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Texas Instruments LP38691SDX-5.0
- Part No.:
- LP38691SDX-5.0
- Manufacturer:
- Texas Instruments
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
LP38691SDX-5.0.pdf
- Description:
- IC REG LINEAR 5V 500MA 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,354
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Product details
Overview
LP38691SDX-5.0 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 - used for powering core logic in notebook computers and portable instrumentation.
For engineers reviewing the LP38691SDX-5.0 datasheet, LP38691SDX-5.0 pinout, LP38691SDX-5.0 application, or LP38691SDX-5.0 equivalent, key selection considerations include dropout voltage under 500-mA load, thermal performance in compact WSON layout, remote sense capability (SNS pin), enable functionality absence, and compatibility with low-ESR ceramic capacitors without external compensation.
Technical Context
The LP38691SDX-5.0 uses a PMOS pass transistor architecture enabling ultra-low ground pin current (55 µA typical at full load) and eliminating base-drive losses. Its trimmed bandgap reference and internal feedback network deliver tight DC regulation without external resistors.
It operates across 2.7 V to 10 V input range, supports –40°C to 125°C junction temperature, and integrates foldback current limiting (350 mA min / 850 mA max depending on VIN–VOUT differential) and thermal shutdown activation at 160°C with 10°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±2% over full temperature and load range - eliminates need for external feedback divider and ensures consistent MCU/core rail compliance. |
| Max Output Current | 500 mA continuous - sufficient for single-core processors, FPGA I/O banks, or sensor signal chains in space-constrained designs. |
| Dropout Voltage | 250 mV typical at 500 mA, 5 V out - enables operation from single-cell Li-ion (3.0 V min after discharge) or 5.5 V system rails with margin. |
| Quiescent Current | 55 µA typical at full load - maintains efficiency during active operation without sacrificing regulation fidelity. |
| Input Voltage Range | 2.7 V to 10 V - supports wide-input industrial supplies and battery-backed systems without pre-regulation. |
| Thermal Shutdown | Activates at 160°C junction, releases at 150°C - protects against sustained overload while allowing brief transient handling. |
| PSRR | 55 dB at 120 Hz - suppresses ripple from switching pre-regulators or noisy DC/DC stages feeding the LDO input. |
Pinout & Package
LP38691SDX-5.0 is housed in a 3.0 mm × 3.0 mm, 6-pin WSON package 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 for rated thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pins 1, 6) | Input supply connection | Two parallel IN pins - each rated for ≤250 mA; must be shorted externally to support full 500 mA operation and minimize trace inductance. |
| OUT (Pin 3) | Regulated output | Main power delivery node; connects directly to load and output capacitor; requires low-inductance routing for stability. |
| SNS (Pin 5) | Remote output sense | Enables Kelvin sensing at load point - cancels IR drop in PCB traces; must be tied directly to load-side OUT node. |
| GND (Pin 2) | Power ground reference | Primary return path for load current; ties internally to die substrate and thermal pad - critical for noise and thermal integrity. |
| DAP (Exposed Pad) | Thermal interface | Not electrically connected; functions solely as heatsink - requires ≥80% solder coverage to inner-layer copper pour for RθJB = 24.9°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| Stable with 1-µF ceramic output capacitor | Eliminates need for large tantalum or aluminum electrolytics - reduces board area, cost, and aging-related drift in portable applications. |
| 2% output accuracy over –40°C to 125°C | Guarantees voltage compliance for automotive-grade and industrial embedded systems without calibration or trimming. |
| 55 µA ground pin current at full load | Minimizes system-level inefficiency - especially critical in always-on battery-powered subsystems where quiescent loss dominates. |
| WSON-6 thermal resistance (RθJB = 24.9°C/W) | Enables 500-mA operation at up to 85°C ambient with minimal copper area - suitable for dense handheld PCB layouts. |
| Foldback current limiting | Reduces fault current during short-circuit or low-VIN conditions - limits power dissipation and prevents thermal runaway. |
Applications
| Hard Disk Drive Power Management | Notebook Computer Core Rail |
|---|---|
Use Scenario: Supplies 5.0-V logic and interface circuitry in 2.5-inch HDDs with variable mechanical load and ambient temperature swings. IC Role / Device Role / Timing Role: Primary post-regulator delivering clean, low-noise 5.0-V rail to SATA PHY, spindle motor controller, and buffer memory. Use Value: 250 mV dropout allows direct regulation from 5.5-V system bus; ±2% tolerance ensures SATA compliance under thermal stress. |
Use Scenario: Powers USB hub controllers, audio codecs, and touchpad interfaces in ultraportable notebooks with strict thermal envelope. IC Role / Device Role / Timing Role: Fixed-output LDO providing isolated, low-ripple 5.0-V supply independent of main CPU VRM noise. Use Value: 1-µF ceramic stability reduces BOM count; WSON-6 footprint fits beneath keyboard bezel; 55 µA GND current extends battery runtime. |
| Battery-Powered Portable Instrumentation | Industrial Sensor Signal Chain |
