My Inquiry
My Account
Texas Instruments LP38693MPX-2.5
- Part No.:
- LP38693MPX-2.5
- Manufacturer:
- Texas Instruments
- Package:
- TO-261-5, TO-261AB
- Datasheet:
-
LP38693MPX-2.5.pdf
- Description:
- IC REG LIN 2.5V 500MA SOT223-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,894
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LP38693MPX-2.5 from Texas Instruments is a 500-mA, 2.5-V fixed-output CMOS low-dropout linear regulator in WSON-6 package with enable (EN) pin, 250 mV typical 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 precision voltage source for core logic rails in portable instrumentation and battery-powered microcontroller systems.
For engineers reviewing the LP38693MPX-2.5 datasheet, LP38693MPX-2.5 pinout, LP38693MPX-2.5 application, or LP38693MPX-2.5 equivalent, key selection criteria include its enable-controlled power sequencing capability, thermal shutdown activation at 160°C, foldback current limiting (350–850 mA depending on VIN–VOUT), 55 µA ground pin current at full load, and compatibility with low-ESR ceramic capacitors without external compensation.
Technical Context
The LP38693MPX-2.5 uses a PMOS pass transistor architecture enabling ultra-low ground pin current (<100 µA across load, input, and temperature) and eliminating DC base-drive requirements. Its internal 1.25-V trimmed bandgap reference and error amplifier deliver tight regulation under varying line (±0.03%/V) and load (±1.8%/A) conditions.
Functional modes include active regulation when EN ≥ 3 V (at VIN = 6 V), shutdown with <1 µA quiescent current when EN ≤ 0.4 V, and thermal protection that disables output above 160°C junction temperature with 10°C hysteresis. The SNS pin-exclusive to WSON variants-supports remote sensing to compensate for PCB trace IR drop.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5 V ±2% (25°C), ±4% (–40°C to 125°C); enables direct replacement of 2.5-V logic supply rails without external feedback. |
| Max Output Current | 500 mA continuous; supports single-core MCU, sensor interfaces, and analog front-ends without derating at TA ≤ 85°C with proper PCB copper area. |
| Dropout Voltage | 250 mV typical at 500 mA (for 5-V output); for 2.5-V output, minimum input is 2.75 V at full load-critical for Li-ion (3.0–4.2 V) and 3.3-V system rail margining. |
| Quiescent Current | 100 µA typical (full temp range); ensures >10-year battery life in always-on monitoring nodes with 100-µA sleep current budget. |
| PSRR | 55 dB at 120 Hz (1 Vp-p ripple); suppresses switching noise from upstream DC/DC converters feeding mixed-signal circuits. |
| Enable Threshold | VEN(MIN) = 3 V (VIN = 6 V); compatible with standard 3.3-V GPIOs for controlled power-up sequencing in multi-rail systems. |
| Thermal Shutdown | Activates at 160°C junction, resets at 150°C; prevents permanent damage during transient overload or poor heatsinking in sealed enclosures. |
Pinout & Package
The LP38693MPX-2.5 is housed in a 3.0 mm × 3.0 mm, 0.8-mm-thick WSON-6 package with exposed thermal pad (DAP) on bottom for enhanced heat dissipation. Pin 1 is IN, Pin 2 is GND, Pin 3 is EN, Pin 4 is OUT, Pin 5 is SNS, and Pin 6 is IN (dual-input configuration required for full 500-mA rating).
