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Texas Instruments LP38693QSDX-2.5/NOPB
- Part No.:
- LP38693QSDX-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
LP38693QSDX-2.5/NOPB.pdf
- Description:
- IC REG LINEAR 2.5V 500MA 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,330
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Product details
Overview
LP38693QSDX-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 enable (EN) and remote sense (SNS) pins. It delivers ±2% output accuracy over –40°C to 125°C, achieves 250 mV dropout at 500 mA (VOUT = 5 V), supports ceramic capacitors as small as 1 µF, and draws only 55 µA ground current at full load - ideal for space-constrained battery-powered instrumentation.
For engineers reviewing the LP38693QSDX-2.5/NOPB datasheet, LP38693QSDX-2.5/NOPB pinout, LP38693QSDX-2.5/NOPB application, or LP38693QSDX-2.5/NOPB equivalent, key selection considerations include its 2.5-V fixed output, EN-controlled on/off sequencing, SNS-enabled remote voltage sensing, thermal shutdown at 160°C, and foldback current limiting optimized for portable systems with variable input-to-output differentials.
Technical Context
The LP38693QSDX-2.5/NOPB uses a PMOS pass transistor architecture, eliminating DC base-drive current and enabling ground pin current ≤100 µA across all load, input voltage, and temperature conditions. Its internal 1.25-V trimmed bandgap reference and error amplifier drive the gate of the P-FET to maintain regulation with <±2% tolerance over temperature and line/load variations.
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 an enable circuit with no internal pullup/pulldown - requiring external termination to IN or a logic source. The SNS pin enables remote sensing for precision regulation at the load, compensating for PCB trace resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5 V ±2% (25°C), ±4% (–40°C to 125°C) - ensures stable core voltage for low-power microcontrollers and ADCs. |
| Max Output Current | 500 mA - supports moderate-power digital loads without external heat sinking in WSON package. |
| Dropout Voltage | 250 mV typical at 500 mA (VOUT = 5 V); 450 mV max at 500 mA (VOUT = 2.5 V) - enables operation from single-cell Li-ion or 3.3-V rails with minimal headroom. |
| Quiescent Current | 55 µA typical at full load; 1 µA in shutdown (VEN ≤ 0.4 V) - extends battery life in always-on sensor nodes. |
| PSRR | 55 dB at 120 Hz (VIN = VOUT + 2 V, 1 Vp-p ripple) - suppresses switching noise from upstream DC/DC converters. |
| Enable Threshold | VEN(MIN) = 3 V (VIN = 6 V), VEN(MAX) = 4 V (VIN = 10 V) - compatible with standard 3.3-V GPIO without level shifting. |
| Thermal Shutdown | Activates at 160°C junction temperature with 10°C hysteresis - protects against sustained overload in sealed enclosures. |
Pinout & Package
The LP38693QSDX-2.5/NOPB is housed in a 3.0 mm × 3.0 mm, 6-pin WSON package with exposed thermal pad (DAP) for enhanced heat dissipation. Pin 1 is IN, Pin 2 is GND, Pin 3 is EN, Pin 4 is OUT, Pin 5 is SNS, and Pin 6 is IN (dual-input configuration required for full 500-mA capability).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pins 1 & 6) | Input supply connection | Both pins must be tied together to support full 500-mA load; each rated for 250 mA max - prevents current imbalance and thermal stress. |
| GND (Pin 2) | Power and signal reference ground | Internally connected to die substrate and DAP; requires soldering DAP to large copper plane for optimal thermal performance (RθJB = 24.9°C/W). |
| EN (Pin 3) | Active-high enable control | Pull high ≥3 V (VIN = 6 V) to enable; pull low ≤0.4 V to disable - enables power sequencing and system-level sleep mode control. |
| OUT (Pin 4) | Regulated output voltage | Delivers 2.5 V to load; connects directly to local bypass capacitor and SNS pin for basic operation. |
| SNS (Pin 5) | Remote output voltage sense | Must be connected to load-side of output trace - eliminates voltage drop error due to PCB resistance, critical for <1% load regulation accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Stable with 1-µF ceramic output capacitor | Eliminates need for bulky tantalum or electrolytic caps - reduces board area and improves reliability in portable designs. |
| PMOS pass transistor architecture | Maintains ground current ≤100 µA regardless of load, input voltage, or temperature - simplifies power budgeting in battery systems. |
| Remote sensing (SNS) capability | Compensates for up to 100 mΩ trace resistance between regulator and load - preserves 2.5 V ±2% accuracy at point-of-load. |
| Foldback current limiting | Reduces short-circuit current to 350 mA when VIN–VOUT > 5 V - limits power dissipation during fault conditions without external components. |
| 1-µA shutdown quiescent current | Enables true zero-power standby in IoT edge nodes - extends shelf life and runtime in energy-harvesting applications. |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Compact wearable ECG front-end powered by coin cell or rechargeable Li-ion. IC Role / Device Role / Timing Role: Primary 2.5-V analog supply for precision ADC, op-amps, and low-power MCU. Use Value: 1-µF ceramic stability and 55-µA ground current maximize battery life; SNS pin ensures <0.5% voltage error at sensor amplifier inputs. |
Use Scenario: DIN-rail mounted programmable logic controller with isolated analog input channels. IC Role / Device Role / Timing Role: Local 2.5-V reference supply for 16-bit SAR ADCs and signal conditioning circuitry. Use Value: ±2% output accuracy over –40°C to 125°C guarantees measurement repeatability; thermal shutdown prevents field failure in unventilated cabinets. |
| Automotive Body Control Units | Test & Measurement Handhelds |
