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Texas Instruments LP38693MPX-1.8
- Part No.:
- LP38693MPX-1.8
- Manufacturer:
- Texas Instruments
- Package:
- TO-261-5, TO-261AB
- Datasheet:
-
LP38693MPX-1.8.pdf
- Description:
- IC REG LIN 1.8V 500MA SOT223-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,003
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Product details
Overview
LP38693MPX-1.8 from Texas Instruments is a 500-mA, 1.8-V fixed-output low-dropout CMOS 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 power rail for microcontroller core supplies in portable instrumentation.
For engineers reviewing the LP38693MPX-1.8 datasheet, LP38693MPX-1.8 pinout, LP38693MPX-1.8 application, or LP38693MPX-1.8 equivalent, key selection considerations include dropout voltage at 1.8 V output, EN pin logic thresholds across temperature, thermal performance in WSON-6 with exposed pad, and foldback current limiting behavior during enable sequencing.
Technical Context
The LP38693MPX-1.8 uses a PMOS pass transistor enabling ultra-low ground pin current (55 µA typical at full load) independent of input voltage or temperature. Its internal 1.25-V trimmed bandgap reference and error amplifier deliver tight DC regulation and fast transient response.
Enable functionality is implemented via a dedicated EN pin with no internal pull-up/down; activation requires VEN ≥ 1.8 V (min) at VIN = 4 V, rising cleanly through threshold without hysteresis. Thermal shutdown activates at ~160°C junction temperature with ~10°C hysteresis.
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 1.8-V logic and ADCs. |
| Max Output Current | 500 mA - supports moderate-power microcontrollers and sensor interfaces without external boost. |
| Dropout Voltage | 250 mV typical at 500 mA (VOUT = 5 V); for 1.8 V output, minimum VIN ≈ 2.05 V at 500 mA - enables operation from single-cell Li-ion or 2.5-V rails. |
| Quiescent Current | 55 µA typical at full load; 1 µA in shutdown (VEN ≤ 0.4 V) - extends battery life in always-on sensing nodes. |
| PSRR | 55 dB at 120 Hz - suppresses ripple from switching pre-regulators feeding the LDO. |
| Thermal Shutdown | Activates at ~160°C junction temp with ~10°C hysteresis - protects against sustained overload in compact enclosures. |
| Stability | Guaranteed with 1-µF ceramic COUT - eliminates need for large tantalum capacitors, reducing board area and cost. |
Pinout & Package
LP38693MPX-1.8 is housed in a 6-pin WSON package (3.0 mm × 3.0 mm) with exposed thermal pad (DAP) on bottom for enhanced heat dissipation. The DAP must be soldered to a PCB copper plane per TI AN-1187.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pins 1, 6) | Input supply connection | Both pins must be tied together externally; each rated for ≤250 mA - enables robust high-current routing in compact layout. |
| OUT (Pin 3) | Regulated output | Delivers 1.8 V to load; connects directly to local decoupling and SNS for remote sensing. |
| SNS (Pin 5) | Remote output sense | Must be connected to load-side of output trace to compensate for IR drop - improves regulation accuracy under dynamic load. |
| GND (Pin 2) | Power ground | Reference node for regulation; thermally coupled to die - requires low-impedance connection to PCB ground plane. |
| EN (Pin 4) | Enable control input | Active-high logic: device enabled when VEN ≥ 1.8 V (min); disabled when VEN ≤ 0.4 V (max) - allows system-level power sequencing. |
| DAP | Exposed thermal pad | Not electrically connected; must be soldered to thermal copper pour - reduces RθJA to 50.6°C/W and improves power handling. |
Key Features
| Feature | Design Value |
|---|---|
| PMOS pass transistor architecture | Ground pin current remains ≤55 µA at full load, independent of VIN or temperature - simplifies ground return design and minimizes system quiescent loss. |
| Enable pin with defined thresholds | VEN(MIN) = 1.8 V (at VIN = 4 V), VEN(MAX) = 0.4 V - enables reliable power gating in mixed-voltage systems without external level-shifting. |
| Foldback current limiting | Limits output current to ~350 mA when VIN–VOUT > 5 V, and ~850 mA when VIN–VOUT < 4 V - prevents thermal runaway during short-circuit or low-VIN conditions. |
| Thermal shutdown with hysteresis | Triggers at ~160°C, releases at ~150°C - provides self-recovering protection during temporary overload without requiring system intervention. |
| Stable with ultralow-ESR ceramics | Validated with 1-µF X7R/X5R MLCCs - eliminates ESR requirements, reduces BOM count, and improves reliability vs. tantalum alternatives. |
Applications
| Hard Disk Drive Power Management | Notebook Computer Core Rail |
|---|---|
Use Scenario: Supplies 1.8-V logic and servo control circuitry in 2.5-inch HDDs where space and thermal density are constrained. IC Role / Device Role / Timing Role: Primary LDO for microcontroller core and interface logic, replacing discrete regulators with higher dropout and lower accuracy. Use Value: 250 mV dropout enables operation from 2.5-V intermediate bus; ±2% tolerance ensures compliance with JEDEC JESD8-12B core voltage specs. | Use Scenario: Powers SoC I/O banks and embedded controllers in ultrabooks requiring low-noise, sequenced 1.8-V rails. IC Role / Device Role / Timing Role: Secondary regulated rail activated after main 3.3-V supply stabilizes, controlled via EN pin from system PMIC. Use Value: 1 µA shutdown current minimizes standby drain; EN pin timing allows precise power-up sequencing per ACPI S0ix states. |
| Battery-Powered Portable Instrumentation | Industrial Sensor Node Power |
