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Texas Instruments LM5009AMMX/NOPB
- Part No.:
- LM5009AMMX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM5009AMMX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 150MA 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:10,912
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Product details
Overview
LM5009AMMX/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 from 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 LM5009AMMX/NOPB datasheet, LM5009AMMX/NOPB pinout, LM5009AMMX/NOPB application, or LM5009AMMX/NOPB equivalent, key selection considerations include input voltage range (6–95 V), current limit threshold (0.3 A typ), thermal shutdown (165 °C), ON-time programmability via RT resistor, and dual-package availability (VSSOP-8 / WSON-8).
Technical Context
The LM5009AMMX/NOPB implements a constant ON-time control scheme where ON time varies inversely with VIN, enabling stable operating frequency across line and load variations without external compensation. Its regulation relies on a 2.5-V internal reference compared against FB voltage, with overvoltage protection at 2.875 V.
Current limiting uses an intelligent OFF-time generator whose duration is set by RCL and inversely proportional to VFB - providing 35 µs forced OFF time during short-circuit (FB = 0 V) and shorter durations under partial overload. Startup employs an integrated high-voltage series pass regulator delivering 7-V VCC with 9.2-mA current limit and bypass mode below 8.5 V.
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 buses without pre-regulation |
| Output Current | 150 mA max - sufficient for bias rails in industrial controllers and remote I/O modules |
| Switching Element | Integrated 100-V N-channel MOSFET - eliminates external high-voltage switch and reduces BOM count |
| Feedback Reference | 2.5 V ±20 mV - enables precise output setting using standard resistor dividers (e.g., 1 kΩ + 3.01 kΩ for 10 V) |
| Current Limit Threshold | 0.3 A typ - protects against short circuits while allowing peak inrush during startup |
| Thermal Shutdown | 165 °C with 25 °C hysteresis - prevents permanent damage during sustained overload or poor heatsinking |
| Operating Frequency | 50 kHz to 1.1 MHz - adjustable via RT resistor; remains stable across input and load changes due to COT architecture |
| VCC Regulator Output | 7 V ±0.4 V, 9.2 mA max - powers internal gate driver and logic; bypassed below 8.5 V to minimize dissipation |
Pinout & Package
LM5009AMMX/NOPB is supplied in an 8-pin VSSOP package (4.00 mm × 4.00 mm) with exposed thermal pad connected to GND for enhanced heat dissipation. Pin functions are validated per TI SNVS608H datasheet Rev H.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switching node | Connects to inductor, freewheeling diode, and bootstrap capacitor; carries full switching current and high dv/dt |
| BST (Pin 2) | Bootstrap supply | Accepts 0.01-µF ceramic capacitor between BST and SW to sustain high-side gate drive during ON time |
| RCL (Pin 3) | Current limit OFF-time set | Resistor to RTN sets forced OFF duration during overcurrent - 35 µs at FB = 0 V, scaling inversely with VFB |
| RTN (Pin 4) | Ground reference | System ground return for feedback, current sense, and internal regulators; must be low-impedance path |
| FB (Pin 5) | Feedback input | High-impedance (100 nA bias) input tied to resistor divider; regulates output when voltage equals 2.5 V reference |
| RT/SD (Pin 6) | ON-time set / shutdown | Resistor to VIN programs ON time; pulled low disables regulator - threshold is 0.7 V typical with 35-mV hysteresis |
| VCC (Pin 7) | Internal bias supply | 7-V regulated output requiring 0.47-µF local decoupling; powers gate driver and control circuitry |
| VIN (Pin 8) | Main power input | Accepts 6–95 V DC; withstands 100-V transients; feeds internal start-up regulator and high-voltage switch |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | Constant ON-time control eliminates need for external compensation network - simplifies design and improves transient response |
| Ultra-fast transient response | Regulation recovers within one switching cycle after load step - enabled by ripple-based feedback sensing and fixed ON-time architecture |
| Intelligent current limit | OFF time scales with FB voltage - delivers full 35 µs protection during short circuit but reduces recovery delay under mild overload |
| Internal start-up regulator | Self-biases from VIN (6–95 V); provides 7-V VCC with bypass mode below 8.5 V - avoids external bias supply |
| Thermal shutdown with hysteresis | Shuts down at 165 °C and resumes at ~140 °C - prevents thermal runaway while allowing safe restart after cooling |
| Precharge switch for bootstrap | Active for 150 ns during minimum OFF time - ensures reliable gate drive even under light-load or precharged-output conditions |
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 remote radio units and base station control cards. IC Role / Device Role / Timing Role: Primary nonsynchronous buck regulator converting unregulated 48-V input to stable low-voltage bias for microcontrollers, ADCs, and interface ICs. Use Value: Eliminates need for external high-voltage MOSFET and compensation components - reduces solution size and design cycle time. | Use Scenario: Providing clean 5-V supply for infotainment processors and ADAS sensors from 42-V battery rail in next-generation electric vehicle architectures. IC Role / Device Role / Timing Role: Secondary high-voltage post-regulator stepping down 42-V nominal bus to regulated 5-V output with fast load transient immunity. Use Value: Withstands 95-V load dump transients and maintains regulation during cold-crank dips - meets automotive reliability requirements. |
| Industrial Sensor Interface | LED Driver Bias Rail |
Use Scenario: Powering analog front-end circuits (op-amps, current sources, signal conditioners) in 24-V or 48-V field-mounted pressure/temperature transmitters. IC Role / Device Role / Timing Role: Compact, high-input-voltage buck converter delivering low-noise 3.3-V or 5-V supply with minimal external components. Use Value: Operates reliably across wide temperature range (–40°C to 125°C) and rejects EMI from nearby motor drives or solenoids. | Use Scenario: Generating stable 12-V bias for LED driver ICs in commercial lighting systems powered from 24-V or 48-V DC distribution. IC Role / Device Role / Timing Role: Efficient step-down regulator supplying auxiliary power to constant-current LED controller ICs. Use Value: Delivers >85% efficiency at 100–150 mA load - minimizes thermal stress in enclosed luminaires and extends lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5017MHE/NOPB | Wider input range (8–100 V), higher output current (650 mA), synchronous rectification, requires loop compensation | Supports heavier loads and higher efficiency but increases design complexity and BOM cost | Select when >150 mA output or synchronous efficiency is required; not drop-in due to different pinout and compensation needs |
| TPS54160DGQ | Narrower input (3.5–60 V), lower max input, integrated compensation, 1.5-A output, current-mode control | Suitable for 24-V industrial systems but cannot replace LM5009AMMX/NOPB in 48-V telecom or 42-V automotive due to 60-V VIN limit | Choose for cost-sensitive 24-V applications needing higher current; verify VIN derating for transients before substitution |
Compared with LM5009AMMX/NOPB, LM5017MHE/NOPB offers higher current and synchronous operation at the expense of added design overhead, while TPS54160DGQ provides greater integration for lower-voltage systems but lacks the 95-V input capability essential for telecom and automotive use cases.
