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Texas Instruments LM5009MMX/NOPB
- Part No.:
- LM5009MMX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM5009MMX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 150MA 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:8,947
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Product details
Overview
LM5009MMX/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, 2.5-V ±2% feedback reference over –40°C to +125°C, and operation from 9.5 V to 95 V input. It delivers stable DC/DC conversion in high-voltage industrial power supplies and LED current sources.
For engineers reviewing the LM5009MMX/NOPB datasheet, LM5009MMX/NOPB pinout, LM5009MMX/NOPB application, or LM5009MMX/NOPB equivalent, key selection considerations include its no-loop-compensation control architecture, VIN feedforward for frequency stability, intelligent current limit with RCL-programmable off-time, thermal shutdown at 165°C, and dual-package availability (VSSOP-8 and WSON-8).
Technical Context
The LM5009MMX/NOPB uses a constant-on-time control scheme where on-time is inversely proportional to VIN, enabling stable switching frequency across input and load variations without external loop compensation. Its internal 7-V startup regulator powers gate drive circuitry and shuts down when externally biased above 7 V, reducing quiescent dissipation.
Current limiting employs a forced off-time generator whose duration is inversely proportional to FB voltage-35 µs at short-circuit (FB = 0 V), scaling down under partial overload-ensuring robust short-circuit protection while minimizing foldback. The device integrates a bootstrap gate driver requiring a 0.022-µF BST–SW capacitor and mandates an external ultrafast or Schottky recirculating diode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 9.5 V to 95 V - supports rectified 12-V/24-V/36-V/48-V AC mains and telecom bus rails without pre-regulation. |
| Output Current | 150 mA - sufficient for biasing downstream ICs or driving medium-power LED strings. |
| Feedback Reference | 2.5 V ±2% from –40°C to +125°C - enables precise output regulation with minimal temperature drift. |
| Switching Frequency | Up to 600 kHz - allows compact magnetics and low-profile output capacitors in space-constrained designs. |
| Buck Switch RDS(on) | 2.0 Ω (typ) - limits conduction loss at 150 mA, supporting >85% efficiency in typical 48-V-to-12-V conversions. |
| Thermal Shutdown | 165°C with 25°C hysteresis - protects against sustained overload or poor PCB thermal design. |
| Current Limit Threshold | 0.31 A (typ) - provides hard short-circuit protection while allowing peak startup currents up to 370 mA. |
Pinout & Package
LM5009MMX/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). Both packages feature identical pinout and include an exposed thermal pad (WSON only) recommended for connection to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switching node output | Drives external inductor and recirculating diode; connects to BST capacitor; carries full switching current. |
| BST | Bootstrap supply | Provides floating gate drive voltage via 0.022-µF ceramic capacitor between BST and SW; internal diode charges it from VCC. |
| RCL | Current limit off-time set | Resistor to RTN programs off-time duration during current limit - 35 µs at FB = 0 V, scaling down as FB rises. |
| FB | Feedback input | Compares output voltage divider ratio against 2.5-V internal reference; <1 nA bias current minimizes divider error. |
| RTN | Power ground reference | Common return for internal regulation, current sense, and external components; must be low-impedance path to system ground. |
| RON/SD | On-time set / shutdown control | Resistor to VIN sets minimum on-time; pulled to GND for remote shutdown - threshold 0.4–1.05 V rising edge. |
| VCC | Internal startup regulator output | 7.0-V regulated output powers gate driver; shuts down if externally biased >7 V to reduce dissipation at high VIN. |
| VIN | Main input supply | Accepts 9.5–95 V DC; withstands 100-V transients; powers internal startup regulator and high-side switch. |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | Constant-on-time control eliminates external compensation network - reduces BOM count and layout sensitivity. |
| VIN feedforward frequency stabilization | On-time inversely proportional to VIN maintains ~constant switching frequency across 9.5–95 V input range. |
| Intelligent current limit with programmable off-time | RCL resistor sets off-time 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 - simplifies design and improves reliability in 48-V/95-V systems. |
| Ultra-fast transient response | No compensation + fast comparator-based control achieves sub-microsecond load step recovery without ringing. |
Applications
| Heat Sink Eliminator | Rectified AC Mains Supply |
|---|---|
Use Scenario: Replacing linear regulators (e.g., 78xx series) in 24-V or 48-V industrial control modules where heat sink volume and thermal management are constrained. IC Role / Device Role / Timing Role: Non-synchronous buck controller providing fixed 5-V or 12-V bias rail directly from unregulated high-voltage DC input. Use Value: Eliminates heat sink requirement by achieving >85% efficiency vs. <40% for linear regulators at 48-V input, reducing board area and thermal derating overhead. | Use Scenario: Powering auxiliary circuits in non-isolated AC-DC supplies derived from rectified 120/230-VAC mains using bridge rectifiers and bulk capacitors. IC Role / Device Role / Timing Role: Wide-input step-down regulator accepting 9.5–95 V DC from bulk storage, delivering stable 15-V or 24-V for control logic and sensing. Use Value: Operates across full rectified AC envelope (e.g., 340-V peak → ~200-V DC after decay) without input pre-regulator, simplifying front-end design. |
| LED Constant-Current Driver | Automotive 42-V Bus Converter |
