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Texas Instruments LM5017SDE/NOPB
- Part No.:
- LM5017SDE/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
LM5017SDE/NOPB.pdf
- Description:
- IC REG BUCK ADJ 600MA 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,355
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Product details
Overview
LM5017SDE/NOPB from Texas Instruments is a 100-V, 600-mA synchronous buck DC/DC regulator with integrated high-side and low-side N-channel MOSFETs, constant on-time (COT) control, and 7.5–100 V input range. It delivers regulated output voltage down to 1.225 V via external resistor divider, supports up to 1 MHz switching frequency, and operates without loop compensation in telecom power supplies and automotive 48-V bus systems.
For engineers reviewing the LM5017SDE/NOPB datasheet, LM5017SDE/NOPB pinout, LM5017SDE/NOPB application, or LM5017SDE/NOPB equivalent, key selection criteria include its 100-V input rating, integrated synchronous switch architecture, programmable UVLO and on-time, thermal shutdown at 165°C, and WSON-8 package with exposed thermal pad for industrial-grade reliability.
Technical Context
The LM5017SDE/NOPB implements constant on-time (COT) control using an internal 1.225 V reference comparator and one-shot on-timer whose duration is inversely proportional to VIN and set by RON. Off-time is determined by feedback voltage decay below the reference, enabling ultra-fast transient response and nearly constant frequency across line and load variations.
It integrates a 100-V startup regulator (VCC = 7.6 V, current-limited to 26 mA), bootstrap gate drive circuitry (BST–SW capacitor ≥0.01 µF), intelligent peak current limit (1.02 A threshold with VIN-dependent off-time), and dual-level UVLO (1.225 V enable threshold, 0.66 V shutdown threshold) with programmable hysteresis via external resistor divider.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5 V to 100 V - enables direct regulation from 48-V telecom or automotive battery rails without pre-regulation. |
| Output Current | 600 mA continuous - sufficient for isolated bias supplies and auxiliary rails in smart meters and industrial controllers. |
| Feedback Reference | 1.225 V ±2% - sets precise output voltage via external RFB1/RFB2 divider; determines regulation accuracy and stability margin. |
| Switching Frequency | Up to 1 MHz - adjustable via RON; supports compact magnetics and EMI filtering in space-constrained designs. |
| Thermal Shutdown | 165°C with 20°C hysteresis - protects against sustained overload or poor PCB thermal design without external sensing. |
| UVLO Threshold | 1.225 V rising, 0.66 V falling - allows programmable input start-up and shutdown behavior using external resistive divider. |
| VCC Regulator Output | 7.6 V ±1.3 V - powers internal logic and gate drivers; disables when externally supplied 8.55–13 V is applied. |
Pinout & Package
LM5017SDE/NOPB is packaged in thermally enhanced WSON-8 (4.00 mm × 4.00 mm) with exposed thermal pad (EP), requiring solder connection to RTN for optimal thermal performance (RθJA = 41.3°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RTN | Ground reference | Primary GND return path for all internal circuits and exposed pad; must be low-impedance connection to system ground plane. |
| 2 VIN | Main power input | Accepts 7.5–100 V DC; powers internal VCC regulator and high-voltage gate drivers; requires local CIN ≥1 µF ceramic. |
| 3 UVLO | Undervoltage detection input | Programmable enable/shutdown via resistor divider from VIN; 1.225 V threshold initiates operation; 0.66 V forces shutdown. |
| 4 RON | On-time programming input | Resistor between RON and VIN sets minimum on-time (≥100 ns at max VIN); determines operating frequency and light-load behavior. |
| 5 FB | Feedback input | Compares output voltage (via RFB1/RFB2) to 1.225 V reference; requires ≥25 mV ripple for stable COT operation. |
| 6 VCC | Bias supply output | 7.6 V regulated output for internal logic and gate drivers; requires 1.0 µF decoupling capacitor; UVLO at 4.5 V disables IC. |
| 7 BST | Bootstrap supply | Charged from VCC through internal diode during SW low phase; drives high-side gate; requires 0.01 µF ceramic to SW. |
| 8 SW | Power switching node | Connects to inductor and BST capacitor; carries full switching current; layout critical for EMI and efficiency. |