Use Scenario: Delivers clean 1.8-V supply to precision ADCs and low-power MCUs in handheld multimeters and data loggers. IC Role / Device Role / Timing Role: Low-noise analog rail generator with remote sensing (SNS) to maintain accuracy across PCB trace resistance. Use Value: 0.7 µV/√Hz output noise preserves SNR in 16-bit+ ADC measurements; SNS pin compensates for up to 100 mΩ trace resistance. | Use Scenario: Powers wireless sensor transceivers (e.g., BLE, LoRa) and MEMS sensors in IP67-rated field devices operating from Li-SOCl₂ cells. IC Role / Device Role / Timing Role: Always-on LDO with EN pin controlled by MCU wake-up interrupt, enabling sub-µA sleep current. Use Value: 1 µA off-state IQ extends 10-year battery life; wide 2.7–10 V input range accommodates cell voltage decay from 3.6 V to 2.7 V. |
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 |
|---|---|---|---|
| TPL7407LPGQ | 7-channel NMOS array with integrated 100-mA LDO per channel; 1.8-V output not available - fixed 3.3 V only. | Designed for LED driver + bias rail integration; lacks remote sense and thermal shutdown. | Select only if multi-rail consolidation and GPIO-driven enable are required - not suitable for precision 1.8-V analog rails. |
| MCP1826T-1802E/DB | 500-mA 1.8-V LDO in SOT-23-5; no EN pin, no SNS, 350 mV dropout at 500 mA - higher dropout than LP38693MPX-1.8. | Targeted at cost-sensitive consumer electronics; lacks automotive-grade qualification and extended temp support. | Choose for simple, low-cost point-of-load use where enable control and remote sensing are unnecessary. |
Compared with TPL7407LPGQ and MCP1826T-1802E/DB, LP38693MPX-1.8 uniquely combines 1.8-V fixed output, EN pin, SNS capability, ±2% accuracy over –40°C to 125°C, and 250-mV dropout - making it optimal for thermally constrained, high-accuracy portable and industrial applications requiring active power management.
Availability
LP38693MPX-1.8 is available at Aetrix Electronics and suitable for hard disk drives, notebook computers, and battery-powered portable instrumentation requiring stable component supply, long-term lifecycle assurance, and automotive-grade reliability.
Supply support for LP38693MPX-1.8 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 connectivity solutions for industrial, automotive, and personal electronics markets.
The LP3869x family was developed specifically for portable, battery-powered digital systems requiring accurate, low-noise, low-quiescent-current regulation with fast start-up and robust thermal protection.
FAQ
What is the minimum input voltage required for LP38693MPX-1.8 to regulate 1.8 V at 500 mA?
The LP38693MPX-1.8 requires VIN ≥ (VOUT + VDO). At 500 mA and 25°C, VDO is 250 mV for VOUT = 5 V; for 1.8 V output, typical dropout is ~150 mV. Thus, minimum VIN is ~1.95 V. However, per datasheet Section 7.4, the absolute minimum VIN for functional operation is 2.7 V - so regulation begins reliably at VIN ≥ 2.7 V, provided VIN ≥ VOUT + VDO.
Does LP38693MPX-1.8 require an external resistor divider to set the output voltage?
No. LP38693MPX-1.8 is a fixed-output regulator with internally trimmed 1.8-V reference. It does not use external feedback resistors. The "MPX" suffix denotes the 1.8-V fixed version; adjustable variants (e.g., LP38693SD-ADJ) exist but require external resistors - LP38693MPX-1.8 does not.
Can the SNS pin of LP38693MPX-1.8 be left unconnected if remote sensing is not needed?
No. Per datasheet Section 6 and Figure 25, the SNS pin is mandatory for WSON-package LP38693 devices and must be connected directly to the OUT pin. Leaving it floating violates the internal error amplifier configuration and may cause instability or regulation failure. It is not optional - even without remote trace compensation, SNS must tie to OUT.
What is the maximum allowable power dissipation for LP38693MPX-1.8 in its WSON-6 package?
Using RθJA = 50.6°C/W (from Table 7.5) and max TJ = 125°C, PDMAX = (125°C − TA)/50.6. At TA = 25°C, PDMAX ≈ 1.98 W. Actual dissipation is PD = (VIN − 1.8 V) × IOUT. For example, at VIN = 5 V and IOUT = 500 mA, PD = 1.6 W - within safe limit if thermal pad is properly soldered and board copper area ≥ 1 cm².
Is LP38693MPX-1.8 qualified for automotive applications?
No. LP38693MPX-1.8 is the commercial-grade variant. Automotive-qualified equivalents are LP38693-Q1 (same functionality, AEC-Q100 Grade 1, –40°C to 125°C) and LP38693MPW-1.8Q1 (WSON-6 Q1 version). The "MPX" suffix indicates commercial temperature range (–40°C to 125°C is specified, but not AEC-Q100 tested); only parts with "-Q1" suffix are automotive qualified.
LP38693MPX-1.8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-261-5, TO-261AB
- 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):
- 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 FAQ
1.How can I place an order for LP38693MPX-1.8 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP38693MPX-1.8 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 reliable?
The price and inventory of LP38693MPX-1.8 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 is usually 5 days.
3.What payment methods are accepted for LP38693MPX-1.8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP38693MPX-1.8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP38693MPX-1.8?
LP38693MPX-1.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP38693MPX-1.8 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?
For technical support, including LP38693MPX-1.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP38693MPX-1.8 requirements.
6.How does Aetrix verify that LP38693MPX-1.8 is sourced from the original manufacturer or authorized distributors?
All LP38693MPX-1.8 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 meets industry standards.
7.What is the process for return or replacement of LP38693MPX-1.8?
All LP38693MPX-1.8 units undergo pre-shipment inspection (PSI). If there is an issue with LP38693MPX-1.8, 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 part is unused and in its original packaging.
Return procedure for LP38693MPX-1.8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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