Use Scenario: Powers precision ADCs, op-amps, and microcontrollers in handheld multimeters and data loggers operating from single Li-ion cell. IC Role / Device Role / Timing Role: Low-noise, high-accuracy 5.0-V reference rail generator for analog front-end components. Use Value: 0.7 µV/√Hz output noise preserves SNR; ±2% output ensures calibrated measurement accuracy across temperature. |
Use Scenario: Supplies isolated 5.0-V bias to 4–20 mA transmitter ICs and isolation amplifiers in factory-floor sensors. IC Role / Device Role / Timing Role: Robust local regulator tolerant of 2.7–10 V input transients and EMI-rich industrial environments. Use Value: Foldback current limiting prevents latch-up during cable fault events; thermal shutdown protects against enclosure overheating. |
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 500-mA sink driver with integrated LDO; no SNS pin; higher quiescent current (250 µA) | Designed for LED/relay driving with regulated bias - not a standalone 5.0-V supply | Select only if multi-channel sinking + local 5.0-V bias are required simultaneously; not a drop-in replacement. |
| TPS7A2050PDBVR | 500-mA, 5.0-V LDO in SOT-23-5; 165 mV dropout at 500 mA; no SNS pin; 6.5 µA IQ | Ultra-low IQ variant optimized for always-on battery nodes - lacks remote sensing and WSON thermal performance | Prefer when lowest standby power is critical and trace IR drop is negligible; requires PCB redesign due to different package and pinout. |
Compared with LP38691SDX-5.0, TPL7407LPGQ integrates switching functionality unsuitable for pure regulation, while TPS7A2050PDBVR trades remote sensing and thermal robustness for lower quiescent current - making LP38691SDX-5.0 optimal for thermally demanding, precision-sensing applications requiring Kelvin feedback.
Availability
LP38691SDX-5.0 is available at Aetrix Electronics and suitable for notebook computers, portable instrumentation, and industrial sensor signal chains requiring stable component supply, long-term manufacturability, and AEC-Q100-aligned reliability.
Supply support for LP38691SDX-5.0 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 connectivity solutions for industrial, automotive, and consumer markets.
The LP3869x family was developed specifically for portable, battery-powered digital systems needing fast-startup, high-accuracy, low-noise 5.0-V and adjustable LDO regulation with ceramic capacitor compatibility.
FAQ
What is the maximum output current specification for LP38691SDX-5.0?
The LP38691SDX-5.0 is rated for 500 mA continuous output current under recommended operating conditions. This rating assumes proper PCB thermal design - specifically, soldering the exposed thermal pad (DAP) to ≥80% copper area on an inner layer to achieve the specified RθJB of 24.9°C/W. Derating applies above 85°C ambient.
Does LP38691SDX-5.0 include an enable (EN) pin?
No, LP38691SDX-5.0 does not feature an enable pin. It is a permanently enabled device - power delivery begins whenever VIN exceeds 2.7 V and remains active until VIN drops below the undervoltage lockout threshold. For enable-controlled operation, the LP38693SDX-5.0 variant must be selected instead.
Can LP38691SDX-5.0 operate stably with a 1-µF ceramic output capacitor?
Yes, LP38691SDX-5.0 is explicitly designed and characterized for stability with a single 1-µF ceramic output capacitor (X5R/X7R, ≤500 mΩ ESR). This eliminates the need for larger, less reliable electrolytic or tantalum capacitors and reduces board space - a key advantage confirmed in TI's SNVS321O datasheet Figure 14 and Section 9.2.2.3.
What is the purpose of the SNS pin on LP38691SDX-5.0?
The SNS (sense) pin on LP38691SDX-5.0 enables remote voltage sensing at the load point. It must be connected directly to the load-side output node to compensate for IR drop across PCB traces - ensuring the regulated 5.0 V is maintained precisely at the powered device, not just at the LDO's OUT pin.
Is LP38691SDX-5.0 qualified for automotive applications?
LP38691SDX-5.0 is not AEC-Q100 qualified. For automotive use, TI offers the pin-compatible LP38691-Q1SDX-5.0 variant, which undergoes Grade 1 (–40°C to +125°C) qualification testing and features identical electrical specifications but with enhanced process controls and traceability per AEC standards.
LP38691SDX-5.0 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):
- 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 FAQ
1.How can I place an order for LP38691SDX-5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP38691SDX-5.0 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 reliable?
The price and inventory of LP38691SDX-5.0 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 is usually 5 days.
3.What payment methods are accepted for LP38691SDX-5.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP38691SDX-5.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP38691SDX-5.0?
LP38691SDX-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP38691SDX-5.0 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?
For technical support, including LP38691SDX-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP38691SDX-5.0 requirements.
6.How does Aetrix verify that LP38691SDX-5.0 is sourced from the original manufacturer or authorized distributors?
All LP38691SDX-5.0 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 meets industry standards.
7.What is the process for return or replacement of LP38691SDX-5.0?
All LP38691SDX-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LP38691SDX-5.0, 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 part is unused and in its original packaging.
Return procedure for LP38691SDX-5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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