Availability
LM5009AMMX/NOPB is available at Aetrix Electronics and suitable for telecom infrastructure, automotive electronics, and industrial sensor interface applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM5009AMMX/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 digital signal technologies, with leadership in power management ICs for industrial, automotive, and communications markets.
The LM5009A product line delivers high-input-voltage buck regulators optimized for simplicity and reliability in harsh environments - designed specifically for telecom bias, automotive post-regulation, and industrial power conversion where wide VIN and robust protection are critical.
FAQ
What is the absolute maximum input voltage rating for LM5009AMMX/NOPB?
The absolute maximum input voltage (VIN to GND) for LM5009AMMX/NOPB is 100 V, as specified in the Absolute Maximum Ratings table of the SNVS608H datasheet. Operation beyond this level risks permanent device damage. The recommended operating range remains 6 V to 95 V, with transient tolerance up to 100 V - making LM5009AMMX/NOPB suitable for automotive load-dump and telecom surge conditions.
Does LM5009AMMX/NOPB require external compensation components?
No, LM5009AMMX/NOPB does not require external compensation components. Its constant ON-time (COT) control architecture inherently stabilizes the feedback loop without capacitors or resistors in the compensation network. This simplifies PCB layout and improves transient response - a confirmed feature documented in the "No Loop Compensation Required" bullet of the official datasheet and verified in the Functional Block Diagram and Detailed Description sections.
What is the function of the RCL pin on LM5009AMMX/NOPB?
The RCL pin on LM5009AMMX/NOPB sets the forced OFF time during current-limit events. A resistor connected between RCL and RTN determines OFF duration, which scales inversely with FB voltage - delivering 35 µs at FB = 0 V (short circuit) and shorter times under partial overload. This intelligent current limiting is explicitly defined in the Pin Functions table and Electrical Characteristics section of the LM5009A datasheet (SNVS608H), ensuring safe operation across fault conditions.
Can LM5009AMMX/NOPB operate in discontinuous conduction mode (DCM)?
Yes, LM5009AMMX/NOPB operates in discontinuous conduction mode (DCM) at light loads, as confirmed in Section 7.3.1 of the SNVS608H datasheet. In DCM, inductor current falls to zero each cycle, reducing switching losses and maintaining high efficiency at low output currents. The device automatically transitions between DCM and continuous conduction mode (CCM) based on load - a behavior validated by the efficiency vs. load current curves and equations provided in the Typical Characteristics section.
What package options are available for LM5009AMMX/NOPB?
LM5009AMMX/NOPB is offered exclusively in the 8-pin VSSOP package (DGK), measuring 4.00 mm × 4.00 mm with exposed thermal pad. While the LM5009A family also includes a WSON-8 variant (NGU), the LM5009AMMX/NOPB orderable part number maps specifically to the VSSOP package per TI's official orderable addendum and packaging documentation - confirmed by the "LM5009AMMX/NOPB" suffix and distributor parametric listings.
LM5009AMMX/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):
- 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-VSSOP
LM5009AMMX/NOPB FAQ
1.How can I place an order for LM5009AMMX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5009AMMX/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 LM5009AMMX/NOPB reliable?
The price and inventory of LM5009AMMX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5009AMMX/NOPB is usually 5 days.
3.What payment methods are accepted for LM5009AMMX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5009AMMX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5009AMMX/NOPB?
LM5009AMMX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5009AMMX/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 LM5009AMMX/NOPB?
For technical support, including LM5009AMMX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5009AMMX/NOPB requirements.
6.How does Aetrix verify that LM5009AMMX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5009AMMX/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 LM5009AMMX/NOPB meets industry standards.
7.What is the process for return or replacement of LM5009AMMX/NOPB?
All LM5009AMMX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5009AMMX/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 LM5009AMMX/NOPB part is unused and in its original packaging.
Return procedure for LM5009AMMX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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