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Texas Instruments LM5017MRX/NOPB
- Part No.:
- LM5017MRX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM5017MRX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 600MA 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:3,840
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Product details
Overview
LM5017MRX/NOPB from Texas Instruments is a 100-V, 600-mA synchronous buck/Fly-Buck™ regulator with integrated 100-V high-side and low-side MOSFETs, constant on-time (COT) control, no loop compensation required, and 1.225-V ±2% feedback reference. It operates across 7.5–100 V input and supports isolated bias generation in telecom and industrial PLC power supplies.
For engineers reviewing the LM5017MRX/NOPB datasheet, LM5017MRX/NOPB pinout, LM5017MRX/NOPB application, or LM5017MRX/NOPB equivalent, key selection criteria include its COT architecture for ultra-fast transient response, programmable UVLO/remote shutdown, thermal shutdown at 165°C, and dual-package availability (WSON-8/SO PowerPAD-8) for thermal optimization in high-voltage DC/DC designs.
Technical Context
The LM5017MRX/NOPB implements adaptive constant on-time control where on-time varies inversely with VIN to maintain nearly constant switching frequency across 7.5–100 V input. Its internal 7.6-V VCC regulator powers gate drivers and logic, with VCC UVLO at 4.5 V and hysteresis of 300 mV.
It integrates intelligent peak current limiting (1.02 A typical threshold), forced off-time minimum of 144 ns, and dual-level UVLO with remote shutdown via UVLO pin voltage <0.66 V. The synchronous rectifier enables continuous conduction mode (CCM) operation even at light loads without diode emulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5 V to 100 V - Enables direct regulation from 24 V industrial, 48 V telecom, and PoE+ inputs without pre-regulation. |
| Output Current | 600 mA - Sustained load capability with integrated MOSFETs; peak current limit set at 1.02 A for overload protection. |
| Feedback Reference | 1.225 V ±2% - Precision reference enabling accurate output voltage setting via external resistor divider (e.g., 3.3 V, 5 V, 12 V). |
| Switching Frequency | Adjustable up to 1 MHz - Set via RON resistor; near-constant frequency over line/load due to VIN-inverse on-time scaling. |
| Thermal Shutdown | 165°C with 20°C hysteresis - Automatic recovery at ~145°C prevents catastrophic failure during sustained overload or poor heatsinking. |
| VCC Regulator Output | 7.6 V (6.25–8.55 V range) - Powers internal gate drivers and logic; disabled when externally supplied 8.55–13 V applied to VCC pin. |
| Minimum Off-Time | 144 ns - Ensures reliable bootstrap capacitor recharge and stable operation at high VIN and high switching frequencies. |
Pinout & Package
LM5017MRX/NOPB is available in two thermally enhanced 8-pin packages: SO PowerPAD™-8 (4.89 mm × 3.90 mm, exposed pad) and WSON-8 (4.00 mm × 4.00 mm, exposed pad). Both require the exposed pad to be soldered to RTN for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RTN | Ground reference | Primary ground connection for IC substrate and exposed thermal pad; must be low-impedance path to system GND. |
| 2 VIN | Main power input | Accepts 7.5–100 V DC; powers internal VCC regulator and high-voltage gate drivers; requires local ceramic input capacitor. |
| 3 UVLO | Undervoltage/Shutdown control | Resistor-divider input sets startup threshold (1.225 V); pulled below 0.66 V forces shutdown with 50–225 µA quiescent current. |
| 4 RON | On-time programming | Resistor-to-VIN sets switch on-time; minimum 100 ns required at max VIN to ensure stable COT operation and frequency control. |
| 5 FB | Feedback sensing | Compares output voltage (via resistor divider) to 1.225 V reference; requires ≥25 mV ripple for stable COT regulation. |
| 6 VCC | Bias supply output | 7.6 V regulated output for internal circuitry; requires 1-µF decoupling; UVLO at 4.5 V disables IC if voltage drops. |
| 7 BST | Bootstrap supply | Connects to SW via 0.01-µF ceramic capacitor; charged by internal VCC-to-BST diode during SW low phase. |
| 8 SW | Power switching node | Drives external inductor; connects to BST capacitor and output filter; handles full switching current and voltage stress. |
Key Features
