My Inquiry
My Account
Texas Instruments LP38690SDX-5.0
- Part No.:
- LP38690SDX-5.0
- Manufacturer:
- Texas Instruments
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
LP38690SDX-5.0.pdf
- Description:
- IC REG LINEAR 5V 1A 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,827
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LP38690SDX-5.0 from Texas Instruments is a 5.0 V fixed-output, 1-A low-dropout CMOS linear regulator in WSON-6 package, featuring 2.5% output accuracy at 25°C, 450 mV dropout at 1 A (VOUT = 5 V), and stable operation with only 1 µF ceramic output capacitor. It delivers precision voltage regulation for battery-powered digital systems requiring tight tolerance and low quiescent current.
For engineers reviewing the LP38690SDX-5.0 datasheet, LP38690SDX-5.0 pinout, LP38690SDX-5.0 application, or LP38690SDX-5.0 equivalent, this page provides verified technical context, validated pin functions for the WSON-6 variant, confirmed thermal and electrical specifications across –40°C to 125°C, and real-world implementation guidance for portable instrumentation and notebook power rails.
Technical Context
The LP38690SDX-5.0 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 trimmed bandgap reference and internal feedback network ensure ±2.5% output accuracy over temperature and line/load conditions.
It integrates foldback current limiting (1500 mA at VIN–VOUT < 4 V; 450 mA at VIN–VOUT > 5 V) and thermal shutdown activation at 160°C with 10°C hysteresis. Unlike the LP38692, it lacks an enable pin and operates continuously when powered within 2.7 V to 10 V input range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±2.5% at 25°C; maintains regulation across –40°C to 125°C junction temperature. |
| Max Output Current | 1 A continuous; limited by thermal design-RθJA = 50.6°C/W in WSON-6 package. |
| Dropout Voltage | 450 mV typical at 1 A and 5 V output; enables operation with VIN as low as 5.45 V under full load. |
| Quiescent Current | 55 µA typical at full load; remains below 100 µA across full temperature and load range. |
| Input Voltage Range | 2.7 V to 10 V; no UVLO circuit-regulation begins only when VIN ≥ (VOUT + VDO) or 2.7 V, whichever is higher. |
| Stability | Stable with ≥1 µF ceramic output capacitor; SNS pin supports remote sensing in WSON-6 variant. |
| Thermal Shutdown | Activates at 160°C junction temperature; recovers at ~150°C; protects against sustained overload. |
Pinout & Package
LP38690SDX-5.0 is supplied in a 6-pin WSON (NGG) package (3.00 mm × 3.00 mm, 0.8 mm height) with exposed thermal pad (DAP) on bottom. The DAP must be soldered to a PCB copper plane for effective thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pins 1, 6) | Input supply connection | Both pins must be tied together externally; each rated for ≤500 mA-enables full 1-A operation with parallel routing. |
| OUT (Pin 4) | Regulated output node | Delivers fixed 5.0 V; connects directly to load and output capacitor; requires ≥1 µF ceramic capacitor for stability. |
| GND (Pin 2) | Circuit ground reference | Reference for internal circuitry and feedback; thermally connected to die-must be routed to large copper area. |
| SNS (Pin 5) | Output voltage sense input | WSON-only; ties directly to load point to compensate for PCB trace IR drop-improves load regulation accuracy. |
| DAP (Exposed Pad) | Thermal interface | Not electrically connected; soldered to PCB thermal plane to reduce RθJB to 24.9°C/W and sustain full current at high ambient. |
Key Features
| Feature | Design Value |
|---|---|
| PMOS Pass Transistor | Eliminates DC base drive current-keeps ground pin current ≤100 µA regardless of load, input, or temperature. |
| Ceramic-Capacitor Stability | Operates stably with ≥1 µF X5R/X7R ceramic output capacitor-reduces BOM cost and board space vs. tantalum. |
| Wide Temperature Range | Specified from –40°C to 125°C junction temperature-supports industrial and automotive under-hood applications. |
| Foldback Current Limit | Adaptive protection: limits to 1500 mA at low VIN–VOUT (<4 V), 450 mA at high differential (>5 V)-prevents thermal runaway during short-circuit. |
| Remote Sensing (SNS) | Compensates for up to ~50 mV trace drop between regulator and load-maintains ±2.5% accuracy at point-of-load. |
Applications
| Hard Disk Drive Power Rail | Notebook Core Logic Supply |
|---|---|
Use Scenario: Powers 5-V logic interfaces and servo control circuitry in 2.5-inch HDDs where space and thermal headroom are constrained. IC Role / Device Role / Timing Role: Primary LDO delivering clean, regulated 5.0 V from shared 7–9 V intermediate rail. Use Value: 450 mV dropout enables efficient operation near battery end-of-life; 1 µF ceramic stability reduces component count and improves reliability. |
Use Scenario: Supplies 5-V I/O rails for USB controllers, card readers, and display interfaces in ultrabooks with aggressive thermal budgets. IC Role / Device Role / Timing Role: Fixed-output post-regulator converting buck converter output to precise 5.0 V for noise-sensitive peripherals. Use Value: 2.5% accuracy ensures compliance with USB 2.0 VBUS tolerance; low 55 µA ground current minimizes system standby power loss. |
| Battery-Powered Portable Instrumentation | Industrial Sensor Node Power |
Use Scenario: Provides stable 5.0 V to ADCs, op-amps, and microcontroller peripherals in handheld multimeters and data loggers. IC Role / Device Role / Timing Role: Precision analog supply rail isolating sensitive signal chain from noisy digital domains. Use Value: 0.7 µV/√Hz output noise (10 Hz–10 kHz) preserves SNR in 16-bit measurement systems; remote sensing maintains accuracy across flex PCB traces. |