Use Scenario: Low-power door module with LIN transceiver, EEPROM, and LED drivers. IC Role / Device Role / Timing Role: Secondary regulated rail derived from 5-V body bus, enabled via microcontroller GPIO. Use Value: EN pin allows synchronized power-up/down with CAN/LIN communication stack; foldback limiting protects against wiring faults. |
Use Scenario: Battery-operated multimeter with LCD, microcontroller, and precision voltage reference. IC Role / Device Role / Timing Role: Clean 2.5-V supply for internal bandgap reference and ADC reference buffer. Use Value: 55-dB PSRR at 120 Hz rejects ripple from internal charge pump; 250-mV dropout enables use down to 2.75-V battery voltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPL7407LDR | 7-channel 500-mA N-channel array; 300-mV dropout at 500 mA; no SNS pin; 1.8–6-V input; fixed 3.3/5-V options only. | Lacks remote sensing and 2.5-V option; suited for multi-rail digital I/O buffering, not precision analog supplies. | Select TPL7407LDR only when consolidating multiple non-critical rails and 2.5-V output is not required. |
| TPS7A2025PDQNR | Single 500-mA LDO; 165-mV dropout at 500 mA; 2.5-V fixed; no SNS; 25-µA IQ; 6-pin WSON (same footprint). | Lower dropout and quiescent current but no remote sensing - better for ultra-low-power apps where trace IR drop is negligible. | Choose TPS7A2025PDQNR for longest battery life in compact devices where PCB layout minimizes trace resistance. |
Compared with TPL7407LDR and TPS7A2025PDQNR, the LP38693QSDX-2.5/NOPB uniquely combines 2.5-V fixed output, SNS-based remote sensing, and robust foldback limiting - making it the only choice when load-point voltage accuracy and fault resilience are design-critical.
Availability
LP38693QSDX-2.5/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, automotive body electronics, and industrial PLC I/O modules requiring stable component supply with guaranteed long-term manufacturability.
Supply support for LP38693QSDX-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 delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The LP38693QSDX-2.5/NOPB belongs to TI's LP3869x family of low-noise, ceramic-capacitor-stable LDOs designed specifically for battery-powered portable systems demanding high accuracy, low dropout, and minimal quiescent current.
FAQ
What is the minimum input voltage required for LP38693QSDX-2.5/NOPB to regulate 2.5 V?
The LP38693QSDX-2.5/NOPB requires VIN ≥ (VOUT + VDO) or 2.7 V, whichever is higher. With a typical dropout of 450 mV at 500 mA for 2.5-V output, minimum VIN is 2.95 V under full load. At light load, dropout drops to ~100 mV, allowing regulation down to 2.6 V - but the device does not function below 2.7 V per recommended operating conditions.
Can the SNS pin of LP38693QSDX-2.5/NOPB be left unconnected?
No - the SNS pin of LP38693QSDX-2.5/NOPB must be connected directly to the OUT pin if remote sensing is not used. Leaving it floating violates the absolute maximum rating and may cause regulation instability or damage. When remote sensing is implemented, SNS connects to the load-side of the output trace, not to OUT.
Does LP38693QSDX-2.5/NOPB support reverse voltage protection?
The LP38693QSDX-2.5/NOPB has no integrated reverse-voltage protection. Its internal PMOS pass transistor includes a parasitic body diode that conducts reverse current if VOUT exceeds VIN by >500 mV. For reverse-voltage scenarios, an external Schottky diode from OUT to GND is recommended to clamp negative excursions and limit reverse current.
What is the thermal performance of LP38693QSDX-2.5/NOPB in its WSON package?
In the 3.0 mm × 3.0 mm WSON package, LP38693QSDX-2.5/NOPB has RθJA = 50.6°C/W (high-K board), RθJB = 24.9°C/W, and RθJC(bot) = 5.4°C/W. With proper DAP soldering to ≥1-in² copper pour, it sustains 500 mA at 85°C ambient. Thermal shutdown activates at 160°C junction temperature with 10°C hysteresis to prevent permanent damage.
Is LP38693QSDX-2.5/NOPB pin-compatible with other LP3869x variants?
Yes - LP38693QSDX-2.5/NOPB shares identical 6-pin WSON (NGG) pinout with LP38691SD, LP38693SD, and LP38693-Q1 variants. However, LP38691 lacks EN and SNS pins (pins 3 and 5 are NC), so direct substitution requires PCB modification to accommodate those functions or tie them appropriately.
LP38693QSDX-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)
LP38693QSDX-2.5/NOPB FAQ
1.How can I place an order for LP38693QSDX-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP38693QSDX-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 LP38693QSDX-2.5/NOPB reliable?
The price and inventory of LP38693QSDX-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 LP38693QSDX-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LP38693QSDX-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP38693QSDX-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP38693QSDX-2.5/NOPB?
LP38693QSDX-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP38693QSDX-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 LP38693QSDX-2.5/NOPB?
For technical support, including LP38693QSDX-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP38693QSDX-2.5/NOPB requirements.
6.How does Aetrix verify that LP38693QSDX-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LP38693QSDX-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 LP38693QSDX-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LP38693QSDX-2.5/NOPB?
All LP38693QSDX-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP38693QSDX-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 LP38693QSDX-2.5/NOPB part is unused and in its original packaging.
Return procedure for LP38693QSDX-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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