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Texas Instruments LP38693MP-1.8
- Part No.:
- LP38693MP-1.8
- Manufacturer:
- Texas Instruments
- Package:
- TO-261-5, TO-261AB
- Datasheet:
-
LP38693MP-1.8.pdf
- Description:
- IC REG LIN 1.8V 500MA SOT223-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,035
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Product details
Overview
LP38693MP-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 voltage rail for microcontroller core supplies in portable instrumentation.
For engineers reviewing the LP38693MP-1.8 datasheet, LP38693MP-1.8 pinout, LP38693MP-1.8 application, or LP38693MP-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 cycling.
Technical Context
The LP38693MP-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 drive the gate of the P-FET to maintain regulation under line and load transients.
Enable functionality is implemented via a dedicated EN pin requiring ≥3 V to fully enable at 6 V input and ≤0.4 V to fully disable; no internal pullup/pulldown exists, mandating external termination. Foldback current limiting activates based on VIN–VOUT differential: ~350 mA limit when ΔV > 5 V, ~850 mA when ΔV < 4 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±2% over –40°C to 125°C; enables direct powering of 1.8-V FPGA I/O or MCU cores without external feedback. |
| Max Output Current | 500 mA continuous; sufficient for single-core ARM Cortex-M7 processors in active mode. |
| Dropout Voltage | 250 mV typical at 500 mA and 5 V output; at 1.8 V output, dropout remains ≤450 mV (full temp range), allowing operation from 2.7-V minimum input. |
| Quiescent Current | 55 µA typical at full load; enables battery runtime extension in always-on sensor nodes. |
| Enable Threshold | VEN(MIN) = 3 V at VIN = 6 V; ensures robust turn-on even with supply droop in multi-rail systems. |
| PSRR | 55 dB at 120 Hz; suppresses switching noise from upstream DC/DC converters feeding the LDO input. |
| Thermal Shutdown | Activates at ~160°C junction; hysteresis of 10°C prevents oscillation during thermal overload. |
Pinout & Package
LP38693MP-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, supporting full 500-mA operation with distributed current path. |
| OUT (Pin 3) | Regulated output | Delivers stable 1.8 V; connects directly to load with minimal trace length to reduce IR drop. |
| GND (Pin 5) | Power ground reference | Low-impedance return path; ties to system ground plane and thermally couples to DAP. |
| EN (Pin 2) | Enable control input | Active-high logic; requires external pull-up or driver; floating state is undefined and must be avoided. |
| SNS (Pin 4) | Remote sense input | WSON-only feature; connects directly to load point to compensate for PCB trace resistance; must tie to OUT if unused. |
| DAP (Exposed Pad) | Thermal and electrical ground | Internally connected to GND; provides primary thermal path to PCB; requires solder mask opening and thermal vias. |
Key Features
| Feature | Design Value |
|---|---|
| Stable with 1-µF ceramic output capacitor | Eliminates need for large tantalum or electrolytic capacitors, reducing board area and cost in space-constrained portable designs. |
| PMOS pass transistor architecture | Keeps ground pin current below 100 µA regardless of load, input voltage, or temperature-critical for precision current-sense applications. |
| Foldback current limiting | Reduces output current as VOUT collapses, protecting downstream circuitry during short-circuit or heavy overload events. |
| Thermal shutdown with hysteresis | Prevents latch-up during transient overloads by cycling off at 160°C and back on at 150°C, enabling self-recovery without system reset. |
| 1-µA off-state quiescent current | Enables true zero-power shutdown mode when EN is pulled low, extending battery life in sleep-state IoT endpoints. |
Applications
| Hard Disk Drive Power Management | Notebook Computer Core Rail |
|---|---|
Use Scenario: Supplies 1.8-V interface voltage for SATA controller PHY and buffer memory in 2.5-inch HDDs. IC Role / Device Role / Timing Role: Primary LDO delivering clean, low-noise 1.8-V rail with fast transient response to handle burst data transfers. Use Value: 55 dB PSRR at 120 Hz rejects ripple from buck converter supplying the LDO input, preventing bit errors during high-speed read/write. | Use Scenario: Powers ARM-based embedded controller managing keyboard, touchpad, and thermal sensors in ultrabook platforms. IC Role / Device Role / Timing Role: Always-on LDO providing regulated 1.8-V supply with 1-µA shutdown current during S3/S4 sleep states. Use Value: 55 µA ground current at full load minimizes impact on shared ground planes, preserving ADC reference integrity in mixed-signal subsystems. |
| Portable Instrumentation Sensor Bias | Battery-Powered Medical Monitor |