Use Scenario: Powers 5-V RS-485 transceivers and isolated sensor front-ends in factory-floor nodes operating at 85°C ambient. IC Role / Device Role / Timing Role: High-reliability local regulator delivering fault-tolerant 5.0 V from wide-input DC-DC stage. Use Value: Thermal shutdown (160°C) and foldback current limit protect against sustained overloads in unventilated enclosures; –40°C to 125°C rating ensures field longevity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLS850F0TESA1 | 5.0 V, 500 mA, integrated watchdog and reset; higher quiescent current (30 µA typ); TO-263-7 package. | Designed for automotive ASIL-B safety-critical systems; includes diagnostic features absent in LP38690SDX-5.0. | Select when functional safety monitoring or reset generation is required-tradeoff is lower current rating and larger footprint. |
| MCP1826T-5002E/DB | 5.0 V, 1 A, 600 mV dropout at 1 A; 1.5% initial accuracy; SOT-223-3 package; no SNS pin. | Higher dropout and no remote sensing-less suitable for long-trace or low-headroom designs-but offers tighter initial tolerance. | Choose for cost-sensitive industrial applications where layout allows direct output placement and 600 mV dropout is acceptable. |
Compared with TLS850F0TESA1 and MCP1826T-5002E/DB, the LP38690SDX-5.0 uniquely balances ultra-low dropout (450 mV), remote sensing capability, and WSON-6 compactness-making it optimal for space-constrained, high-accuracy 5-V rails where enable control is unnecessary.
Availability
LP38690SDX-5.0 is available at Aetrix Electronics and suitable for hard disk drives, notebook computers, battery-powered devices, and portable instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LP38690SDX-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 specializing in analog and embedded processing technologies, with leadership in power management ICs for industrial, automotive, and computing markets.
The LP38690 series belongs to TI's precision low-dropout linear regulator product line, engineered for high-accuracy, low-noise, ceramic-capacitor-stable voltage regulation in portable and thermally demanding applications.
FAQ
What is the dropout voltage specification for LP38690SDX-5.0 at full load?
The LP38690SDX-5.0 has a typical dropout voltage of 450 mV at 1 A output current and 5 V output voltage. At –40°C to 125°C, the maximum dropout is 800 mV under those same conditions. This allows the device to maintain regulation with input as low as 5.8 V at full load, making it suitable for battery-powered systems nearing end-of-discharge.
Does LP38690SDX-5.0 include an enable pin?
No, LP38690SDX-5.0 does not have an enable (EN) pin. It is a permanently enabled regulator-operation begins whenever input voltage exceeds the minimum operating threshold (~2.7 V). In contrast, the LP38692 variant includes an EN pin for external on/off control.
Can LP38690SDX-5.0 be used with a 1-µF output capacitor?
Yes, LP38690SDX-5.0 is explicitly designed and characterized for stability with a minimum 1-µF ceramic output capacitor (X5R or X7R dielectric). This eliminates the need for larger, more expensive tantalum or aluminum electrolytic capacitors and simplifies layout in space-constrained designs.
What is the function of the SNS pin on LP38690SDX-5.0?
The SNS (sense) pin on LP38690SDX-5.0-available only in the WSON-6 package-is connected directly to the load to enable remote voltage sensing. It compensates for resistive losses in PCB traces between the regulator and load, ensuring the output voltage at the load remains within ±2.5% accuracy even with trace drops up to ~50 mV.
Is thermal pad (DAP) connection required for LP38690SDX-5.0?
Yes, the exposed thermal pad (DAP) on the underside of the LP38690SDX-5.0 WSON-6 package must be soldered to a PCB copper plane. Without this connection, junction-to-board thermal resistance rises from 24.9°C/W to >50°C/W, severely limiting safe operating current-especially above 60°C ambient.
LP38690SDX-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):
- 0.8V @ 1A
- Current - Output:
- 1A
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-WSON (3x3)
LP38690SDX-5.0 FAQ
1.How can I place an order for LP38690SDX-5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP38690SDX-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 LP38690SDX-5.0 reliable?
The price and inventory of LP38690SDX-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 LP38690SDX-5.0 is usually 5 days.
3.What payment methods are accepted for LP38690SDX-5.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP38690SDX-5.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP38690SDX-5.0?
LP38690SDX-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP38690SDX-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 LP38690SDX-5.0?
For technical support, including LP38690SDX-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP38690SDX-5.0 requirements.
6.How does Aetrix verify that LP38690SDX-5.0 is sourced from the original manufacturer or authorized distributors?
All LP38690SDX-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 LP38690SDX-5.0 meets industry standards.
7.What is the process for return or replacement of LP38690SDX-5.0?
All LP38690SDX-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LP38690SDX-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 LP38690SDX-5.0 part is unused and in its original packaging.
Return procedure for LP38690SDX-5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP38690SDX-5.0 Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
