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Texas Instruments LP38693MPX-5.0
- Part No.:
- LP38693MPX-5.0
- Manufacturer:
- Texas Instruments
- Package:
- TO-261-5, TO-261AB
- Datasheet:
-
LP38693MPX-5.0.pdf
- Description:
- IC REG LINEAR 5V 500MA SOT223-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,463
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Product details
Overview
LP38693MPX-5.0 from Texas Instruments is a 500-mA, 5.0-V fixed-output CMOS low-dropout linear regulator in WSON-6 package, featuring 250 mV dropout at full load, 2% output accuracy over –40°C to 125°C, and enable control for power sequencing in portable instrumentation and battery-powered systems.
For engineers reviewing the LP38693MPX-5.0 datasheet, LP38693MPX-5.0 pinout, LP38693MPX-5.0 application, or LP38693MPX-5.0 equivalent, key selection considerations include dropout voltage at 500 mA, EN pin logic thresholds, thermal performance in WSON-6, remote sense capability (SNS), and stability with 1-µF ceramic output capacitors.
Technical Context
The LP38693MPX-5.0 uses a PMOS pass transistor enabling ultra-low ground current (55 µA typical at full load) and eliminating base-drive losses. Its internal trimmed bandgap reference and feedback loop ensure tight DC regulation and fast transient response.
It integrates foldback current limiting (350 mA at VIN–VOUT > 5 V; 850 mA at < 4 V), thermal shutdown activation at 160°C with 10°C hysteresis, and operates across 2.7 V to 10 V input while maintaining regulation down to VIN = VOUT + VDO.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±2% over –40°C to 125°C - ensures stable MCU core or peripheral rail without external resistors. |
| Max Output Current | 500 mA - supports moderate-power digital loads such as microcontrollers, sensors, and interface ICs. |
| Dropout Voltage | 250 mV at 500 mA (TYP), 450 mV max over full temp range - enables operation from single-cell Li-ion or 2-cell alkaline inputs. |
| Quiescent Current | 100 µA typical, 1 µA in shutdown (VEN ≤ 0.4 V) - extends battery life in always-on monitoring applications. |
| PSRR | 55 dB at 120 Hz - suppresses ripple from switching pre-regulators or noisy DC/DC stages. |
| Enable Threshold | VEN(MIN) = 3 V (at VIN = 6 V), VEN(MAX) = 0.4 V - compatible with standard GPIO logic levels for controlled power-up sequencing. |
| Thermal Shutdown | Activates at 160°C junction, recovers at ~150°C - protects against sustained overload or poor PCB thermal design. |
Pinout & Package
LP38693MPX-5.0 is housed in a thermally enhanced 6-pin WSON package (3.0 mm × 3.0 mm, 0.8-mm height) with exposed thermal pad (DAP) soldered to PCB copper for low RθJB = 24.9°C/W.
