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Texas Instruments LM317LIPWR
- Part No.:
- LM317LIPWR
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM317LIPWR.pdf
- Description:
- IC REG LIN POS ADJ 100MA 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,361
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Product details
Overview
LM317LIPWR from Texas Instruments is a 100mA adjustable floating linear voltage regulator in TSSOP-8 package, delivering output voltages from 1.25V to 37V with ±0.5% typical output regulation and 71.5dB ripple rejection at 120Hz. It operates with only two external resistors, requires no output capacitor for stability, and supports high-voltage floating applications such as solar energy converters and HVAC control circuits.
For engineers reviewing the LM317LIPWR datasheet, LM317LIPWR pinout, LM317LIPWR application, or LM317LIPWR equivalent, this page delivers verified technical context, real-world design meaning for key specs, validated pin functions for the PW package, confirmed alternatives for 100mA adjustable regulator use cases, and supply-chain support details specific to industrial embedded and power management designs.
Technical Context
The LM317LIPWR uses a floating topology that senses only the input-to-output differential voltage-not absolute ground-referenced potentials-enabling operation with input supplies exceeding 100V when differential limits are respected. Its internal NPN Darlington output stage provides low output impedance and eliminates mandatory output capacitance.
Regulation relies on a precision 1.25V reference between OUTPUT and ADJUST pins, with ADJUST current typically 44–57µA (CSO:RFB). Overcurrent and thermal shutdown protection remain active even if the ADJUST pin is disconnected, and line regulation is specified at 0.007% per volt for the RFB fabrication variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | Up to 100mA continuous - sufficient for biasing analog sensors, powering small microcontrollers, or driving LED strings in low-power lighting systems. |
| Output voltage range | 1.25V to 37V adjustable - set precisely via two external resistors; enables flexible rail generation without stock multiple fixed regulators. |
| Reference voltage | 1.256V (typ) between OUTPUT and ADJUST - defines regulation threshold; tolerance directly impacts output accuracy across temperature and load. |
| Ripple rejection | 71.5dB at 120Hz - suppresses AC line noise in unregulated DC supplies, critical for clean analog signal chains and precision measurement front-ends. |
| Input-to-output differential | 2.5V to 37V (max) - determines minimum headroom needed for regulation; dropout behavior begins below 2.5V, limiting ultra-low-voltage applications. |
| Operating junction temp | –40°C to +125°C - qualified for automotive under-hood, industrial motor drives, and outdoor energy systems without derating. |
| Adjust pin current | 44–57µA - flows into feedback network; must be accounted for in resistor selection to avoid output voltage error >1% at high R2 values. |
Pinout & Package
TSSOP-8 (PW) package: 3mm × 6.4mm body, exposed thermal pad (not electrically connected), 0.65mm pitch, surface-mount compatible. Designed for improved thermal performance over TO-92 and higher density than SOIC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (INPUT) | Input supply voltage | Primary power entry point; must exceed OUTPUT by ≥2.5V for regulation; connects to upstream filter capacitor or bulk DC source. |
| 2 (NC) | No internal connection | Not bonded internally; TI recommends grounding for thermal improvement but not required for electrical function. |
| 3 (NC) | No internal connection | Not bonded internally; grounding improves thermal dissipation but does not affect regulation or stability. |
| 4 (ADJUSTMENT) | Feedback voltage sense | Sets output via resistor divider; 1.25V reference referenced to OUTPUT; bias current (44–57µA) flows into this node. |
| 5 (NC) | No internal connection | Not bonded internally; grounding optional for thermal enhancement only. |
| 6 (NC) | No internal connection | Not bonded internally; grounding optional for thermal enhancement only. |
| 7 (OUTPUT) | Regulated output voltage | Delivers stable voltage; all OUTPUT pins (2,3,6,7 in D/PW packages) are internally tied - allows multiple trace routing options. |
