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Texas Instruments LP38693MPX-2.5/NOPB
- Part No.:
- LP38693MPX-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-261-5, TO-261AB
- Datasheet:
-
LP38693MPX-2.5/NOPB.pdf
- Description:
- IC REG LIN 2.5V 500MA SOT223-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,758
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Product details
Overview
LP38693MPX-2.5/NOPB from Texas Instruments is a 500-mA, 2.5-V fixed-output CMOS low-dropout linear regulator featuring PMOS pass transistor architecture, 250 mV dropout at 500 mA (VOUT = 5 V), ±2% output accuracy over –40°C to 125°C, and stable operation with only 1-µF ceramic output capacitance. It delivers precision voltage regulation for battery-powered microcontroller cores in portable instrumentation.
For engineers reviewing the LP38693MPX-2.5/NOPB datasheet, LP38693MPX-2.5/NOPB pinout, LP38693MPX-2.5/NOPB application, or LP38693MPX-2.5/NOPB equivalent, key selection criteria include enable-controlled power sequencing, thermal shutdown behavior at 160°C, foldback current limiting thresholds dependent on VIN–VOUT differential, and WSON-6 package thermal performance (RθJB = 24.9°C/W).
Technical Context
The LP38693MPX-2.5/NOPB uses a PMOS pass transistor enabling ultra-low ground pin current (55 µA typical at full load) independent of input voltage or temperature. Its trimmed bandgap reference and feedback loop ensure 2% output accuracy across –40°C to 125°C, with line regulation of 0.03%/V and load regulation of 1.8%/A at 25°C.
Functional modes are controlled via the EN pin: logic-high (>3 V at VIN = 6 V) enables regulation; logic-low (<0.4 V) disables output and reduces quiescent current to 1 µA. The SNS pin-exclusive to WSON packages-supports remote sensing to compensate for PCB trace IR drop, requiring direct connection to OUT unless precision load-side regulation is needed.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5 V ±2% (ensured over –40°C to 125°C; supports tight-tolerance analog rails) |
| Max Output Current | 500 mA (full-load capability maintained up to 125°C junction temp with proper PCB copper area) |
| Dropout Voltage | 250 mV typical at 500 mA, VOUT = 5 V (enables high-efficiency operation even at low VIN–VOUT margins) |
| Quiescent Current | 100 µA typical (55 µA at full load; enables long battery life in always-on subsystems) |
| Enable Threshold | VEN(ON) = 3 V min at VIN = 6 V (compatible with 3.3-V GPIO; no internal pullup requires external bias) |
| Thermal Shutdown | Activates at 160°C junction temp with 10°C hysteresis (protects against sustained overload without PCB-level heatsinking) |
| PSRR | 55 dB at 120 Hz (rejects AC ripple from switching pre-regulators feeding VIN) |
Pinout & Package
LP38693MPX-2.5/NOPB uses the NGG (WSON-6) package: 3.00 mm × 3.00 mm body with exposed thermal pad (DAP) soldered to PCB ground plane for optimal thermal performance (RθJB = 24.9°C/W). Pin 1 is IN, Pin 2 is GND, Pin 3 is EN, Pin 4 is OUT, Pin 5 is SNS, Pin 6 is IN (dual IN pins must be tied together).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pins 1, 6) | Input supply connection | Dual IN pins share 500-mA max total current; both must be connected to VIN for full rating |
| GND (Pin 2) | Power and signal reference | Primary ground return; connects to DAP for thermal conduction to PCB copper |
| EN (Pin 3) | Enable control input | Active-high logic input; drives regulator ON/OFF; no internal pullup requires external termination |
| OUT (Pin 4) | Regulated output | Delivers 2.5 V ±2% to load; connects to SNS for remote sensing or directly to load |
| SNS (Pin 5) | Remote sense input | Connects to load-side VOUT to cancel PCB trace resistance error; must tie to OUT if unused |
| DAP (Exposed Pad) | Thermal and electrical ground | Soldered to PCB ground plane; critical for achieving RθJB = 24.9°C/W and thermal shutdown margin |
Key Features
| Feature | Design Value |
|---|---|
| Stable with 1-µF ceramic output capacitor | Eliminates need for large tantalum or electrolytic capacitors, reducing board area and cost in space-constrained designs |
| PMOS pass transistor architecture | Maintains ground pin current ≤100 µA across full load, input voltage, and temperature range-critical for battery runtime |
| Foldback current limiting | Reduces output current to ~350 mA when VIN–VOUT > 5 V, preventing thermal runaway during high-differential startup |
| 1-µA off-state quiescent current | Enables true zero-power shutdown mode for systems requiring ultra-low standby leakage (e.g., medical sensors) |
| –40°C to 125°C guaranteed operation | Validated performance across industrial and automotive under-hood temperature ranges without derating |
Applications
| Portable Instrumentation | Battery-Powered Microcontrollers |
|---|---|
Use Scenario: Handheld multimeter with 16-bit ADC and LCD display powered by two AA cells. IC Role / Device Role / Timing Role: Primary 2.5-V analog rail regulator for precision reference and signal conditioning circuitry. Use Value: 2% output tolerance ensures ADC full-scale accuracy; 1-µF ceramic stability minimizes BOM count in compact enclosure. |
Use Scenario: Low-power IoT node using MSP430 MCU with sleep currents <1 µA. IC Role / Device Role / Timing Role: Always-on 2.5-V supply for RTC and wake-up controller, enabled only during active cycles. Use Value: 1-µA off-state IQ preserves battery life; EN pin allows precise power gating synchronized with MCU sleep states. |
| Notebook Subsystem Regulation | Industrial Sensor Signal Chain |
Use Scenario: USB-C powered portable SSD with NVMe controller requiring clean 2.5-V I/O supply. IC Role / Device Role / Timing Role: Post-regulator cleaning switcher output noise before feeding NAND flash interface. Use Value: 55 dB PSRR at 120 Hz suppresses switching ripple; SNS pin compensates for flex-cable voltage drop. |