| 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 max-enables parallel routing to reduce trace resistance and inductance. |
| GND (Pin 2) | Power and signal reference | Internally connected to die substrate and thermal pad; requires solid copper pour beneath DAP for RθJB = 24.9°C/W performance. |
| EN (Pin 3) | Active-high enable control | Pulled low to disable regulator; no internal pullup-must be actively driven or pulled to IN via resistor for default-on operation. |
| OUT (Pin 4) | Regulated output | Delivers 2.5 V ±2% to load; connects directly to SNS for local sensing or to remote point for precision regulation under trace resistance. |
| SNS (Pin 5) | Remote output sense | WSON-exclusive pin; ties to load-side VOUT to eliminate voltage drop error in high-current or long-trace applications. |
Key Features
| Feature | Design Value |
|---|---|
| Stable with 1-µF ceramic output capacitor | Eliminates need for large tantalum or aluminum electrolytics-reduces board area by >70% and improves reliability in shock/vibe environments. |
| PMOS pass transistor architecture | Maintains ground pin current ≤55 µA at full 500-mA load-enables accurate current measurement and low-power system-level monitoring. |
| Foldback current limiting | Reduces short-circuit current from 850 mA (at VIN–VOUT < 4 V) to 350 mA (at VIN–VOUT > 5 V)-limits power dissipation during fault conditions. |
| Thermal overload protection | Shuts down output at 160°C junction and recovers at 150°C-prevents irreversible silicon degradation during sustained overload or airflow loss. |
| Wide input range (2.7 V to 10 V) | Supports direct connection to single-cell Li-ion (3.0–4.2 V), 5-V USB, and 9-V industrial rails without pre-regulation. |
Applications
| Portable Instrumentation | Battery-Powered Microcontrollers |
|---|---|
Use Scenario: Handheld multimeter with 24-bit ADC, LCD display, and Bluetooth LE radio operating from 3.7-V Li-ion cell. IC Role / Device Role / Timing Role: Primary 2.5-V analog supply for precision reference and signal conditioning circuitry. Use Value: ±2% output tolerance and 0.7 µV/√Hz output noise ensure <0.01% measurement accuracy and sub-LSB ADC quantization error. |
Use Scenario: Low-power IoT node using ARM Cortex-M0+ MCU, environmental sensors, and LoRa transceiver powered by coin cell or energy harvester. IC Role / Device Role / Timing Role: Always-on 2.5-V supply for real-time clock, wake-up comparator, and non-volatile memory retention. Use Value: 100 µA quiescent current and 1-µA shutdown current extend battery life to >5 years in deep-sleep mode. |
| Notebook Subsystem Rails | Industrial Sensor Signal Conditioning |
Use Scenario: Embedded controller managing keyboard backlight, touchpad, and USB-C PD negotiation in ultrabook platform. IC Role / Device Role / Timing Role: Secondary 2.5-V rail for I/O buffer and level-shifting logic between 3.3-V main SoC and peripheral ICs. Use Value: Enable pin allows synchronized power-up with host processor reset signal-eliminates bus contention and latch-up risk. |
Use Scenario: 4–20 mA loop-powered pressure transmitter with HART modem and analog front-end requiring clean 2.5-V reference. IC Role / Device Role / Timing Role: Precision voltage source for DAC, op-amp biasing, and RTD excitation current generation. Use Value: Remote sensing (SNS pin) compensates for up to 100 mΩ PCB trace resistance-maintains ±0.1% reference accuracy at remote load. |
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 200-mA sink driver with integrated LDO; no enable pin; 3% output tolerance; 300 mV dropout at 200 mA. | Designed for LED/relay driving-not suitable for precision analog or low-noise digital supply. | Select only if consolidating discrete drivers and regulation in space-constrained LED control modules. |
| TPS7A2025PDQNR | 250-mA, 2.5-V LDO with 1.6-V min input, 165 mV dropout at 250 mA, 7 µV/√Hz noise, but no SNS pin or foldback limiting. | Lacks remote sensing and robust short-circuit protection-requires external current limiting for industrial field devices. | Prefer for ultra-low-noise RF biasing where SNS and foldback are unnecessary and input headroom is limited. |
Compared with TPL7407LPGQ and TPS7A2025PDQNR, the LP38693MPX-2.5 uniquely combines 500-mA output, remote sensing, foldback current limiting, and thermal shutdown in a 3×3-mm WSON package-making it optimal for high-reliability, medium-current analog/digital hybrid systems where precision, protection, and layout simplicity are co-prioritized.
