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Texas Instruments LP38691QSDX-5.0/NOPB
- Part No.:
- LP38691QSDX-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
LP38691QSDX-5.0/NOPB.pdf
- Description:
- IC REG LINEAR 5V 500MA 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,355
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Product details
Overview
LP38691QSDX-5.0/NOPB from Texas Instruments is a 500-mA, 5.0-V fixed-output low-dropout CMOS 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 serves as the primary voltage rail for microcontroller cores in battery-powered instrumentation.
For engineers reviewing the LP38691QSDX-5.0/NOPB datasheet, LP38691QSDX-5.0/NOPB pinout, LP38691QSDX-5.0/NOPB application, or LP38691QSDX-5.0/NOPB equivalent, key selection considerations include dropout voltage at 500 mA, thermal performance in compact WSON layout, remote sense capability (SNS pin), quiescent current under light load, and AEC-Q100 Grade 1 qualification status.
Technical Context
The LP38691QSDX-5.0/NOPB uses a PMOS pass transistor architecture enabling ground pin current ≤55 µA across full load, input voltage (2.7 V–10 V), and temperature (–40°C to 125°C). Its trimmed bandgap reference and internal feedback network deliver 2% initial output tolerance and <0.1%/V line regulation.
No enable pin is present-unlike LP38693 variants-so operation is always active when VIN ≥2.7 V and VIN ≥(VOUT + VDO). The SNS pin supports remote voltage sensing exclusively in WSON packages, eliminating trace IR drop error at the load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±2% (25°C), ±4% (–40°C to 125°C) |
| Max Output Current | 500 mA continuous; foldback current limiting activates at ~350 mA (VIN–VOUT >5 V) or ~850 mA (VIN–VOUT <4 V) |
| Dropout Voltage | 250 mV typical at 500 mA, 5.0-V output; enables regulation down to VIN = 5.25 V |
| Quiescent Current | 55 µA typical at full load; remains ≤100 µA over full temperature range |
| Input Voltage Range | 2.7 V to 10 V; no UVLO-regulation begins only when VIN ≥(VOUT + VDO) or 2.7 V, whichever is higher |
| Thermal Shutdown | Activates at ~160°C junction; hysteresis ~10°C; protects against sustained overload without external heatsink |
| PSRR | 55 dB at 120 Hz (1 Vp-p ripple); sufficient for post-regulation of switching converter outputs |
Pinout & Package
LP38691QSDX-5.0/NOPB is housed in a 6-pin WSON package (3.0 mm × 3.0 mm, 0.8-mm height) with exposed thermal pad (DAP) on bottom for PCB-level heat dissipation. Pin 1 is IN, Pin 2 is GND, Pin 3 is OUT, Pin 4 is IN (redundant input), Pin 5 is SNS, Pin 6 is NC (no internal connection).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pins 1 & 4) | Input supply connection | Both pins must be tied together externally; each rated for ≤250 mA to support full 500-mA operation |
| GND (Pin 2) | Power and signal reference ground | Internally connected to die substrate and thermal pad; requires soldering to large copper plane for thermal management |
| OUT (Pin 3) | Regulated output voltage node | Delivers 5.0 V to load; connects directly to SNS for local sensing or to remote load via dedicated trace for precision regulation |
| SNS (Pin 5) | Remote output voltage sense input | Enables closed-loop regulation at load point; must be connected to load-side of output trace-bypasses PCB trace resistance error |
| NC (Pin 6) | No internal connection | Not bonded; must remain unconnected or grounded per layout guidelines to avoid parasitic coupling |
Key Features
| Feature | Design Value |
|---|---|
| Stable with 1-µF ceramic output capacitor | Eliminates need for larger, higher-ESR tantalum or aluminum electrolytic capacitors-reduces board area and cost |
| PMOS pass transistor architecture | Maintains ground pin current ≤55 µA regardless of load, input voltage, or temperature-critical for battery runtime |
| Remote sense (SNS) capability | Compensates for up to 100 mΩ trace resistance between regulator and load, preserving ±2% output accuracy at point-of-load |
| AEC-Q100 Grade 1 qualified | Rated for operation from –40°C to +125°C ambient-suitable for automotive infotainment and ADAS power rails |
| Foldback current limiting | Reduces short-circuit current as output collapses-limits power dissipation during fault conditions and eases thermal design |
Applications
| Hard Disk Drive Power Management | Notebook Computer Core Rail |
|---|---|
Use Scenario: Supplies 5.0-V bias to HDD spindle motor driver ICs and servo control logic during spin-up and seek operations. IC Role / Device Role / Timing Role: Primary LDO delivering stable 5.0-V rail with fast transient response to handle 300-mA load steps within 10 µs. Use Value: 250-mV dropout enables operation from 5.25-V source-maximizing efficiency while maintaining regulation during brownout events. |
Use Scenario: Powers USB controller, audio codec, and embedded security module in ultrabook platforms with tight thermal envelopes. IC Role / Device Role / Timing Role: Fixed-output LDO providing noise-sensitive analog and digital subsystems with low-noise (<0.7 µV/√Hz), ripple-rejected 5.0-V supply. Use Value: 55-dB PSRR at 120 Hz suppresses switching noise from upstream DC/DC converters-preventing audible artifacts and data corruption. |
| Battery-Powered Portable Instrumentation | Automotive Infotainment Display Backlight Control |
