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Texas Instruments LM5009SDX/NOPB
- Part No.:
- LM5009SDX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
LM5009SDX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 150MA 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,327
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Product details
Overview
LM5009SDX/NOPB from Texas Instruments is a wide-input, non-synchronous buck switching regulator with integrated 100-V N-channel MOSFET, 150-mA output current capability, 9.5–95-V input range, and 2.5-V ±2% feedback reference over –40°C to +125°C. It delivers stable DC/DC conversion in high-voltage industrial power supplies and LED biasing circuits.
For engineers reviewing the LM5009SDX/NOPB datasheet, LM5009SDX/NOPB pinout, LM5009SDX/NOPB application, or LM5009SDX/NOPB equivalent, key selection criteria include its no-compensation control architecture, VIN feedforward frequency stability, intelligent current limit with VOUT-dependent off-time, thermal shutdown at 165°C, and dual-package availability in VSSOP-8 and WSON-8.
Technical Context
The LM5009SDX/NOPB implements a constant-on-time control scheme where switch on-time is inversely proportional to VIN, enabling stable operating frequency without external loop compensation. Its regulation relies on a 2.5-V internal reference compared against FB voltage, with overvoltage protection triggered at 2.875 V.
Current limiting uses a forced off-time generator whose duration is set by RCL and modulated by FB voltage-35 µs at short-circuit (FB = 0 V), scaling down under partial overload. Startup is enabled by an internal 7-V, 9.5-mA high-voltage regulator fed directly from VIN, with auxiliary VCC bias support up to 14 V to reduce dissipation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 9.5 V to 95 V - supports rectified 12/24/36/48-V AC mains and telecom bus rails without pre-regulation |
| Output Current | 150 mA - sufficient for biasing controllers, sensors, and low-power logic in high-side supply chains |
| Feedback Reference | 2.5 V ±2% - enables precise output setting from 2.5 V to 85 V using resistor divider; stable across full temperature range |
| Switching Frequency | Up to 600+ kHz - determined by RON and VIN; enables compact magnetics and fast transient response |
| Buck Switch RDS(on) | 2.0 Ω (typ) - integrated 100-V N-MOSFET reduces BOM count and simplifies layout vs. external FET solutions |
| Thermal Shutdown | 165°C with 25°C hysteresis - protects against sustained overload or poor heatsinking in enclosed industrial enclosures |
| Current Limit Threshold | 0.31 A (typ) - provides short-circuit protection with intelligent foldback via VOUT-scaled off-time |
Pinout & Package
LM5009SDX/NOPB is available in two thermally enhanced packages: 8-pin VSSOP (3.0 mm × 3.0 mm) and 8-pin WSON (4.0 mm × 4.0 mm) with exposed thermal pad. Both packages share identical pinout and function mapping.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switching node output | Connects to inductor, recirculating diode, and bootstrap capacitor; carries pulsed high-current buck switch waveform |
| BST | Bootstrap supply | Provides gate drive voltage for internal N-MOSFET via external 0.022-µF ceramic capacitor between BST and SW |
| RCL | Current limit off-time set | Resistor-to-ground sets forced off-time duration during current limit; scales inversely with FB voltage |
| FB | Feedback input | Monitors regulated output via resistor divider; 2.5-V threshold triggers on-time; 2.875-V OV comparator disables switch |
| RTN | Power ground reference | Common return for all internal circuitry and external components; must be low-impedance PCB connection |
| RON/SD | On-time set / shutdown control | Resistor-to-VIN sets on-time; pulled low to disable regulator - enables remote power sequencing and fault shutdown |
| VCC | Internal regulator output | 7.0-V regulated supply for gate driver and control logic; can be externally biased (8–14 V) to bypass internal HV regulator |
| VIN | Main input supply | Accepts 9.5–95-V DC input; withstands 100-V transients; powers internal startup regulator and switch drain |
Key Features
| Feature | Design Value |
|---|---|
| No external loop compensation required | Constant-on-time control eliminates need for compensation network - reduces design time and component count |
| VIN feedforward frequency stability | On-time inversely proportional to VIN maintains ~constant switching frequency across line and load variations |
| Intelligent current limit with VOUT-dependent off-time | Off-time scales from 35 µs (short-circuit) down to sub-µs (light overload), minimizing foldback and improving recovery |
| Integrated 100-V N-channel buck switch | Eliminates external high-voltage MOSFET and associated gate drive complexity in wide-input applications |
| Ultra-fast transient response | No compensation + fixed on-time architecture enables rapid correction of load or line steps without ringing or overshoot |
Applications
| Industrial Power Supply | LED Constant-Current Driver |
|---|---|
Use Scenario: Converting rectified 48-V AC mains to 12-V bias rail for PLC I/O modules in factory automation cabinets. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator providing stable, high-efficiency 12-V/150-mA output with minimal external components. Use Value: Eliminates heat sink required by linear regulators at 48-V input, reducing system size and thermal management overhead. | Use Scenario: Driving strings of high-brightness LEDs from 36-V automotive or 42-V truck battery systems. IC Role / Device Role / Timing Role: Constant-voltage source feeding external current-sense resistor and MOSFET to establish precise LED current. Use Value: Enables direct operation from unregulated vehicle battery rails while maintaining tight output regulation across cold-crank and load-dump conditions. |
| Telecom Bias Supply | Heat-Sink-Free Linear Replacement |
