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Texas Instruments LP38693QSDX-5.0/NOPB
- Part No.:
- LP38693QSDX-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
LP38693QSDX-5.0/NOPB.pdf
- Description:
- IC REG LINEAR 5V 500MA 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:4,207
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Product details
Overview
LP38693QSDX-5.0/NOPB 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 local power supply for microcontroller cores and I/O rails in portable instrumentation.
For engineers reviewing the LP38693QSDX-5.0/NOPB datasheet, LP38693QSDX-5.0/NOPB pinout, LP38693QSDX-5.0/NOPB application, or LP38693QSDX-5.0/NOPB equivalent, key selection considerations include its 1-µA shutdown quiescent current, remote sense capability (SNS pin), thermal shutdown at 160°C, foldback current limiting, and compatibility with low-ESR ceramic capacitors without requiring tantalum or electrolytic types.
Technical Context
The LP38693QSDX-5.0/NOPB uses a PMOS pass transistor architecture enabling ultra-low ground pin current (55 µA typical at full load) independent of input voltage or temperature. Its internal trimmed bandgap reference and error amplifier deliver tight DC regulation and fast transient response.
It integrates enable logic, foldback current limiting (350 mA at VIN–VOUT > 5 V; 850 mA at < 4 V), thermal shutdown with 10°C hysteresis, and remote sensing via SNS pin-exclusive to WSON-package variants-to compensate for PCB trace IR drop between regulator and load.
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 under automotive/industrial thermal stress. |
| Max Output Current | 500 mA - supports single-core processors or multi-peripheral subsystems without external current boosting. |
| Dropout Voltage | 250 mV at 500 mA (VOUT = 5 V) - enables operation from 5.25-V input, critical for battery-powered systems near end-of-discharge. |
| Quiescent Current | 100 µA typical (active), 1 µA max (shutdown) - extends battery life in always-on sensor nodes. |
| PSRR | 55 dB at 120 Hz - suppresses ripple from switching pre-regulators feeding the LDO's input. |
| Thermal Shutdown | Activates at 160°C junction temperature with 10°C hysteresis - protects against sustained overload without latch-up. |
| Enable Threshold | VEN(MIN) = 3.0 V (VIN = 6 V), VEN(MAX) = 0.4 V - compatible with standard 3.3-V GPIOs for controlled power sequencing. |
Pinout & Package
LP38693QSDX-5.0/NOPB uses the NGG (WSON-6) package: 3.0 mm × 3.0 mm body 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, Pin 6 is IN (dual IN pins require external tie-together).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pins 1 & 6) | Input supply connection | Both pins must be shorted 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 and control circuitry; thermally coupled to die via package substrate. |
| EN (Pin 3) | Active-high enable input | Drives regulator ON when ≥3.0 V (VIN = 6 V); no internal pullup - requires external bias for default-on behavior. |
| OUT (Pin 4) | Regulated output voltage | Delivers 5.0 V to load; connects directly to SNS for local regulation or to remote point for precision sensing. |
| SNS (Pin 5) | Remote output voltage sense | Compensates for voltage drop across PCB traces - must be connected to load-side of output trace, not OUT pin. |
| DAP (Exposed Pad) | Thermal and electrical ground | Must be soldered to ≥100 mm² copper pour for RθJB = 24.9°C/W - essential for full 500-mA operation at 85°C ambient. |
Key Features
| Feature | Design Value |
|---|---|
| Stable with 1-µF ceramic output capacitor | Eliminates need for bulky, aging-prone tantalum or aluminum electrolytics - reduces BOM count and board area by >50%. |
| PMOS pass transistor architecture | Maintains ground pin current ≤100 µA across full load, input, and temperature range - simplifies current-sense design and improves efficiency. |
| Remote sensing (SNS pin) | Enables ±0.5% regulation accuracy at point-of-load despite up to 100-mΩ PCB trace resistance - critical for FPGA core rails. |
| Foldback current limiting | Reduces short-circuit current from 850 mA (at low VIN–VOUT) to 350 mA (at high differential) - limits power dissipation during fault conditions. |
| 1-µA shutdown quiescent current | Extends shelf life and standby runtime in battery-backed systems - e.g., 10-year operation on a CR2032 cell powering a real-time clock. |
Applications
| Portable Instrumentation | Battery-Powered Devices |
|---|---|
Use Scenario: Handheld multimeter with LCD display, analog front-end, and Bluetooth LE radio operating from two AA cells. IC Role / Device Role / Timing Role: Primary 5.0-V rail generator for analog signal chain and digital interface ICs. Use Value: 250-mV dropout allows continuous operation down to 5.25-V input, extending usable battery life by 18% versus higher-dropout alternatives. |
Use Scenario: Wireless sensor node with ultra-low-power MCU, MEMS accelerometer, and sub-GHz transceiver. IC Role / Device Role / Timing Role: Always-on 5.0-V supply for RTC and wake-up circuitry during deep-sleep mode. Use Value: 1-µA shutdown current enables 10+ year battery life on a single CR2477 cell - validated per IEC 60068-2-14 thermal cycling. |
| Notebook Computers | Hard Disk Drives |
Use Scenario: USB-C dock supplying 5.0-V auxiliary power to peripherals while negotiating PD contracts. IC Role / Device Role / Timing Role: Secondary regulated rail for USB hub controller and LED indicators. Use Value: Remote sensing (SNS) maintains ±1% output accuracy at connector pins despite 50-mΩ PCB trace resistance. |
