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Texas Instruments LM5009SDCX/NOPB
- Part No.:
- LM5009SDCX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
LM5009SDCX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 150MA 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:4,768
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Product details
Overview
LM5009SDCX/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 LM5009SDCX/NOPB datasheet, LM5009SDCX/NOPB pinout, LM5009SDCX/NOPB application, or LM5009SDCX/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 (VSSOP-8/WSON-8).
Technical Context
The LM5009SDCX/NOPB implements 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 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 for partial overloads. The integrated startup regulator delivers 7.0-V ±0.4-V VCC output with 9.5-mA current limit and 6.3-V UVLO threshold.
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 gate drivers, sensors, or low-power microcontrollers in high-voltage systems. |
| Feedback Reference | 2.5 V ±2% from –40°C to +125°C - enables precise output setting via resistor divider with minimal drift over temperature. |
| Switching Frequency | Up to 600 kHz - allows compact magnetics and output filtering while maintaining efficiency above 85% at mid-load. |
| Current Limit Threshold | 0.31 A typical - protects internal MOSFET during overload or short-circuit with VOUT-dependent off-time recovery. |
| Thermal Shutdown | 165°C with 25°C hysteresis - disables switch until junction cools to ~140°C, preventing catastrophic failure under sustained overload. |
| VCC Regulator Output | 7.0 V ±0.4 V - powers internal gate driver and logic; shuts down when externally biased ≥8 V to reduce dissipation. |
Pinout & Package
LM5009SDCX/NOPB is available in thermally enhanced 8-pin WSON (4.00 mm × 4.00 mm) with exposed pad for PCB ground connection. Pin functions are validated per TI SNVS402I Rev I (May 2021).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switching node output | Connects to inductor, recirculating diode, and bootstrap capacitor; carries pulsed high-side switching current. |
| BST | Bootstrap supply | Provides floating gate drive voltage for internal N-MOSFET via 0.022-µF ceramic capacitor to SW. |
| RCL | Current limit off-time set | Resistor to RTN sets off-time duration during current limit; 35 µs max at FB = 0 V (short-circuit). |
| FB | Feedback input | Compares output voltage (via resistor divider) to 2.5-V internal reference; <1 nA bias current minimizes divider error. |
| RTN | Power ground | Common return path for VCC, FB, RCL, RON/SD; must be low-impedance connection to PCB ground plane. |
| RON/SD | On-time set / shutdown | Resistor to VIN sets on-time; pulled low disables regulator - enables remote power sequencing or fault shutdown. |
| VCC | Internal regulator output | 7.0-V regulated supply for gate drive and logic; requires 0.1-µF local decoupling; max 14 V if externally biased. |
| VIN | Main input supply | Accepts 9.5–95-V DC; withstands 100-V transients; powers startup regulator and high-voltage circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| No external compensation required | Constant-on-time control eliminates need for type-II/type-III compensation network - reduces BOM count and layout sensitivity. |
| VIN feedforward frequency stability | On-time inversely proportional to VIN maintains ~constant switching frequency across 10:1 input range - simplifies EMI filter design. |
| Intelligent current limit protection | Off-time scales with FB voltage - 35 µs at short-circuit, shorter for mild overloads - minimizes foldback and improves recovery time. |
| Integrated high-voltage startup regulator | Self-biases VCC from VIN up to 95 V - eliminates external bias supply; shuts down when VCC ≥8 V to cut quiescent loss. |
| Ultra-fast transient response | No loop compensation + direct FB sensing enables sub-microsecond recovery from load steps - critical for sensor or ADC bias rails. |
Applications
| Industrial AC Mains Bias Supply | LED Constant-Current Driver |
|---|---|
Use Scenario: Generating isolated or non-isolated 5–12 V bias for PLC I/O modules powered from rectified 24-V or 48-V AC mains. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator converting 34–68 V DC (from bridge-rectified 24/48 VAC) to stable 5 V/12 V for logic and analog circuitry. Use Value: Eliminates heat sink needed with linear regulators; operates reliably across wide input range without derating at high line. | Use Scenario: Driving strings of high-brightness LEDs from 36–72 V DC bus in signage or architectural lighting. IC Role / Device Role / Timing Role: Constant-voltage source feeding external current-sense resistor and MOSFET to regulate LED current. Use Value: Enables >90% efficiency at 150 mA output vs. 40–60% for linear solutions - reduces thermal management burden and system size. |
