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Texas Instruments LP38692SDX-2.5/NOPB
- Part No.:
- LP38692SDX-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
LP38692SDX-2.5/NOPB.pdf
- Description:
- IC REG LINEAR 2.5V 1A 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,131
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Product details
Overview
LP38692SDX-2.5/NOPB from Texas Instruments is a 2.5 V fixed-output, 1-A low-dropout CMOS linear regulator in a 5-pin SOT-223 package, featuring an enable pin (EN), 450 mV dropout at 1 A (5 VOUT), ±2.5% output accuracy at 25°C, and stable operation with 1-µF ceramic output capacitors. It serves as a precision power supply for core logic rails in portable computing and battery-powered instrumentation.
For engineers reviewing the LP38692SDX-2.5/NOPB datasheet, LP38692SDX-2.5/NOPB pinout, LP38692SDX-2.5/NOPB application, or LP38692SDX-2.5/NOPB equivalent, key selection criteria include dropout voltage at full load, EN pin threshold behavior across temperature, ground current vs. load, thermal shutdown hysteresis, and compatibility with ultra-low-ESR ceramic capacitors without external compensation.
Technical Context
The LP38692SDX-2.5/NOPB uses a PMOS pass transistor to eliminate DC base drive current, enabling ground pin current of only 55 µA (typical) at full load - independent of input voltage or temperature. Its internal trimmed bandgap reference and error amplifier deliver 2.5% output accuracy over –40°C to 125°C, with line regulation of 0.03%/V and load regulation of 1.8 mV across 1 mA–1 A.
It integrates foldback current limiting (450 mA at VIN–VOUT > 5 V; 1500 mA at VIN–VOUT < 4 V), thermal shutdown activation at 160°C with 10°C hysteresis, and operates stably with 1-µF input/output ceramic capacitors - no ESR requirement. The EN pin supports active-high logic control with VEN(MIN) = 1.8 V (VIN = 4 V) and IEN leakage ≤ 1 µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5 V ±2.5% at 25°C; maintains regulation down to –40°C and up to 125°C. |
| Max Output Current | 1 A continuous; limited by thermal resistance (RθJA = 68.5°C/W for SOT-223) and ambient conditions. |
| Dropout Voltage | 450 mV typical at 1 A, VOUT = 5 V; 800 mV max at 1 A, VOUT = 2.5 V, –40°C to 125°C. |
| Quiescent Current | 55 µA typical at full load; drops to 1 µA in shutdown (VEN ≤ 0.4 V). |
| Enable Threshold | VEN(ON) = 1.8 V min (VIN = 4 V); VEN(OFF) = 0.4 V max; no internal pull-up/pull-down. |
| PSRR | 55 dB at 120 Hz (1 Vp-p ripple, VIN = VOUT + 2 V); enables clean power for noise-sensitive analog/digital loads. |
| Thermal Shutdown | Activates at 160°C junction temperature; recovers at ~150°C; protects against sustained overload. |
Pinout & Package
The LP38692SDX-2.5/NOPB is housed in a RoHS-compliant 5-pin SOT-223 package (6.50 mm × 3.56 mm body, exposed thermal pad). Pin 1 is IN, Pin 2 is GND, Pin 3 is OUT, Pin 4 is SNS (sense), and Pin 5 is EN. The exposed pad (DAP) must be soldered to a PCB copper plane for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input supply connection | Accepts 2.7–10 V; both IN pins required for WSON, but SOT-223 has single IN pin. |
| 2 (GND) | Circuit ground reference | Thermally connected to die; must be tied to large copper area for heat dissipation. |
| 3 (OUT) | Regulated output | Delivers stable 2.5 V; connects directly to load and output capacitor. |
| 4 (SNS) | Remote output sense | Must be tied to VOUT trace near load to compensate for PCB trace IR drop; WSON-only feature, but present on SOT-223 variant per datasheet pin diagram. |
| 5 (EN) | Enable control input | Active-high logic; drives regulator ON when ≥1.8 V (VIN = 4 V); pulls output to high-Z when ≤0.4 V. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ground current | 55 µA typical at 1 A load - enables high-efficiency operation in battery-critical systems without sacrificing regulation accuracy. |
| Ceramic-capacitor stability | Stable with 1-µF ceramic COUT; eliminates need for tantalum or aluminum electrolytics and associated ESR constraints. |
| Enable-controlled shutdown | Reduces quiescent current to 1 µA; allows precise system-level power sequencing and deep-sleep mode entry. |
| Integrated thermal protection | 160°C shutdown with 10°C hysteresis prevents permanent damage during transient overloads or poor heatsinking. |
| Foldback current limiting | Adapts current limit based on VIN–VOUT differential - 450 mA at high differential, 1500 mA at low differential - improving short-circuit survivability. |
Applications
| Hard Disk Drive Power Rail | Notebook CPU Core Supply |
|---|---|
Use Scenario: Powers 2.5 V logic interface circuitry in 2.5-inch HDD controllers where space and thermal headroom are constrained. IC Role / Device Role / Timing Role: Primary LDO delivering regulated 2.5 V to SATA PHY and buffer memory, with fast transient response to burst data transfers. Use Value: 450 mV dropout ensures regulation even as battery voltage sags to 2.95 V; 1-µF ceramic compatibility reduces BOM count and board area. | Use Scenario: Supplies 2.5 V to embedded controller (EC) or keyboard controller in ultraportable notebooks operating from single-cell Li-ion (2.7–4.2 V). IC Role / Device Role / Timing Role: Standby rail regulator enabled only during keyboard wake events, minimizing quiescent drain. Use Value: 1 µA shutdown current extends battery shelf life; ±2.5% accuracy guarantees reliable EC reset behavior across temperature. |
| Battery-Powered Medical Sensor | Portable Test Equipment Bias Rail |