| 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 and reduces trace inductance. |
| OUT (Pin 3) | Regulated output node | Primary power delivery point; connects directly to load and 1-µF ceramic capacitor - minimal external components required. |
| SNS (Pin 5) | Remote output voltage sense | Must be connected to load-side of output trace - eliminates IR drop error for precision 5.0-V rail at point-of-load. |
| GND (Pin 2) | Power and signal reference | Low-impedance return path; ties to DAP for thermal conduction - critical for noise immunity and thermal reliability. |
| EN (Pin 4) | Active-high enable control | Pulled high to enable regulation; pulled ≤0.4 V to disable - allows system-level power gating and wake-up control. |
| DAP (Exposed Pad) | Thermal and electrical ground | Must be soldered to ≥100 mm² copper pour - reduces junction-to-board thermal resistance by >40% vs. non-thermal-pad packages. |
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 space-constrained designs. |
| PMOS pass transistor architecture | Maintains ground pin current ≤100 µA regardless of load, input, or temperature - simplifies current-sense and battery monitoring circuits. |
| Enable pin with defined logic thresholds | Supports deterministic power sequencing in multi-rail systems without external level-shifting or pull-up networks. |
| Remote sense (SNS) pin | Compensates for up to 100 mΩ PCB trace resistance - preserves ±2% output accuracy at the load under varying current conditions. |
| Foldback current limiting | Reduces short-circuit power dissipation by limiting output current as VOUT collapses - enhances fault tolerance during output faults or hot-plug events. |
Applications
| Portable Medical Sensors | Industrial Data Loggers |
|---|---|
Use Scenario: Battery-powered wearable ECG sensor requiring stable 5.0-V analog front-end supply across 0°C–50°C ambient. IC Role / Device Role / Timing Role: Primary LDO delivering clean, low-noise 5.0-V rail to ADC, op-amps, and Bluetooth radio. Use Value: 250-mV dropout enables >3.2-V operation from partially discharged Li-ion cell; 0.7 µV/√Hz noise avoids SNR degradation in 16-bit measurements. | Use Scenario: Remote environmental monitor using 2xAA alkaline cells (1.8–3.2 V) powering 5.0-V microcontroller and SD card interface. IC Role / Device Role / Timing Role: Input-stage regulator boosting available voltage to fixed 5.0-V rail for USB-compliant peripherals. Use Value: Wide 2.7–10 V input range accommodates full battery discharge curve; EN pin synchronizes with MCU sleep/wake cycles to minimize quiescent drain. |
| Automotive Body Control Modules | Test & Measurement Equipment |
Use Scenario: 12-V automotive subsystem (e.g., door module) deriving 5.0-V logic rail from switched battery with load-dump transients. IC Role / Device Role / Timing Role: Secondary LDO after primary DC/DC converter, providing isolated, low-noise 5.0-V supply for CAN transceivers and microcontrollers. Use Value: AEC-Q100 Grade 1 qualification (LP38693-Q1 variant) ensures operation to 125°C; thermal shutdown prevents latch-up during sustained overloads. | Use Scenario: Benchtop oscilloscope auxiliary power rail supplying 5.0-V to FPGA configuration memory and clock buffers. IC Role / Device Role / Timing Role: Precision local regulator decoupling sensitive timing circuitry from main system power. Use Value: 2% output tolerance and 55 dB PSRR suppress switching noise from adjacent SMPS; SNS pin maintains accuracy despite PCB trace length to FPGA. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLS850F0TES | 500-mA automotive LDO with integrated watchdog and reset; wider input (3–40 V); higher dropout (300 mV @ 500 mA) | Designed for ASIL-B safety-critical domains; includes diagnostic features not present in LP38693MPX-5.0 | Select when functional safety compliance (ISO 26262) and system supervision are required beyond basic regulation. |
| TPS7A2050PDBVR | 500-mA, 5.0-V LDO in 5-pin SOT-23; lower IQ (6.5 µA), no SNS pin; 170 mV dropout @ 500 mA | Optimized for ultra-low-power wearables; lacks remote sensing and thermal pad for high-reliability thermal management | Select when board space is extremely constrained and remote sensing is unnecessary; verify thermal margin at full load. |
Compared with TLS850F0TES and TPS7A2050PDBVR, LP38693MPX-5.0 uniquely balances low dropout, remote sensing, and WSON thermal performance for industrial and portable applications where precision, layout flexibility, and thermal robustness are prioritized over integrated diagnostics or minimum footprint.
Availability
LP38693MPX-5.0 is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered devices, and industrial embedded systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LP38693MPX-5.0 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, embedded processing, and connectivity technologies for industrial, automotive, and personal electronics markets.
The LP38693MPX-5.0 belongs to TI's LP3869x family of CMOS LDOs engineered for high-efficiency, low-noise power delivery in space- and thermal-constrained portable and battery-operated systems.
