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Texas Instruments LP38692MPX-3.3
- Part No.:
- LP38692MPX-3.3
- Manufacturer:
- Texas Instruments
- Package:
- TO-261-5, TO-261AB
- Datasheet:
-
LP38692MPX-3.3.pdf
- Description:
- IC REG LINEAR 3.3V 1A SOT223-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,284
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Product details
Overview
LP38692MPX-3.3 from Texas Instruments is a 3.3 V, 1-A low-dropout CMOS linear regulator with enable control, stable using 1-µF ceramic output capacitors, 2.5% output accuracy at 25°C, 650 mV dropout at 1 A (VOUT = 3.3 V), and thermal shutdown protection - deployed in notebook computers and battery-powered instrumentation.
For engineers reviewing the LP38692MPX-3.3 datasheet, LP38692MPX-3.3 pinout, LP38692MPX-3.3 application, or LP38692MPX-3.3 equivalent, key selection criteria include dropout voltage at full load, enable threshold behavior across temperature, ground pin current under load, remote sense capability (WSON only), and thermal derating in SOT-223 packaging.
Technical Context
The LP38692MPX-3.3 uses a PMOS pass transistor to eliminate DC base drive current, enabling ground pin current of just 55 µA (typical) at full 1-A load. Its precision trimmed bandgap reference and feedback loop ensure ±2.5% output tolerance over –40°C to 125°C.
It features foldback current limiting dependent on VIN–VOUT differential (450 mA limit at >5 V drop; 1500 mA at <4 V), thermal shutdown activation at 160°C with 10°C hysteresis, and no internal pull-up/pull-down on the EN pin - requiring external termination for reliable enable/disable control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±2.5% at 25°C; maintains regulation across –40°C to 125°C |
| Max Output Current | 1 A continuous; limited by thermal resistance (RθJA = 68.5°C/W in SOT-223) |
| Dropout Voltage | 650 mV at 1 A load (VOUT = 3.3 V); defines minimum VIN = 3.95 V for full-load regulation |
| Quiescent Current | 55 µA typical at full load; rises to 100 µA over full temperature range |
| Enable Threshold | VEN(ON) ≥ 1.8 V at VIN = 4 V; VEN(OFF) ≤ 0.4 V - no hysteresis |
| PSRR | 55 dB at 120 Hz (1 Vp-p ripple); critical for noise-sensitive analog/digital mixed-signal rails |
| Output Noise | 0.7 µV/√Hz (10 Hz–10 kHz bandwidth); enables clean power for ADCs and RF front-ends |
Pinout & Package
The LP38692MPX-3.3 is supplied in a 5-pin SOT-223 package (6.50 mm × 3.56 mm body), with exposed thermal pad connected internally to GND. Pin 1 = IN, Pin 2 = GND, Pin 3 = OUT, Pin 4 = SNS (not connected in SOT-223), Pin 5 = EN.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 1) | Input supply connection | Accepts 2.7–10 V; must be decoupled with ≥1 µF ceramic capacitor near pin |
| GND (Pin 2) | Circuit and thermal ground | Internally tied to exposed pad; requires soldered copper pour for thermal performance |
| OUT (Pin 3) | Regulated output | Delivers 3.3 V at up to 1 A; stable with 1 µF ceramic output capacitor |
| EN (Pin 5) | Enable control input | Active-high logic; must be externally pulled to IN or controlled signal - no internal bias |
Key Features
| Feature | Design Value |
|---|---|
| PMOS Pass Transistor | Eliminates base drive current → ground pin current stays ≤100 µA across load, input, and temperature |
| Ceramic-Capacitor Stability | Stable with 1-µF output capacitor (ESR 5–500 mΩ); reduces BOM count vs. tantalum/aluminum alternatives |
| Remote Sense Support | SNS pin available in WSON variant only; not present in SOT-223 (LP38692MPX-3.3); omitted from pinout |
| Foldback Current Limit | Adaptive current limit: 450 mA at high VIN–VOUT (>5 V), 1500 mA at low differential (<4 V) |
| Thermal Shutdown | Activates at 160°C junction temp; recovers at ~150°C - protects against sustained overload or poor heatsinking |
Applications
| Hard Disk Drive Power Rail | Notebook System Core Logic |
|---|---|
Use Scenario: Supplies 3.3 V to HDD servo controller ICs requiring tight voltage tolerance and fast transient response during head seek operations. IC Role / Device Role / Timing Role: Primary LDO for digital core logic; regulates from 5 V or 12 V intermediate rail. Use Value: 650 mV dropout enables operation from aging or undersized intermediate supplies; 0.7 µV/√Hz noise prevents data corruption in high-speed serial interfaces. | Use Scenario: Powers DDR memory termination (VTT) or chipset I/O rails in space-constrained notebook designs. IC Role / Device Role / Timing Role: Point-of-load regulator with enable control for dynamic power gating during sleep states. Use Value: 1-µA off-state quiescent current extends battery life; SOT-223 footprint allows placement near load with minimal trace inductance. |
| Battery-Powered Portable Instrumentation | Industrial Sensor Signal Chain |
Use Scenario: Powers microcontroller, ADC, and op-amp stages in handheld multimeters or gas analyzers operating from single-cell Li-ion (3.0–4.2 V). IC Role / Device Role / Timing Role: Main system regulator delivering clean 3.3 V to mixed-signal subsystems. Use Value: Stable with 1-µF ceramic output cap simplifies layout in compact enclosures; ±2.5% accuracy ensures measurement repeatability without calibration drift. | Use Scenario: Supplies precision analog front-end (AFE) in programmable logic controller (PLC) analog input modules. IC Role / Device Role / Timing Role: Low-noise post-regulator for reference buffers and signal conditioning amplifiers. Use Value: 55 dB PSRR at 120 Hz rejects line-frequency interference; thermal shutdown prevents field failure in sealed enclosures with limited airflow. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLS850B0ELVSE | Automotive-grade AEC-Q100 qualified; 500 mA max output; integrated reset and watchdog functions | Designed for automotive body electronics; includes fail-safe monitoring not present in LP38692MPX-3.3 | Select when functional safety (ASIL-B) or system monitoring is required; not drop-in due to higher integration and lower current rating |
| MCP1826T-3302E/DB | 3.3 V fixed, 1.5 A rated; 300 mV dropout at 1.5 A; 65 µA quiescent current; SOT-223-3 package (no EN pin) | Lacks enable control and thermal shutdown hysteresis; optimized for cost-sensitive industrial use | Choose for higher current margin and lower dropout where enable functionality is unnecessary and thermal cycling risk is managed externally |
Compared with TLS850B0ELVSE and MCP1826T-3302E/DB, the LP38692MPX-3.3 uniquely balances 1-A capability, enable control, thermal protection, and ceramic-capacitor stability in a standard SOT-223 footprint - making it optimal for portable and embedded systems where board space, battery life, and reliability are co-constrained.
