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Texas Instruments LP38693MPX-1.8/NOPB
- Part No.:
- LP38693MPX-1.8/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-261-5, TO-261AB
- Datasheet:
-
LP38693MPX-1.8/NOPB.pdf
- Description:
- IC REG LIN 1.8V 500MA SOT223-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,819
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Product details
Overview
LP38693MPX-1.8/NOPB from Texas Instruments is a 500-mA, 1.8-V fixed-output CMOS low-dropout linear regulator in WSON-6 package with enable (EN) pin, 250 mV dropout at 500 mA (VOUT = 5 V), ±2% output accuracy over –40°C to 125°C, and stable operation with 1-µF ceramic output capacitor. It serves as a primary voltage rail for microcontroller cores in portable instrumentation and battery-powered devices.
For engineers reviewing the LP38693MPX-1.8/NOPB datasheet, LP38693MPX-1.8/NOPB pinout, LP38693MPX-1.8/NOPB application, or LP38693MPX-1.8/NOPB equivalent, key selection considerations include dropout performance at 1.8 V output, EN pin logic thresholds across temperature, thermal derating in compact PCB layouts, and compatibility with ultra-low-ESR ceramic capacitors without external compensation.
Technical Context
The LP38693MPX-1.8/NOPB uses a PMOS pass transistor architecture enabling ground pin current ≤55 µA at full load and eliminating base-drive current dependency. Its internal trimmed bandgap reference and feedback loop ensure tight DC regulation and fast transient response under dynamic load steps.
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 conduction when VOUT > VIN + 500 mV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±2% over –40°C to 125°C - ensures stable core supply for low-voltage MCUs without external resistor network. |
| Max Output Current | 500 mA - supports single-core ARM Cortex-M processors and sensor interface ICs in space-constrained designs. |
| Dropout Voltage | 250 mV typical at 500 mA (VOUT = 5 V); 100 mV at 100 mA (VOUT = 1.8 V) - enables operation from single-cell Li-ion (3.0 V min) with margin. |
| Quiescent Current | 55 µA typical at full load; 1 µA in shutdown (VEN ≤ 0.4 V) - extends battery life in always-on monitoring systems. |
| PSRR | 55 dB at 120 Hz - suppresses ripple from switching pre-regulators feeding the LDO input. |
| Enable Threshold | VEN(MIN) = 1.8 V (VIN = 4 V), 3.0 V (VIN = 6 V), 4.0 V (VIN = 10 V) - compatible with 1.8-V and 3.3-V GPIO control without level-shifting. |
| Thermal Shutdown | Activates at 160°C junction temperature with 10°C hysteresis - protects against sustained overload in sealed enclosures. |
Pinout & Package
LP38693MPX-1.8/NOPB is housed in a thermally enhanced 6-pin WSON package (3.0 mm × 3.0 mm, 0.75 mm height) with exposed thermal pad (DAP) on bottom for PCB copper plane attachment. 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 require external tie).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pins 1 & 6) | Input supply connection | Both pins must be externally tied; each rated for ≤250 mA - enables high-current routing while maintaining low-inductance path. |
| GND (Pin 2) | Power ground reference | Primary return path for regulator control circuitry and output current - requires low-impedance connection to PCB ground plane. |
| EN (Pin 3) | Enable control input | Active-high logic input; no internal pullup/pulldown - must be actively driven or pulled to IN for default ON operation. |
| OUT (Pin 4) | Regulated output | Delivers 1.8 V to load; connects directly to local 1-µF ceramic capacitor - minimal trace length required for stability. |
| SNS (Pin 5) | Remote output sense | Connects to load-side of output trace to compensate for IR drop - must be tied directly to OUT if remote sensing not used. |
| DAP (Exposed Pad) | Thermal interface | Electrically connected to GND; soldered to ≥100 mm² copper area - reduces RθJA by 25.7°C/W vs non-thermal-pad variant. |
Key Features
| Feature | Design Value |
|---|---|
| Stable with 1-µF ceramic output capacitor | Eliminates need for larger tantalum or aluminum electrolytic caps - reduces board area and improves reliability in portable designs. |
| PMOS pass transistor architecture | Maintains ground pin current ≤55 µA regardless of load, input voltage, or temperature - simplifies power budgeting in multi-rail systems. |
| Enable pin with defined ON/OFF thresholds | Supports precise sequencing in multi-supply systems and enables deep-sleep modes without external MOSFET switches. |
| Foldback current limiting | Reduces short-circuit current as output collapses - limits power dissipation during fault conditions and eases thermal design. |
| Thermal shutdown with hysteresis | Prevents latch-up during intermittent overload; 10°C recovery gap avoids oscillation near trip point in marginally cooled layouts. |
Applications
| Portable Instrumentation | Battery-Powered IoT Sensors |
|---|---|
Use Scenario: Handheld multimeter with 16-bit ADC, LCD display, and Bluetooth LE radio operating from 3.7-V Li-ion cell. IC Role / Device Role / Timing Role: Primary 1.8-V core supply for MCU and precision analog front-end - regulates voltage despite battery discharge from 4.2 V to 3.0 V. Use Value: 250-mV dropout enables >1.5 V headroom at end-of-discharge, preserving ADC accuracy and RF transmit power. | Use Scenario: Wireless environmental node with temperature/humidity sensor, LoRa transceiver, and coin-cell backup. IC Role / Device Role / Timing Role: Low-quiescent 1.8-V rail for sensor interface and sleep-state MCU retention - activated only during measurement bursts. Use Value: 1-µA shutdown current extends 220-mAh coin-cell life to >5 years in 1-minute wake-up intervals. |
| Notebook Subsystem Power | Industrial Control I/O Module |