| EP | Exposed thermal pad | Electrically connected to RTN; must be soldered to PCB ground plane to achieve specified thermal resistance and reliability. |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | Constant on-time (COT) architecture eliminates need for external compensation network, reducing BOM count and design iteration time. |
| Integrated 100-V MOSFETs | Monolithic high-side and synchronous low-side N-channel switches eliminate external FETs and Schottky diodes, simplifying layout and improving efficiency. |
| Intelligent peak current limit | 1.02 A threshold with VIN-dependent off-time ensures safe short-circuit protection across full 7.5–100 V input range without foldback distortion. |
| Adjustable UVLO with hysteresis | Independent programming of turn-on threshold (1.225 V) and hysteresis via external resistor divider enables robust brown-in/brown-out behavior. |
| Ultra-fast transient response | COT control provides immediate on-time adjustment to load steps, minimizing output voltage deviation in dynamic applications like CPU core rails. |
Applications
| Smart Power Meter Bias Supply | Automotive 48-V Auxiliary Rail |
|---|---|
|
Use Scenario: Generating isolated 3.3 V or 5 V bias for metrology ADCs, communication interfaces (RS-485, PLC), and real-time clocks in revenue-grade electricity meters. IC Role / Device Role / Timing Role: Primary synchronous buck regulator converting 70–100 V DC link or rectified AC to stable low-voltage rail; operates continuously under wide temperature and input variation. Use Value: 100-V input rating eliminates need for front-end pre-regulator; integrated switches reduce component count; COT control maintains regulation during rapid load transients from pulse-based metering cycles. |
Use Scenario: Powering infotainment displays, ADAS sensors, or body control modules from 48-V mild-hybrid vehicle battery systems. IC Role / Device Role / Timing Role: High-efficiency step-down converter delivering 12 V or 5 V from nominal 48-V bus; handles cold-crank (down to 7.5 V) and load-dump (up to 100 V) conditions. Use Value: Wide VIN range accommodates full automotive transient profile; thermal shutdown and UVLO ensure fail-safe operation; WSON-8 package supports compact, high-density PCB layouts. |
| Telecom Line Card Power | Industrial Isolated Bias Supply |
|
Use Scenario: Providing 12 V or 15 V bias for PoE PD controllers, Ethernet PHYs, and optical transceivers on central office line cards powered from –48 V DC distribution. IC Role / Device Role / Timing Role: Non-isolated buck regulator accepting reverse-polarity input (with external polarity protection) and delivering tightly regulated output with minimal ripple. Use Value: 100-V absolute maximum rating withstands telecom surge events; no loop compensation accelerates qualification; programmable frequency avoids sensitive communication bands. |
Use Scenario: Generating gate-drive or controller bias voltages for isolated DC/DC converters (e.g., flyback, forward) in industrial motor drives and UPS systems. IC Role / Device Role / Timing Role: Compact, high-input-voltage auxiliary supply powering optocoupler drivers, PWM controllers, or isolated gate drivers in primary-side control architectures. Use Value: Eliminates need for transformer auxiliary windings or discrete HV regulators; integrated synchronous rectification improves light-load efficiency; exposed pad enables conduction cooling in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164SDE/NOPB | Wider 3–100 V input, 400 mA output, same WSON-8 package; uses different COT architecture with valley-current sensing. | Better suited for lower-input-voltage systems (e.g., 12 V or 24 V industrial buses) where LM5017SDE/NOPB's 7.5 V min may be marginal. | Select LM5164SDE/NOPB if input can dip below 7.5 V or if valley-current mode improves light-load regulation in your topology. |
| LM5008AMM/NOPB | 7.5–100 V input, 500 mA output, SO PowerPAD-8 package; older COT design with higher quiescent current (2.5 mA vs. 1.75 mA). | Larger footprint (4.89 mm × 3.90 mm), higher thermal resistance (RθJA = 41.1°C/W), and no programmable UVLO hysteresis. | Choose LM5008AMM/NOPB only if legacy SO PowerPAD-8 layout reuse is mandatory and thermal margin permits higher junction temperature rise. |
Compared with LM5017SDE/NOPB, LM5164SDE/NOPB offers broader input flexibility but lower output current, while LM5008AMM/NOPB trades package size and thermal performance for pin compatibility with earlier TI buck regulators-neither is pin-to-pin compatible, and both require board-level validation for replacement.