Availability
LP38692MPX-3.3 is available at Aetrix Electronics and suitable for notebook computers, battery-powered instrumentation, and industrial sensor signal chains requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LP38692MPX-3.3 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 ICs, embedded processors, and connectivity solutions for industrial, automotive, and personal electronics markets.
The LP38692MPX-3.3 belongs to TI's low-dropout linear regulator product line, engineered for portable and battery-operated systems demanding ultra-low quiescent current, ceramic-capacitor compatibility, and robust thermal protection.
FAQ
What is the minimum input voltage required for LP38692MPX-3.3 to regulate 3.3 V at 1 A?
The LP38692MPX-3.3 requires a minimum input voltage of 3.95 V to maintain regulation at 1 A load, based on its 650 mV typical dropout voltage at VOUT = 3.3 V. Below this, output voltage sags; the device also requires VIN ≥ 2.7 V for internal circuitry to power up, but regulation only begins once VIN exceeds VOUT + VDO.
Does LP38692MPX-3.3 support remote voltage sensing?
No - the SNS (sense) pin is only implemented in the WSON package variants of LP38692. The LP38692MPX-3.3 uses the 5-pin SOT-223 package, which does not include the SNS pin. Remote sensing is therefore unavailable for this specific part number; output voltage regulation relies on local feedback at the OUT pin.
What is the recommended EN pin termination for LP38692MPX-3.3 if enable functionality is not used?
If enable control is not required, the EN pin of LP38692MPX-3.3 must be tied directly to the IN pin. TI explicitly states that the EN pin has no internal pull-up or pull-down, so leaving it floating risks undefined operation. Connecting EN to IN ensures always-on behavior while maintaining compatibility with the device's specified enable thresholds.
How does thermal performance differ between LP38692MPX-3.3 and the WSON-packaged LP38692?
The LP38692MPX-3.3 in SOT-223 has RθJA = 68.5°C/W, while the WSON variant has RθJA = 50.6°C/W. This means the SOT-223 version dissipates heat less efficiently into ambient air. For the same power dissipation (e.g., (VIN − 3.3 V) × ILOAD), the SOT-223 junction temperature will rise ~18°C higher than WSON under identical PCB layout conditions - requiring larger copper pours or lower ambient temperatures to avoid thermal shutdown.
Can LP38692MPX-3.3 be used with input voltages below 2.7 V?
No - the LP38692MPX-3.3 is not specified to operate below 2.7 V input. Its internal circuitry, including bandgap reference and error amplifier, requires VIN ≥ 2.7 V to power up and function. At inputs below this threshold, the device may not start, or output voltage may be unregulated and unpredictable. Operation is only guaranteed within the recommended 2.7 V to 10 V range.
LP38692MPX-3.3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-261-5, TO-261AB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 10V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1V @ 1A
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 55 µA
- Current - Supply (Max):
- 100 µA
- PSRR:
- 55dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223-5
LP38692MPX-3.3 FAQ
1.How can I place an order for LP38692MPX-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP38692MPX-3.3 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 LP38692MPX-3.3 reliable?
The price and inventory of LP38692MPX-3.3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP38692MPX-3.3 is usually 5 days.
3.What payment methods are accepted for LP38692MPX-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP38692MPX-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP38692MPX-3.3?
LP38692MPX-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP38692MPX-3.3 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 LP38692MPX-3.3?
For technical support, including LP38692MPX-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP38692MPX-3.3 requirements.
6.How does Aetrix verify that LP38692MPX-3.3 is sourced from the original manufacturer or authorized distributors?
All LP38692MPX-3.3 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 LP38692MPX-3.3 meets industry standards.
7.What is the process for return or replacement of LP38692MPX-3.3?
All LP38692MPX-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LP38692MPX-3.3, 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 LP38692MPX-3.3 part is unused and in its original packaging.
Return procedure for LP38692MPX-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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