FAQ
What is the minimum input voltage required for LP38693MPX-5.0 to regulate 5.0 V output?
The LP38693MPX-5.0 requires VIN ≥ VOUT + VDO, where VDO is 250 mV typical at 500 mA. Thus, minimum VIN is 5.25 V under full-load conditions. At light load, dropout drops further; however, the device also requires VIN ≥ 2.7 V for internal circuit functionality - so 5.25 V is the practical minimum for regulated 5.0-V output at 500 mA. The LP38693MPX-5.0 datasheet specifies this as VIN ≥ (VOUT + VDO) or 2.7 V, whichever is greater.
Does LP38693MPX-5.0 require an external resistor divider to set its output voltage?
No. LP38693MPX-5.0 is a fixed-output regulator with internally trimmed 5.0-V reference; no external resistors are needed. The "MPX" suffix denotes the WSON-6 package with enable (EN) and remote sense (SNS) pins. This differs from adjustable variants like LP38693SD-ADJ, which require external feedback resistors. The LP38693MPX-5.0 delivers precisely 5.0 V ±2% across temperature and load without any external components beyond input/output capacitors.
Can the SNS pin of LP38693MPX-5.0 be left unconnected if remote sensing is not needed?
No. Per the LP38693MPX-5.0 datasheet, the SNS pin must be connected directly to the OUT pin when remote sensing is not used. Leaving it floating violates absolute maximum ratings and may cause regulation instability or damage. The SNS pin is not internally terminated; it functions as a high-impedance feedback node. For standard local regulation, tie SNS to OUT with a short, low-inductance trace - this ensures proper loop compensation and maintains the specified 2% output accuracy.
What is the thermal performance difference between LP38693MPX-5.0 in WSON-6 versus SOT-223 package?
LP38693MPX-5.0 is only offered in WSON-6 (NGG) package; the SOT-223 variant is the LP38693SD (no "MPX" suffix). The WSON-6 package has RθJB = 24.9°C/W and RθJC(bot) = 5.4°C/W, significantly better than SOT-223's RθJB = 13.0°C/W and RθJC(bot) = n/a - due to the exposed thermal pad. This means LP38693MPX-5.0 achieves lower junction temperature rise per watt in PCBs with adequate copper pour, enabling higher continuous current in compact layouts. The LP38693MPX-5.0 thermal design must use the WSON-specific mounting guidelines in AN-1187.
Is LP38693MPX-5.0 qualified for automotive applications?
The standard LP38693MPX-5.0 is not AEC-Q100 qualified. However, the pin-compatible LP38693Q1MPX-5.0 (or LP38693-Q1 series) is AEC-Q100 Grade 1 qualified (–40°C to +125°C) and intended for automotive body electronics. Both share identical electrical specs and WSON-6 packaging, but only the Q1 variant undergoes automotive stress testing and has certified PPAP documentation. For automotive use, specify LP38693Q1MPX-5.0 - the LP38693MPX-5.0 is intended for industrial and commercial applications.
LP38693MPX-5.0 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):
- 5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.45V @ 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-5.0 FAQ
1.How can I place an order for LP38693MPX-5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP38693MPX-5.0 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-5.0 reliable?
The price and inventory of LP38693MPX-5.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP38693MPX-5.0 is usually 5 days.
3.What payment methods are accepted for LP38693MPX-5.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP38693MPX-5.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP38693MPX-5.0?
LP38693MPX-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP38693MPX-5.0 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-5.0?
For technical support, including LP38693MPX-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP38693MPX-5.0 requirements.
6.How does Aetrix verify that LP38693MPX-5.0 is sourced from the original manufacturer or authorized distributors?
All LP38693MPX-5.0 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-5.0 meets industry standards.
7.What is the process for return or replacement of LP38693MPX-5.0?
All LP38693MPX-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LP38693MPX-5.0, 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-5.0 part is unused and in its original packaging.
Return procedure for LP38693MPX-5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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