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Texas Instruments LP3874EMPX-ADJ/NOPB
- Part No.:
- LP3874EMPX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-261-5, TO-261AB
- Datasheet:
-
LP3874EMPX-ADJ/NOPB.pdf
- Description:
- IC REG LIN POS ADJ 800MA SOT223
- Quantity:
- Payment:
- Shipping:
Inventory:700
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Product details
Overview
LP3874EMPX-ADJ/NOPB from Texas Instruments is an adjustable ultra-low-dropout linear regulator IC delivering up to 0.8A output current with 24mV typical dropout at 80mA, 1.216V internal reference voltage, and 10nA shutdown quiescent current. It operates from 2.5V to 7.0V input and supports microprocessor core power, GTL bus termination, and post-regulation in battery-powered systems.
For engineers reviewing the LP3874EMPX-ADJ/NOPB datasheet, LP3874EMPX-ADJ/NOPB pinout, LP3874EMPX-ADJ/NOPB application, or LP3874EMPX-ADJ/NOPB equivalent, key selection criteria include dropout performance at full load, ADJ-pin bias current (10nA), thermal derating for SOT-223 package (θJA = 90°C/W), and mandatory feed-forward capacitor (CFF) for stability.
Technical Context
The LP3874EMPX-ADJ/NOPB uses a PMOS pass element enabling ultra-low dropout operation independent of load current, with CMOS-based control circuitry ensuring stable 10nA shutdown current across temperature. Its feedback loop relies on external R1/R2 resistors setting VOUT = 1.216 × (1 + R1/R2), while CFF introduces phase lead at ~45kHz for compensation.
It integrates overtemperature and overcurrent protection, features 0.04% load regulation, and requires a minimum 10µF tantalum output capacitor with ESR within the stable region shown in Figure 16. The SOT-223-5 package mandates single-point ground layout and Kelvin connections for CIN/COUT to avoid instability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 0.8A DC maximum - supports high-current digital loads without thermal shutdown under proper PCB copper area. |
| Dropout Voltage | 24mV @ 80mA / 240mV @ 0.8A - enables operation with minimal VIN–VOUT margin, critical for low-voltage rails like 1.8V or 2.5V. |
| Adjust Pin Voltage | 1.216V (typ) - sets output via external resistor divider; tolerance ±1.4% with 1% resistors. |
| Shutdown Quiescent Current | 10nA (typ) - allows true zero-power state in battery-critical applications such as portable instrumentation. |
| Ground Pin Current | 6mA @ 0.8A load - contributes directly to total power dissipation; must be included in PD = (VIN−VOUT)IOUT + VINIGND calculations. |
| PSRR | 73dB @ 120Hz (VIN = VOUT+1V) - suppresses low-frequency ripple from upstream switching supplies before sensitive analog or RF stages. |
| Output Noise | 150µVrms (10Hz–100kHz, VOUT = 2.5V) - suitable for noise-sensitive analog subsystems including ADC references and PLL power rails. |
Pinout & Package
SOT-223-5 surface-mount package with exposed thermal pad (Package Number NDC0005A); requires ≥0.5in² 1oz copper area for thermal management per TI datasheet Figure 19.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SD | Shutdown control input | CMOS-compatible logic input; must be actively pulled up via 10kΩ if driven by open-drain source; pulls regulator into 10nA shutdown state when ≤0.3V. |
| 2 - VIN | Input supply connection | Accepts 2.5V–7.0V; requires ≥10µF input capacitor; parasitic body diode conducts if VOUT > VIN (max 200mA DC). |
| 3 - VOUT | Regulated output node | Delivers adjustable voltage; connects directly to 10µF+ tantalum output capacitor with low-ESR trace; Kelvin-connected to minimize noise coupling. |
| 4 - ADJ | Feedback reference input | Senses 1.216V reference; draws only 10nA bias current; determines VOUT via R1/R2 ratio; error increases if R1 > 100kΩ. |
| 5 - GND | Power ground return | Single-point ground connection for VIN, VOUT, and COUT; must not share traces with other system grounds to prevent instability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout architecture | PMOS pass device enables 24mV dropout at light load - preserves headroom for sub-3V systems where every millivolt counts. |
| Stable with low-ESR capacitors | Validated with 10µF tantalum (not ceramic-only); ESR curve in Figure 16 defines stable operating region - eliminates need for costly polymer caps. |
| Integrated protection | Thermal shutdown and short-circuit current limiting (2.3A peak) - prevents damage during fault conditions without external circuitry. |
| Fast transient response | Load step recovery <50µs (Figures 11–15) - maintains regulation during CPU burst-mode operation without excessive output capacitance. |
| Low-noise CMOS design | 150µVrms broadband noise - avoids adding jitter to clock buffers or degrading SNR in precision data converters. |
Applications
| Microprocessor Core Power | GTL/GTL+ Bus Termination |
|---|---|
Use Scenario: Powering 1.2V–2.5V core rails for ARM Cortex-M or FPGA fabric under dynamic load changes. IC Role / Device Role / Timing Role: Primary LDO providing clean, low-noise, fast-response voltage rail with <50µs transient recovery. Use Value: Prevents brownout during CPU burst mode; 240mV dropout at 0.8A enables use with 3.3V intermediate bus. | Use Scenario: Biasing GTL+ stubs in high-speed memory interfaces requiring precise 1.2V termination. IC Role / Device Role / Timing Role: Adjustable voltage source setting VTT = VDDQ/2 with tight load regulation (0.04%). Use Value: Maintains signal integrity across temperature; 10nA shutdown disables termination during standby without leakage path. |
| DSP Power Supply | Battery-Powered Instrumentation |
Use Scenario: Supplying 3.3V I/O and 1.8V core to TI C6000 DSPs in real-time audio processing systems. IC Role / Device Role / Timing Role: Post-regulator cleaning switching supply ripple; PSRR >73dB at 120Hz rejects SMPS noise. Use Value: Enables clean ADC sampling and low-jitter DAC output without additional filtering stages. | Use Scenario: Regulating lithium-ion battery (3.0–4.2V) down to 2.5V for low-power sensor nodes with multi-year battery life. IC Role / Device Role / Timing Role: Main power converter with 10nA shutdown mode activated between sensor readings. Use Value: Extends battery runtime by minimizing quiescent loss; 0.8A capability supports brief wireless transmission bursts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TSS721AIDR | Fixed 3.3V output; no ADJ pin; 150mA max output; SOIC-8 package | Limited to fixed-voltage use cases; unsuitable for programmable rails or >0.15A loads | Select only when output voltage is fixed and current <150mA; no resistor network required. |
| TPS7A4701RGWR | 20V max VIN; 1A output; 4µVrms noise; WQFN-20 package; higher cost | Supports wider input range and lower noise; requires more complex layout and larger board area | Choose for ultra-low-noise analog rails (e.g., RF bias) where 150µVrms is insufficient. |
Compared with TSS721AIDR, LP3874EMPX-ADJ/NOPB offers 5.3× higher output current and full adjustability but lacks fixed-voltage simplicity; versus TPS7A4701RGWR, it trades 30× higher noise for 40% lower cost, smaller footprint, and adequate performance for digital logic rails.
