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Texas Instruments LM5009SDC/NOPB
- Part No.:
- LM5009SDC/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
LM5009SDC/NOPB.pdf
- Description:
- IC REG BUCK ADJ 150MA 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:14,124
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Product details
Overview
LM5009SDC/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 LM5009SDC/NOPB datasheet, LM5009SDC/NOPB pinout, LM5009SDC/NOPB application, or LM5009SDC/NOPB equivalent, key selection criteria 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 LM5009SDC/NOPB implements a constant-on-time control scheme where switch on-time is inversely proportional to 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 triggered at 2.875 V.
Current limiting uses a forced off-time generator whose duration scales inversely with VOUT via RCL and FB voltage-35 µs at short-circuit (FB = 0 V), reducing under partial overload. The integrated 100-V N-channel buck switch is driven by a bootstrap circuit (BST–SW) requiring a 0.022-µF ceramic capacitor, while an internal 7-V startup regulator powers gate drive and control logic from VIN directly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 9.5 V to 95 V - supports rectified AC mains, 48-V telecom, and 42-V automotive bus inputs without pre-regulation. |
| Output Current | 150 mA - maximum continuous load current with internal MOSFET; limited by thermal design and current foldback behavior. |
| Feedback Reference | 2.5 V ±2% - precise regulation threshold over full temperature range; sets output via resistor divider (VOUT = 2.5 × (R1+R2)/R2). |
| Switching Frequency | Up to 600 kHz - determined by RON and VIN; no loop compensation required due to on-time/VIN inverse relationship. |
| Current Limit Threshold | 0.31 A typical - protects switch during overload; off-time dynamically adjusted from 35 µs (short-circuit) down to sub-µs levels as VOUT rises. |
| Thermal Shutdown | 165°C activation with 25°C hysteresis - disables switch until junction cools to ~140°C; prevents catastrophic failure under sustained overload. |
| VCC Startup Regulator | 7.0 V ±0.4 V - self-biases gate drive and control circuitry; shuts down if externally supplied >8 V to reduce dissipation. |
Pinout & Package
LM5009SDC/NOPB is available in thermally enhanced 8-pin WSON (4.00 mm × 4.00 mm) and standard 8-pin VSSOP (3.00 mm × 3.00 mm) packages. Both feature exposed thermal pad (WSON only) for PCB ground connection to improve heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switch node | Power switching output connected to inductor, recirculating diode, and BST capacitor; carries pulsed high-current drain-source path. |
| BST | Bootstrap supply | Provides floating gate-drive voltage for N-channel MOSFET; requires 0.022-µF ceramic cap to SW; charged via internal diode from VCC during off-time. |
| RCL | Current limit off-time set | Resistor-to-ground sets forced off-time duration during current limit; off-time decreases as FB voltage rises above 0 V. |
| FB | Feedback input | Inverting input of regulation comparator; compares output-derived voltage to 2.5-V reference; <5 nA bias current enables high-impedance dividers. |
| RTN | Power ground | Common return for all internal circuitry and external components; must be low-impedance connection to system ground plane. |
| RON/SD | On-time set / shutdown | Resistor-to-VIN sets on-time; pulled low disables regulator; rising-edge threshold 0.7 V typical for remote shutdown control. |
| VCC | Internal regulator output | 7.0-V regulated supply for gate driver and control logic; current-limited to 9.5 mA; disable by applying 8–14 V externally. |
| VIN | Main input | High-voltage input (9.5–95 V); powers internal startup regulator and provides reference for on-time calculation; withstands 100-V transients. |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | Constant-on-time control eliminates need for external compensation network - reduces BOM count and layout sensitivity. |
| Ultra-fast transient response | On-time retriggering at every FB dip below 2.5 V enables immediate correction - critical for dynamic load steps in industrial sensors. |
| VIN feedforward frequency stability | On-time ∝ 1/VIN ensures operating frequency remains stable across 10:1 input range - simplifies EMI filtering design. |
| Intelligent current limit protection | Off-time scales with VOUT via RCL and FB - provides full 35-µs protection at short-circuit while minimizing foldback during mild overload. |
| Integrated 100-V N-channel MOSFET | Eliminates external high-voltage switch - reduces solution size and enables single-chip 95-V input conversion with minimal external parts. |
Applications
| Industrial Power Supply | LED Constant-Current Driver |
|---|---|
Use Scenario: Converting rectified 24–48 V AC mains to isolated or non-isolated 5–12 V DC for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator providing stable bias rail; operates at fixed frequency up to 600 kHz to minimize filter size. Use Value: Eliminates heat sink needed with linear regulators at same input/output differential - reduces board area and thermal management cost. | Use Scenario: Driving strings of high-brightness LEDs from 36–95 V DC sources in signage and architectural lighting. IC Role / Device Role / Timing Role: Constant-voltage source feeding external current-sense resistor or dedicated LED driver IC; leverages accurate 2.5-V reference for tight current regulation. Use Value: Supports wide input range without input pre-regulation - enables direct use of rectified AC or battery stacks while maintaining ±2% output accuracy. |
| Automotive Subsystem Bias | Heat Sink Eliminator Replacement |