Use Scenario: 4–20 mA loop-powered temperature transmitter with isolated 2.5-V sensor excitation. IC Role / Device Role / Timing Role: Local 2.5-V reference supply for precision RTD-to-digital converter (e.g., ADS1220). Use Value: ±2% accuracy over –40°C to 125°C ensures calibration stability; thermal shutdown protects against ambient overtemperature faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLS850F0TESK | Automotive-grade 500-mA LDO with integrated watchdog timer and reset generator; 3.3-V fixed output only | Requires external level-shifting for 2.5-V loads; adds system-level fault monitoring not present in LP38693MPX-2.5/NOPB | Select when ASIL-B functional safety compliance and reset supervision are required alongside regulation |
| TPS7A2025PDQNR | Ultra-low-noise (0.7 µV/√Hz) 300-mA LDO with 1.6-V to 6.0-V input; 2.5-V fixed output; 160-mV dropout at 300 mA | Lower max current and higher dropout limit continuous 500-mA operation at low VIN–VOUT differentials | Select when sub-1-µV/√Hz noise is critical for RF or high-resolution ADC front-ends, accepting reduced current headroom |
Compared with TLS850F0TESK and TPS7A2025PDQNR, LP38693MPX-2.5/NOPB provides the highest continuous current (500 mA) at lowest dropout (250 mV) in a WSON-6 package, making it optimal for thermally constrained 2.5-V rails where noise and safety features are secondary to power delivery density.
Availability
LP38693MPX-2.5/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered microcontrollers, and industrial sensor signal chains requiring stable component supply with guaranteed long-term manufacturability.
Supply support for LP38693MPX-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 company designing analog ICs, embedded processors, and digital signal processors for industrial, automotive, and consumer applications.
LP38693MPX-2.5/NOPB belongs to the LP3869x family of low-dropout CMOS linear regulators engineered for portable, battery-powered digital systems requiring fast start-up, tight output tolerance, and ceramic-capacitor stability without external compensation.
FAQ
What is the minimum input voltage required for LP38693MPX-2.5/NOPB to regulate 2.5 V output?
The LP38693MPX-2.5/NOPB requires VIN ≥ (VOUT + VDO) = 2.5 V + 0.25 V = 2.75 V minimum under 500-mA load to maintain regulation. Per datasheet Section 7.4, the absolute minimum operating VIN is 2.7 V, but regulation is only ensured above the dropout threshold. Below 2.75 V, output voltage drops linearly with VIN.
Can LP38693MPX-2.5/NOPB operate without the SNS pin connected?
Yes, LP38693MPX-2.5/NOPB operates normally with SNS pin tied directly to OUT. The SNS pin is optional for remote sensing; if unused, connecting it to OUT maintains standard regulation accuracy. Leaving SNS floating is prohibited and may cause instability or incorrect regulation.
Does LP38693MPX-2.5/NOPB require an input capacitor?
Yes, LP38693MPX-2.5/NOPB requires a minimum 1-µF ceramic input capacitor between IN and GND, placed within 1 cm of the IN pin and connected to a clean analog ground. This capacitor stabilizes the input supply and prevents oscillation during load transients, as specified in Section 9.2.2.3 of the datasheet.
What is the thermal shutdown behavior of LP38693MPX-2.5/NOPB?
LP38693MPX-2.5/NOPB activates thermal shutdown at 160°C junction temperature and resumes regulation at ~150°C (10°C hysteresis). During shutdown cycling, the device limits power dissipation to prevent damage but degrades reliability if sustained-proper PCB copper area (DAP soldering) is required to avoid repeated tripping under 500-mA load at high ambient temperatures.
Is LP38693MPX-2.5/NOPB compatible with 1.8-V logic-level enable signals?
No, LP38693MPX-2.5/NOPB requires VEN ≥ 3.0 V (min at VIN = 6 V) to guarantee full enablement across temperature and process variation. A 1.8-V GPIO cannot reliably drive EN high; a level shifter or pullup to VIN is required. The EN pin has no internal pullup, so passive termination is mandatory.
LP38693MPX-2.5/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):
- 10V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.73V @ 500mA
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 55 µA
- Current - Supply (Max):
- 100 µA
- PSRR:
- 55dB (120Hz)
- Control Features:
- Enable
- Protection Features:
- Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223-5
LP38693MPX-2.5/NOPB FAQ
1.How can I place an order for LP38693MPX-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP38693MPX-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 LP38693MPX-2.5/NOPB reliable?
The price and inventory of LP38693MPX-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 LP38693MPX-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LP38693MPX-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP38693MPX-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP38693MPX-2.5/NOPB?
LP38693MPX-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP38693MPX-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 LP38693MPX-2.5/NOPB?
For technical support, including LP38693MPX-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP38693MPX-2.5/NOPB requirements.
6.How does Aetrix verify that LP38693MPX-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LP38693MPX-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 LP38693MPX-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LP38693MPX-2.5/NOPB?
All LP38693MPX-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP38693MPX-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 LP38693MPX-2.5/NOPB part is unused and in its original packaging.
Return procedure for LP38693MPX-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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