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Texas Instruments LM5009MMX
- Part No.:
- LM5009MMX
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM5009MMX.pdf
- Description:
- IC REG BUCK ADJ 150MA 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,984
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Product details
Overview
LM5009MMX 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 datasheet, LM5009MMX pinout, LM5009MMX application, or LM5009MMX equivalent, key selection considerations include its no-loop-compensation control architecture, VIN feedforward frequency stability, intelligent current limit with VOUT-dependent off-time, thermal shutdown at 165°C, and dual-package availability (VSSOP-8 and WSON-8).
Technical Context
The LM5009MMX employs 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 compensation. Its internal 7-V startup regulator powers gate drive circuitry and shuts down when externally biased above 7 V, reducing dissipation in high-VIN applications.
Current limiting uses a forced off-time generator whose duration scales inversely with FB voltage-35 µs at short-circuit (FB = 0 V) and as low as 2.56 µs at nominal regulation (FB = 2.3 V)-ensuring robust short-circuit protection with minimal foldback. The device integrates a bootstrap gate driver requiring a 0.022-µF BST–SW capacitor and relies on an external ultra-fast 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, sensors, or driving LED strings in non-isolated topologies. |
| Feedback Reference | 2.5 V ±2% from –40°C to +125°C - enables precise output setting from 2.5 V to 85 V using resistor divider. |
| Switch RDS(on) | 2.0 Ω (typ) - limits conduction loss at 150-mA load; requires external Schottky diode for recirculation. |
| Thermal Shutdown | 165°C with 25°C hysteresis - disables switch until junction cools to ~140°C, preventing catastrophic failure. |
| Startup Regulator | 7.0 V ±0.4 V, 9.5 mA current limit - self-biases gate drive; bypassable with external 8–14 V supply to reduce dissipation. |
| Min Off-Time | 300 ns - ensures reliable bootstrap capacitor recharge and prevents shoot-through during light-load DCM. |
Pinout & Package
LM5009MMX is supplied in an 8-pin VSSOP package (3.00 mm × 3.00 mm) with exposed thermal pad (not electrically connected). Pin functions are validated per TI SNVS402I Rev. I (May 2021).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switching node output | Connects to inductor, recirculating diode cathode, and BST capacitor; carries full switching current and voltage stress up to 100 V. |
| BST (Pin 2) | Bootstrap supply | Drives high-side gate via external 0.022-µF ceramic capacitor between BST and SW; internal diode charges it from VCC during off-time. |
| RCL (Pin 3) | Current limit off-time set | Resistor to RTN sets off-time duration inversely proportional to FB voltage - 35 µs at short-circuit, shorter under overload. |
| FB (Pin 5) | Feedback input | Compares output voltage (via resistor divider) to 2.5-V internal reference; <1 nA bias current enables high-impedance sensing. |
| RTN (Pin 4) | Power ground | Common return for all internal circuits and external components; must be low-impedance connection to PCB ground plane. |
| RON/SD (Pin 6) | On-time set / shutdown | Resistor to VIN sets on-time; pulled low (<0.7 V) disables regulator - provides remote enable/disable with hysteresis. |
| VCC (Pin 7) | Internal regulator output | 7.0-V regulated supply for gate drive and control logic; can be externally biased (8–14 V) to disable internal regulator and reduce power loss. |
| VIN (Pin 8) | Main input supply | Accepts 9.5–95 V DC; withstands 100-V transients; powers internal startup regulator and high-voltage circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | Constant-on-time control eliminates need for external compensation network - reduces BOM count and design iteration time. |
| VIN feedforward frequency stability | On-time inversely proportional to VIN maintains ~constant switching frequency across 9.5–95 V input range - simplifies EMI filtering. |
| Intelligent current limit protection | Off-time scales with FB voltage - 35 µs at short-circuit, sub-3 µs under mild overload - minimizes foldback and improves recovery. |
| Ultra-fast transient response | No compensation + fixed on-time architecture enables immediate correction of load steps - critical for sensor bias and LED current regulation. |
| Thermally enhanced packaging | VSSOP-8 with exposed pad (DGK) offers 42.8°C/W RθJA - enables 150-mA operation without heatsink in compact industrial layouts. |
Applications
| Industrial Power Supply | LED Constant-Current Driver |
|---|---|
Use Scenario: Converting rectified 48-V AC mains to 12-V/5-V bias rail for PLC I/O modules and field transmitters. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering 150-mA output with input transient tolerance up to 100 V. Use Value: Eliminates heat sink required by linear regulators in 48-V systems - reduces board area and thermal management complexity. | Use Scenario: Driving medium-power LED strings from 24-V or 36-V industrial DC bus in machine vision lighting. IC Role / Device Role / Timing Role: Constant-current source configured via FB divider and sense resistor; operates in CCM for stable current regulation. Use Value: Maintains ±2% LED current accuracy over –40°C to +125°C ambient - ensures consistent luminance in harsh environments. |
| Telecom Bias Supply | Automotive 42-V Auxiliary Rail |
Use Scenario: Generating 3.3-V or 5-V auxiliary supply from 48-V telecom backplane in base station control cards. IC Role / Device Role / Timing Role: High-input-voltage buck converter with 95-V max operating input and 165°C thermal shutdown. Use Value: Supports legacy 48-V telecom infrastructure without intermediate pre-regulation - lowers system cost and component count. | Use Scenario: Providing 5-V microcontroller bias from 42-V automotive battery during cold-crank (down to 6 V) and load-dump (up to 60 V) events. IC Role / Device Role / Timing Role: Wide-input buck regulator with 95-V absolute max rating and 100-V transient capability. Use Value: Survives automotive load-dump transients without external TVS - simplifies front-end protection design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5163RTWR | Synchronous 0.5-A buck with integrated high/low-side FETs; 26-µA quiescent current vs LM5009MMX's 485–675 µA. | Supports higher output current and lower dropout; requires different layout due to synchronous rectification and no external diode. | Select LM5163RTWR for >150-mA loads or ultra-low IQ requirements; LM5009MMX remains optimal for cost-sensitive 150-mA designs with proven diode-based reliability. |
| LM5017MRX | 100-V, 600-mA non-synchronous buck; includes adjustable soft-start and precision enable threshold (1.22 V). | Better suited for higher-current industrial sensors and motor drivers; larger SO PowerPAD package (5.00 mm × 6.00 mm). | Choose LM5017MRX when >150-mA output or programmable soft-start is required; LM5009MMX offers smaller footprint and lower BOM cost for ≤150-mA applications. |
Compared with LM5163RTWR and LM5017MRX, the LM5009MMX provides the lowest system cost and smallest PCB footprint for 150-mA, wide-input buck applications - retaining design simplicity with external diode while meeting stringent thermal and transient requirements in space-constrained industrial modules.