| 8 (NC) | No internal connection | Not bonded internally; grounding recommended for thermal path but not electrically necessary. |
Key Features
| Feature | Design Value |
|---|---|
| Floating architecture | Enables high-side or floating regulator configurations - supports >100V input supplies as long as VI–VO ≤ 37V, ideal for telecom and solar MPPT pre-regulators. |
| No output capacitor required | Stable without COUT - reduces BOM count and board space; optional COUT improves transient response for dynamic loads like ADC references or RF modules. |
| 1.25V precision reference | 1.256V ±0.036V (CSO:RFB) - enables <1% output error with standard 1% resistors; drift <10mV/V over –40°C to +125°C ensures stable calibration in harsh environments. |
| Integrated protection | Thermal shutdown and current limiting remain fully functional even with ADJUST pin open - prevents latch-up or destruction during fault conditions like shorted outputs. |
| Low quiescent current | ADJUST pin current ≤57µA - minimizes power loss in battery-powered systems and avoids significant error in high-resistance feedback networks. |
Applications
| Solar Energy Converter | HVAC Control Module |
|---|---|
|
Use Scenario: Regulates auxiliary 5V/12V rails from variable PV array output (20–60V) in off-grid inverters and charge controllers. IC Role / Device Role / Timing Role: Floating linear regulator providing isolated, low-noise bias for MCU, gate drivers, and sensor interfaces. Use Value: Maintains stable output despite wide input swings and high ambient temperatures (up to +125°C junction), eliminating need for complex switching solutions in low-power auxiliary domains. |
Use Scenario: Powers analog temperature/humidity sensors, valve actuators, and communication ICs in duct-mounted HVAC units. IC Role / Device Role / Timing Role: Adjustable voltage source generating precise 3.3V or 5V rails from 24VDC HVAC bus. Use Value: Delivers <0.5% regulation and 71.5dB ripple rejection to ensure accurate sensor readings and reliable RS-485 transceiver operation in electrically noisy HVAC environments. |
| Optical Network Terminal (ONT) | Analog Input Module |
|
Use Scenario: Supplies clean 3.3V for GPON/EPON PHY ICs and laser driver bias in fiber-to-the-home ONT units. IC Role / Device Role / Timing Role: Low-noise post-regulator following bulk DC/DC conversion, filtering switching ripple before sensitive analog stages. Use Value: 71.5dB ripple rejection at 120Hz and optional CADJ capacitor enable sub-mV ripple on 3.3V rail - critical for minimizing bit error rates in optical receivers. |
Use Scenario: Generates programmable excitation voltage (e.g., 2.5V, 5V, 10V) for precision RTD or strain gauge bridges in industrial data acquisition systems. IC Role / Device Role / Timing Role: Programmable reference voltage source with matched temperature coefficient to bridge sensors. Use Value: Output voltage drift <10mV/V over –40°C to +125°C ensures stable bridge excitation, preserving <0.1% measurement accuracy without recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM317LIDR | SOIC-8 package; RθJA = 98.18°C/W (vs. 149.4°C/W for LM317LIPWR); same electrical specs and CSO:RFB silicon. | Better thermal performance in PCB-constrained layouts; preferred where board space permits larger footprint and airflow is limited. | Select LM317LIDR when thermal management is prioritized over board area; LM317LIPWR suits high-density TSSOP layouts with adequate copper pour. |
| TLV1117-33CDCY | Fixed 3.3V LDO; 800mA output; 1.2V dropout; no adjustment capability; different pinout and topology. | Replaces LM317LIPWR only in fixed-voltage, high-current, low-dropout scenarios - not a functional substitute for adjustable or floating applications. | Choose TLV1117-33CDCY only for dedicated 3.3V rails requiring <1.2V headroom; LM317LIPWR remains essential for programmable or high-differential-voltage use cases. |
Compared with LM317LIDR, LM317LIPWR trades thermal efficiency for compact TSSOP packaging - enabling denser layouts but requiring careful copper thermal relief. Versus TLV1117-33CDCY, LM317LIPWR offers full adjustability and floating operation, making it irreplaceable in solar, HVDC, and precision analog biasing where voltage flexibility and high VI–VO tolerance are mandatory.