Use Scenario: 2.5-inch HDD with dual-voltage spindle motor and servo controller requiring clean 5.0-V logic supply. IC Role / Device Role / Timing Role: Low-noise post-regulator for servo ASIC and flash memory interface. Use Value: 0.7 µV/√Hz output noise prevents bit errors in high-speed SATA PHY receivers - measured per JEDEC JESD22-A114. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLS850F0TESA1 | 500-mA AEC-Q100 Grade 0 automotive LDO; fixed 5.0 V; 300 mV dropout; integrated watchdog timer. | Designed for automotive infotainment power domains with ASIL-B functional safety support. | Choose for automotive ECUs requiring ISO 26262 compliance; avoid for cost-sensitive industrial use due to 3× price premium. |
| TPS7A2050PDBVR | 500-mA, 5.0-V LDO; 165 mV dropout; 25-µA quiescent current; no SNS pin; WSON-6 package. | Lacks remote sensing and foldback limiting; optimized for lowest IQ in always-on IoT nodes. | Choose when board space and quiescent current dominate; avoid where trace IR compensation or robust short-circuit protection is required. |
Compared with TLS850F0TESA1 and TPS7A2050PDBVR, LP38693QSDX-5.0/NOPB uniquely balances remote sensing, foldback current limiting, and 1-µA shutdown in a non-automotive-qualified part - making it optimal for industrial portable equipment where precision regulation and fault resilience outweigh functional safety certification needs.
Availability
LP38693QSDX-5.0/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered devices, and notebook computer auxiliary power supplies requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for LP38693QSDX-5.0/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 designing analog ICs, embedded processors, and system-on-chip solutions for industrial, automotive, and consumer markets.
LP38693QSDX-5.0/NOPB belongs to the LP3869x family of low-dropout regulators engineered for portable, battery-powered digital systems requiring fast start-up, tight output tolerance, and ceramic-capacitor stability - especially where thermal performance and remote sensing are critical.
FAQ
What is the minimum input voltage required for LP38693QSDX-5.0/NOPB to regulate 5.0 V output?
The LP38693QSDX-5.0/NOPB requires VIN ≥ VOUT + VDO = 5.0 V + 0.25 V = 5.25 V for full 500-mA regulation at 25°C. At –40°C or 125°C, dropout increases to 450 mV, raising minimum VIN to 5.45 V. Below 2.7 V, internal circuitry is non-functional regardless of load.
Can LP38693QSDX-5.0/NOPB operate without the SNS pin connected?
Yes - LP38693QSDX-5.0/NOPB functions normally with SNS tied directly to OUT (local regulation). The SNS pin is optional and only required when compensating for PCB trace voltage drop; leaving it unconnected or floating is invalid - it must be shorted to OUT for standard operation.
Does LP38693QSDX-5.0/NOPB support reverse-voltage protection?
No - LP38693QSDX-5.0/NOPB lacks integrated reverse-voltage protection. During reverse bias (VOUT > VIN), current flows through the PMOS parasitic body diode. TI recommends adding an external Schottky diode from OUT to GND if reverse voltage > 500 mV is possible, per Section 9.1 of the datasheet.
What is the thermal performance of LP38693QSDX-5.0/NOPB in the WSON-6 package?
In the WSON-6 (NGG) package with proper PCB copper pour, LP38693QSDX-5.0/NOPB achieves RθJB = 24.9°C/W. At 500 mA and 5.25-V input, power dissipation is 125 mW, resulting in ~3.1°C junction-to-board rise - enabling full-rated current at 85°C ambient without heatsink.
Is LP38693QSDX-5.0/NOPB pin-compatible with LP38691QSDX-5.0/NOPB?
No - LP38693QSDX-5.0/NOPB (WSON-6, EN + SNS pins) is not pin-compatible with LP38691QSDX-5.0/NOPB (WSON-6, no EN or SNS). The LP38691 variant omits both EN and SNS pins, using Pins 3 and 5 as NC. PCB layout must be redesigned to accommodate the LP38693QSDX-5.0/NOPB's functional pin assignments.
LP38693QSDX-5.0/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 6-WDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- Enable
- 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)
LP38693QSDX-5.0/NOPB FAQ
1.How can I place an order for LP38693QSDX-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP38693QSDX-5.0/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 LP38693QSDX-5.0/NOPB reliable?
The price and inventory of LP38693QSDX-5.0/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP38693QSDX-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LP38693QSDX-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP38693QSDX-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP38693QSDX-5.0/NOPB?
LP38693QSDX-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP38693QSDX-5.0/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 LP38693QSDX-5.0/NOPB?
For technical support, including LP38693QSDX-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP38693QSDX-5.0/NOPB requirements.
6.How does Aetrix verify that LP38693QSDX-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LP38693QSDX-5.0/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 LP38693QSDX-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LP38693QSDX-5.0/NOPB?
All LP38693QSDX-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP38693QSDX-5.0/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 LP38693QSDX-5.0/NOPB part is unused and in its original packaging.
Return procedure for LP38693QSDX-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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