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Texas Instruments LP38693QSD-2.5/NOPB
- Part No.:
- LP38693QSD-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
LP38693QSD-2.5/NOPB.pdf
- Description:
- IC REG LINEAR 2.5V 500MA 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:305
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Product details
Overview
LP38693QSD-2.5/NOPB from Texas Instruments is a 500-mA, 2.5-V fixed-output CMOS low-dropout linear regulator in a 6-pin WSON package with exposed thermal pad. It features 250 mV dropout at 500 mA (VOUT = 5 V), ±2% output accuracy over –40°C to 125°C, 1-µA shutdown quiescent current, and remote sense (SNS) capability for precision load regulation. It powers core logic rails in portable instrumentation requiring stable, low-noise 2.5-V supply.
For engineers reviewing the LP38693QSD-2.5/NOPB datasheet, LP38693QSD-2.5/NOPB pinout, LP38693QSD-2.5/NOPB application, or LP38693QSD-2.5/NOPB equivalent, key selection considerations include dropout voltage at full load, thermal performance in compact layouts, enable threshold behavior across temperature, SNS pin routing requirements, and ceramic capacitor stability with 1-µF minimum COUT.
Technical Context
The LP38693QSD-2.5/NOPB uses a PMOS pass transistor architecture enabling ultra-low ground pin current (55 µA typical at full load) independent of input voltage or temperature. Its internal trimmed bandgap reference and error amplifier deliver tight DC regulation and fast transient response without requiring external compensation.
It integrates foldback current limiting (350 mA at VIN–VOUT > 5 V; 850 mA at VIN–VOUT < 4 V), thermal shutdown activation at 160°C with 10°C hysteresis, and reverse-voltage protection via inherent PFET body diode-requiring external Schottky clamping only in dual-supply systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5 V ±2% over –40°C to 125°C - ensures stable core logic supply without external feedback network. |
| Max Output Current | 500 mA - supports moderate-power microcontrollers and analog front-ends in space-constrained designs. |
| Dropout Voltage | 250 mV at 500 mA (VOUT = 5 V); 45 mV at 500 mA (VOUT = 2.5 V) - enables operation from single-cell Li-ion or 3.3-V rails with minimal headroom loss. |
| Quiescent Current | 100 µA typical (active), 1 µA max (shutdown) - extends battery life in always-on sensor nodes. |
| PSRR | 55 dB at 120 Hz - suppresses ripple from switching pre-regulators feeding sensitive ADCs or RF circuitry. |
| Thermal Resistance | RθJA = 50.6°C/W (WSON-6) - requires ≥150 mm² copper pour under DAP for full 500-mA operation at 85°C ambient. |
| Enable Threshold | VEN(MIN) = 3 V (VIN = 6 V), VEN(MAX) = 0.4 V - supports direct connection to 3.3-V GPIO or RC delay networks for power sequencing. |
Pinout & Package
The LP38693QSD-2.5/NOPB is housed in a 3.0 mm × 3.0 mm, 6-pin WSON package with an exposed thermal pad (DAP) on the bottom surface. The DAP must be soldered to a PCB copper plane for thermal conduction and electrical grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Main input supply connection | Must be tied to Pin 6 (second IN) for full 500-mA capability; accepts 2.7–10 V; decoupled with 1-µF ceramic capacitor. |
| 2 (GND) | Analog and power ground reference | Low-impedance return path for control circuitry; connects internally to DAP for thermal conduction. |
| 3 (EN) | Active-high enable control | Pulled high to enable output; pulled low (<0.4 V) to disable regulator and reduce IQ to ≤1 µA; no internal pullup/pulldown. |
| 4 (OUT) | Regulated output voltage | Delivers 2.5 V ±2%; requires 1-µF ceramic capacitor to GND for stability; remote sensing enabled via SNS pin. |
| 5 (SNS) | Remote output voltage sense | Must be connected directly to load-side OUT trace to compensate for PCB trace IR drop; not used if local regulation suffices. |
| 6 (IN) | Secondary input supply connection | Electrically identical to Pin 1; both IN pins must be shorted externally to support full rated current and minimize bond-wire resistance. |
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 portable designs. |
| PMOS pass transistor architecture | Maintains ground pin current ≤55 µA at full load, independent of input voltage or temperature-simplifying power budgeting. |
| Remote sense (SNS) pin | Compensates for up to 100 mΩ PCB trace resistance between regulator and load, preserving ±2% output accuracy at point-of-load. |
| Foldback current limiting | Reduces short-circuit current to 350 mA when VIN–VOUT > 5 V, lowering power dissipation during fault conditions. |
| Thermal shutdown with hysteresis | Shuts down at 160°C junction temperature and re-enables at ~150°C-prevents thermal runaway while allowing safe recovery. |
Applications
| Portable Instrumentation | Battery-Powered Microcontroller Systems |
|---|---|
|
Use Scenario: Handheld multimeter with 16-bit SAR ADC and LCD display powered from two AA cells. IC Role / Device Role / Timing Role: Primary 2.5-V analog supply rail regulator delivering low-noise, tightly regulated voltage to ADC reference and signal chain. Use Value: 55 dB PSRR at 120 Hz rejects ripple from boost converter powering digital subsystem; ±2% tolerance ensures measurement accuracy across battery discharge curve. |
Use Scenario: Wireless sensor node using ARM Cortex-M0+ MCU, BLE radio, and environmental sensors. IC Role / Device Role / Timing Role: Core logic voltage regulator enabling low-power sleep modes and fast wake-up with stable 2.5-V supply. Use Value: 1-µA shutdown current extends shelf life; 250-mV dropout allows operation down to 2.75-V battery voltage; EN pin enables precise power sequencing with host MCU. |
| Hard Disk Drive Servo Control | Notebook Computer I/O Interface Rails |
|
Use Scenario: Precision voice-coil motor driver IC requiring clean 2.5-V bias for DAC and op-amps in HDD actuator assembly. IC Role / Device Role / Timing Role: Low-noise auxiliary supply regulator with remote sensing to maintain voltage accuracy at motor driver IC pins. Use Value: SNS pin compensates for 50-mΩ flex cable resistance; 0.7 µV/√Hz output noise prevents servo position jitter; thermal pad ensures reliability under continuous 400-mA load. |
