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Texas Instruments LM25017MR/NOPB
- Part No.:
- LM25017MR/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM25017MR/NOPB.pdf
- Description:
- IC REG BUCK ADJ 650MA 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:477
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Product details
Overview
LM25017MR/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 adjustable output voltage down to 1.225 V. It delivers isolated bias power in telecom systems and industrial equipment using Fly-Buck topology.
For engineers reviewing the LM25017MR/NOPB datasheet, LM25017MR/NOPB pinout, LM25017MR/NOPB application, or LM25017MR/NOPB equivalent, key selection criteria include input range (7.5–48 V), COT stability across line/load transients, programmable UVLO, thermal shutdown at 165°C, and dual-package availability (HSOP-8/WSON-8).
Technical Context
The LM25017MR/NOPB implements constant on-time control where on-time varies inversely with VIN, enabling nearly fixed switching frequency (adjustable up to 1 MHz via RON) without compensation networks. Its COT architecture relies on FB voltage ripple for off-time termination, requiring ≥25 mV ripple at FB for stable regulation.
It integrates a 7.6-V internal VCC regulator with 4.5-V UVLO, bootstrap gate drive (BST–SW capacitor: 0.01 µF), intelligent peak current limit (1.02 A typ), and dual-level UVLO (0.66 V shutdown / 1.225 V enable). The synchronous rectifier maintains continuous conduction mode (CCM) even at light loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5 V to 48 V - supports wide industrial and telecom rails without external pre-regulation. |
| Output Current | 650 mA - maximum continuous load current with integrated MOSFETs; peak current limit at 1.02 A. |
| Feedback Reference | 1.225 V ±2% - sets precise output voltage via external resistor divider (e.g., 10 V out = RFB1/RFB2 ≈ 7.17). |
| Switching Frequency | Adjustable up to 1 MHz - set by RON resistor; typical 240 kHz at VIN=48 V, RON=100 kΩ. |
| Thermal Shutdown | 165°C with 20°C hysteresis - disables switch and VCC regulator to prevent catastrophic failure. |
| UVLO Threshold | 1.225 V rising (enable), 0.66 V falling (shutdown) - externally programmable via resistor divider from VIN. |
| VCC Regulator Output | 7.6 V ±1.3 V - powers internal logic and gate drivers; disabled if external 8.55–13 V applied to VCC. |
Pinout & Package
LM25017MR/NOPB is packaged in HSOP-8 (4.89 mm × 3.90 mm) with exposed PowerPAD thermally connected to RTN. Pin functions are validated per TI SNVS951F Rev F.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RTN | Ground reference | System ground return for all internal circuits; exposed pad must be soldered to PCB ground plane. |
| 2 VIN | Main input supply | Accepts 7.5–48 V; powers internal VCC regulator and high-voltage gate drivers. |
| 3 UVLO | Undervoltage detection input | Resistor-divider node to program startup threshold and hysteresis; 0.66 V forces shutdown. |
| 4 RON | On-time programming | Resistor to VIN sets minimum on-time (e.g., 100 kΩ → ~250 ns at VIN=48 V); determines switching frequency. |
| 5 FB | Feedback input | Compares output voltage (via resistor divider) to 1.225 V reference; requires ≥25 mV ripple for COT stability. |
| 6 VCC | Bias supply output | 7.6 V regulated output for internal circuitry; decoupled with 1.0 µF ceramic; UVLO at 4.5 V. |
| 7 BST | Bootstrap supply | Charged from VCC through internal diode when SW is low; drives high-side gate via 0.01 µF BST–SW capacitor. |
| 8 SW | Switching node | Drives external inductor; connects to BST capacitor and output filter; rated for VIN + 0.3 V transient. |
Key Features
| Feature | Design Value |
|---|---|
| Constant On-Time (COT) Control | Eliminates need for external compensation components and enables ultra-fast transient response without stability tuning. |
| Integrated Synchronous Switches | 650-mA capable high-side and low-side N-MOSFETs reduce BOM count and eliminate external Schottky diode. |
| Programmable UVLO with Hysteresis | Independent threshold (1.225 V) and hysteresis (via 20 µA current source into RUV2) prevent brownout oscillation. |
| Fly-Buck™ Topology Support | Enables isolated auxiliary outputs using coupled inductor; no optocoupler or secondary controller needed. |
| Intelligent Peak Current Limit | Off-time scales with VIN and FB voltage - provides robust short-circuit protection while minimizing foldback during overload. |
Applications
| Industrial Power Supply | Smart Power Meter Bias |
|---|---|
|
Use Scenario: Generating 5-V/3.3-V bias rails from 24-V or 48-V DC distribution bus in PLCs and motor drives. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering regulated output with <100-ns current-limit response. Use Value: Eliminates external compensation and Schottky diode, reducing solution size and improving efficiency at light loads. |
Use Scenario: Providing isolated 12-V auxiliary supply for metrology ICs and communication modules in revenue-grade meters. IC Role / Device Role / Timing Role: Fly-Buck™ converter operating at 240 kHz to generate galvanically isolated output without optocoupler feedback. Use Value: Achieves <±2% output accuracy over temperature and line using internal 1.225-V reference and COT stability. |
| Telecom Line Card Supply | Isolated Sensor Interface |
|
Use Scenario: Converting -48-V telecom battery rail to +5-V for FPGA I/O banks and management controllers. IC Role / Device Role / Timing Role: Buck regulator with reverse-polarity input protection (via external diode) and remote shutdown capability. Use Value: Supports 7.5–48-V input range and thermal shutdown at 165°C for reliable operation in unventilated chassis. |