Availability
LM5009MMX is available at Aetrix Electronics and suitable for industrial power supplies, LED current sources, telecom bias rails, and automotive auxiliary converters requiring stable component supply across extended temperature and voltage ranges.
Supply support for LM5009MMX 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, serving industrial, automotive, and communications markets.
The LM5009MMX belongs to TI's wide-input DC/DC converter product line, designed specifically for high-voltage industrial and telecom applications where reliability, thermal efficiency, and transient robustness are critical.
FAQ
What is the maximum input voltage rating for the LM5009MMX?
The LM5009MMX has an absolute maximum input voltage rating of 100 V, with recommended continuous operation from 9.5 V to 95 V. This 100-V transient rating allows safe use in 48-V telecom and 42-V automotive systems subject to load-dump events. The internal N-channel buck switch and startup regulator are fully rated for this voltage range, and the LM5009MMX datasheet specifies 100-V capability in Section 6.1 Absolute Maximum Ratings.
Does the LM5009MMX require external compensation components?
No, the LM5009MMX does not require external compensation components. Its constant-on-time control architecture - where on-time is inversely proportional to VIN - eliminates the need for loop compensation networks. This feature is explicitly stated in the "Features" section and verified in Section 7.3.1 of the LM5009MMX datasheet (SNVS402I), enabling faster transient response and simplified design. The LM5009MMX achieves regulation solely through FB feedback and RON/RCL resistor programming.
What package type is used for the LM5009MMX part number?
LM5009MMX uses the 8-pin VSSOP package (TI package code DGK), measuring 3.00 mm × 3.00 mm with an exposed thermal pad. This is confirmed in the "Device Information" table and Section 12 of the LM5009MMX datasheet (SNVS402I), which lists LM5009MMX as the VSSOP-8 orderable variant. The WSON-8 (NGU) variant is designated LM5009SDX; LM5009MMX is exclusively VSSOP.
How does the LM5009MMX implement current limit protection?
The LM5009MMX implements intelligent current limit protection using a forced off-time generator whose duration is inversely proportional to FB voltage: 35 µs at short-circuit (FB = 0 V) and as low as 2.56 µs at nominal regulation (FB = 2.3 V). This scheme ensures robust short-circuit survival while minimizing foldback during overload. The current limit threshold is 0.31 A (typ), with blanking for 50–70 ns after turn-on to avoid false triggering - details are specified in Sections 6.5 and 7.3.6 of the LM5009MMX datasheet.
Can the LM5009MMX operate without an external recirculating diode?
No, the LM5009MMX cannot operate without an external recirculating diode. As a non-synchronous buck regulator, it integrates only the high-side N-channel MOSFET switch and requires an external ultra-fast or Schottky diode (D1) connected from SW to output ground to provide inductor current path during switch-off. This requirement is clearly shown in all typical application schematics (e.g., Figure 8-1) and described in Section 7.3.7 of the LM5009MMX datasheet. Omitting D1 will cause catastrophic failure.
LM5009MMX 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:
- Obsolete
- 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 FAQ
1.How can I place an order for LM5009MMX through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5009MMX 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 reliable?
The price and inventory of LM5009MMX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5009MMX is usually 5 days.
3.What payment methods are accepted for LM5009MMX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5009MMX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5009MMX?
LM5009MMX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5009MMX 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?
For technical support, including LM5009MMX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5009MMX requirements.
6.How does Aetrix verify that LM5009MMX is sourced from the original manufacturer or authorized distributors?
All LM5009MMX 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 meets industry standards.
7.What is the process for return or replacement of LM5009MMX?
All LM5009MMX units undergo pre-shipment inspection (PSI). If there is an issue with LM5009MMX, 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 part is unused and in its original packaging.
Return procedure for LM5009MMX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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