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Texas Instruments LM5009ASD/NOPB
- Part No.:
- LM5009ASD/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
LM5009ASD/NOPB.pdf
- Description:
- IC REG BUCK ADJ 150MA 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:5,940
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Product details
Overview
LM5009ASD/NOPB from Texas Instruments is a 100-V, 150-mA constant ON-time nonsynchronous buck switching regulator with integrated 100-V N-channel MOSFET, operating across 6 V to 95 V input, delivering adjustable output down to 2.5 V, and featuring no loop compensation required - used in telecom bias supplies and 42-V automotive post-regulation.
For engineers reviewing the LM5009ASD/NOPB datasheet, LM5009ASD/NOPB pinout, LM5009ASD/NOPB application, or LM5009ASD/NOPB equivalent, key selection criteria include input voltage range (6–95 V), constant-frequency operation via VIN-inversely-proportional ON-time, intelligent current limit with RCL-programmable OFF-time, thermal shutdown at 165°C, and dual-package availability (VSSOP-8/WSON-8).
Technical Context
The LM5009ASD/NOPB implements a constant ON-time control architecture where switch conduction duration scales inversely with VIN, enabling stable operating frequency across line and load variations without external compensation. Its regulation relies on comparing FB voltage to a precision 2.5-V internal reference, initiating each ON pulse when FB falls below threshold.
Current limiting uses forced OFF-time controlled by RCL and FB voltage - ranging from 35 µs at FB = 0 V (short-circuit) to sub-µs at higher FB - ensuring safe short-circuit response while minimizing foldback during overload. Startup employs an integrated high-voltage VCC regulator with bypass mode below 8.5 V and regulated 7-V output above, supporting gate drive via BST/SW bootstrap capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6 V to 95 V - supports direct connection to 48-V telecom or 42-V automotive bus without pre-regulator |
| Output Current | 150 mA - sufficient for bias rails in industrial controllers and optical modules |
| Feedback Reference | 2.5 V ±20 mV - enables precise output programming using standard resistor dividers |
| ON-Time Control | Inversely proportional to VIN - maintains ~constant switching frequency across full input range |
| Current Limit Threshold | 0.3 A typical - protects internal switch during overload or short-circuit conditions |
| Thermal Shutdown | 165°C with 25°C hysteresis - prevents permanent damage under sustained overtemperature |
| Package Options | VSSOP-8 (4 mm × 4 mm) and WSON-8 (4 mm × 4 mm) - thermally enhanced for high-voltage DC/DC conversion |
Pinout & Package
LM5009ASD/NOPB is available in 8-pin VSSOP (DGK) and 8-pin WSON (NGU) packages, both measuring 4.00 mm × 4.00 mm with exposed thermal pad connected to GND. Pin functions are identical across packages.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switching node | Power switching output connected to inductor, freewheeling diode, and bootstrap capacitor - carries high dv/dt and pulsed current |
| BST (Pin 2) | Bootstrap supply | Input to internal high-side gate driver; requires 0.01-µF ceramic cap to SW for floating gate drive voltage generation |
| RCL (Pin 3) | Current limit OFF-time set | Resistor-to-RTN sets forced OFF duration during current limit - determines short-circuit safety time and overload recovery |
| RTN (Pin 4) | Ground reference | Common return for feedback, current sense, and internal regulators - must be low-impedance PCB plane |
| FB (Pin 5) | Feedback input | Inverting input of regulation comparator referenced to 2.5 V - senses output via resistor divider; bias current ≤100 nA |
| RT/SD (Pin 6) | ON-time set / shutdown | Resistor-to-VIN programs ON-time; pulled low disables regulator - provides remote enable/disable with hysteresis |
| VCC (Pin 7) | Internal bias supply | Regulated 7-V output powering gate driver and logic; requires 0.47-µF local decoupling; current-limited to 9.2 mA |
| VIN (Pin 8) | Main power input | High-voltage input (6–95 V); powers internal VCC regulator and buck switch - withstands 100-V transients |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | Constant ON-time architecture eliminates need for external compensation network - reduces BOM count and layout sensitivity |
| Intelligent current limit | OFF-time dynamically scaled by FB voltage and RCL - ensures robust short-circuit protection while minimizing foldback during partial overloads |
| Integrated 100-V N-channel switch | Eliminates external high-voltage MOSFET - simplifies design and improves reliability in high-input-voltage applications |
| Ultra-fast transient response | Fixed ON-time + fast comparator-based regulation - delivers rapid recovery from load steps without phase-margin tuning |
| Thermally enhanced packaging | VSSOP-8 and WSON-8 with exposed pad - achieves RθJA of 157.7°C/W (VSSOP) and 42.8°C/W (WSON) for high-power-density layouts |
Applications
| Telecom Bias Supply | Automotive Post-Regulator |
|---|---|
Use Scenario: Generating isolated 5-V or 3.3-V bias rails from -48-V telecom distribution bus in optical line terminals and base station controllers. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator providing stable, low-noise auxiliary power for PHYs, FPGAs, and management ICs. Use Value: Operates directly from -48-V nominal (6–95 V range accommodates reverse polarity protection and transients) with no pre-regulator needed. | Use Scenario: Regulating 12-V or 5-V subsystem rails from 42-V battery in next-generation EV powertrain control units and ADAS domain controllers. IC Role / Device Role / Timing Role: High-voltage step-down converter delivering clean, efficient power to microcontrollers and sensors in harsh automotive environments. Use Value: Withstands load dump transients up to 95 V and integrates thermal shutdown - meets AEC-Q100 stress requirements when properly heatsinked. |
| Industrial Sensor Interface | Industrial PLC Power Module |