Availability
LP3874EMPX-ADJ/NOPB is available at Aetrix Electronics and suitable for microprocessor core power, GTL bus termination, and battery-powered instrumentation requiring stable component supply across industrial temperature ranges (−40°C to +125°C).
Supply support for LP3874EMPX-ADJ/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 technologies, with decades of LDO design expertise and broad automotive/industrial qualification.
The LP3874 series was developed for high-efficiency, low-noise linear regulation in space-constrained digital systems - targeting microprocessor, DSP, and memory interface power where ultra-low dropout and fast transient response are essential.
FAQ
What is the minimum input voltage required for LP3874EMPX-ADJ/NOPB to regulate at 1.8V output?
The minimum input voltage is the greater of [VOUT(NOM) + VDROPOUT] or 2.5V. For 1.8V output, dropout is 240mV at 0.8A, so minimum VIN = 1.8V + 0.24V = 2.04V - but per datasheet Section "Recommended Operating Conditions", the absolute minimum VIN is 2.5V. Therefore, LP3874EMPX-ADJ/NOPB requires ≥2.5V input even for 1.8V output.
Can LP3874EMPX-ADJ/NOPB be used with ceramic output capacitors instead of tantalum?
No - the LP3874EMPX-ADJ/NOPB is not stable with ceramic-only output capacitors. Datasheet Figure 16 defines a stable ESR region that ceramic capacitors (typically <10mΩ) fall outside of. Tantalum is explicitly recommended; if ceramics are used, they must be paralleled with a resistor to raise effective ESR into the stable zone, or a different LDO (e.g., TPS7A20) should be selected.
What is the purpose of the CFF capacitor in the LP3874EMPX-ADJ/NOPB application circuit?
The CFF (feed-forward) capacitor adds phase lead to the control loop, improving stability and transient response. Its value is calculated using Fz ≈ 45kHz = 1/(2π × R1 × CFF). For example, with R1 = 100kΩ, CFF ≈ 35pF. It must be a high-quality X5R/X7R ceramic capacitor placed close to the ADJ pin, as specified in the Application Hints section of the LP3874EMPX-ADJ/NOPB datasheet.
How does the shutdown function behave when the SD pin is left floating on LP3874EMPX-ADJ/NOPB?
The SD pin has no internal pull-up or pull-down; if left floating, its voltage is indeterminate and may cause erratic on/off cycling or partial turn-on. Datasheet Section "Shutdown Operation" mandates active termination: either a 10kΩ pull-up to VIN or direct drive from a CMOS rail-to-rail source. Leaving SD unconnected violates recommended operation and risks unstable regulation or excessive ground current in LP3874EMPX-ADJ/NOPB.
Is LP3874EMPX-ADJ/NOPB compatible with lead-free reflow processes?
Yes - LP3874EMPX-ADJ/NOPB carries "Level-1-260°C-UNLIM" MSL rating per TI's PACKAGE OPTION ADDENDUM, confirming full compatibility with standard lead-free reflow profiles (peak 260°C, ≤60 sec above 220°C). The "NOPB" suffix denotes lead-free finish (Sn), and the SOT-223 package is qualified for Pb-free assembly without special handling.
LP3874EMPX-ADJ/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:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 7V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 6.6V
- 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
LP3874EMPX-ADJ/NOPB FAQ
1.How can I place an order for LP3874EMPX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3874EMPX-ADJ/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 LP3874EMPX-ADJ/NOPB reliable?
The price and inventory of LP3874EMPX-ADJ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3874EMPX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LP3874EMPX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3874EMPX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3874EMPX-ADJ/NOPB?
LP3874EMPX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3874EMPX-ADJ/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 LP3874EMPX-ADJ/NOPB?
For technical support, including LP3874EMPX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3874EMPX-ADJ/NOPB requirements.
6.How does Aetrix verify that LP3874EMPX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3874EMPX-ADJ/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 LP3874EMPX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LP3874EMPX-ADJ/NOPB?
All LP3874EMPX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3874EMPX-ADJ/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 LP3874EMPX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LP3874EMPX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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