Use Scenario: Generating 3.3 V or 5 V from 42-V automotive battery for infotainment or ADAS camera modules. IC Role / Device Role / Timing Role: High-input-voltage buck converter handling cold-crank (9.5 V) and load-dump (95 V) conditions per ISO 16750-2. Use Value: Withstands 100-V transients and operates down to –40°C - meets automotive qualification requirements without external TVS or LDO pre-regulators. | Use Scenario: Replacing obsolete 78Lxx linear regulators in legacy equipment where space and thermal constraints prevent heat sink retrofitting. IC Role / Device Role / Timing Role: Drop-in efficiency upgrade delivering same output voltage with >85% efficiency vs. <30% for linear regulators at 24 V input. Use Value: Reduces power dissipation by >70% - enables operation in sealed enclosures or high-ambient-temperature environments without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar wide-input buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5163RTWR | Synchronous rectification; 500-mA output; lower quiescent current (13 µA); requires external bootstrap diode. | Better efficiency at light loads; smaller solution size; not pin-compatible - different pinout and control scheme (current-mode vs. constant-on-time). | Select when higher output current, tighter light-load efficiency, or reduced BOM count outweighs need for identical footprint or control simplicity. |
| LM5017MRX/NOPB | 100-V input; 600-mA output; current-mode control; requires external compensation; larger SOIC-10 package. | Higher current capability and design flexibility via adjustable compensation; less sensitive to output capacitor ESR; needs more external components. | Select when output current exceeds 150 mA or when output ripple and transient response require tunable loop dynamics. |
Compared with LM5009SDC/NOPB, LM5163RTWR offers higher current and synchronous efficiency but demands redesign; LM5017MRX/NOPB provides greater current and compensation flexibility at the cost of added complexity and larger footprint - LM5009SDC/NOPB remains optimal for compact, low-component-count 150-mA wide-input applications.
Availability
LM5009SDC/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, LED drivers, automotive subsystems, and heat-sink-elimination retrofits requiring stable component supply and long-term manufacturability.
Supply support for LM5009SDC/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, serving industrial, automotive, and communications markets.
The LM5009 belongs to TI's wide-input DC/DC regulator product line, designed specifically for high-voltage non-isolated buck conversion in space-constrained, thermally demanding applications where simplicity and reliability are critical.
FAQ
What is the maximum input voltage rating for LM5009SDC/NOPB?
The LM5009SDC/NOPB has an absolute maximum input voltage rating of 100 V, with recommended operating range from 9.5 V to 95 V. This allows safe operation under transient conditions such as load dump in automotive systems or surge events in industrial AC rectified supplies. Exceeding 100 V may cause permanent damage, and operation above 95 V should be limited to short-duration transients only.
Does LM5009SDC/NOPB require external loop compensation components?
No, LM5009SDC/NOPB does not require external loop compensation components. Its constant-on-time control architecture - where on-time is inversely proportional to VIN - inherently provides stable regulation without feedback compensation networks. This eliminates the need for external capacitors and resistors typically used in voltage-mode or current-mode controllers, simplifying design and improving transient response.
How does the current limit protection work in LM5009SDC/NOPB?
The LM5009SDC/NOPB implements intelligent current limit protection using a forced off-time generator. When switch current exceeds 0.31 A, the on-cycle terminates immediately and an off-time begins. That off-time is set by RCL and FB voltage: 35 µs at FB = 0 V (short-circuit), decreasing as VOUT rises. This ensures robust short-circuit protection while minimizing foldback during partial overloads - a key advantage over fixed-timer or latch-off schemes.
Can LM5009SDC/NOPB be used with an external VCC supply?
Yes, LM5009SDC/NOPB supports external VCC biasing. Applying 8–14 V to the VCC pin disables the internal 7-V startup regulator, reducing power dissipation in high-VIN applications. This is especially useful when an auxiliary supply is already available, such as in multi-rail systems. External VCC must be well-decoupled with ≥0.1 µF ceramic capacitance and must never exceed 14 V to avoid damage.
What package options are available for LM5009SDC/NOPB?
LM5009SDC/NOPB is offered in two RoHS-compliant packages: 8-pin VSSOP (DGK, 3.00 mm × 3.00 mm) and thermally enhanced 8-pin WSON (NGU, 4.00 mm × 4.00 mm) with exposed thermal pad. Both are surface-mount, lead-free, and compatible with standard reflow profiles. The WSON variant provides significantly lower junction-to-board thermal resistance (20.1°C/W vs. 77.9°C/W for VSSOP), making it preferred for higher ambient temperature or higher duty-cycle applications.
LM5009SDC/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-WDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- 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)
LM5009SDC/NOPB FAQ
1.How can I place an order for LM5009SDC/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5009SDC/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 LM5009SDC/NOPB reliable?
The price and inventory of LM5009SDC/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5009SDC/NOPB is usually 5 days.
3.What payment methods are accepted for LM5009SDC/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5009SDC/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5009SDC/NOPB?
LM5009SDC/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5009SDC/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 LM5009SDC/NOPB?
For technical support, including LM5009SDC/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5009SDC/NOPB requirements.
6.How does Aetrix verify that LM5009SDC/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5009SDC/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 LM5009SDC/NOPB meets industry standards.
7.What is the process for return or replacement of LM5009SDC/NOPB?
All LM5009SDC/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5009SDC/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 LM5009SDC/NOPB part is unused and in its original packaging.
Return procedure for LM5009SDC/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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