Use Scenario: Powering analog front-ends and signal conditioners in 24-V or 48-V field instruments with wide ambient temperature range (-40°C to +125°C). IC Role / Device Role / Timing Role: Compact, high-efficiency buck regulator supplying precision analog circuitry with minimal ripple and EMI. Use Value: Adjustable 2.5-V reference and low FB bias current (<100 nA) preserve accuracy in high-impedance feedback networks. | Use Scenario: Providing auxiliary 5-V or 3.3-V rails for I/O modules and communication interfaces in programmable logic controllers operating from 24–72-V DC industrial buses. IC Role / Device Role / Timing Role: Robust primary DC/DC stage handling variable input voltage and intermittent loads in factory automation systems. Use Value: Constant-frequency operation across line/load and no compensation simplify EMI filtering and system-level compliance testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5009MX/NOPB | Same functional spec but in SOIC-8 package - larger footprint, higher RθJA (162°C/W), no exposed thermal pad | Suitable for cost-sensitive, lower-power designs where thermal performance is less critical | Select LM5009MX/NOPB only if board space allows SOIC-8 and thermal margin exceeds 20°C at full load |
| LM5164QDDARQ1 | Automotive-grade (AEC-Q100), wider 4.5–100-V input, 300-mA output, integrated soft-start - requires compensation | Designed for automotive safety-critical systems requiring qualification and enhanced diagnostics | Choose LM5164QDDARQ1 when AEC-Q100 compliance, higher output current, or diagnostic features are mandatory |
Compared with LM5009ASD/NOPB, LM5009MX/NOPB trades thermal efficiency for package compatibility, while LM5164QDDARQ1 adds automotive qualification and higher current at the cost of increased design complexity and BOM count.
Availability
LM5009ASD/NOPB is available at Aetrix Electronics and suitable for telecom infrastructure, automotive electronics, industrial sensor interfaces, and PLC power modules requiring stable component supply across extended temperature and voltage ranges.
Supply support for LM5009ASD/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 company specializing in analog, embedded processing, and power management technologies, with leadership in high-reliability industrial and automotive power solutions.
The LM5009A product line delivers high-voltage buck regulation for demanding applications including telecom, automotive, and industrial systems - designed to simplify high-input-voltage power conversion without external compensation.
FAQ
What is the minimum ON-time specification for LM5009ASD/NOPB and why does it matter?
The LM5009ASD/NOPB specifies a minimum ON-time of 400 ns at maximum input voltage (95 V). This value ensures reliable current limit detection and proper bootstrap capacitor recharge during each switching cycle. If RT is selected such that calculated ON-time falls below 400 ns, the device may fail to regulate or enter unsafe operating modes - design tools and Equation 4 in the datasheet enforce this constraint.
Can LM5009ASD/NOPB operate in continuous conduction mode (CCM) across its full load range?
LM5009ASD/NOPB operates in discontinuous conduction mode (DCM) at light loads and transitions to continuous conduction mode (CCM) at heavier loads - typically above ~50 mA depending on VIN and VOUT. The control scheme inherently supports both modes; CCM provides higher efficiency at full load, while DCM maintains regulation at very low currents without burst-mode artifacts.
How does the RCL resistor affect short-circuit protection in LM5009ASD/NOPB?
The RCL resistor sets the OFF-time duration during current limit events in LM5009ASD/NOPB. At FB = 0 V (e.g., output shorted), RCL programs a fixed 35-µs OFF period - sufficient to limit energy dissipation and prevent thermal runaway at 95 V input. As FB rises (e.g., partial overload), OFF-time decreases per Equation 5, enabling faster recovery while maintaining safety margins.
What is the role of the precharge switch on the SW pin of LM5009ASD/NOPB?
The internal precharge switch on the SW pin of LM5009ASD/NOPB activates for ~150 ns during the minimum OFF-time period to replenish bootstrap capacitor charge. This prevents gate drive undervoltage lockout during very light loads or startup when OFF-times lengthen - ensuring reliable high-side driver operation without external circuitry.
Does LM5009ASD/NOPB require a minimum load current to maintain regulation?
No, LM5009ASD/NOPB removes the minimum load requirement present in the original LM5009. Its constant ON-time architecture and intelligent current limit allow stable regulation from zero load up to 150 mA - making it suitable for standby and low-power wake-up circuits without dummy loading.
LM5009ASD/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):
- 6V
- Voltage - Input (Max):
- 95V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 85V
- Current - Output:
- 150mA
- Frequency - Switching:
- 50kHz ~ 1.1MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-WSON (4x4)
LM5009ASD/NOPB FAQ
1.How can I place an order for LM5009ASD/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5009ASD/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 LM5009ASD/NOPB reliable?
The price and inventory of LM5009ASD/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5009ASD/NOPB is usually 5 days.
3.What payment methods are accepted for LM5009ASD/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5009ASD/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5009ASD/NOPB?
LM5009ASD/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5009ASD/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 LM5009ASD/NOPB?
For technical support, including LM5009ASD/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5009ASD/NOPB requirements.
6.How does Aetrix verify that LM5009ASD/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5009ASD/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 LM5009ASD/NOPB meets industry standards.
7.What is the process for return or replacement of LM5009ASD/NOPB?
All LM5009ASD/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5009ASD/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 LM5009ASD/NOPB part is unused and in its original packaging.
Return procedure for LM5009ASD/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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