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Texas Instruments LMS8117ADT-ADJ
- Part No.:
- LMS8117ADT-ADJ
- Manufacturer:
- Texas Instruments
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
LMS8117ADT-ADJ.pdf
- Description:
- IC REG LINEAR POS ADJ 1A TO252-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,580
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Product details
Overview
LMS8117ADT-ADJ from Texas Instruments is an adjustable-output, 1-A low-dropout linear regulator in SOT-223 package, delivering output voltage from 1.25 V to 13.8 V with ±1% initial accuracy, 1.25-V reference, and dropout as low as 1.1 V at 100 mA - used for post-regulation of DC-DC converters and local power conditioning in embedded systems.
For engineers reviewing the LMS8117ADT-ADJ datasheet, LMS8117ADT-ADJ pinout, LMS8117ADT-ADJ application, or LMS8117ADT-ADJ equivalent, key selection criteria include guaranteed 1-A output current, thermal shutdown and current limiting, minimum 10-µF tantalum output capacitor requirement, and compatibility with LM317-based layouts.
Technical Context
The LMS8117ADT-ADJ implements a Zener-trimmed band-gap reference and series-pass transistor architecture, enabling precise output regulation across 0°C to 125°C. Its ADJUST pin establishes a fixed 1.25-V reference between OUTPUT and ADJUST, allowing programmable voltage via external resistor divider.
It features internal current limiting (1–1.9 A) and thermal shutdown protection, with line regulation ≤0.2% and load regulation ≤0.4%. Dropout voltage remains stable over temperature: 1.15 V typical at 500 mA and 1.25 V max at 1 A, supporting operation with only 2.5 V input for 1.25 V output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1 A continuous - supports microcontroller cores, FPGAs, and analog subsystems without external boost. |
| Reference Voltage | 1.25 V ±1% - enables accurate, resistor-set output from 1.25 V to 13.8 V with minimal calibration effort. |
| Dropout Voltage | 1.15 V @ 500 mA - allows regulation from 3.3-V rails down to 2.15-V outputs, reducing heat vs. older LDOs. |
| Line Regulation | 0.2% max - ensures <±2.5 mV output shift over full input range (up to 15 V), critical for precision analog supplies. |
| Load Regulation | 0.4% max - guarantees <±5 mV variation from no-load to full 1-A load, simplifying dynamic load design. |
| Thermal Shutdown | Active at ~150°C junction - protects against sustained overload or poor PCB heatsinking without external circuitry. |
| Quiescent Current | 5–10 mA - low enough for battery-backed systems while maintaining fast transient response. |
Pinout & Package
SOT-223 (DCY) package: 3-pin surface-mount with exposed thermal pad (pin 4 = OUTPUT tab). Dimensions: 3.50 mm × 6.50 mm × 1.8 mm. Requires minimum 10-µF tantalum output capacitor for stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (ADJUST) | Reference feedback node | Provides 1.25-V reference to ground; sets output via R1/R2 divider; bypassing improves ripple rejection. |
| 2 (OUTPUT) | Regulated power output | Delivers up to 1 A; also serves as thermal pad connection - must be soldered to ≥1 cm² copper for thermal performance. |
| 3 (INPUT) | Unregulated input supply | Accepts up to 20 V; requires 10-µF tantalum input cap if >10 cm from bulk supply to suppress noise and transients. |
Key Features
| Feature | Design Value |
|---|---|
| LM317-compatible pinout | Enables drop-in replacement in legacy designs without PCB revision - same INPUT/OUTPUT/ADJUST layout. |
| Adjustable output range | 1.25 V to 13.8 V with two resistors - eliminates need for multiple fixed-voltage SKUs in multi-rail systems. |
| High ripple rejection | 75 dB @ 120 Hz - achieved by bypassing ADJUST pin; suitable for cleaning switching converter outputs. |
| Stable with low-ESR caps | Works with 0.5–5 Ω ESR tantalum or polymer capacitors - avoids instability issues common with ceramic-only solutions. |
| Precision current regulation | Configurable as constant-current source using single resistor (R = 1.25 V / IOUT) - useful for LED biasing or sensor excitation. |
Applications
| Post-Regulator for DC-DC Converters | Battery-Powered Instrumentation |
|---|---|
|
Use Scenario: Clean 3.3-V supply derived from noisy 5-V buck converter output in portable test equipment. IC Role / Device Role / Timing Role: Final-stage linear regulator providing low-noise, low-ripple power to ADC reference and op-amp rails. Use Value: 75-dB ripple rejection suppresses switching artifacts, enabling 12-bit+ measurement accuracy without added filtering. |
Use Scenario: Power management in handheld gas analyzer with Li-ion battery (3.0–4.2 V) and 2.5-V sensor interface. IC Role / Device Role / Timing Role: Adjustable LDO stepping down battery voltage to stable 2.5 V for precision analog front-end. Use Value: 1.15-V dropout enables >200 mA delivery even at end-of-discharge (3.0 V), extending usable battery life. |
| Microprocessor Core Supply | Programmable Logic Supply |
|
Use Scenario: Local 1.2-V supply for FPGA configuration logic in industrial controller with 3.3-V system rail. IC Role / Device Role / Timing Role: Low-noise, high-PSRR regulator decoupling digital core from shared system power plane. Use Value: ±1% output accuracy and 0.4% load regulation ensure reliable boot and clock domain stability under dynamic current bursts. |
Use Scenario: Configurable 1.8-V/2.5-V/3.3-V supply for CPLD I/O banks in modular PLC backplane. IC Role / Device Role / Timing Role: Single-part solution replacing multiple fixed LDOs via resistor selection during assembly. Use Value: Eliminates BOM complexity and inventory cost while maintaining per-bank voltage compliance per JEDEC standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM317LZ/NOPB | 0.1-A output, TO-92 package, 2-V dropout, ±2% reference accuracy | Lower current, higher dropout, less precision - suitable only for low-power analog sensors or biasing | Select when space-constrained and <100 mA load suffices; not viable for 1-A digital loads. |
| TLV1117-ADJ | 800-mA output, SOT-223, 1.2-V dropout, ±2% reference, no thermal foldback | Lower current rating and reduced protection - requires external thermal monitoring in sustained 800-mA use | Choose for cost-sensitive, lower-current applications where TI's enhanced protection isn't required. |
Compared with LM317LZ/NOPB and TLV1117-ADJ, the LMS8117ADT-ADJ delivers higher output current (1 A), tighter reference accuracy (±1%), and integrated thermal foldback - making it the preferred choice for robust, high-current linear regulation where reliability and precision are critical.