Use Scenario: Powering isolated analog front-ends (e.g., current-sense amplifiers) in high-voltage industrial sensors. IC Role / Device Role / Timing Role: Fly-Buck™ converter generating 3.3-V isolated rail referenced to sensor ground, decoupled from noisy system ground. Use Value: Delivers clean, ripple-controlled output using FB ripple configuration - critical for sub-16-bit ADC performance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QDPRRQ1 | 42-V max input, 300-mA output, integrated 100-V bootstrap diode; requires external compensation. | Automotive AEC-Q100 qualified; lower current rating; not Fly-Buck™ capable. | Choose for automotive environments needing qualification; avoid for >650-mA or isolated bias needs. |
| TPS54240DGQR | 40-V max input, 2.5-A output, current-mode control with full compensation network; no integrated low-side FET. | Higher output current; requires external MOSFET and compensation; no Fly-Buck™ support. | Choose for higher-current non-isolated designs; avoid when minimizing BOM count or supporting isolation. |
Compared with LM25017MR/NOPB, LM5164QDPRRQ1 offers automotive qualification but lacks Fly-Buck™ capability and output current headroom, while TPS54240DGQR delivers higher current but increases design complexity with external FETs and compensation - making LM25017MR/NOPB optimal for compact, isolated, medium-current industrial supplies.
Availability
LM25017MR/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 consistent parametric performance across production batches.
Supply support for LM25017MR/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, serving industrial, automotive, and communications markets since 1930.
The LM25017MR/NOPB belongs to TI's high-voltage DC/DC regulator product line, designed specifically for efficient, compact, and isolated power conversion in harsh-input industrial and telecom environments.
FAQ
What is the minimum recommended on-time for LM25017MR/NOPB and why does it matter?
The minimum recommended on-time for LM25017MR/NOPB is 100 ns at maximum input voltage (48 V). This ensures reliable one-shot timer operation and prevents premature switch turn-off that could destabilize constant on-time control. Setting RON too low risks violating this limit, causing erratic switching or failure to regulate - confirmed in Section 7.3.5 of the SNVS951F datasheet.
Can LM25017MR/NOPB operate in discontinuous conduction mode (DCM)?
No - LM25017MR/NOPB is designed to remain in continuous conduction mode (CCM) across all loads due to its synchronous rectifier architecture and absence of diode emulation. Even at light loads, the low-side MOSFET remains active, preventing inductor current reversal from reaching zero. This behavior is explicitly stated in Section 7.3.8 and ensures predictable COT loop dynamics.
How does the FB ripple requirement affect output capacitor selection for LM25017MR/NOPB?
LM25017MR/NOPB requires ≥25 mV of ripple voltage at the FB pin for stable COT operation. If the output capacitor has very low ESR (e.g., polymer or MLCC-only), insufficient ripple may result - necessitating addition of series resistance (RC) in the feedback divider path per Figure 7-1. This is not a limitation of the IC itself but a fundamental requirement of its control scheme.
Does LM25017MR/NOPB support external clock synchronization?
No - LM25017MR/NOPB does not support external clock synchronization. Its constant on-time architecture generates frequency based solely on VIN and RON, with no SYNC pin or phase-lock capability. Frequency variation remains within ±15% over line and load per Figure 6-9, making it unsuitable for noise-sensitive synchronized systems.
What is the role of the BST capacitor in LM25017MR/NOPB and what value is recommended?
The BST capacitor (0.01 µF ceramic, placed between BST and SW pins) supplies gate drive voltage for the high-side N-MOSFET. During SW low-time, it recharges from the internal VCC regulator via an integrated diode. A 0.01 µF X7R or C0G capacitor is specified in Section 7.3.7 to ensure sufficient charge storage for full gate drive swing across temperature and duty cycle.
LM25017MR/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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
LM25017MR/NOPB FAQ
1.How can I place an order for LM25017MR/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM25017MR/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 LM25017MR/NOPB reliable?
The price and inventory of LM25017MR/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM25017MR/NOPB is usually 5 days.
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LM25017MR/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM25017MR/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 LM25017MR/NOPB?
For technical support, including LM25017MR/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM25017MR/NOPB requirements.
6.How does Aetrix verify that LM25017MR/NOPB is sourced from the original manufacturer or authorized distributors?
All LM25017MR/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 LM25017MR/NOPB meets industry standards.
7.What is the process for return or replacement of LM25017MR/NOPB?
All LM25017MR/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM25017MR/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 LM25017MR/NOPB part is unused and in its original packaging.
Return procedure for LM25017MR/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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