Use Scenario: USB-C powered docking station providing auxiliary 1.8-V rail for FPGA configuration memory and level translators. IC Role / Device Role / Timing Role: Secondary regulated output derived from 5-V USB PD bus - immune to upstream switching noise. Use Value: 55-dB PSRR at 120 Hz rejects ripple from USB-C buck converters, preventing bit errors in SPI flash programming. | Use Scenario: DIN-rail mounted PLC I/O module with isolated 1.8-V digital logic for optocoupler drivers and status LEDs. IC Role / Device Role / Timing Role: Isolated post-regulator supplying noise-sensitive digital logic - fed from isolated 5-V DC-DC converter. Use Value: Remote SNS pin compensates for 150-mΩ PCB trace resistance between regulator and load, holding output within ±18 mV tolerance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPL7407LPGEDR | 7-channel 100-mA sink driver with integrated LDO; no enable pin; 1.8-V output not available - requires external resistor divider for 1.8 V. | Designed for LED/relay driving; lacks remote sense and thermal shutdown hysteresis - unsuitable for precision core rails. | Select LP38693MPX-1.8/NOPB when single-channel 1.8-V regulation with EN control and thermal safety is required. |
| TPS7A0518PDBVR | 200-mA LDO with 1.8-V fixed output; 1.4-µA quiescent current; no SNS pin; 220-mV dropout at 200 mA - lower current rating and no remote sensing. | Optimized for ultra-low-power wearables; lacks foldback limiting and thermal hysteresis - limited fault robustness in industrial settings. | Choose LP38693MPX-1.8/NOPB for 500-mA loads, remote sensing, and robust thermal/current protection in demanding environments. |
Compared with TPL7407LPGEDR and TPS7A0518PDBVR, LP38693MPX-1.8/NOPB uniquely delivers 500-mA capability with remote sense, programmable enable, and thermal hysteresis - making it the only option among the three qualified for high-reliability 1.8-V core regulation in portable instrumentation and industrial I/O.
Availability
LP38693MPX-1.8/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered IoT sensors, and notebook subsystem power requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LP38693MPX-1.8/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 headquartered in Dallas, Texas, designing and manufacturing analog and embedded processing chips for industrial, automotive, and personal electronics markets.
LP38693MPX-1.8/NOPB belongs to the LP3869x family of low-dropout CMOS regulators engineered for portable, battery-powered digital systems requiring accurate output voltage, fast start-up, and ceramic-capacitor stability - especially where space, thermal, and quiescent current constraints are critical.
FAQ
What is the minimum input voltage required for LP38693MPX-1.8/NOPB to regulate 1.8 V output?
The LP38693MPX-1.8/NOPB requires VIN ≥ (VOUT + VDO), where VDO is 100 mV typical at 100 mA (1.8 V output). Thus, minimum VIN is 1.9 V under light load. However, per datasheet recommended operating conditions, VIN must be ≥2.7 V for full functionality of internal circuitry - so 2.7 V is the practical minimum for guaranteed regulation across temperature and load.
Does LP38693MPX-1.8/NOPB require external resistors to set its 1.8-V output?
No. LP38693MPX-1.8/NOPB is a fixed-output regulator with factory-trimmed bandgap reference and internal feedback divider. Its 1.8-V output is achieved without external resistors - simplifying layout and eliminating resistor tolerance and drift effects on output accuracy.
Can the SNS pin of LP38693MPX-1.8/NOPB be left unconnected in standard applications?
No. The SNS pin must be tied directly to the OUT pin if remote sensing is not used. Leaving SNS floating violates the absolute maximum ratings and may cause regulation instability or output inaccuracy. For local regulation, connect SNS to OUT with shortest possible trace.
What is the thermal resistance (RθJA) of LP38693MPX-1.8/NOPB in its WSON-6 package?
The LP38693MPX-1.8/NOPB in WSON-6 package has RθJA = 50.6°C/W (High-K board condition). This value assumes proper soldering of the exposed thermal pad to ≥100 mm² of 2-oz copper - reducing junction-to-ambient rise by up to 25°C compared to non-thermal-pad alternatives at 500 mA load.
How does the foldback current limiting behave during repeated enable cycles of LP38693MPX-1.8/NOPB?
Per datasheet CAUTION note, foldback current limiting is functional only on the first EN high transition after VIN application. Subsequent toggles of EN do not re-enable foldback - potentially causing higher inrush current. To ensure consistent protection, drive EN only once per power cycle or use external current limiting on the input rail.
LP38693MPX-1.8/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):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- 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-1.8/NOPB FAQ
1.How can I place an order for LP38693MPX-1.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP38693MPX-1.8/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-1.8/NOPB reliable?
The price and inventory of LP38693MPX-1.8/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-1.8/NOPB is usually 5 days.
3.What payment methods are accepted for LP38693MPX-1.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP38693MPX-1.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP38693MPX-1.8/NOPB?
LP38693MPX-1.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP38693MPX-1.8/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-1.8/NOPB?
For technical support, including LP38693MPX-1.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP38693MPX-1.8/NOPB requirements.
6.How does Aetrix verify that LP38693MPX-1.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LP38693MPX-1.8/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-1.8/NOPB meets industry standards.
7.What is the process for return or replacement of LP38693MPX-1.8/NOPB?
All LP38693MPX-1.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP38693MPX-1.8/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-1.8/NOPB part is unused and in its original packaging.
Return procedure for LP38693MPX-1.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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