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Texas Instruments LP38693SDX-5.0
- Part No.:
- LP38693SDX-5.0
- Manufacturer:
- Texas Instruments
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
LP38693SDX-5.0.pdf
- Description:
- IC REG LINEAR 5V 500MA 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,713
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Product details
Overview
LP38693SDX-5.0 from Texas Instruments is a 500-mA, 5.0-V fixed-output CMOS low-dropout linear regulator in WSON-6 package with enable (EN) pin, 250 mV dropout at full load, ±2% output accuracy over –40°C to 125°C, and stable operation with 1-µF ceramic output capacitor. It serves as a precision voltage source for microcontroller core supplies in portable instrumentation.
For engineers reviewing the LP38693SDX-5.0 datasheet, LP38693SDX-5.0 pinout, LP38693SDX-5.0 application, or LP38693SDX-5.0 equivalent, key selection criteria include dropout performance at 500 mA, EN pin logic thresholds, thermal shutdown behavior at 160°C, and compatibility with ultra-low-ESR ceramic capacitors without external compensation.
Technical Context
The LP38693SDX-5.0 uses a PMOS pass transistor enabling ground pin current under 100 µA across load, input voltage, and temperature - critical for battery-powered systems. Its internal 1.25-V trimmed bandgap reference and feedback resistor network set VOUT = 5.0 V with no external components.
Enable functionality is implemented via a dedicated EN pin with no internal pull-up/down; activation requires VIN ≥ 2.7 V and EN ≥ 3.0 V (typical) at VIN = 6 V. Foldback current limiting activates based on VIN–VOUT differential: ~350 mA limit when VIN–VOUT > 5 V, ~850 mA when < 4 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±2% over –40°C to 125°C - ensures stable MCU I/O rail without trimming. |
| Max Output Current | 500 mA - supports single-core ARM Cortex-M processors and peripheral ICs. |
| Dropout Voltage | 250 mV (typ) at 500 mA, 5 V out - enables operation down to VIN = 5.25 V with margin. |
| Quiescent Current | 55 µA (typ) at full load - minimizes standby power in always-on sensor nodes. |
| Enable Threshold | VEN(MIN) = 3.0 V at VIN = 6 V - compatible with 3.3-V GPIO control without level-shifting. |
| Thermal Shutdown | Activates at 160°C junction, 10°C hysteresis - protects against sustained overload in sealed enclosures. |
| PSRR | 55 dB at 120 Hz - suppresses ripple from switching pre-regulators feeding LP38693SDX-5.0. |
| Noise Density | 0.7 µV/√Hz (10 Hz–10 kHz) - suitable for analog front-ends and ADC reference supplies. |
Pinout & Package
LP38693SDX-5.0 is housed in a 3.0 mm × 3.0 mm, 6-pin WSON package 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 high-current routing with reduced trace resistance. |
| GND (Pin 2) | Power ground reference | Primary return path for load current; thermally coupled to die - requires low-impedance PCB ground plane. |
| EN (Pin 3) | Enable control input | Active-high logic input; no internal bias - must be driven or pulled to IN/VIN to ensure reliable startup. |
| OUT (Pin 4) | Regulated output | Delivers 5.0 V to load; connects directly to SNS pin in non-remote-sense configurations. |
| SNS (Pin 5) | Remote sense input | Connects to load-side VOUT to compensate for PCB trace IR drop - required only when precision remote regulation is needed. |
| DAP (Exposed Pad) | Thermal interface | Not electrically connected; must be soldered to ≥100 mm² copper area for RθJB = 24.9°C/W performance. |
Key Features
| Feature | Design Value |
|---|---|
| Stable with 1-µF ceramic output capacitor | Eliminates need for bulk tantalum or electrolytic caps - reduces board area and improves reliability in space-constrained designs. |
| PMOS pass transistor architecture | Maintains ground pin current ≤55 µA at full 500 mA load - preserves battery life in always-on IoT edge devices. |
| Enable pin with defined ON/OFF thresholds | Supports precise power sequencing in multi-rail systems - avoids brown-out during controlled startup/shutdown. |
| Foldback current limiting | Reduces short-circuit current as VOUT collapses - limits power dissipation during fault conditions without external circuitry. |
| Thermal shutdown with hysteresis | Prevents latch-up during transient overloads - allows automatic recovery once junction cools to 150°C. |
| ±2% output tolerance over full temperature range | Meets industrial-grade accuracy requirements without post-production calibration - simplifies BOM and test flow. |
Applications
| Hard Disk Drive Power Management | Notebook Computer Core Supply |
|---|---|
Use Scenario: Provides clean 5.0-V bias to HDD servo controller ASICs during spin-up and seek operations. IC Role / Device Role / Timing Role: Primary LDO for real-time servo loop power - must maintain regulation despite rapid 100–500 mA load transients. Use Value: 250 mV dropout ensures operation from 5.25-V intermediate rail; 55 dB PSRR rejects switching noise from upstream DC/DC converters. | Use Scenario: Supplies 5.0-V I/O rail to embedded controller (EC) and keyboard controller in clamshell form factor. IC Role / Device Role / Timing Role: Always-on LDO enabled by EC GPIO - powers real-time clock and wake logic during S3/S5 sleep states. Use Value: 55 µA quiescent current extends battery runtime in suspend mode; EN pin enables fast wake-up response (<10 µs). |
| Battery-Powered Portable Instrumentation | Industrial Sensor Node Power |
