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Texas Instruments LM25017MRE/NOPB
- Part No.:
- LM25017MRE/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM25017MRE/NOPB.pdf
- Description:
- IC REG BUCK ADJ 650MA 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:1,929
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Product details
Overview
LM25017MRE/NOPB from Texas Instruments is a 48-V, 650-mA synchronous buck/Fly-Buck™ regulator with integrated high-side and low-side N-channel MOSFETs, constant on-time (COT) control, no loop compensation required, and 1.225-V ±2% feedback reference. It operates from 7.5 V to 48 V input and delivers stable output in industrial power supplies and isolated bias applications.
For engineers reviewing the LM25017MRE/NOPB datasheet, LM25017MRE/NOPB pinout, LM25017MRE/NOPB application, or LM25017MRE/NOPB equivalent, key selection criteria include its COT architecture for ultra-fast transient response, programmable UVLO and on-time via external resistors, thermal shutdown at 165°C, and support for Fly-Buck™ isolated topologies without optocouplers.
Technical Context
The LM25017MRE/NOPB implements a constant on-time (COT) control scheme where on-time is inversely proportional to VIN and set by RON, enabling near-constant switching frequency across 7.5–48 V input. Its regulation relies on direct comparison of FB voltage to a 1.225-V internal reference, with overvoltage protection triggered at 1.62 V.
It integrates a 7.6-V VCC linear regulator (with 4.5-V UVLO), bootstrap gate drive for the high-side switch (requiring 0.01-μF BST–SW capacitor), and intelligent peak current limiting (1.02-A threshold) with VIN- and VFB-dependent off-timing for short-circuit robustness.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5 V to 48 V - supports wide industrial and telecom rails without pre-regulation. |
| Output Current | 650 mA continuous - defined by integrated MOSFET RDS(ON) (0.8 Ω high-side, 0.45 Ω sync) and thermal limits. |
| Feedback Reference | 1.225 V ±2% - sets precise output voltage via external resistor divider (e.g., 10 V out = RFB1/RFB2 = 7.16). |
| Switching Frequency | Adjustable up to 1 MHz - controlled by RON and VIN; typical 240 kHz at VIN=48 V, RON=100 kΩ. |
| Current Limit Threshold | 1.02 A peak - provides overload protection with adaptive off-time (16 μs max at VFB=0 V, VIN=48 V). |
| Thermal Shutdown | 165°C with 20°C hysteresis - disables switch and VCC regulator to prevent permanent damage. |
| UVLO Threshold | 1.225 V rising (±2.5%) - enables operation only when input-derived bias is sufficient; hysteresis set by external divider. |
Pinout & Package
LM25017MRE/NOPB is packaged in HSOP-8 (4.89 mm × 3.90 mm) with PowerPAD™ thermal pad soldered to RTN. Pin functions are electrically validated per TI SNVS951F Rev F.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RTN | Ground reference | Primary GND connection; exposed PowerPAD must be soldered to system ground plane for thermal and EMI performance. |
| 2 VIN | Main input supply | Accepts 7.5–48 V; powers internal VCC regulator and high-voltage gate drivers directly. |
| 3 UVLO | Undervoltage detection input | Resistor divider from VIN sets startup threshold; pulled below 0.66 V forces shutdown mode (IIN < 225 µA). |
| 4 RON | On-time programming | Resistor to VIN sets minimum on-time (e.g., 100 kΩ → ~250 ns at VIN=48 V); ensures stable COT operation. |
| 5 FB | Feedback input | 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 (6.25–8.55 V) powers gate drivers; requires 1.0-μF decoupling; UVLO at 4.5 V. |
| 7 BST | Bootstrap supply | Connects to SW via 0.01-μF ceramic capacitor; charged by internal VCC diode during SW low phase. |
| 8 SW | Switching node | Drives external inductor; connects to BST cap and output filter; withstands VIN +0.3 V transient. |
Key Features
| Feature | Design Value |
|---|---|
| Constant On-Time (COT) Control | Eliminates need for external compensation network; enables >10× step-down ratios and sub-µs load transient recovery. |
| Integrated Dual MOSFETs | 650-mA capability with 0.8 Ω high-side and 0.45 Ω synchronous rectifier - reduces BOM count and PCB area vs discrete solutions. |
| Fly-Buck™ Topology Support | Enables isolated bias generation without optocoupler or transformer auxiliary winding - simplifies multi-rail systems. |
| Programmable UVLO & On-Time | Independent resistor-based configuration of startup voltage and switching frequency - improves design flexibility across input ranges. |
| Intelligent Peak Current Limit | VIN- and VFB-dependent off-time prevents foldback during overload while ensuring safe short-circuit operation up to 48 V. |
Applications
| Industrial Power Supply | Smart Power Meter |
|---|---|
|
Use Scenario: Regulating 24-V or 48-V field bus to 3.3-V/5-V logic rails in PLC I/O modules and motor drives. IC Role / Device Role / Timing Role: Primary non-isolated buck converter delivering 650-mA continuous output with fast line/load transients. Use Value: COT control maintains regulation during rapid 12-V-to-48-V input surges common in factory automation environments. |
Use Scenario: Generating isolated 5-V and 3.3-V bias from 12-V battery or 24-V AC/DC in revenue-grade metering units. IC Role / Device Role / Timing Role: Fly-Buck™ controller providing galvanically isolated auxiliary rails without optocoupler feedback loop. Use Value: Integrated synchronous rectifier and COT stability enable compact, low-noise isolated supplies meeting IEC 62053 accuracy requirements. |
| Telecom Remote Radio Unit | Isolated Bias Supply |
|
Use Scenario: Point-of-load conversion in 4G/5G RRH enclosures where space, thermal density, and EMI are critical. IC Role / Device Role / Timing Role: High-efficiency buck regulator operating at 240 kHz to avoid sensitive RF bands while minimizing filter size. Use Value: 7.5–48-V input range accommodates wide-range -48-V telecom rectified inputs; thermal shutdown protects against enclosure overheating. |