Availability
LM317LIPWR is available at Aetrix Electronics and suitable for solar energy converters, HVAC control modules, optical network terminals, and analog input modules requiring stable component supply, long-lifecycle continuity, and guaranteed TI-sourced authenticity.
Supply support for LM317LIPWR 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 specializing in analog, embedded processing, and power management technologies, with decades of expertise in high-reliability linear regulators and industrial-grade ICs.
The LM317L product line was designed specifically for cost-sensitive, thermally demanding, and high-input-voltage applications where simplicity, robustness, and floating topology provide decisive advantages over fixed or switching alternatives.
FAQ
What is the maximum input-to-output differential voltage for LM317LIPWR?
The LM317LIPWR supports a maximum input-to-output differential voltage of 37V under recommended operating conditions (CSO:RFB silicon). This limit applies regardless of absolute input voltage - enabling use in floating configurations with inputs exceeding 100V, provided the differential stays within spec. Exceeding 37V risks permanent damage per Absolute Maximum Ratings.
Does LM317LIPWR require an output capacitor to maintain stability?
No, LM317LIPWR does not require an output capacitor for stability - a key advantage over many other linear regulators. An optional 1µF output capacitor can be added to improve transient response for dynamic loads, but it is not necessary for loop stability. The device remains stable with only the recommended 0.1µF input bypass capacitor.
How is output voltage calculated for LM317LIPWR in standard configuration?
LM317LIPWR output voltage is calculated as VOUT = 1.25V × (1 + R2/R1) + IADJ × R2, where IADJ is typically 44–57µA. For most designs using R2 ≤ 10kΩ, the IADJ × R2 term contributes <0.6mV error and is often omitted. The 1.25V reference is measured between OUTPUT and ADJUST pins, not ground - critical for floating implementations.
Can LM317LIPWR be used as a precision current source?
Yes, LM317LIPWR can be configured as a precision current source by connecting a single resistor R between ADJUST and OUTPUT. The output current is IOUT ≈ 1.25V / R. For example, a 25Ω resistor sets 50mA output. This works because the regulator maintains 1.25V across R, and the ADJUST pin current (≤57µA) introduces negligible error in most practical designs.
What thermal considerations apply to LM317LIPWR in TSSOP-8 package?
LM317LIPWR in TSSOP-8 (PW) has a junction-to-ambient thermal resistance (RθJA) of 149.4°C/W. To avoid thermal shutdown at 100mA output with 5V differential, PCB layout must include ≥1in² of 2oz copper connected to the exposed pad (if used) and ground plane. Derating is required above +85°C ambient; full 100mA output is only guaranteed up to +60°C ambient with standard JEDEC 2S2P board.
LM317LIPWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 38V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 32V
- Voltage Dropout (Max):
- -
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- 2.5 mA
- Current - Supply (Max):
- -
- PSRR:
- 80dB ~ 65dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
LM317LIPWR FAQ
1.How can I place an order for LM317LIPWR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM317LIPWR 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 LM317LIPWR reliable?
The price and inventory of LM317LIPWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM317LIPWR is usually 5 days.
3.What payment methods are accepted for LM317LIPWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM317LIPWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM317LIPWR?
LM317LIPWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM317LIPWR 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 LM317LIPWR?
For technical support, including LM317LIPWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM317LIPWR requirements.
6.How does Aetrix verify that LM317LIPWR is sourced from the original manufacturer or authorized distributors?
All LM317LIPWR 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 LM317LIPWR meets industry standards.
7.What is the process for return or replacement of LM317LIPWR?
All LM317LIPWR units undergo pre-shipment inspection (PSI). If there is an issue with LM317LIPWR, 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 LM317LIPWR part is unused and in its original packaging.
Return procedure for LM317LIPWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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