Availability
LM5017SDE/NOPB is available at Aetrix Electronics and suitable for smart power meters, automotive 48-V subsystems, and telecom line card power requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM5017SDE/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 LM5017SDE/NOPB belongs to TI's high-voltage DC/DC regulator product line, designed specifically for efficient, compact, and robust step-down conversion in 48-V telecom, automotive, and industrial applications where wide input range and integration are critical.
FAQ
What is the minimum recommended on-time for LM5017SDE/NOPB and why does it matter?
The minimum recommended on-time for LM5017SDE/NOPB is 100 ns at maximum input voltage (100 V). This constraint ensures reliable one-shot timer operation and prevents timing ambiguity that could cause erratic switching or loss of regulation. It directly limits the maximum achievable switching frequency at high VIN-e.g., with RON = 250 kΩ and VIN = 100 V, typical on-time is ~500 ns, supporting ≤1 MHz operation. Designers must verify on-time using TI's LM5017 design calculator or Equation 3 in the datasheet.
Can LM5017SDE/NOPB operate in discontinuous conduction mode (DCM)?
No, LM5017SDE/NOPB is not designed to operate in DCM. Its synchronous rectifier lacks diode emulation, and the constant on-time control scheme forces continuous conduction mode (CCM) across all load conditions-including light loads-by maintaining active low-side FET conduction. This behavior ensures predictable frequency and stable regulation but increases light-load quiescent current compared to DCM-capable alternatives. For true DCM operation, consider TI's LM5164 or LM5010 series.
How is the feedback ripple requirement of ≥25 mV satisfied in LM5017SDE/NOPB designs?
The LM5017SDE/NOPB requires ≥25 mV of monotonic ripple at the FB pin for stable constant on-time operation. This is typically achieved using Type 1 or Type 2 ripple configurations: Type 1 places RC in series with RFB2 to inject resistive ripple from COUT's ESR; Type 2 adds a dedicated RC network between VOUT and FB. If output capacitor ESR is too low (e.g., polymer or MLCC-only), RC must be added to meet the 25 mV threshold-TI provides design equations in Section 7.3.11 to calculate minimum RC value based on IL(MIN) and VOUT.
Does LM5017SDE/NOPB support external VCC biasing, and what are the benefits?
Yes, LM5017SDE/NOPB supports external VCC biasing between 8.55 V and 13 V. When applied, the internal high-voltage VCC regulator (7.6 V) is disabled, eliminating its power dissipation-critical at high VIN (e.g., 48 V or 72 V), where internal regulation can dissipate >300 mW. External biasing improves overall efficiency, reduces thermal stress, and enables higher output power capability. The VCC pin must still be decoupled with a 1.0 µF ceramic capacitor, and the external source must be well-regulated and low-noise.
What thermal considerations apply to the exposed pad (EP) of LM5017SDE/NOPB in WSON-8 package?
The exposed pad (EP) of LM5017SDE/NOPB must be soldered to a solid RTN copper pour on the PCB to achieve the specified RθJA = 41.3°C/W and prevent thermal runaway. TI recommends minimum 4×4 mm thermal pad with ≥4 thermal vias (0.3 mm diameter, filled or capped) connecting to inner or bottom ground planes. Inadequate EP connection raises junction temperature-e.g., omitting vias can increase RθJA by >15°C/W-potentially triggering thermal shutdown at lower ambient temperatures or degrading long-term reliability.
LM5017SDE/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-WDFN Exposed Pad
- 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):
- 100V
- 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-WSON (4x4)
LM5017SDE/NOPB FAQ
1.How can I place an order for LM5017SDE/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5017SDE/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 LM5017SDE/NOPB reliable?
The price and inventory of LM5017SDE/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5017SDE/NOPB is usually 5 days.
3.What payment methods are accepted for LM5017SDE/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5017SDE/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5017SDE/NOPB?
LM5017SDE/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5017SDE/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 LM5017SDE/NOPB?
For technical support, including LM5017SDE/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5017SDE/NOPB requirements.
6.How does Aetrix verify that LM5017SDE/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5017SDE/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 LM5017SDE/NOPB meets industry standards.
7.What is the process for return or replacement of LM5017SDE/NOPB?
All LM5017SDE/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5017SDE/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 LM5017SDE/NOPB part is unused and in its original packaging.
Return procedure for LM5017SDE/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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