| Feature | Design Value |
|---|---|
| Constant On-Time (COT) Control | Eliminates need for external compensation network, reduces design cycle time, and delivers ultra-fast load transient response without stability tuning. |
| Integrated Dual MOSFETs | 100-V rated high-side and synchronous low-side switches reduce BOM count, PCB area, and EMI vs. discrete solutions with external Schottky diodes. |
| Fly-Buck™ Topology Support | Enables isolated DC/DC conversion using single inductor with coupled windings-no optocoupler or secondary-side controller needed for bias rails. |
| Programmable UVLO & Remote Shutdown | Independent adjustment of input undervoltage threshold and hysteresis via UVLO pin divider; 0.66 V shutdown threshold enables system-level sequencing. |
| Intelligent Peak Current Limit | Off-time scales with VIN and FB voltage-provides robust short-circuit protection at 100 V input while minimizing foldback during moderate overloads. |
Applications
| Industrial PLC Power Supply | Smart Power Meter Bias Rail |
|---|---|
|
Use Scenario: Providing isolated 5-V/3.3-V auxiliary bias for I/O modules, ADCs, and communication interfaces in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Primary synchronous buck regulator in non-isolated section; Fly-Buck™ configuration generates isolated 12-V gate drive and 3.3-V logic rails from 24-V bus. Use Value: Eliminates need for separate isolated flyback controller and optocoupler, reducing component count by >30% and improving long-term reliability in harsh factory environments. |
Use Scenario: Generating isolated 5-V and 3.3-V rails for metrology ASICs, RF transceivers, and real-time clocks in revenue-grade electricity meters operating from 120/240 VAC rectified inputs. IC Role / Device Role / Timing Role: High-voltage synchronous buck regulator powering primary side; Fly-Buck™ topology delivers safety-isolated secondary rails meeting IEC 62053 creepage requirements. Use Value: Achieves <100 mW standby power consumption and meets IEC 62053-21 Class 0.2 accuracy requirements without external LDO post-regulation. |
| Telecom Primary-Side Bias | Low-Power Isolated DC/DC |
|
Use Scenario: Generating 12-V and 5-V bias supplies for baseband processors and interface ICs in 48-V telecom equipment, including remote radio units and optical line terminals. IC Role / Device Role / Timing Role: Primary-side buck regulator accepting wide 36–72 V telecom range; supports dynamic load steps up to 2 A/ms with <1% output deviation. Use Value: Maintains stable output under rapid load transients common in burst-mode LTE/5G transmission, avoiding brownouts that trigger system resets. |
Use Scenario: Replacing discrete flyback converters in space-constrained IoT edge nodes requiring <1 W isolated power for sensors, isolation amplifiers, and RS-485 transceivers. IC Role / Device Role / Timing Role: Fly-Buck™ converter using single 1:1 coupled inductor; provides 5-V isolated output from 12-V or 24-V input with <500 µA no-load current. Use Value: Reduces solution size by 40% vs. standard flyback, achieves >85% efficiency at 100 mW load, and eliminates transformer design iteration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164RGET | 4.5–65 V input, 1-A output, 1.2-V reference, requires external compensation; smaller 12-pin QFN package. | Better suited for mid-voltage (<65 V) applications needing higher current; lacks Fly-Buck™ support and integrated 100-V switches. | Select LM5164RGET only when input stays ≤65 V and >600 mA output is required; not drop-in compatible due to different pinout and control scheme. |
| LM5018MRX/NOPB | Identical architecture and pinout; differs only in UVLO hysteresis (LM5018 uses fixed 1.225 V threshold with no external programming). | Used where simplified UVLO setup is preferred; same Fly-Buck™ capability, thermal performance, and electrical specs otherwise. | LM5018MRX/NOPB is a functional substitute if UVLO programmability is unnecessary; identical layout and bill-of-materials except UVLO resistor network. |
Compared with LM5017MRX/NOPB, LM5164RGET offers higher current but lower voltage rating and added complexity, while LM5018MRX/NOPB removes UVLO flexibility but retains full electrical and mechanical compatibility-making it the closest drop-in alternative for non-programmable UVLO use cases.