Use Scenario: Generates precise 1.8-V bias for low-power MEMS accelerometers and analog front-end amplifiers in handheld oscilloscopes. IC Role / Device Role / Timing Role: Low-noise, high-accuracy LDO ensuring stable sensor excitation and signal chain reference. Use Value: 0.7 µV/√Hz output noise preserves dynamic range of 16-bit sigma-delta ADCs sampling at 10 kSPS. | Use Scenario: Supplies 1.8-V logic rail for Bluetooth LE SoC and display driver in wearable ECG monitors powered by coin-cell batteries. IC Role / Device Role / Timing Role: Enable-controlled LDO enabling firmware-triggered power gating of non-critical subsystems. Use Value: EN pin threshold of 3 V at 6 V input ensures reliable wake-up from deep sleep even as battery voltage declines to 2.8 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLS850F0TES/V33 | Automotive-grade (AEC-Q100 Grade 0), 3.3-V fixed output, higher IQ (30 µA typ), no EN pin | Designed for automotive body electronics; lacks enable control and 1.8-V option | Select only if AEC-Q100 qualification is mandatory and 3.3-V output suffices; not drop-in for LP38693MP-1.8. |
| TPS7A2018PDQNR | 1.8-V fixed, 300-mA output, 165 mV dropout at 300 mA, 6.5-µA IQ, WSON-6 package | Lower current rating and lower dropout, but insufficient for 500-mA loads; optimized for ultra-low-IQ battery apps | Use where load current ≤300 mA and lowest possible quiescent current is critical; verify thermal margin at full load. |
Compared with TLS850F0TES/V33 and TPS7A2018PDQNR, the LP38693MP-1.8 uniquely balances 500-mA capability, 1.8-V fixed output, EN control, and WSON-6 thermal performance-making it optimal for industrial portable instruments requiring robust enable sequencing and thermal resilience.
Availability
LP38693MP-1.8 is available at Aetrix Electronics and suitable for hard disk drives, notebook computers, and portable instrumentation requiring stable component supply with guaranteed long-term availability.
Supply support for LP38693MP-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 digital signal processors for industrial, automotive, and consumer applications.
The LP3869x product line delivers high-accuracy, low-dropout linear regulators optimized for battery-powered digital systems requiring fast start-up, ceramic-capacitor stability, and wide input voltage range (2.7 V to 10 V).
FAQ
What is the minimum input voltage required for LP38693MP-1.8 to regulate 1.8 V output?
The LP38693MP-1.8 requires VIN ≥ (VOUT + VDO), where VDO is up to 450 mV across temperature. Thus, minimum VIN is 2.25 V; however, the datasheet specifies 2.7 V as the absolute minimum operating input voltage to ensure full internal circuit functionality. Below 2.7 V, regulation is not guaranteed.
Does LP38693MP-1.8 require an external feedback resistor network?
No. LP38693MP-1.8 is a fixed-output regulator with internally trimmed 1.8-V reference. No external resistors are needed-unlike adjustable LDOs such as LP38691. The SNS pin is optional for remote sensing but does not alter the output voltage setting.
How should the SNS pin be handled in LP38693MP-1.8 if remote sensing is not used?
If remote sensing is not required, the SNS pin (Pin 4) must be connected directly to the OUT pin (Pin 3) on the PCB. Leaving SNS floating violates the datasheet requirement and may cause regulation instability or output voltage error due to uncontrolled node impedance.
What is the thermal performance difference between LP38693MP-1.8 in WSON-6 versus SOT-223 packages?
Per datasheet Table 7.5, LP38693MP-1.8 in WSON-6 has RθJA = 50.6°C/W (High-K), while the SOT-223 variant has RθJA = 68.5°C/W. The WSON-6's lower thermal resistance-enabled by its exposed thermal pad-delivers ~26% better junction-to-ambient heat transfer, allowing higher continuous current in compact layouts.
Can LP38693MP-1.8 be used with input voltages above 10 V?
No. The absolute maximum input voltage for LP38693MP-1.8 is 12 V, but recommended operating VIN is limited to 2.7 V–10 V. Operation above 10 V risks exceeding safe power dissipation limits and may trigger thermal shutdown or degrade long-term reliability-even if within absolute max ratings.
LP38693MP-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
LP38693MP-1.8 FAQ
1.How can I place an order for LP38693MP-1.8 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP38693MP-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 LP38693MP-1.8 reliable?
The price and inventory of LP38693MP-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 LP38693MP-1.8 is usually 5 days.
3.What payment methods are accepted for LP38693MP-1.8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP38693MP-1.8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP38693MP-1.8?
LP38693MP-1.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP38693MP-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 LP38693MP-1.8?
For technical support, including LP38693MP-1.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP38693MP-1.8 requirements.
6.How does Aetrix verify that LP38693MP-1.8 is sourced from the original manufacturer or authorized distributors?
All LP38693MP-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 LP38693MP-1.8 meets industry standards.
7.What is the process for return or replacement of LP38693MP-1.8?
All LP38693MP-1.8 units undergo pre-shipment inspection (PSI). If there is an issue with LP38693MP-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 LP38693MP-1.8 part is unused and in its original packaging.
Return procedure for LP38693MP-1.8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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