Use Scenario: Providing isolated gate-drive or sensor-bias voltage in industrial inverters and HV DC-DC converters. IC Role / Device Role / Timing Role: Fly-Buck™ secondary-side regulator deriving isolated output from primary-side switching node. Use Value: Eliminates need for separate isolated DC-DC or transformer auxiliary windings - reduces bill-of-materials and layout complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164MRE/NOPB | Wider 3–65-V input, 600-mA rating, same HSOP-8 package but uses D-CAP3 control instead of COT. | Superior light-load efficiency due to diode emulation; less suitable for Fly-Buck™ without external timing adjustments. | Choose LM5164MRE/NOPB when input exceeds 48 V or discontinuous conduction mode (DCM) is preferred. |
| TPS54340DDAR | 42-V max input, 3.5-A output, current-mode control, SOIC-8 package - larger footprint and higher quiescent current (146 µA vs 50 µA). | Requires full compensation network; better suited for high-current, fixed-frequency designs with tight EMI constraints. | Choose TPS54340DDAR when >650-mA output current or strict frequency jitter control is mandatory. |
Compared with LM25017MRE/NOPB, LM5164MRE/NOPB extends input range but lacks native Fly-Buck™ timing compatibility, while TPS54340DDAR offers higher current but demands compensation design effort and consumes more board area - making LM25017MRE/NOPB optimal for compact, isolated, medium-current industrial supplies.
Availability
LM25017MRE/NOPB is available at Aetrix Electronics and suitable for industrial equipment, smart power meters, and telecommunication systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM25017MRE/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 ICs, with decades of expertise in high-reliability power conversion solutions.
The LM25017 product line targets cost-sensitive, space-constrained industrial and telecom applications requiring integrated high-voltage buck/Fly-Buck™ regulation without external compensation or optocouplers.
FAQ
What is the maximum input voltage supported by the LM25017MRE/NOPB?
The LM25017MRE/NOPB supports an absolute maximum input voltage of 53 V, with recommended operating range from 7.5 V to 48 V. Operation above 48 V risks exceeding thermal limits and reducing reliability, especially under high ambient temperatures or heavy load conditions. The device's internal VCC regulator and gate drivers are designed for sustained 48-V operation.
Does the LM25017MRE/NOPB require external compensation components?
No, the LM25017MRE/NOPB uses constant on-time (COT) control and does not require external compensation components. Its stability is inherent to the control architecture, relying on output capacitor ESR-induced ripple at the FB pin (minimum 25 mV required). This eliminates loop compensation design effort and improves transient response versus traditional voltage-mode controllers.
Can the LM25017MRE/NOPB be used in Fly-Buck™ topology?
Yes, the LM25017MRE/NOPB is explicitly designed for Fly-Buck™ isolated bias supply applications. Its COT control, integrated synchronous rectifier, and robust SW node rating allow reliable operation with coupled inductors. TI provides reference designs (e.g., PMP10227) validating 5-V/100-mA isolated outputs from 24-V input using LM25017MRE/NOPB.
What is the purpose of the RON pin on the LM25017MRE/NOPB?
The RON pin on the LM25017MRE/NOPB sets the minimum on-time duration via an external resistor to VIN. This resistor determines switching frequency - for example, a 100-kΩ resistor yields ~250 ns on-time at 48 V input. RON must be selected to ensure ≥100 ns minimum on-time at maximum VIN to maintain stable COT regulation and avoid subharmonic oscillation.
How does the LM25017MRE/NOPB handle overcurrent conditions?
The LM25017MRE/NOPB employs intelligent peak current limiting: when inductor current exceeds 1.02 A, the on-time is immediately terminated and a VIN- and VFB-dependent off-time is initiated. At VFB = 0 V and VIN = 48 V, this off-time reaches 16 μs for short-circuit protection; it shortens under partial overload to minimize foldback and improve recovery time.
LM25017MRE/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):
- 48V
- Voltage - Output (Min/Fixed):
- 1.225V
- Voltage - Output (Max):
- 40V
- Current - Output:
- 650mA
- Frequency - Switching:
- Up to 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
LM25017MRE/NOPB FAQ
1.How can I place an order for LM25017MRE/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM25017MRE/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 LM25017MRE/NOPB reliable?
The price and inventory of LM25017MRE/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM25017MRE/NOPB is usually 5 days.
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LM25017MRE/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM25017MRE/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 LM25017MRE/NOPB?
For technical support, including LM25017MRE/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM25017MRE/NOPB requirements.
6.How does Aetrix verify that LM25017MRE/NOPB is sourced from the original manufacturer or authorized distributors?
All LM25017MRE/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 LM25017MRE/NOPB meets industry standards.
7.What is the process for return or replacement of LM25017MRE/NOPB?
All LM25017MRE/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM25017MRE/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 LM25017MRE/NOPB part is unused and in its original packaging.
Return procedure for LM25017MRE/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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