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Texas Instruments LP38691SDX-5.0/NOPB
- Part No.:
- LP38691SDX-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
LP38691SDX-5.0/NOPB.pdf
- Description:
- IC REG LINEAR 5V 500MA 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:8,159
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Product details
Overview
LP38691SDX-5.0/NOPB from Texas Instruments is a 500-mA, 5.0-V fixed-output CMOS low-dropout linear regulator in WSON-6 package, featuring 250 mV dropout at full load, ±2% output accuracy over –40°C to 125°C, and stable operation with only 1-µF ceramic output capacitor. It delivers regulated power to microcontroller cores and memory subsystems in portable instrumentation.
For engineers reviewing the LP38691SDX-5.0/NOPB datasheet, LP38691SDX-5.0/NOPB pinout, LP38691SDX-5.0/NOPB application, or LP38691SDX-5.0/NOPB equivalent, key selection considerations include dropout voltage at 500 mA, thermal performance in WSON-6, ground pin current under load, enable functionality absence, and remote sense capability exclusion.
Technical Context
The LP38691SDX-5.0/NOPB uses a PMOS pass transistor enabling ultra-low ground pin current (55 µA typical at full load) independent of input voltage or temperature. Its trimmed bandgap reference ensures 2% output accuracy across –40°C to 125°C, and foldback current limiting activates at ~350 mA when VIN–VOUT > 5 V.
No enable pin is present-unlike LP38693 variants-so regulation is always active when VIN ≥ 2.7 V. Remote sensing (SNS) is implemented only in WSON-packaged devices but is internally tied to OUT and not user-accessible on LP38691SDX-5.0/NOPB per functional diagram and pin table.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±2% (ensured over –40°C to 125°C) |
| Max Output Current | 500 mA continuous (thermal-limited; RθJA = 50.6°C/W in WSON) |
| Dropout Voltage | 250 mV typical at 500 mA, 5.0-V output (enables operation down to VIN = 5.25 V) |
| Ground Pin Current | 55 µA typical at full load (enables high-efficiency battery operation) |
| Input Voltage Range | 2.7 V to 10 V (no UVLO; regulation begins only when VIN ≥ VOUT + VDO) |
| Quiescent Current | 100 µA typical (low-noise, low-power biasing for precision analog rails) |
| PSRR | 55 dB at 120 Hz (effective ripple suppression for switching supply post-regulation) |
Pinout & Package
LP38691SDX-5.0/NOPB is housed in a 3.00 mm × 3.00 mm WSON-6 package with exposed thermal pad (DAP) for enhanced heat dissipation. The DAP must be soldered to a PCB copper plane per AN-1187 guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pins 1 & 6) | Input supply connection | Both pins must be shorted externally; each rated for ≤250 mA to support full 500-mA load |
| OUT (Pin 3) | Regulated output node | Delivers stable 5.0 V; requires 1-µF ceramic capacitor to GND for stability |
| GND (Pin 2) | Power and signal reference | Low-impedance return path; thermally connected to die via package tab |
| SNS (Pin 5) | Remote output sense | Internally tied to OUT; not user-accessible-no external connection required |
| DAP (Exposed Pad) | Thermal interface | Must be soldered to ≥1 cm² copper pour for junction-to-board thermal resistance of 24.9°C/W |
Key Features
| Feature | Design Value |
|---|---|
| Stable with 1-µF ceramic output capacitor | Reduces BOM count and board area vs. traditional LDOs requiring ≥10-µF tantalum |
| PMOS pass element architecture | Eliminates base-drive current, fixing ground pin current at ≤100 µA regardless of load or temperature |
| Foldback current limiting | Protects against short-circuit faults by reducing output current as VOUT collapses (e.g., ~350 mA limit at VIN–VOUT > 5 V) |
| Thermal shutdown with hysteresis | Activates at ~160°C junction temp and releases at ~150°C to prevent latch-up during transient overload |
| Ultra-low noise output | 0.7 µV/√Hz (at 3.3 V; scalable to 5.0 V), suitable for ADC reference and RF subsystem rails |
Applications
| Battery-Powered Portable Instrumentation | Notebook Computer Subsystem Rail |
|---|---|
Use Scenario: Powering 16-bit SAR ADC and precision op-amp front-end in handheld multimeter with 3.7-V Li-ion battery. IC Role / Device Role / Timing Role: Primary 5.0-V analog rail regulator delivering low-noise, tightly regulated voltage independent of battery discharge curve. Use Value: Maintains ADC ENOB > 15 bits across 3.0–4.2 V battery range due to 250-mV dropout and 2% tolerance. | Use Scenario: Supplying USB controller and PCIe clock buffer in ultrabook platform with shared 5-V system rail. IC Role / Device Role / Timing Role: Local point-of-load regulator isolating noise-sensitive timing circuits from noisy main 5-V bus. Use Value: 55-dB PSRR at 120 Hz suppresses switching ripple from buck converter feeding main 5-V rail. |
| Industrial Sensor Node MCU Core | Hard Disk Drive Servo Control |
