C6000 DSPs in real-time signal processing modules where dynamic load current varies from 10 mA to 1.5 A. IC Role / Device Role / Timing Role: Fast-response LDO maintaining regulation during 1-A/µs load transients without external compensation. Use Value: 0.06% load regulation ensures <2 mV output deviation across full load range-preserving ADC reference stability. |
Use Scenario: Powering handheld test equipment with lithium-polymer battery (3.0–4.2 V) and multi-mode operation (active/sleep). IC Role / Device Role / Timing Role: Main system regulator with shutdown mode activated during sleep to extend battery runtime. Use Value: 10-nA shutdown current enables >10-year shelf life; TO-263 thermal pad supports 1.2-W dissipation without heatsink. |
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 |
|---|---|---|---|
| TPS7A4700RGWR | 2-A, 1.2-V to 3.3-V adjustable, 33-µVRMS noise, no SENSE pin, 260-mV dropout at 1 A | Lacks remote sensing; requires external resistors for 3.3-V setting; better noise performance but higher cost | Choose when lowest noise is critical and point-of-load regulation is handled externally |
| MCP1825-3302E/DB | 1.5-A, fixed 3.3-V, 400-mV dropout at 1.5 A, no SENSE or ERROR flag, SOT-223 package | No remote sense or fault flag; smaller footprint but higher thermal resistance (65.2°C/W) limits power handling | Choose for cost-sensitive, space-constrained designs where trace IR drop is negligible and fault monitoring is unnecessary |
Compared with TPS7A4700RGWR and MCP1825-3302E/DB, LP3875ET-3.3/NOPB uniquely combines SENSE-based point-of-load regulation, ERROR flag reporting, and TO-263 thermal performance-making it optimal for high-reliability embedded systems where voltage accuracy at the load and fault visibility are mandatory.
Availability
LP3875ET-3.3/NOPB is available at Aetrix Electronics and suitable for microprocessor core supplies, GTL/SSTL bus terminators, DSP power management, and battery-powered instrumentation requiring stable component supply with long-term lifecycle assurance.
Supply support for LP3875ET-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 designing analog and embedded processing chips for industrial, automotive, and communications markets, with leadership in power management ICs since the 1980s.
The LP387x product line was developed to address ultra-low-dropout, high-current requirements in battery-powered and thermally constrained systems-specifically targeting point-of-load regulation where trace resistance degrades voltage accuracy.
FAQ
What is the minimum input voltage required for LP3875ET-3.3/NOPB to regulate at full 1.5-A load?
The minimum input voltage is determined by the dropout specification: 380 mV typical at 1.5 A. Therefore, LP3875ET-3.3/NOPB requires at least 3.3 V + 0.38 V = 3.68 V at the IN pin to maintain regulation under full load. This value increases to 3.85 V at 125°C per datasheet max dropout of 550 mV.
Can the SENSE pin of LP3875ET-3.3/NOPB be left unconnected?
No. The SENSE pin must be either connected to the remote load point for improved regulation or tied directly to the OUT pin if remote sensing is not used. Leaving it floating may cause instability or incorrect regulation. LP3875ET-3.3/NOPB will not function reliably with an open SENSE pin.
Does LP3875ET-3.3/NOPB include reverse current protection?
LP3875ET-3.3/NOPB does not include active reverse current protection. Its internal PMOS pass transistor has a body diode that conducts if VOUT exceeds VIN. The datasheet specifies this diode can safely handle 200 mA DC or 1 A peak current-external protection is required for bidirectional current blocking.
How does the ERROR flag on LP3875ET-3.3/NOPB behave during shutdown?
When the SD pin is pulled low, LP3875ET-3.3/NOPB disables the ERROR flag output-the pin becomes invalid and should not be monitored. The ERROR flag only functions in active mode and asserts low when output voltage drops ≥10% below nominal (i.e., ≤2.97 V for LP3875ET-3.3/NOPB), with 5% hysteresis to prevent chatter.
What is the recommended output capacitor for LP3875ET-3.3/NOPB in a 1.5-A application?
Tantalum capacitors are recommended for LP3875ET-3.3/NOPB output stabilization: minimum 10 µF with ESR between 100 mΩ and 4 Ω. Ceramic capacitors may be used if X7R/X5R dielectric is selected and ESR remains within stability limits-but tantalum provides optimal phase margin and temperature-stable ESR across −40°C to 125°C.
LP3875ET-3.3/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:
- 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:
- Through Hole
- Supplier Device Package:
- TO-220-5
LP3875ET-3.3/NOPB FAQ
1.How can I place an order for LP3875ET-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3875ET-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 LP3875ET-3.3/NOPB reliable?
The price and inventory of LP3875ET-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 LP3875ET-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LP3875ET-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3875ET-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3875ET-3.3/NOPB?
LP3875ET-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3875ET-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 LP3875ET-3.3/NOPB?
For technical support, including LP3875ET-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3875ET-3.3/NOPB requirements.
6.How does Aetrix verify that LP3875ET-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3875ET-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 LP3875ET-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LP3875ET-3.3/NOPB?
All LP3875ET-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3875ET-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 LP3875ET-3.3/NOPB part is unused and in its original packaging.
Return procedure for LP3875ET-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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