Availability
LMS8117ADT-ADJ is available at Aetrix Electronics and suitable for post-regulation of DC-DC converters, battery-powered instrumentation, and microprocessor core supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LMS8117ADT-ADJ 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 leader designing analog ICs, embedded processors, and connectivity solutions for industrial, automotive, and communications markets.
The LMS8117A family was developed to provide high-accuracy, thermally robust adjustable LDOs for demanding embedded power applications - bridging the gap between legacy LM317 performance and modern low-dropout requirements.
FAQ
What is the minimum output capacitor required for stable operation of the LMS8117ADT-ADJ?
The LMS8117ADT-ADJ requires a minimum 10-µF tantalum capacitor at the output for stability and transient response. Ceramic capacitors alone are insufficient due to ESR requirements (0.5–5 Ω); polymer or tantalum types meet this spec. Using less capacitance risks oscillation or poor load step recovery.
Can the LMS8117ADT-ADJ be used as a constant-current source?
Yes - the LMS8117ADT-ADJ can function as a precision current regulator by connecting a single resistor between OUTPUT and ADJUST pins. The current equals 1.25 V divided by that resistor value (e.g., 125 Ω yields 10 mA). This mode leverages the same 1.25-V reference and is validated in TI's application notes for LED biasing and sensor excitation.
What is the maximum input voltage rating for the LMS8117ADT-ADJ?
The absolute maximum input voltage for the LMS8117ADT-ADJ is 20 V, per TI's SNOS487F datasheet. However, recommended operating conditions limit input to ≤15 V to ensure safe thermal operation and maintain specified electrical characteristics across temperature.
Does the LMS8117ADT-ADJ require an input bypass capacitor?
Yes - TI recommends a 10-µF tantalum capacitor on the INPUT pin, especially when the device is located >10 cm from the main power filter. This reduces high-frequency noise and prevents instability during fast input transients, directly improving PSRR and startup behavior of the LMS8117ADT-ADJ.
How does the ADJUST pin current affect output voltage accuracy in the LMS8117ADT-ADJ?
The ADJUST pin draws 60–120 µA, which introduces a small error in the resistor-divider equation (VOUT = 1.25 × (1 + R2/R1) + IADJ × R2). For R2 ≤ 1 kΩ, this adds <0.12 V error - typically negligible. To minimize impact, keep R1 ≤ 200 Ω and R2 ≤ 1 kΩ, ensuring IADJ contributes <0.5% error in most LMS8117ADT-ADJ designs.
LMS8117ADT-ADJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 15V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 13.8V
- Voltage Dropout (Max):
- 1.25V @ 1A
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 5 mA
- Current - Supply (Max):
- 10 mA
- PSRR:
- 60 ~ 75 dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-252-3
LMS8117ADT-ADJ FAQ
1.How can I place an order for LMS8117ADT-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LMS8117ADT-ADJ 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 LMS8117ADT-ADJ reliable?
The price and inventory of LMS8117ADT-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMS8117ADT-ADJ is usually 5 days.
3.What payment methods are accepted for LMS8117ADT-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMS8117ADT-ADJ transactions.
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4.How is shipping managed for LMS8117ADT-ADJ?
LMS8117ADT-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMS8117ADT-ADJ 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 LMS8117ADT-ADJ?
For technical support, including LMS8117ADT-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMS8117ADT-ADJ requirements.
6.How does Aetrix verify that LMS8117ADT-ADJ is sourced from the original manufacturer or authorized distributors?
All LMS8117ADT-ADJ 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 LMS8117ADT-ADJ meets industry standards.
7.What is the process for return or replacement of LMS8117ADT-ADJ?
All LMS8117ADT-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LMS8117ADT-ADJ, 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 LMS8117ADT-ADJ part is unused and in its original packaging.
Return procedure for LMS8117ADT-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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