Use Scenario: Regulating 5.0-V core voltage for ARM Cortex-M4 in wireless vibration sensor node operating at –40°C to 85°C. IC Role / Device Role / Timing Role: Always-on LDO powering MCU core and internal ADC/DAC without enable control. Use Value: Guaranteed 2% accuracy and thermal shutdown protection ensure reliable operation across full industrial temperature range. | Use Scenario: Providing clean 5.0-V bias to voice coil motor driver IC in 2.5-inch HDD actuator assembly. IC Role / Device Role / Timing Role: Low-noise, high-PSRR post-regulator stabilizing servo loop supply amid motor commutation transients. Use Value: 0.7 µV/√Hz noise floor prevents jitter-induced tracking errors in closed-loop position control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLS850B0ELVSE | Automotive-grade (AEC-Q100 Grade 0), 500-mA, 5.0-V output, integrated watchdog timer and reset logic | Requires automotive qualification and system monitoring features not present in LP38691SDX-5.0/NOPB | Select when functional safety (ASIL-B) or reset supervision is required beyond basic regulation |
| TPS7A2050PDBVR | Lower quiescent current (6.5 µA), same 5.0-V output, 300-mA rating, no SNS pin, WSON-6 package | Rated for 300 mA only; insufficient for 500-mA continuous loads without thermal derating | Select for ultra-low-power applications where load current ≤300 mA and IQ < 10 µA is critical |
Compared with TLS850B0ELVSE and TPS7A2050PDBVR, LP38691SDX-5.0/NOPB offers higher continuous current (500 mA vs. 300 mA), tighter thermal resistance (50.6°C/W vs. 60.3°C/W), and guaranteed 2% accuracy over full temperature range-making it optimal for industrial instrumentation demanding robust, unqualified LDO performance.
Availability
LP38691SDX-5.0/NOPB is available at Aetrix Electronics and suitable for battery-powered portable instrumentation, notebook computer subsystem rails, and industrial sensor node MCU cores requiring stable component supply with full industrial temperature support.
Supply support for LP38691SDX-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 digital signal processors for industrial, automotive, and consumer applications.
The LP3869x family was developed specifically for portable, battery-powered digital systems requiring fast start-up, tight output tolerance, and ceramic-capacitor stability-targeting hard disk drives, notebooks, and portable instrumentation.
FAQ
What is the maximum continuous output current for LP38691SDX-5.0/NOPB?
The LP38691SDX-5.0/NOPB supports 500 mA continuous output current when properly heatsinked. Its WSON-6 package has a junction-to-ambient thermal resistance of 50.6°C/W; sustained 500-mA operation at 5.0 V output requires VIN ≤ 7.5 V and ambient temperature ≤ 85°C to avoid thermal shutdown activation at 160°C junction temperature.
Does LP38691SDX-5.0/NOPB include an enable (EN) pin?
No, LP38691SDX-5.0/NOPB does not include an enable pin. Unlike the LP38693 variant, the LP38691 series operates continuously whenever VIN is within specification (2.7 V to 10 V). Regulation begins once VIN reaches VOUT + VDO (≥5.25 V for 5.0-V output), with no external control required.
Can LP38691SDX-5.0/NOPB be used with a 1-µF output capacitor?
Yes, LP38691SDX-5.0/NOPB is explicitly designed for stability with a single 1-µF ceramic output capacitor-no ESR requirements or minimum capacitance beyond this value. This eliminates need for larger, higher-ESR tantalum capacitors and reduces PCB footprint versus legacy LDOs.
What is the dropout voltage specification for LP38691SDX-5.0/NOPB at full load?
The dropout voltage for LP38691SDX-5.0/NOPB is 250 mV typical at 500 mA load current and 5.0-V output. This allows the device to maintain regulation down to VIN = 5.25 V, supporting operation across wide battery discharge ranges in portable equipment.
Is remote sensing (SNS pin) functional on LP38691SDX-5.0/NOPB?
No, the SNS pin on LP38691SDX-5.0/NOPB is internally tied to the OUT pin and not user-accessible. While present in the WSON-6 pinout (Pin 5), it serves no external sensing function-remote voltage feedback is not supported on this variant, unlike certain other members of the LP3869x family.
LP38691SDX-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:
- -
- 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)
LP38691SDX-5.0/NOPB FAQ
1.How can I place an order for LP38691SDX-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP38691SDX-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 LP38691SDX-5.0/NOPB reliable?
The price and inventory of LP38691SDX-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 LP38691SDX-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LP38691SDX-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP38691SDX-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP38691SDX-5.0/NOPB?
LP38691SDX-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP38691SDX-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 LP38691SDX-5.0/NOPB?
For technical support, including LP38691SDX-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP38691SDX-5.0/NOPB requirements.
6.How does Aetrix verify that LP38691SDX-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LP38691SDX-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 LP38691SDX-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LP38691SDX-5.0/NOPB?
All LP38691SDX-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP38691SDX-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 LP38691SDX-5.0/NOPB part is unused and in its original packaging.
Return procedure for LP38691SDX-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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