Use Scenario: Regulates 5.0 V for precision ADC reference buffers and op-amp signal chains in handheld multimeters and oscilloscopes. IC Role / Device Role / Timing Role: Low-drift, low-noise LDO ensuring <±0.5% measurement accuracy over battery discharge cycle (3.0 V–4.2 V input). Use Value: ±2% output tolerance and <0.1%/V line regulation maintain reference stability despite Li-ion voltage sag-eliminating recalibration. |
Use Scenario: Supplies 5.0 V to LED driver ICs controlling LCD backlight brightness in automotive head units operating across cold crank (5.5 V) to load dump (18 V) conditions. IC Role / Device Role / Timing Role: Input-protected LDO handling wide VIN range (2.7 V–10 V) with thermal shutdown-survives automotive transients without external TVS. Use Value: 160°C thermal shutdown and foldback limiting prevent latch-up during sustained overloads-meeting ISO 7637-2 pulse 5a requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPL7407LPGQDRQ1 | 7-channel 500-mA LDO array; 5.0-V channel has 300-mV dropout, ±1.5% accuracy, no SNS pin | Integrated multi-rail solution for space-constrained automotive modules; lacks remote sensing | Select when consolidating multiple rails onto single IC; avoid if point-of-load accuracy >±2% required |
| TPS7A2050PDBVR | 500-mA, 5.0-V LDO in SOT-23-5; 170-mV dropout, ±1% accuracy, 25-µA IQ, no SNS or AEC-Q100 | Ultra-low-IQ solution for always-on sensor nodes; smaller footprint but lower thermal robustness | Select for battery life optimization in non-automotive portable devices; avoid for high-ambient or safety-critical use |
Compared with TPL7407LPGQDRQ1 and TPS7A2050PDBVR, LP38691QSDX-5.0/NOPB uniquely combines AEC-Q100 Grade 1 qualification, remote sense capability, and WSON thermal performance-making it the only choice for automotive-grade 5.0-V point-of-load regulation where trace resistance exceeds 50 mΩ.
Availability
LP38691QSDX-5.0/NOPB is available at Aetrix Electronics and suitable for hard disk drives, notebook computers, battery-powered instrumentation, automotive infotainment systems, and portable test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LP38691QSDX-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 applications.
LP38691QSDX-5.0/NOPB belongs to TI's LP3869x family of low-dropout linear regulators engineered for high-efficiency, low-noise power delivery in space- and thermal-constrained portable and automotive electronics.
FAQ
What is the maximum input voltage rating for LP38691QSDX-5.0/NOPB?
The absolute maximum input voltage for LP38691QSDX-5.0/NOPB is 12 V, but recommended operating range is 2.7 V to 10 V. Exceeding 10 V risks exceeding power dissipation limits and triggering thermal shutdown, especially at high ambient temperatures or without adequate PCB copper pour on the DAP.
Does LP38691QSDX-5.0/NOPB have an enable pin?
No, LP38691QSDX-5.0/NOPB does not include an enable (EN) pin. It operates continuously whenever input voltage is applied and meets minimum operating conditions (VIN ≥2.7 V and VIN ≥VOUT + VDO). This distinguishes it from the LP38693 variant, which features an EN pin for external control.
Can LP38691QSDX-5.0/NOPB be used with a 1-µF output capacitor?
Yes, LP38691QSDX-5.0/NOPB is explicitly designed and characterized for stability with a single 1-µF ceramic output capacitor. This eliminates the need for larger, higher-ESR capacitors and reduces board area-confirmed in TI's SNVS321O datasheet Figure 14 and Section 9.2.2.3.
What is the purpose of the SNS pin on LP38691QSDX-5.0/NOPB?
The SNS (sense) pin on LP38691QSDX-5.0/NOPB enables remote voltage sensing at the load. When connected directly to the load-side of the output trace, it compensates for voltage drop across PCB copper resistance-ensuring ±2% output accuracy is maintained at the point-of-load rather than at the regulator output pin.
Is LP38691QSDX-5.0/NOPB qualified for automotive applications?
Yes, LP38691QSDX-5.0/NOPB is AEC-Q100 Grade 1 qualified (–40°C to +125°C ambient), making it suitable for automotive infotainment, body control modules, and ADAS subsystems. Its thermal shutdown, foldback current limiting, and wide-input operation meet stringent automotive reliability and transient immunity requirements.
LP38691QSDX-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)
LP38691QSDX-5.0/NOPB FAQ
1.How can I place an order for LP38691QSDX-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP38691QSDX-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 LP38691QSDX-5.0/NOPB reliable?
The price and inventory of LP38691QSDX-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 LP38691QSDX-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LP38691QSDX-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP38691QSDX-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP38691QSDX-5.0/NOPB?
LP38691QSDX-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP38691QSDX-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 LP38691QSDX-5.0/NOPB?
For technical support, including LP38691QSDX-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP38691QSDX-5.0/NOPB requirements.
6.How does Aetrix verify that LP38691QSDX-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LP38691QSDX-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 LP38691QSDX-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LP38691QSDX-5.0/NOPB?
All LP38691QSDX-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP38691QSDX-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 LP38691QSDX-5.0/NOPB part is unused and in its original packaging.
Return procedure for LP38691QSDX-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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