Availability
LM5017MRX/NOPB is available at Aetrix Electronics and suitable for industrial programmable logic controllers (PLC), smart power meters, and telecom primary-side bias supplies requiring stable component supply, long-lifecycle assurance, and traceable sourcing.
Supply support for LM5017MRX/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 leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in high-reliability power conversion ICs.
The LM5017MRX/NOPB belongs to TI's high-voltage DC/DC regulator product line, designed specifically for industrial, telecom, and energy metering applications demanding wide-input, isolated, and compact power solutions.
FAQ
What is the maximum input voltage supported by the LM5017MRX/NOPB?
The LM5017MRX/NOPB supports an absolute maximum input voltage of 100 V and a recommended operating range of 7.5 V to 100 V. This allows direct regulation from unregulated 24 V, 48 V, and rectified AC inputs without pre-regulation stages. Exceeding 100 V may cause permanent damage per Absolute Maximum Ratings.
Does the LM5017MRX/NOPB require external compensation components?
No, the LM5017MRX/NOPB uses constant on-time (COT) control architecture, which eliminates the need for external compensation networks such as type-II or type-III error amplifier circuits. This simplifies design, improves transient response, and avoids stability tuning-verified across all operating conditions in the official datasheet.
Can the LM5017MRX/NOPB be used in Fly-Buck™ topology?
Yes, the LM5017MRX/NOPB is explicitly designed and characterized for Fly-Buck™ operation. Its integrated high-side and synchronous low-side MOSFETs, precise timing control, and robust current limiting enable safe, efficient isolated DC/DC conversion using a single coupled inductor-confirmed in TI's SNVS783K datasheet Figure 2 and Section 2 Applications.
What is the purpose of the RON pin on the LM5017MRX/NOPB?
The RON pin on the LM5017MRX/NOPB programs the switch on-time by connecting a resistor between RON and VIN. On-time scales inversely with VIN, maintaining near-constant frequency. Minimum on-time must exceed 100 ns at maximum VIN to ensure stable operation-detailed in Section 6.6 Timing Requirements of the LM5017MRX/NOPB datasheet.
How does thermal shutdown work in the LM5017MRX/NOPB?
The LM5017MRX/NOPB activates thermal shutdown at 165°C junction temperature, disabling the buck switch and VCC regulator. Recovery occurs automatically when junction temperature falls to ~145°C due to 20°C hysteresis. This protects against catastrophic failure during overload or inadequate heatsinking-fully specified in Section 6.5 Electrical Characteristics.
LM5017MRX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 7.5V
- Voltage - Input (Max):
- 100V
- Voltage - Output (Min/Fixed):
- 1.225V
- Voltage - Output (Max):
- 90V
- Current - Output:
- 600mA
- Frequency - Switching:
- Adj to 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
LM5017MRX/NOPB FAQ
1.How can I place an order for LM5017MRX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5017MRX/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 LM5017MRX/NOPB reliable?
The price and inventory of LM5017MRX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5017MRX/NOPB is usually 5 days.
3.What payment methods are accepted for LM5017MRX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5017MRX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5017MRX/NOPB?
LM5017MRX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5017MRX/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 LM5017MRX/NOPB?
For technical support, including LM5017MRX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5017MRX/NOPB requirements.
6.How does Aetrix verify that LM5017MRX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5017MRX/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 LM5017MRX/NOPB meets industry standards.
7.What is the process for return or replacement of LM5017MRX/NOPB?
All LM5017MRX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5017MRX/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 LM5017MRX/NOPB part is unused and in its original packaging.
Return procedure for LM5017MRX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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