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Texas Instruments LP3874EMP-1.8/NOPB
- Part No.:
- LP3874EMP-1.8/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-261-5, TO-261AB
- Datasheet:
-
LP3874EMP-1.8/NOPB.pdf
- Description:
- IC REG LIN 1.8V 800MA SOT223-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,231
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Product details
Overview
LP3874EMP-1.8/NOPB from Texas Instruments is a 0.8-A ultra-low-dropout linear regulator in DDPAK/TO-263-5 package, delivering fixed 1.8 V output with ±1.5% accuracy at room temperature, 240 mV dropout at full load, and 10 nA shutdown quiescent current-designed for microprocessor core supplies and battery-powered systems requiring tight regulation under dynamic load.
For engineers reviewing the LP3874EMP-1.8/NOPB datasheet, LP3874EMP-1.8/NOPB pinout, LP3874EMP-1.8/NOPB application, or LP3874EMP-1.8/NOPB equivalent, key selection criteria include remote-sense capability (SENSE pin), ERROR flag for output monitoring, thermal protection, and compatibility with low-ESR tantalum output capacitors in space-constrained industrial and portable designs.
Technical Context
The LP3874EMP-1.8/NOPB uses a CMOS-based PMOS pass element enabling ultra-low dropout voltage and load-independent quiescent current. Its SENSE pin provides remote feedback to maintain ±0.04% load regulation at the point of load, distinct from the LP3871 which lacks this feature.
It integrates overtemperature and overcurrent protection with thermal shutdown, short-circuit limiting (2.3 A peak), and an open-drain ERROR flag that asserts low when output drops >10% below nominal-hysteresis ensures stable fault recovery without oscillation during marginal input conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V, ±1.5% tolerance at 25°C ensures stable core voltage for low-voltage microcontrollers and FPGAs. |
| Max Output Current | 0.8 A DC continuous-supports single-core processors and high-efficiency post-regulation in multi-rail power systems. |
| Dropout Voltage | 240 mV at 0.8 A load-enables operation from 2.04 V input, critical for Li-ion battery discharge down to 2.5 V system rails. |
| Quiescent Current | 10 nA in shutdown mode-minimizes battery drain in always-on IoT edge nodes and standby circuits. |
| Ground Pin Current | 6 mA at 0.8 A load-low bias current reduces total system power loss and eases thermal design. |
| ERROR Flag Threshold | 10% output drop (±5% hysteresis)-provides reliable undervoltage detection without false triggering during transient load steps. |
| Operating Temp Range | −40°C to +125°C junction-qualified for automotive under-hood, industrial motor control, and telecom infrastructure environments. |
Pinout & Package
LP3874EMP-1.8/NOPB is housed in a thermally enhanced DDPAK/TO-263-5 (KTT) package with exposed thermal pad, measuring 10.16 mm × 8.42 mm, optimized for high-power dissipation in compact PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Input supply connection | Accepts 2.5 V–7 V input; internal parasitic diode allows reverse-current limiting up to 200 mA DC if OUT > IN. |
| OUT | Regulated output node | Delivers 1.8 V to local loads; requires ≥10 µF low-ESR capacitor within 1 cm for stability. |
| GND | Power ground reference | Common return path for IN, OUT, and internal circuitry; connects to thermal pad for heat sinking. |
| ERROR | Open-drain fault indicator | Sinks 1 mA when asserted; must be pulled high via 10 kΩ resistor; invalid during shutdown. |
| SENSE | Remote output voltage sense | Connects directly to load point to compensate for PCB trace IR drop-enables <0.04% load regulation at remote location. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 240 mV at 0.8 A enables operation from single-cell Li-ion (2.5 V min) through full discharge curve. |
| Remote voltage sensing | SENSE pin improves regulation accuracy at point-of-load by eliminating PCB trace resistance error. |
| Integrated ERROR flag | Provides system-level fault signaling without external comparators-reduces BOM count and board area. |
| Thermal & short-circuit protection | Auto-recovering current limiting and thermal shutdown prevent damage during overload or poor heatsinking. |
| Low-noise operation | 150 µVRMS output noise (10 Hz–100 kHz) supports noise-sensitive analog and RF subsystems. |
Applications
| Microprocessor Core Supply | GTL/GTL+ Bus Termination |
|---|---|
Use Scenario: Powering ARM Cortex-M4 or RISC-V MCU cores operating at 1.8 V with burst-mode current draw up to 0.8 A. IC Role / Device Role / Timing Role: Primary LDO providing clean, tightly regulated VCORE with fast transient response to handle CPU clock scaling events. Use Value: 240 mV dropout preserves headroom during brown-out; 10 nA shutdown extends battery life in sleep modes. | Use Scenario: Terminating high-speed GTL bus lines in server memory controllers where precise 1.8 V termination voltage is required. IC Role / Device Role / Timing Role: Precision voltage reference source for parallel bus termination resistors, maintaining signal integrity at >100 MHz. Use Value: ±1.5% output accuracy and 0.04% load regulation ensure consistent logic threshold margins across temperature and load. |
| Post-Regulator for Switching Supplies | Battery-Powered Portable Instrumentation |
Use Scenario: Downstream LDO after a buck converter to suppress switching noise and meet ripple specs for ADC reference rails. IC Role / Device Role / Timing Role: Low-noise filtering stage removing 100–500 kHz switching artifacts from intermediate 2.5 V rail before stepping to 1.8 V. Use Value: 73 dB PSRR at 120 Hz and 150 µVRMS integrated noise enable 16-bit ADC performance without additional filtering. | Use Scenario: Main power regulator in handheld test equipment powered by two-series alkaline cells (3.0 V–3.2 V fresh). IC Role / Device Role / Timing Role: Efficient linear regulator delivering stable 1.8 V to mixed-signal SoC while minimizing battery depletion during idle periods. Use Value: 10 nA shutdown current and −40°C to +125°C rating support long shelf life and field operation in uncontrolled environments. |
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 |
|---|---|---|---|
| TPS7A0518PDBVR | 0.2-A rated, 170 mV dropout at 200 mA, no SENSE pin, no ERROR flag | Limited to low-current logic rails; unsuitable for 0.8-A loads or remote sensing | Select only for space-constrained, low-power auxiliary rails where full LP3874EMP-1.8/NOPB features are unnecessary. |
| MCP1826T-1802E/DC | 0.8-A rated, 300 mV dropout at 0.8 A, no SENSE, no ERROR, 1% initial accuracy | Lacks fault reporting and remote-sense capability; higher dropout reduces usable input range | Choose when ERROR/SENSE functions are omitted and tighter initial accuracy (1% vs ±1.5%) is prioritized over thermal performance. |
Compared with TPS7A0518PDBVR and MCP1826T-1802E/DC, the LP3874EMP-1.8/NOPB uniquely combines 0.8-A capability, SENSE-based remote regulation, and ERROR flag in a thermally robust TO-263 package-making it the only option among the three qualified for high-reliability, high-accuracy point-of-load regulation in demanding embedded systems.