Use Scenario: Generating 5-V/100-mA auxiliary supply from 48-V telecom backplane for monitoring ICs and interface logic. IC Role / Device Role / Timing Role: High-input-voltage buck converter delivering low-noise, well-regulated bias with <2% FB tolerance over temperature. Use Value: Replaces inefficient 78L05-based solutions, cutting power loss by >70% and eliminating thermal derating concerns. | Use Scenario: Upgrading legacy 24-V linear regulator designs in DIN-rail mounted industrial controllers to improve efficiency and reliability. IC Role / Device Role / Timing Role: Drop-in replacement topology for LM78xx-style circuits, retaining same input/output connections but adding switching efficiency. Use Value: Achieves >85% efficiency at full load versus <40% for linear equivalents, removing mandatory heat sinks and enabling sealed enclosure use. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar non-synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5008MM/NOPB | Lower 80-V max input, 100-mA output, same control architecture and pinout | Suitable only for ≤80-V inputs; not rated for 95-V continuous or 100-V transients | Select when input never exceeds 80 V and lower output current suffices - smaller solution size possible |
| LM5163RNTT | Synchronous 0.5-A buck, 100-V input, integrated high/low-side FETs, 26-µA quiescent current | Higher efficiency at light loads, reduced EMI, no external diode required - but requires different layout and compensation | Choose for new designs needing higher current, better light-load efficiency, or simplified BOM - not drop-in compatible |
Compared with LM5008MM/NOPB, LM5009SDX/NOPB supports higher input voltage and output current, making it suitable for 95-V industrial rails; compared with LM5163RNTT, it trades synchronous efficiency and lower IQ for simpler implementation, lower cost, and proven robustness in legacy high-voltage bias applications.
Availability
LM5009SDX/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, LED driver bias stages, and telecom auxiliary rails requiring stable component supply with long-term manufacturability and consistent parametric performance.
Supply support for LM5009SDX/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 broad industrial and automotive design expertise.
The LM5009 belongs to TI's wide-input DC/DC regulator product line, engineered specifically for high-voltage, low-to-moderate current bias applications where simplicity, reliability, and thermal efficiency outweigh the need for synchronous rectification.
FAQ
What is the maximum input voltage rating for LM5009SDX/NOPB?
The LM5009SDX/NOPB has an absolute maximum input voltage rating of 100 V, with recommended continuous operation from 9.5 V to 95 V. This allows safe use in 48-V telecom systems, rectified 36-V/48-V AC mains, and automotive 42-V architectures including load-dump transients. Exceeding 95 V continuously may reduce lifetime reliability despite surviving short transients.
Does LM5009SDX/NOPB require external loop compensation components?
No, LM5009SDX/NOPB does not require external loop compensation components. Its constant-on-time control architecture - where on-time is inversely proportional to VIN - inherently stabilizes the regulation loop without feedback capacitors or resistors. This simplifies design, reduces BOM count, and delivers ultra-fast transient response without risk of instability from component tolerances.
How is the switching frequency set on LM5009SDX/NOPB?
The switching frequency of LM5009SDX/NOPB is set by an external resistor (RON) connected between the RON/SD pin and VIN. On-time is calculated as TON = 1.25×10−10 × RON / VIN, resulting in frequency stability across input and load variations. For example, with RON = 200 kΩ and VIN = 48 V, typical frequency is ~330 kHz. Minimum on-time is 250 ns, limiting maximum frequency at 95-V input to ~420 kHz.
Can LM5009SDX/NOPB drive a 150-mA load across its full input voltage range?
Yes, LM5009SDX/NOPB is specified to deliver 150-mA output current across its full 9.5–95-V input range, provided thermal design meets junction temperature limits (≤125°C). At high input voltages, efficiency remains >80% with proper layout and thermal pad soldering - especially critical in WSON package where RθJB = 20.1°C/W enables effective PCB heat spreading.
What is the purpose of the RCL pin on LM5009SDX/NOPB?
On LM5009SDX/NOPB, the RCL pin sets the current limit off-time duration using an external resistor to RTN. During overcurrent events, the internal buck switch is disabled for a time inversely proportional to FB voltage - preset to 35 µs at short-circuit (FB = 0 V) and scaling downward under partial overload. This intelligent foldback improves short-circuit survivability and reduces recovery delay compared to fixed off-time limiters.
LM5009SDX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-WDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 9.5V
- Voltage - Input (Max):
- 95V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 85V
- Current - Output:
- 150mA
- Frequency - Switching:
- -
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-WSON (4x4)
LM5009SDX/NOPB FAQ
1.How can I place an order for LM5009SDX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5009SDX/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 LM5009SDX/NOPB reliable?
The price and inventory of LM5009SDX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5009SDX/NOPB is usually 5 days.
3.What payment methods are accepted for LM5009SDX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5009SDX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5009SDX/NOPB?
LM5009SDX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5009SDX/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 LM5009SDX/NOPB?
For technical support, including LM5009SDX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5009SDX/NOPB requirements.
6.How does Aetrix verify that LM5009SDX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5009SDX/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 LM5009SDX/NOPB meets industry standards.
7.What is the process for return or replacement of LM5009SDX/NOPB?
All LM5009SDX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5009SDX/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 LM5009SDX/NOPB part is unused and in its original packaging.
Return procedure for LM5009SDX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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