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Texas Instruments LP38693SDX-2.5/NOPB
- Part No.:
- LP38693SDX-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
LP38693SDX-2.5/NOPB.pdf
- Description:
- IC REG LINEAR 2.5V 500MA 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,847
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Product details
Overview
LP38693SDX-2.5/NOPB from Texas Instruments is a 2.5 V, 500-mA 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 cores and I/O in portable instrumentation and battery-powered devices.
For engineers reviewing the LP38693SDX-2.5/NOPB datasheet, LP38693SDX-2.5/NOPB pinout, LP38693SDX-2.5/NOPB application, or LP38693SDX-2.5/NOPB equivalent, key selection considerations include dropout performance at 2.5 V output, EN pin logic thresholds across temperature, thermal derating in compact PCB layouts, and compatibility with ultra-low-ESR ceramic capacitors without external compensation.
Technical Context
The LP38693SDX-2.5/NOPB uses a PMOS pass transistor architecture enabling ground pin current ≤55 µA at full load and eliminating base-drive current dependency. Its internal 1.25-V trimmed bandgap reference and error amplifier deliver tight line/load regulation - 0.03%/V line regulation and 1.8%/A load regulation (25°C, VOUT = 2.5 V).
Functional modes are controlled via the EN pin: device enables when VEN ≥ 1.8 V (min, VIN = 4 V), disables when VEN ≤ 0.4 V, with no internal pull-up/down. Thermal shutdown activates at ~160°C junction temperature and hysteresis of 10°C ensures safe recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5 V ±2% (25°C), ±4% over –40°C to 125°C - ensures stable core supply for 2.5-V logic and analog circuitry. |
| Max Output Current | 500 mA - supports single-rail power for mid-complexity MCUs, ADCs, and RF front-ends without external current boosting. |
| Dropout Voltage | 45 mV (typ, 100 mA), 250 mV (typ, 500 mA @ VOUT = 5 V); extrapolated ~110 mV at 500 mA for 2.5 V output - enables operation down to VIN = 2.61 V under full load. |
| Quiescent Current | 55 µA (typ, full load), 1 µA (max, disabled state) - extends battery life in always-on sensor nodes and sleep-mode systems. |
| PSRR | 55 dB @ 120 Hz (VIN = VOUT + 2 V, 1 Vp-p ripple) - suppresses switching noise from upstream DC/DC converters feeding the LDO input. |
| Thermal Shutdown | Activates at 160°C junction temp, recovers at ~150°C - protects against sustained overload or poor heatsinking in sealed enclosures. |
| Enable Threshold | VEN(ON) = 1.8 V (min, VIN = 4 V), VEN(OFF) = 0.4 V (max) - compatible with 1.8-V and 3.3-V GPIO control without level-shifting. |
Pinout & Package
LP38693SDX-2.5/NOPB is housed in a 6-pin WSON package (3.0 mm × 3.0 mm, 0.75 mm height) 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 guidelines.
| 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 current handling and reduces trace inductance in high-frequency noise environments. |
| OUT (Pin 3) | Regulated output | Delivers 2.5 V to load; requires 1-µF ceramic capacitor to GND within 1 cm for stability - eliminates need for tantalum or electrolytic bulk capacitance. |
| GND (Pin 5) | Power and signal reference | Low-impedance return path; connects internally to DAP - must be routed to solid ground plane to minimize noise coupling and thermal resistance. |
| EN (Pin 2) | Enable control input | Active-high logic interface; no internal bias - requires external pull-up to IN or MCU GPIO; enables precise power sequencing in multi-rail systems. |
| SNS (Pin 4) | Remote output sense | Connects directly to load-side VOUT to compensate for PCB trace IR drop - improves regulation accuracy at point-of-load by up to 20 mV under 500-mA load. |
| DAP (Exposed Pad) | Thermal and electrical ground | Internally connected to GND; provides dominant thermal path - must be soldered to ≥200 mm² copper area with ≥4 thermal vias for RθJA ≤ 50.6°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| Stable with 1-µF ceramic output capacitor | Eliminates need for high-ESR tantalum or aluminum electrolytic capacitors - reduces board area by >50% and improves reliability in shock/vibe environments. |
| PMOS pass transistor architecture | Maintains ground pin current ≤55 µA regardless of load, input voltage, or temperature - simplifies current-sense design and minimizes system-level quiescent power. |
| Integrated foldback current limiting | Reduces short-circuit current from ~850 mA (at low VIN–VOUT) to ~350 mA (at high VIN–VOUT) - limits power dissipation during fault conditions without external circuitry. |
| –40°C to 125°C guaranteed operation | Full electrical specifications validated across automotive-grade temperature range - suitable for under-hood, industrial control, and outdoor embedded applications. |
| 1.25-V precision trimmed bandgap reference | Enables ±2% output tolerance at 25°C and tight line/load regulation - meets requirements for ADC reference supplies and precision analog signal chains. |
Applications
| Portable Instrumentation | Battery-Powered IoT Sensors |
|---|---|
Use Scenario: Handheld multimeter with 24-bit sigma-delta ADC, LCD display, and Bluetooth LE radio operating from two AA cells (1.8–3.2 V). IC Role / Device Role / Timing Role: Primary 2.5-V analog and digital supply rail for ADC reference, MCU core, and RF transceiver. Use Value: Ultra-low dropout allows full 500-mA capability down to 2.61 V input, extending usable battery life by 18% compared to 300-mV-dropout alternatives. |
Use Scenario: Wireless environmental node with temperature/humidity sensor, LoRaWAN transceiver, and coin-cell backup (CR2032, 2.0–3.0 V). IC Role / Device Role / Timing Role: Always-on 2.5-V supply for real-time clock, sensor interface, and wake-up controller; enabled only during active measurement cycles. Use Value: 1-µA shutdown current and fast EN turn-on (<10 µs) reduce average system current to <1 µA in deep sleep - enabling 5+ year battery life. |
| Notebook Subsystem Power | Industrial PLC I/O Module |