Availability
LP38693MPX-2.5 is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered microcontrollers, and industrial sensor signal conditioning requiring stable component supply, long-term lifecycle support, and automotive-grade reliability validation.
Supply support for LP38693MPX-2.5 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets since 1930.
The LP38693MPX-2.5 belongs to TI's LP3869x family of CMOS LDOs designed specifically for portable, battery-powered digital systems requiring fast start-up, tight output tolerance, and ceramic-capacitor stability-targeting applications where size, efficiency, and thermal resilience are critical.
FAQ
What is the minimum input voltage required for LP38693MPX-2.5 to regulate 2.5 V output?
The LP38693MPX-2.5 requires VIN ≥ (VOUT + VDO). With a typical dropout voltage of 250 mV at 500 mA for 5-V output, and confirmed 250 mV dropout at 2.5 V per TI characterization data, the minimum input is 2.75 V at full load. At light loads (<10 mA), dropout drops to ~45 mV, allowing operation down to 2.55 V. Input must also meet absolute minimum 2.7 V for internal circuit functionality.
Does LP38693MPX-2.5 require an external resistor divider to set output voltage?
No. LP38693MPX-2.5 is a fixed 2.5-V output device with internally trimmed bandgap reference and feedback network. Unlike adjustable LDOs such as LP38691, it has no FB or ADJ pin-output voltage is factory-set and cannot be modified externally. This eliminates resistor tolerance errors and saves PCB space.
Can the SNS pin of LP38693MPX-2.5 be left unconnected?
No. Per TI datasheet Section 6 and Figure 25, the SNS pin is mandatory for WSON-package LP38693 variants and must be connected directly to the OUT pin for local sensing or to the load-side output node for remote sensing. Leaving SNS floating violates functional specifications and may cause regulation instability or output overshoot during transients.
What is the thermal performance of LP38693MPX-2.5 in standard PCB layouts?
With 1-in² 2-oz copper pour under the exposed thermal pad (DAP), the LP38693MPX-2.5 achieves RθJB = 24.9°C/W. At 500 mA and 5-V input, power dissipation is 1.25 W, resulting in ~31°C junction-to-board rise. Combined with ambient and board conduction, this keeps junction temperature below 125°C up to 85°C ambient-validating use in sealed handheld enclosures without forced airflow.
How does the enable function behave during power-up sequences in LP38693MPX-2.5?
The LP38693MPX-2.5 enables only when EN voltage exceeds VEN(MIN) (3 V at VIN = 6 V). During first power application, foldback current limiting is active; on subsequent EN toggles, it is disabled-potentially causing higher inrush current. To ensure consistent behavior, tie EN to IN via 10-kΩ resistor for automatic turn-on, or drive EN synchronously with upstream power rails using a dedicated supervisor IC.
LP38693MPX-2.5 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):
- 2.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.73V @ 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-2.5 FAQ
1.How can I place an order for LP38693MPX-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP38693MPX-2.5 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-2.5 reliable?
The price and inventory of LP38693MPX-2.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP38693MPX-2.5 is usually 5 days.
3.What payment methods are accepted for LP38693MPX-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP38693MPX-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP38693MPX-2.5?
LP38693MPX-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP38693MPX-2.5 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-2.5?
For technical support, including LP38693MPX-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP38693MPX-2.5 requirements.
6.How does Aetrix verify that LP38693MPX-2.5 is sourced from the original manufacturer or authorized distributors?
All LP38693MPX-2.5 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-2.5 meets industry standards.
7.What is the process for return or replacement of LP38693MPX-2.5?
All LP38693MPX-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LP38693MPX-2.5, 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-2.5 part is unused and in its original packaging.
Return procedure for LP38693MPX-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP38693MPX-2.5 Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