Availability
LP3874EMP-1.8/NOPB is available at Aetrix Electronics and suitable for microprocessor core supplies, GTL bus terminators, and battery-powered instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LP3874EMP-1.8/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 connectivity technologies with broad industrial, automotive, and communications portfolio coverage.
The LP387x series was developed to address demand for high-current, ultra-low-dropout regulators in battery-powered and thermally constrained applications-emphasizing fast transient response, remote sensing, and integrated fault monitoring.
FAQ
What is the minimum input voltage required for LP3874EMP-1.8/NOPB to regulate 1.8 V output?
The LP3874EMP-1.8/NOPB requires a minimum input voltage of 2.04 V (1.8 V + 240 mV dropout) at 0.8 A load. Per datasheet Section 6.3, the absolute minimum VIN is 2.5 V unless VOUT + VDROPOUT exceeds that value-in this case, 2.04 V < 2.5 V, so 2.5 V is the practical lower limit for guaranteed operation across temperature and process variation. The LP3874EMP-1.8/NOPB will not regulate properly below 2.5 V input.
Does LP3874EMP-1.8/NOPB require an external pull-up resistor on the ERROR pin?
Yes, the ERROR pin is open-drain and must be pulled high with a 10 kΩ resistor to VIN or another valid supply. Without this pull-up, the ERROR signal cannot assert high-Z or logic-high states, rendering fault detection nonfunctional. The LP3874EMP-1.8/NOPB datasheet explicitly states this in Figure 12 and Section 7.4.3. Connecting ERROR directly to ground disables the flag entirely.
Can the SENSE pin of LP3874EMP-1.8/NOPB be left unconnected?
No, the SENSE pin must not be left floating. If remote sensing is not used, the SENSE pin must be connected directly to the OUT pin to ensure proper regulation. Leaving it unconnected risks instability or incorrect output voltage due to undefined feedback path-this requirement is specified in Section 7.3.4 of the LP3874EMP-1.8/NOPB datasheet.
What output capacitor type and value are recommended for LP3874EMP-1.8/NOPB?
Tantalum capacitors are recommended for the LP3874EMP-1.8/NOPB output, with minimum 10 µF capacitance and ESR between 100 mΩ and 4 Ω (per Figure 13). Ceramic capacitors may be used if X7R/X5R dielectric and sufficient voltage derating are applied-but their ESR is too low for inherent stability, requiring careful layout and possible series resistance. The LP3874EMP-1.8/NOPB will not remain stable with ESR outside the specified window.
Is LP3874EMP-1.8/NOPB pin-compatible with LP3871EMP-1.8/NOPB?
No, LP3874EMP-1.8/NOPB is not pin-compatible with LP3871EMP-1.8/NOPB. While both use the same DDPAK/TO-263-5 package, the LP3871 has no SENSE pin (pin 5 = ERROR); the LP3874 assigns pin 5 to SENSE and moves ERROR to pin 4. Swapping them without PCB revision will cause functional failure-specifically, missing remote sensing and misrouted ERROR signal. This difference is documented in Table "Pin Functions" on page 3 of the LP3874EMP-1.8/NOPB datasheet.
LP3874EMP-1.8/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-261-5, TO-261AB
- 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):
- 1.8V
- 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:
- SOT-223-5
LP3874EMP-1.8/NOPB FAQ
1.How can I place an order for LP3874EMP-1.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3874EMP-1.8/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 LP3874EMP-1.8/NOPB reliable?
The price and inventory of LP3874EMP-1.8/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3874EMP-1.8/NOPB is usually 5 days.
3.What payment methods are accepted for LP3874EMP-1.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3874EMP-1.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3874EMP-1.8/NOPB?
LP3874EMP-1.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3874EMP-1.8/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 LP3874EMP-1.8/NOPB?
For technical support, including LP3874EMP-1.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3874EMP-1.8/NOPB requirements.
6.How does Aetrix verify that LP3874EMP-1.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3874EMP-1.8/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 LP3874EMP-1.8/NOPB meets industry standards.
7.What is the process for return or replacement of LP3874EMP-1.8/NOPB?
All LP3874EMP-1.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3874EMP-1.8/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 LP3874EMP-1.8/NOPB part is unused and in its original packaging.
Return procedure for LP3874EMP-1.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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