Use Scenario: USB-C dock auxiliary rail powering FPGA configuration memory, level shifters, and USB PHY at 2.5 V. IC Role / Device Role / Timing Role: Secondary regulated rail derived from 5-V USB PD bus; sequenced after main 3.3-V supply. Use Value: SNS pin enables remote sensing at FPGA VCCIO pins, maintaining ±15 mV regulation despite 80-mΩ PCB trace resistance - preventing configuration errors. |
Use Scenario: DIN-rail mounted programmable logic controller with isolated 2.5-V ADC front-end and CAN transceiver interface. IC Role / Device Role / Timing Role: Isolated 2.5-V supply for precision analog input stage, referenced to isolated ground plane. Use Value: Guaranteed –40°C to 125°C operation and thermal shutdown ensure reliable function in uncooled enclosures exposed to ambient extremes up to 70°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPL7407LPGEDR | 7-channel 200-mA N-channel array; fixed 3.3 V or adjustable; no SNS pin; higher IQ (25 µA typ) | Multi-rail distributed supply vs. single high-current rail; lacks remote sensing and thermal shutdown hysteresis | Select for space-constrained multi-output designs where channel count outweighs single-rail performance needs. |
| TPS7A2025PDQNR | 250-mA, 2.5 V fixed; 165 mV dropout @ 250 mA; 65 µA IQ; WSON-6; no SNS or foldback limiting | Lower current, lower dropout, but no remote sensing or current foldback - suited for ultra-low-power sub-circuits only | Choose when load current ≤250 mA and board layout prevents use of SNS routing; verify thermal margin at full load. |
Compared with TPL7407LPGEDR and TPS7A2025PDQNR, LP38693SDX-2.5/NOPB uniquely delivers 500-mA capability with remote sensing, foldback current limiting, and guaranteed 125°C operation - making it the only option among the three qualified for thermally demanding, high-accuracy single-rail applications.
Availability
LP38693SDX-2.5/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered IoT sensors, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle support, and guaranteed automotive-grade temperature performance.
Supply support for LP38693SDX-2.5/NOPB 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, designing and manufacturing analog ICs, embedded processors, and system-on-chip solutions for industrial, automotive, and consumer markets.
LP38693SDX-2.5/NOPB belongs to TI's LP3869x family of low-noise, ceramic-capacitor-stable LDOs engineered for portable, battery-powered digital systems requiring fast start-up, tight output tolerance, and minimal board space.
FAQ
What is the minimum input voltage required for LP38693SDX-2.5/NOPB to regulate 2.5 V output at 500 mA?
The LP38693SDX-2.5/NOPB requires VIN ≥ (VOUT + VDO). At 500 mA and 2.5 V output, typical dropout is ~110 mV, so minimum VIN is ~2.61 V. Per datasheet Section 7.4, absolute minimum VIN is 2.7 V for full functionality - thus 2.7 V is the guaranteed operational floor across temperature and process variation. Below this, regulation is not ensured.
Can LP38693SDX-2.5/NOPB operate without the SNS pin connected?
Yes - the SNS pin on LP38693SDX-2.5/NOPB must be tied directly to the OUT pin if remote sensing is not used. Leaving it floating is prohibited. When shorted to OUT, LP38693SDX-2.5/NOPB operates in standard local-sensing mode with typical load regulation of 1.8%/A (25°C), sufficient for most non-precision applications.
Does LP38693SDX-2.5/NOPB require an input capacitor, and what value is recommended?
Yes - LP38693SDX-2.5/NOPB requires a minimum 1-µF ceramic capacitor between IN and GND, placed within 1 cm of the IN pin. This is mandatory for stability per Section 9.2.2.3. Larger values (e.g., 4.7–10 µF) improve transient response and PSRR but are not required. Tantalum or film capacitors are acceptable alternatives.
How does the enable pin (EN) behave during power-up of LP38693SDX-2.5/NOPB?
During power-up, LP38693SDX-2.5/NOPB remains disabled until VIN reaches ~2.7 V and EN exceeds its turn-on threshold (≥1.8 V at VIN = 4 V). If EN is tied to VIN, the device enables concurrently with input ramp. Foldback current limiting is active on first enable after VIN application - critical for managing inrush into large output capacitors.
Is LP38693SDX-2.5/NOPB pin-compatible with other members of the LP3869x family?
LP38693SDX-2.5/NOPB shares the same NGG (WSON-6) package and pinout with LP38693 variants (e.g., LP38693SDX-3.3/NOPB), but differs from LP38691 (no EN pin) and TO-252/SOT-223 variants. Pin mapping is identical across all WSON-packaged LP38693 parts - only output voltage and ordering suffix differ.
LP38693SDX-2.5/NOPB 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):
- 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:
- -
- 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-2.5/NOPB FAQ
1.How can I place an order for LP38693SDX-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP38693SDX-2.5/NOPB 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-2.5/NOPB reliable?
The price and inventory of LP38693SDX-2.5/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP38693SDX-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LP38693SDX-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP38693SDX-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP38693SDX-2.5/NOPB?
LP38693SDX-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP38693SDX-2.5/NOPB 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-2.5/NOPB?
For technical support, including LP38693SDX-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP38693SDX-2.5/NOPB requirements.
6.How does Aetrix verify that LP38693SDX-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LP38693SDX-2.5/NOPB 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-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LP38693SDX-2.5/NOPB?
All LP38693SDX-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP38693SDX-2.5/NOPB, 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-2.5/NOPB part is unused and in its original packaging.
Return procedure for LP38693SDX-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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