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Texas Instruments LP3874ES-3.3/NOPB
- Part No.:
- LP3874ES-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LP3874ES-3.3/NOPB.pdf
- Description:
- IC REG LINEAR 3.3V 800MA DDPAK
- Quantity:
- Payment:
- Shipping:
Inventory:181
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Product details
Overview
LP3874ES-3.3/NOPB from Texas Instruments is a 0.8-A ultra-low-dropout linear regulator in DDPAK/TO-263-5 package, delivering fixed 3.3 V output with ±1.5% accuracy at room temperature, 240 mV dropout at full load, and 10 nA shutdown quiescent current. It serves as a post-regulator for microprocessor core or I/O rails where tight regulation, fast transient response, and remote-sense capability are required.
For engineers reviewing the LP3874ES-3.3/NOPB datasheet, LP3874ES-3.3/NOPB pinout, LP3874ES-3.3/NOPB application, or LP3874ES-3.3/NOPB equivalent, key selection criteria include SENSE-pin-enabled remote load regulation, −40°C to +125°C junction temperature operation, integrated ERROR flag with 10% output undervoltage detection, and compatibility with low-ESR tantalum or ceramic output capacitors ≥10 µF.
Technical Context
The LP3874ES-3.3/NOPB uses a PMOS pass transistor on a CMOS process, enabling ultra-low dropout voltage independent of load current variation and supporting stable operation with output capacitance as low as 10 µF and ESR between 100 mΩ and 4 Ω. Its internal error amplifier compares either the OUT pin (LP3871) or SENSE pin (LP3874) voltage against a precision bandgap reference.
It integrates active overcurrent limiting with thermal foldback, short-circuit protection that cycles the pass element during sustained overload, and an open-drain ERROR flag with 5% hysteresis referenced to nominal VOUT. Shutdown is controlled by a logic-level SD input with 1 nA leakage and 25 µs turn-on delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V, ±1.5% tolerance at 25°C ensures reliable power delivery to 3.3-V logic interfaces without external feedback components. |
| Max Output Current | 0.8 A DC continuous output supports high-current digital loads such as DSPs, GTL+ bus terminators, or FPGA I/O banks. |
| Dropout Voltage | 240 mV at 0.8 A enables operation from 3.54 V input - critical for single-cell Li-ion or regulated 3.6-V supply systems. |
| Quiescent Current | 10 nA in shutdown mode minimizes battery drain in always-on portable equipment with long standby periods. |
| Ground Pin Current | 6 mA typical at 0.8 A load reduces PCB trace heating and improves efficiency versus older bipolar LDOs. |
| PSRR | 57 dB at 120 Hz with 0.5-V headroom suppresses ripple from upstream switching regulators feeding the LDO input. |
| ERROR Flag Threshold | 10% undervoltage detection (3.0 V for 3.3-V output) with 5% hysteresis prevents chatter during marginal input conditions. |
Pinout & Package
LP3874ES-3.3/NOPB is housed in a thermally enhanced DDPAK/TO-263-5 package (10.16 mm × 8.42 mm), with the exposed pad electrically connected to GND for optimal thermal dissipation (RθJC(bot) = 1°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Input voltage supply | Accepts 2.5 V to 7 V; connects to upstream source or filter capacitor; internal parasitic diode allows reverse current up to 200 mA if VOUT > VIN. |
| OUT | Regulated output | Delivers 3.3 V to local load; not used for regulation sensing in LP3874 - SENSE pin performs that function. |
| GND | Power ground reference | Common return path for IN, OUT, SD, ERROR, and SENSE; must be low-impedance connection to minimize noise and ground bounce. |
| ERROR | Open-drain fault indicator | Asserts low when VOUT drops ≥10% below nominal; requires external 10-kΩ pullup; disabled during shutdown. |
| SENSE | Remote output voltage sense | Connects directly to point-of-load to compensate for PCB trace IR drop; improves load regulation accuracy at remote ICs. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low-dropout architecture | 24 mV dropout at 80 mA enables use in sub-3.3-V input scenarios like partially discharged batteries or cascaded regulators. |
| SENSE pin for remote sensing | Enables <0.1% load regulation error at point-of-load even with 100-mΩ PCB trace resistance under 0.8-A load. |
| Integrated ERROR flag | Provides system-level fault signaling without external comparators - simplifies monitoring of 3.3-V rail integrity in microprocessor systems. |
| Thermal and short-circuit protection | Auto-cycles output during overload and activates thermal shutdown above 160°C junction temperature to prevent permanent damage. |
| Low-noise operation | 150 µVRMS output noise (10 Hz–100 kHz) avoids interference with sensitive analog circuits powered from same rail. |
Applications
| Microprocessor Core Power | GTL+/SSTL Bus Termination |
|---|---|
Use Scenario: Powers ARM Cortex-M or RISC-V MCU cores requiring tightly regulated 3.3 V with fast load-step response during burst-mode execution. IC Role / Device Role / Timing Role: Primary post-regulator supplying core logic voltage; SENSE pin compensates for voltage drop across power delivery network to CPU VDD pins. Use Value: Maintains 3.3 V ±1.5% under 0.8-A dynamic load steps, preventing timing violations or brownouts during instruction fetch bursts. | Use Scenario: Provides termination voltage for high-speed GTL+, SSTL-2, or BTL parallel buses in telecom line cards or server memory interfaces. IC Role / Device Role / Timing Role: Precision 3.3-V reference source for bus stub termination resistors; low output impedance ensures clean signal edges and reduced reflections. Use Value: 0.04% load regulation and 57 dB PSRR suppress noise coupling into data/address lines, improving eye diagram margin by ≥15%. |
| SCSI Terminator Supply | Battery-Powered Instrumentation |
