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Texas Instruments LP38693MPX-ADJ
- Part No.:
- LP38693MPX-ADJ
- Manufacturer:
- Texas Instruments
- Package:
- TO-261-5, TO-261AB
- Datasheet:
-
LP38693MPX-ADJ.pdf
- Description:
- IC REG LIN POS ADJ 500MA SOT223
- Quantity:
- Payment:
- Shipping:
Inventory:1,631
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Product details
Overview
LP38693MPX-ADJ from Texas Instruments is a 500-mA adjustable-output CMOS low-dropout linear regulator with PMOS pass element, enabling stable operation with 1-µF ceramic output capacitors. It delivers 2% ADJ-pin voltage accuracy (1.25 V ±25 mV), 250-mV dropout at 500 mA (VOUT = 5 V), and operates across 2.7 V to 10 V input range - ideal for battery-powered portable instrumentation requiring precise, low-noise bias rails.
For engineers reviewing the LP38693MPX-ADJ datasheet, LP38693MPX-ADJ pinout, LP38693MPX-ADJ application, or LP38693MPX-ADJ equivalent, key selection criteria include enable-controlled shutdown (EN pin), thermal shutdown activation at 160°C, foldback current limiting (350–850 mA depending on VIN–VOUT differential), ground pin current ≤55 µA at full load, and compatibility with ultra-low-ESR ceramic capacitors down to 1 µF.
Technical Context
The LP38693MPX-ADJ uses a PMOS pass transistor architecture, eliminating DC base drive current and ensuring GND-pin current remains below 100 µA across load, temperature, and input voltage variations. Its trimmed bandgap reference enables 2% ADJ-pin voltage accuracy over –40°C to +125°C, supporting precision output setting via external R1/R2 divider (VOUT = VADJ × (1 + R1/R2)).
It integrates foldback current limiting (thresholds shift between 350 mA at VIN–VOUT > 5 V and 850 mA at VIN–VOUT < 4 V), thermal shutdown with 10°C hysteresis (160°C trip, 150°C recovery), and 1-µA off-state quiescent current when EN is pulled low - making it suitable for power-sensitive portable systems with dynamic load and thermal profiles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | 500 mA maximum continuous - supports mid-power digital subsystems without external heatsinking in SOT-223 package. |
| Dropout voltage | 250 mV typical at 500 mA, VOUT = 5 V - enables high-efficiency regulation even near battery end-of-life (e.g., 3.3 V output from 3.55 V Li-ion). |
| ADJ pin voltage | 1.25 V ±25 mV (2%) at 25°C - sets output accuracy baseline; enables 1.25 V to 9 V adjustable range using external resistors. |
| Quiescent current | 55 µA typical at full load - ensures minimal static power loss in always-on bias rails. |
| Enable threshold | VEN(ON) ≥1.8 V (VIN = 4 V), VEN(OFF) ≤0.4 V - compatible with standard 3.3 V/1.8 V logic interfaces. |
| Thermal shutdown | Activates at 160°C junction temperature with 10°C hysteresis - protects against sustained overload without requiring external thermal management. |
| Noise density | 0.7 µV/√Hz (10 Hz–10 kHz) - low enough for analog sensor front-ends and RF biasing where supply ripple must be minimized. |
Pinout & Package
SOT-223 (5-pin) package with exposed thermal pad (DAP) - thermally optimized for high ambient operation; IN and OUT pins support direct PCB copper pour connection for enhanced heat dissipation and low-impedance power routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 4) | Input supply connection | Accepts 2.7 V–10 V input; dual IN pads in WSON variant not applicable - this SOT-223 version has single IN pin. |
| OUT (Pin 3) | Regulated output node | Delivers adjustable voltage (1.25–9 V); requires local 1-µF ceramic capacitor for stability. |
| GND (Pin 5) | Circuit and thermal reference | Low-impedance ground return; thermally connected to die - must be soldered to large copper plane for thermal performance. |
| EN (Pin 1) | Logic-controlled enable input | Active-high control: drives ON when ≥1.8 V (VIN = 4 V); pulls output to high-impedance OFF state when ≤0.4 V. |
| ADJ (Pin 2) | Feedback reference node | Connects to R1/R2 divider; senses 1.25 V reference to set VOUT; leakage <100 nA ensures minimal divider error. |
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 portable designs. |
| PMOS pass transistor architecture | Enables <100 µA GND-pin current regardless of load or temperature - critical for battery runtime optimization in always-on monitoring circuits. |
| Enable (EN) pin with logic-level thresholds | Supports direct interfacing to microcontroller GPIOs without level-shifting - simplifies power sequencing in multi-rail embedded systems. |
| Foldback current limiting | Reduces short-circuit current to 350 mA when VIN–VOUT > 5 V - limits power dissipation during fault conditions without external current-sense circuitry. |
| –40°C to +125°C guaranteed operation | Validated across full industrial temperature range - suitable for automotive cabin electronics and industrial edge sensors without derating. |
Applications
| Battery-Powered Portable Instrumentation | Notebook Computer Subsystem Bias |
|---|---|
Use Scenario: Precision analog front-end in handheld multimeters or environmental sensors powered by single-cell Li-ion. IC Role / Device Role / Timing Role: Adjustable LDO providing clean 3.3 V or 5 V rail for ADC reference and op-amp biasing. Use Value: 0.7 µV/√Hz noise and 55 dB PSRR suppress switching noise from shared DC-DC converters, preserving measurement accuracy. |
Use Scenario: Standby power rail for USB controller or touchpad IC during system sleep mode. IC Role / Device Role / Timing Role: Enable-controlled low-quiescent regulator delivering 1.8 V at <100 µA IQ. Use Value: 1-µA off-state current extends battery life during long idle periods without requiring complex power-gating circuitry. |
| Hard Disk Drive (HDD) Servo Control | Industrial PLC I/O Module Power |
Use Scenario: Low-noise bias for voice coil motor driver and read-channel IC in 2.5-inch HDDs. IC Role / Device Role / Timing Role: Regulator supplying 2.5 V to servo amplifier with fast line transient response (<100 µs settling). Use Value: 250-mV dropout allows operation from degraded 3.0 V supply while maintaining tight output regulation under dynamic load steps. |