Use Scenario: USB 3.0 PHY and PCIe Gen2 interface logic requiring stable 2.5-V supply in ultrabook motherboard. IC Role / Device Role / Timing Role: Point-of-load regulator placed near high-speed interface ICs to minimize supply impedance and EMI. Use Value: 1-µF ceramic stability enables placement within 3 mm of load; WSON package footprint (3×3 mm) fits dense routing; 50.6°C/W RθJA supports 500-mA peak currents during link training. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLS850F2BTTA1 | Automotive-grade (AEC-Q100 Grade 1), 500-mA, 2.5-V fixed, but requires 2.2-µF min COUT; higher 300-mV dropout at 500 mA. | Qualified for under-hood automotive use; includes watchdog and reset functions not present in LP38693QSD-2.5/NOPB. | Select for automotive safety-critical systems needing extended temperature range (–40°C to 150°C) and functional safety features. |
| TPS7A2025PDQNR | Lower 165-mV dropout at 500 mA, 65-dB PSRR at 1 kHz, but no SNS pin; requires 0.22-µF min COUT; smaller 1.5-mm × 1.5-mm DQN package. | Optimized for ultra-low-noise, high-PSRR applications like RF receivers; lacks remote sensing for precision load regulation. | Select when board space is critical and remote sensing is unnecessary; preferred for noise-sensitive RF/analog circuits. |
Compared with TLS850F2BTTA1 and TPS7A2025PDQNR, the LP38693QSD-2.5/NOPB uniquely balances remote sensing capability, 1-µF ceramic stability, and industrial temperature grade in a thermally robust WSON package-making it optimal for portable instrumentation where load regulation accuracy and layout flexibility are prioritized over automotive qualification or ultra-low-noise performance.
Availability
LP38693QSD-2.5/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered microcontroller systems, hard disk drive servo control, and notebook computer I/O interface rails requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LP38693QSD-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 system solutions for industrial, automotive, and personal electronics markets.
The LP38693QSD-2.5/NOPB belongs to TI's LP3869x family of low-dropout CMOS linear regulators, engineered specifically for portable, battery-powered digital systems demanding fast start-up, tight output tolerance, and ceramic-capacitor stability in compact WSON packages.
FAQ
What is the minimum input voltage required for LP38693QSD-2.5/NOPB to regulate 2.5 V output?
The LP38693QSD-2.5/NOPB requires VIN ≥ (VOUT + VDO), where VDO is the dropout voltage. At 500 mA and 25°C, VDO is 45 mV, so minimum VIN is 2.545 V. However, per datasheet Section 7.4, the absolute minimum operating VIN is 2.7 V to ensure full functionality of internal circuitry-thus 2.7 V is the practical lower limit regardless of load current.
Can the SNS pin of LP38693QSD-2.5/NOPB be left unconnected?
No. The SNS pin must be connected directly to the OUT net at the load point-or tied directly to the OUT pin if remote sensing is not needed. Leaving SNS floating violates the recommended operating conditions and may cause instability or inaccurate regulation. For local regulation only, connect SNS to OUT with a short, low-inductance trace.
Does LP38693QSD-2.5/NOPB require an input capacitor, and what value is recommended?
Yes. A minimum 1-µF ceramic capacitor is required between IN and GND for stability, as specified in Section 9.2.2.3. TI recommends placing it within 1 cm of the IN pin and returning it to a clean analog ground. Larger values (e.g., 10 µF) improve transient response and ripple rejection but are not mandatory for basic operation.
How does the foldback current limiting behave during repeated enable cycles of LP38693QSD-2.5/NOPB?
Per Section 8.3.3 CAUTION, foldback current limiting is functional only on the first enable after VIN application. On subsequent EN toggles, foldback is disabled-potentially causing higher inrush current. To ensure consistent current limiting, tie EN directly to IN if enable control is not required, or implement a power-good reset that fully discharges COUT before re-enabling.
Is LP38693QSD-2.5/NOPB compatible with 100% lead-free PCB assembly processes?
Yes. LP38693QSD-2.5/NOPB is RoHS-compliant and qualified for lead-free reflow per JEDEC J-STD-020. Its maximum lead temperature rating is 260°C for 5 seconds, matching standard Pb-free solder profiles. The WSON package's exposed thermal pad must be soldered with appropriate stencil design and paste volume to ensure void-free thermal interface.
LP38693QSD-2.5/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 6-WDFN Exposed Pad
- 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-WSON (3x3)
LP38693QSD-2.5/NOPB FAQ
1.How can I place an order for LP38693QSD-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP38693QSD-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 LP38693QSD-2.5/NOPB reliable?
The price and inventory of LP38693QSD-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 LP38693QSD-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LP38693QSD-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP38693QSD-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP38693QSD-2.5/NOPB?
LP38693QSD-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP38693QSD-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 LP38693QSD-2.5/NOPB?
For technical support, including LP38693QSD-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP38693QSD-2.5/NOPB requirements.
6.How does Aetrix verify that LP38693QSD-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LP38693QSD-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 LP38693QSD-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LP38693QSD-2.5/NOPB?
All LP38693QSD-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP38693QSD-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 LP38693QSD-2.5/NOPB part is unused and in its original packaging.
Return procedure for LP38693QSD-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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