Use Scenario: Powers 5.0-V analog signal chain (op-amps, multiplexers, ADC drivers) in handheld multimeters. IC Role / Device Role / Timing Role: Precision analog supply - must deliver low-noise, stable voltage independent of battery discharge curve. Use Value: 0.7 µV/√Hz noise density and ±2% tolerance ensure <0.1% measurement error across 2.7–10 V input range. | Use Scenario: Supplies 5.0-V rail to LoRaWAN transceiver and environmental sensors in IP67-rated field enclosure. IC Role / Device Role / Timing Role: Main system LDO - operates continuously at –40°C to +85°C ambient with no derating. Use Value: Guaranteed –40°C to 125°C operation and thermal shutdown protect against enclosure overheating in solar-powered deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPL7407LPGQ | 7-channel 500-mA sink driver with integrated LDO - not a standalone regulator; lacks SNS pin and 5.0-V fixed option. | Designed for LED/relay driving; not optimized for clean analog or digital supply rails. | Select LP38693SDX-5.0 when a dedicated, low-noise 5.0-V LDO with enable and remote sense is required. |
| TPS7A2050PDBVR | 500-mA, 5.0-V LDO in SOT-23-5; 165 mV dropout (lower), 25 µA IQ (lower), but no SNS pin and only 1% initial accuracy (not guaranteed over temp). | Better for ultra-low-power apps where remote sensing is unnecessary and tighter initial tolerance suffices. | Choose LP38693SDX-5.0 for industrial-temp stability, thermal robustness, and remote-sense capability in demanding environments. |
Compared with TPL7407LPGQ and TPS7A2050PDBVR, LP38693SDX-5.0 uniquely combines guaranteed ±2% accuracy over –40°C to 125°C, remote sense (SNS), and thermal shutdown hysteresis - making it the preferred choice for precision, high-reliability 5.0-V regulation in portable and industrial equipment.
Availability
LP38693SDX-5.0 is available at Aetrix Electronics and suitable for hard disk drives, notebook computers, and battery-powered portable instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LP38693SDX-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 delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The LP38693SDX-5.0 belongs to TI's LP3869x family of low-dropout CMOS linear regulators, engineered specifically for portable, battery-powered digital systems requiring fast start-up, tight output tolerance, and ceramic-capacitor stability.
FAQ
What is the minimum input voltage required for LP38693SDX-5.0 to regulate 5.0 V output?
The LP38693SDX-5.0 requires VIN ≥ (VOUT + VDO) = 5.0 V + 0.25 V = 5.25 V (typical) to maintain regulation at 500 mA. Per datasheet Section 7.4, the absolute minimum operating VIN is 2.7 V - but regulation only begins once VIN exceeds VOUT plus dropout voltage, which increases with load and temperature. At light loads (<10 mA), regulation starts near 5.05 V.
Does LP38693SDX-5.0 require an external resistor divider to set its 5.0-V output?
No. LP38693SDX-5.0 is a fixed-output regulator with internally trimmed feedback resistors. Its 5.0-V nominal output is factory-set using a precision bandgap reference and laser-trimmed resistive network - no external components are needed for output voltage configuration.
Can the SNS pin of LP38693SDX-5.0 be left unconnected in standard applications?
Yes. The SNS pin is optional and intended only for remote sensing. In standard point-of-load applications, SNS must be connected directly to the OUT pin. Leaving SNS floating is not permitted - it must be tied to OUT or routed to the load for remote sensing; floating violates datasheet recommendations and may cause instability.
What is the maximum allowable junction temperature for LP38693SDX-5.0 before thermal shutdown activates?
Thermal shutdown for LP38693SDX-5.0 activates at a junction temperature of 160°C (typical), with 10°C hysteresis. Once triggered, the device disables the output until the junction cools to approximately 150°C, at which point regulation resumes automatically. This protection is fully specified across –40°C to 125°C ambient.
Is LP38693SDX-5.0 compatible with 1-µF ceramic output capacitors without additional stabilization components?
Yes. LP38693SDX-5.0 is explicitly designed and characterized for stability with 1-µF ceramic output capacitors (X5R/X7R, ESR < 500 mΩ). The datasheet confirms this in Section 1 (Features) and Section 9.2.2.3, eliminating the need for series resistors or larger bulk capacitance - a key advantage over older LDO architectures.
LP38693SDX-5.0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 6-WDFN Exposed Pad
- 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:
- -
- 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)
LP38693SDX-5.0 FAQ
1.How can I place an order for LP38693SDX-5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP38693SDX-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 LP38693SDX-5.0 reliable?
The price and inventory of LP38693SDX-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 LP38693SDX-5.0 is usually 5 days.
3.What payment methods are accepted for LP38693SDX-5.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP38693SDX-5.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP38693SDX-5.0?
LP38693SDX-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP38693SDX-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 LP38693SDX-5.0?
For technical support, including LP38693SDX-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP38693SDX-5.0 requirements.
6.How does Aetrix verify that LP38693SDX-5.0 is sourced from the original manufacturer or authorized distributors?
All LP38693SDX-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 LP38693SDX-5.0 meets industry standards.
7.What is the process for return or replacement of LP38693SDX-5.0?
All LP38693SDX-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LP38693SDX-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 LP38693SDX-5.0 part is unused and in its original packaging.
Return procedure for LP38693SDX-5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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