Use Scenario: Provides clean 2.5 V reference and analog front-end bias for handheld ECG or pulse oximeter modules. IC Role / Device Role / Timing Role: Low-noise (0.7 µV/√Hz) analog supply decoupled from noisy digital domains via EN-controlled isolation. Use Value: PSRR of 55 dB at 120 Hz suppresses AC mains coupling; thermal shutdown prevents overheating in sealed enclosures. | Use Scenario: Generates stable 2.5 V for ADC reference and op-amp bias in handheld multimeters and signal analyzers. IC Role / Device Role / Timing Role: Precision voltage source with remote sensing (SNS pin) compensating for trace resistance between regulator and ADC input. Use Value: SNS connection maintains ±2.5% output accuracy at load point despite 100-mΩ PCB trace resistance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TSS721AIDR | Fixed 2.5 V output, 150 mA max, SOIC-8; no enable pin; higher dropout (600 mV @ 150 mA). | Suitable only for low-current sensor biasing; cannot replace LP38692SDX-2.5/NOPB in 1-A loads. | Select only if load current ≤150 mA and enable functionality is unnecessary. |
| TPS7A2025PDQNR | 2.5 V fixed, 300 mA, X2SON-4; 1.6-V min input; 165 mV dropout @ 300 mA; 6.5-µA IQ. | Lower current rating and no SNS pin; optimized for ultra-low-IQ wearables, not 1-A industrial loads. | Use only in space-constrained, sub-300 mA applications where 165 mV dropout is critical and remote sensing is not required. |
Compared with TSS721AIDR and TPS7A2025PDQNR, LP38692SDX-2.5/NOPB uniquely delivers 1-A capability with enable control, remote sensing, and ceramic-stable operation in SOT-223 - making it irreplaceable for high-current, thermally demanding portable systems requiring precision and flexibility.
Availability
LP38692SDX-2.5/NOPB is available at Aetrix Electronics and suitable for hard disk drives, notebook computers, and battery-powered medical instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for LP38692SDX-2.5/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 designing analog ICs, embedded processors, and connectivity solutions for industrial, automotive, and personal electronics markets.
The LP38692 series belongs to TI's precision low-dropout linear regulator product line, engineered specifically for battery-powered portable systems needing high accuracy, ultra-low ground current, and ceramic-capacitor compatibility without external compensation.
FAQ
What is the minimum input voltage required for LP38692SDX-2.5/NOPB to regulate 2.5 V output?
The LP38692SDX-2.5/NOPB requires VIN ≥ (VOUT + VDO) or 2.7 V, whichever is higher. With a typical dropout of 450 mV at 1 A, minimum VIN is 2.95 V under full load. At light load (100 µA), dropout drops to 80 mV, allowing regulation down to 2.58 V - but the device's absolute minimum operating input is 2.7 V per recommended conditions.
Does LP38692SDX-2.5/NOPB require an external capacitor on the SNS pin?
No - the SNS pin on LP38692SDX-2.5/NOPB must be connected directly to the VOUT trace at the load point (not to a capacitor). It is a high-impedance sense input; adding capacitance degrades transient response and may cause instability. The pin enables remote voltage sensing to cancel PCB trace IR drop, improving load regulation accuracy.
Can LP38692SDX-2.5/NOPB operate with a 1-µF output capacitor only, or is additional capacitance needed?
Yes - LP38692SDX-2.5/NOPB is explicitly characterized and guaranteed stable with a single 1-µF ceramic output capacitor (X5R/X7R, ≤500 mΩ ESR). No additional bulk capacitance is required for stability, though larger values (e.g., 10 µF) may improve transient response in high-dI/dt applications.
What happens to LP38692SDX-2.5/NOPB output during thermal shutdown?
When junction temperature reaches ~160°C, LP38692SDX-2.5/NOPB disables its output pass transistor, forcing VOUT to fall toward 0 V. Output remains disabled until junction cools to ~150°C, at which point regulation resumes automatically. This cycling protects the device but indicates inadequate heatsinking or excessive power dissipation in the application.
Is the EN pin of LP38692SDX-2.5/NOPB internally pulled up or down?
No - the EN pin of LP38692SDX-2.5/NOPB has no internal pull-up or pull-down resistor. It must be actively driven or passively terminated (e.g., to IN via resistor) to avoid floating states. Leaving EN unconnected risks unpredictable enable/disable behavior and potential shoot-through or latch-up during power-up.
LP38692SDX-2.5/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 6-WDFN Exposed Pad
- 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):
- 2.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.3V @ 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:
- 6-WSON (3x3)
LP38692SDX-2.5/NOPB FAQ
1.How can I place an order for LP38692SDX-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP38692SDX-2.5/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 LP38692SDX-2.5/NOPB reliable?
The price and inventory of LP38692SDX-2.5/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP38692SDX-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LP38692SDX-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP38692SDX-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP38692SDX-2.5/NOPB?
LP38692SDX-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP38692SDX-2.5/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 LP38692SDX-2.5/NOPB?
For technical support, including LP38692SDX-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP38692SDX-2.5/NOPB requirements.
6.How does Aetrix verify that LP38692SDX-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LP38692SDX-2.5/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 LP38692SDX-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LP38692SDX-2.5/NOPB?
All LP38692SDX-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP38692SDX-2.5/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 LP38692SDX-2.5/NOPB part is unused and in its original packaging.
Return procedure for LP38692SDX-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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