Use Scenario: Generates stable 3.3 V for active SCSI-3 terminator networks in legacy storage enclosures with mixed 5-V/3.3-V signaling. IC Role / Device Role / Timing Role: Dedicated low-noise supply for termination ICs; ERROR flag signals rail collapse before SCSI bus lockup occurs. Use Value: 10-nA shutdown current extends shelf life of field-deployed storage modules; SENSE pin eliminates 50-mV drop errors at terminator IC inputs. | Use Scenario: Powers portable multimeters, handheld oscilloscopes, or gas analyzers operating from two AA cells (2.4–3.2 V) with boost converter followed by LDO. IC Role / Device Role / Timing Role: Final-stage regulator ensuring clean 3.3-V supply to ADCs, op-amps, and display controllers despite varying battery voltage. Use Value: 240-mV dropout allows full 0.8-A output down to 3.54-V input, maximizing usable battery capacity; 150-µVRMS noise prevents ADC quantization errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A4701RGWR | Lower noise (4.7 µVRMS), higher PSRR (70 dB), but only 100-mA output and 2-mm × 2-mm WQFN package. | Suitable for ultra-low-noise analog rails (e.g., precision ADC references), not for 0.8-A digital loads. | Select TPS7A4701RGWR only when noise performance outweighs current capability and thermal requirements. |
| MCP1826T-3302E/OT | Same 3.3-V fixed output and 0.8-A rating, but SOT-223 package, no SENSE pin, and 350-mV dropout at 0.8 A. | Lacks remote sensing; acceptable for local loads with short traces, but cannot correct for >50-mV IR drop. | Choose MCP1826T-3302E/OT for cost-sensitive, space-constrained designs where remote load regulation is unnecessary. |
Compared with LP3874ES-3.3/NOPB, TPS7A4701RGWR trades 0.8-A capability for superior analog performance, while MCP1826T-3302E/OT offers identical output current but sacrifices SENSE functionality and thermal robustness - making LP3874ES-3.3/NOPB the only option among the three supporting remote-sense precision regulation in high-current industrial applications.
Availability
LP3874ES-3.3/NOPB is available at Aetrix Electronics and suitable for microprocessor power supplies, GTL+/SSTL bus terminators, and battery-powered instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LP3874ES-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 logic devices for industrial, automotive, and communications markets.
The LP387x series was developed specifically for high-current, ultra-low-dropout applications in battery-powered and thermally constrained systems - emphasizing fast transient response, remote sensing, and robust protection features for mission-critical power rails.
FAQ
What is the minimum input voltage required for LP3874ES-3.3/NOPB to regulate 3.3 V at 0.8 A?
The minimum input voltage is determined by dropout: 3.3 V + 240 mV = 3.54 V. Per datasheet Section 6.3, LP3874ES-3.3/NOPB requires VIN ≥ 2.5 V, but for full 0.8-A output at 3.3 V, VIN must be ≥3.54 V to maintain regulation. Below this, output voltage collapses linearly with input.
Can LP3874ES-3.3/NOPB be used without connecting the SENSE pin?
Yes - the SENSE pin must be connected directly to the OUT pin if remote sensing is not needed. Leaving it floating violates absolute maximum ratings and may cause regulation instability. This configuration makes LP3874ES-3.3/NOPB functionally identical to LP3871 in local-regulation mode.
How does the ERROR flag on LP3874ES-3.3/NOPB behave during shutdown?
When the SD pin is pulled low, the ERROR flag is forced invalid and its output becomes indeterminate. The flag resumes normal operation only after SD returns high and the device exits shutdown - typically within 25 µs turn-on delay. During shutdown, ERROR must be externally pulled high or grounded per application guidance.
What output capacitor types are recommended for stable operation of LP3874ES-3.3/NOPB?
Tantalum capacitors are recommended for the output due to their stable ESR (100 mΩ to 4 Ω) across temperature. Ceramic capacitors may be used if X7R/X5R dielectric and ≥10 µF value are selected, but Z5U/Y5V types are unsuitable due to severe capacitance loss with bias and temperature. Aluminum electrolytics require careful ESR derating at low temperatures.
Does LP3874ES-3.3/NOPB support reverse current protection?
No - LP3874ES-3.3/NOPB contains an inherent body diode between IN and OUT. If VOUT exceeds VIN, reverse current flows up to 200 mA DC or 1 A peak. External reverse-blocking circuitry (e.g., series Schottky diode or ideal diode controller) is required for true reverse-current isolation in back-powering scenarios.
LP3874ES-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):
- 0.35V @ 800mA
- Current - Output:
- 800mA
- 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)
LP3874ES-3.3/NOPB FAQ
1.How can I place an order for LP3874ES-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3874ES-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 LP3874ES-3.3/NOPB reliable?
The price and inventory of LP3874ES-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 LP3874ES-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LP3874ES-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3874ES-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3874ES-3.3/NOPB?
LP3874ES-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3874ES-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 LP3874ES-3.3/NOPB?
For technical support, including LP3874ES-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3874ES-3.3/NOPB requirements.
6.How does Aetrix verify that LP3874ES-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3874ES-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 LP3874ES-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LP3874ES-3.3/NOPB?
All LP3874ES-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3874ES-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 LP3874ES-3.3/NOPB part is unused and in its original packaging.
Return procedure for LP3874ES-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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