Use Scenario: Driving medium-power LED arrays (e.g., signage, status indicators) requiring precise current regulation from variable high-voltage sources. IC Role / Device Role / Timing Role: Buck controller configured in constant-current mode using sense resistor in return path and FB feedback from current-sense amplifier. Use Value: Leverages 2.5-V reference accuracy and low FB bias current (<1 nA) to achieve <3% LED current variation over temperature and line. | Use Scenario: Generating 5-V or 3.3-V logic rails from next-generation 42-V automotive battery systems during cold-crank or load-dump conditions. IC Role / Device Role / Timing Role: High-input-voltage buck regulator surviving 95-V transients and operating down to 9.5-V minimum input during cranking. Use Value: Withstands ISO 7637-2 Pulse 5a (75-V/350-ms) without shutdown, enabling robust ECU power architecture without external TVS stacking. |
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 |
|---|---|---|---|
| LM5008MMX/NOPB | Lower 80-V max input, 100-mA output, same control architecture and pinout. | Suitable for ≤80-V systems (e.g., 36-V industrial buses); not rated for 95-V continuous or 100-V transients. | Select when input never exceeds 80 V and lower output current suffices - cost-optimized alternative with identical layout. |
| LM5163HQRNXTQ1 | 100-V synchronous buck, 0.5-A output, integrated high/low-side FETs, 26-µA quiescent current. | Higher efficiency at light loads, smaller solution size, automotive AEC-Q100 qualified; requires different compensation and layout. | Choose for new automotive or battery-powered designs needing higher current, lower IQ, or synchronous efficiency - not drop-in compatible. |
Compared with LM5008MMX/NOPB, LM5009MMX/NOPB extends input range to 95 V and output current to 150 mA for harsher industrial environments; compared with LM5163HQRNXTQ1, it trades synchronous efficiency and AEC-Q100 qualification for simpler diode-based topology and broader legacy compatibility.
Availability
LM5009MMX/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, LED lighting drivers, and automotive auxiliary converters requiring stable component supply across extended temperature and voltage ranges.
Supply support for LM5009MMX/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 designing analog ICs, embedded processors, and power management solutions for industrial, automotive, and communications markets.
The LM5009MMX/NOPB belongs to TI's high-voltage DC/DC converter product line, engineered for reliable, low-BOM-count buck regulation in systems powered directly from rectified AC, telecom buses, or automotive 42-V architectures.
FAQ
What is the maximum input voltage rating for LM5009MMX/NOPB?
The LM5009MMX/NOPB has an absolute maximum input voltage of 100 V and a recommended operating range of 9.5 V to 95 V. It is designed to withstand transient overvoltages up to 100 V on the VIN pin without damage, making it suitable for applications with high-voltage surges such as rectified AC mains or automotive load-dump events. Operation beyond 95 V continuous is not recommended per datasheet specifications.
Does LM5009MMX/NOPB require external loop compensation components?
No, LM5009MMX/NOPB does not require external loop compensation components. Its constant-on-time control architecture uses VIN feedforward and an internal comparator-based regulation scheme that eliminates the need for external RC networks. This simplifies design, reduces component count, and ensures ultra-fast transient response without stability tuning - a key differentiator versus traditional voltage-mode or current-mode controllers.
How is the switching frequency set on LM5009MMX/NOPB?
The switching frequency of LM5009MMX/NOPB is determined by the RON resistor connected between the RON/SD pin and VIN. On-time is inversely proportional to VIN and set by RON, yielding a relatively constant frequency 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 at maximum VIN, limiting maximum achievable frequency per application.
Can LM5009MMX/NOPB be used in synchronous buck configurations?
No, LM5009MMX/NOPB is a non-synchronous buck controller and cannot be used in synchronous configurations. It integrates only a single N-channel high-side buck switch and requires an external recirculating diode (Schottky or ultrafast) for low-side conduction. Synchronous operation requires complementary high-side and low-side FETs with precise timing control - a capability provided by TI's LM5163, not LM5009MMX/NOPB.
What thermal management guidance applies to LM5009MMX/NOPB in WSON package?
For the LM5009MMX/NOPB in WSON-8 package, TI specifies a junction-to-board thermal resistance (RθJB) of 20.1°C/W. To maintain safe operation below 125°C junction temperature, the PCB must incorporate the exposed thermal pad connected to a solid copper ground plane with multiple thermal vias. Layout guidelines recommend ≥4 thermal vias (0.3-mm diameter) under the pad, each connected to an internal ground plane, to achieve effective heat dissipation in high-ambient or high-load scenarios.
LM5009MMX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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):
- 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-VSSOP
LM5009MMX/NOPB FAQ
1.How can I place an order for LM5009MMX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5009MMX/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 LM5009MMX/NOPB reliable?
The price and inventory of LM5009MMX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5009MMX/NOPB is usually 5 days.
3.What payment methods are accepted for LM5009MMX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5009MMX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5009MMX/NOPB?
LM5009MMX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5009MMX/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 LM5009MMX/NOPB?
For technical support, including LM5009MMX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5009MMX/NOPB requirements.
6.How does Aetrix verify that LM5009MMX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5009MMX/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 LM5009MMX/NOPB meets industry standards.
7.What is the process for return or replacement of LM5009MMX/NOPB?
All LM5009MMX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5009MMX/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 LM5009MMX/NOPB part is unused and in its original packaging.
Return procedure for LM5009MMX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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