Use Scenario: Isolated 5 V auxiliary rail for digital isolator and CAN transceiver in DIN-rail mounted PLC modules. IC Role / Device Role / Timing Role: Primary LDO converting 12 V bus to 5 V, with thermal shutdown protecting against enclosure overheating. Use Value: 160°C thermal trip and 10°C hysteresis prevent latch-up during sustained 70°C ambient operation - validated per industrial thermal requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A4700RGWR | 20-V input, 1-A output, 4-µVRMS noise, no EN pin, SOIC-8 package | Higher voltage/current capability but larger footprint and no enable control - suited for fixed-rail lab equipment, not portable battery systems. | Select when ultra-low noise (<4 µVRMS) and higher input voltage (up to 20 V) outweigh size and enable requirements. |
| MCP1826T-ADJ/DC | 500-mA output, 350-mV dropout, no thermal shutdown, SOT-223, 1.2-V min VOUT | Lacks thermal protection and has higher dropout - acceptable only in thermally benign environments with conservative derating. | Select only if cost sensitivity dominates and thermal margin is guaranteed externally; avoid in sealed enclosures or high-ambient deployments. |
Compared with TPS7A4700RGWR and MCP1826T-ADJ/DC, the LP38693MPX-ADJ uniquely balances compact SOT-223 packaging, integrated enable control, thermal shutdown, and ceramic-capacitor stability - making it optimal for portable, thermally constrained, and logic-controlled power applications where reliability and board space are co-prioritized.
Availability
LP38693MPX-ADJ is available at Aetrix Electronics and suitable for battery-powered portable instrumentation, notebook computer subsystem bias, hard disk drive servo control, and industrial PLC I/O module power requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LP38693MPX-ADJ 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 leader specializing in analog, embedded processing, and power management technologies - with decades of expertise in high-reliability linear regulators for industrial and automotive markets.
The LP3869x-ADJ product line was designed specifically for portable, battery-powered digital systems requiring fast start-up, precision output voltage, and ceramic-capacitor compatibility - targeting applications where low quiescent current and thermal robustness are non-negotiable.
FAQ
What is the minimum output capacitor required for stable operation of the LP38693MPX-ADJ?
The LP38693MPX-ADJ is stable with a minimum 1-µF ceramic output capacitor. This value is verified across the full operating temperature range and input voltage span (2.7 V to 10 V). Ceramic types with X7R or X5R dielectrics are strongly recommended due to their stable capacitance vs. voltage and temperature - Z5U/Y5V ceramics are discouraged as they can lose >60% capacitance under bias.
Does the LP38693MPX-ADJ require an input capacitor, and what value is recommended?
Yes, the LP38693MPX-ADJ requires a minimum 1-µF ceramic input capacitor placed within 1 cm of the IN pin and returned to a clean analog ground. This capacitor mitigates input supply impedance and prevents instability during load transients. Larger values (e.g., 4.7–10 µF) improve high-frequency PSRR but are not mandatory for basic stability.
How does the foldback current limiting behave in the LP38693MPX-ADJ during a short-circuit event?
In the LP38693MPX-ADJ, foldback current limiting reduces output current based on VIN–VOUT differential: at VIN–VOUT > 5 V, limit is ~350 mA; at VIN–VOUT < 4 V, limit rises to ~850 mA. During a short-circuit (VOUT ≈ 0 V), the device enters foldback mode at ~350 mA, minimizing power dissipation and preventing thermal runaway - unlike constant-current limiters that sustain full 500 mA into shorts.
Can the LP38693MPX-ADJ be used without connecting the EN pin?
Yes - if enable functionality is not needed, the EN pin of the LP38693MPX-ADJ must be tied directly to the IN pin to ensure permanent ON operation. Leaving EN floating is not allowed, as the pin has no internal pullup or pulldown; uncontrolled voltage may cause erratic output behavior or partial enable states.
What is the guaranteed operating temperature range for the LP38693MPX-ADJ?
The LP38693MPX-ADJ is fully specified and tested across –40°C to +125°C junction temperature. All key parameters - including ADJ pin voltage accuracy (1.2 V to 1.3 V), dropout voltage, load regulation, and thermal shutdown activation - are ensured over this range, making it suitable for under-hood automotive and industrial edge applications.
LP38693MPX-ADJ 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:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 10V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 9V
- 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-ADJ FAQ
1.How can I place an order for LP38693MPX-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LP38693MPX-ADJ 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-ADJ reliable?
The price and inventory of LP38693MPX-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP38693MPX-ADJ is usually 5 days.
3.What payment methods are accepted for LP38693MPX-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP38693MPX-ADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP38693MPX-ADJ?
LP38693MPX-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP38693MPX-ADJ 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-ADJ?
For technical support, including LP38693MPX-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP38693MPX-ADJ requirements.
6.How does Aetrix verify that LP38693MPX-ADJ is sourced from the original manufacturer or authorized distributors?
All LP38693MPX-ADJ 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-ADJ meets industry standards.
7.What is the process for return or replacement of LP38693MPX-ADJ?
All LP38693MPX-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LP38693MPX-ADJ, 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-ADJ part is unused and in its original packaging.
Return procedure for LP38693MPX-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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