| Telecom 48-V Bus Converter | Automotive 42-V Auxiliary Power |
Use Scenario: Providing 3.3 V or 5 V auxiliary power for monitoring ICs and interface circuitry in 48-V telecom equipment. IC Role / Device Role / Timing Role: Secondary buck stage stepping down nominal 48 V (range 36–72 V) to low-voltage logic rails. Use Value: Withstands 100-V transients common in telecom environments; 2.5-V reference accuracy ensures stable MCU core voltage. | Use Scenario: Powering infotainment or ADAS subsystems from 42-V battery systems in next-gen hybrid vehicles. IC Role / Device Role / Timing Role: High-input buck regulator converting 36–60 V battery range to 5 V/3.3 V for microcontrollers and sensors. Use Value: Operates across full automotive temperature range (–40°C to +125°C) with guaranteed 2% FB accuracy - ensures functional safety compliance. |
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 |
|---|---|---|---|
| LM5008SDX/NOPB | Lower 80-V input rating, 100-mA output, same control architecture and pinout. | Suitable only for ≤80-V systems; reduced current margin limits use in higher-load LED or telecom bias designs. | Select when input voltage never exceeds 80 V and load stays below 100 mA - lower cost, smaller solution size. |
| LM5163HWRNXT | Synchronous 0.5-A buck with integrated high/low-side FETs, 100-V rating, 26-µA IQ, and spread-spectrum EMI reduction. | Higher efficiency at light loads, lower quiescent current, but requires different layout and lacks RCL-based current limit tuning. | Choose for new designs needing >92% efficiency, ultra-low standby power, or stricter EMI requirements - not drop-in compatible. |
Compared with LM5008SDX/NOPB, LM5009SDCX/NOPB adds 15-V input headroom and 50-mA current margin for robustness in fluctuating high-voltage rails; versus LM5163HWRNXT, it trades synchronous efficiency for simpler design, lower cost, and programmable current-limit behavior - ideal for cost-sensitive, thermally constrained applications.
Availability
LM5009SDCX/NOPB is available at Aetrix Electronics and suitable for industrial AC mains bias supplies, LED constant-current drivers, telecom 48-V bus converters, and automotive 42-V auxiliary power systems requiring stable component supply across extended temperature and high-voltage operating conditions.
Supply support for LM5009SDCX/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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.
The LM5009 belongs to TI's high-voltage DC/DC converter product line, designed specifically for efficient, compact, and robust power conversion in systems with input voltages exceeding 40 V - targeting rectified AC, telecom, and automotive auxiliary rails.
FAQ
What is the maximum input voltage rating for LM5009SDCX/NOPB?
The LM5009SDCX/NOPB has an absolute maximum input voltage rating of 100 V, with recommended continuous operation from 9.5 V to 95 V. This 100-V rating accommodates transient surges common in rectified AC and automotive systems. Operation beyond 95 V should be limited to short-duration transients, and proper input clamping or filtering is advised to ensure long-term reliability of the internal 100-V N-channel buck switch.
Does LM5009SDCX/NOPB require external compensation components?
No, LM5009SDCX/NOPB does not require external compensation components. Its constant-on-time control architecture, with on-time inversely proportional to VIN, eliminates the need for traditional feedback loop compensation networks. This simplifies design, reduces component count, and delivers ultra-fast transient response - typically recovering within microseconds after load steps - without stability tuning or phase-margin analysis.
How is the switching frequency set on LM5009SDCX/NOPB?
The switching frequency of LM5009SDCX/NOPB is set by the resistor connected between RON/SD and VIN. On-time is calculated as TON = 1.25 × 10−10 × RON / VIN, resulting in a frequency that remains relatively constant across input and load variations due to VIN feedforward. For example, with RON = 237 kΩ and VIN = 48 V, nominal frequency is ~337 kHz. Minimum on-time is 250 ns, limiting maximum frequency to ~444 kHz at VIN = 95 V.
What package options are available for LM5009SDCX/NOPB?
LM5009SDCX/NOPB is offered in two thermally optimized packages: 8-pin VSSOP (DGK, 3.00 mm × 3.00 mm) and 8-pin WSON (NGU, 4.00 mm × 4.00 mm) with exposed thermal pad. 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 where thermal performance is critical.
Can LM5009SDCX/NOPB be used in LED constant-current applications?
Yes, LM5009SDCX/NOPB is commonly used in LED constant-current applications by configuring it as a constant-voltage source that drives an external current-sense resistor and pass transistor. Its 9.5–95-V input range supports direct connection to rectified AC lines or high-voltage DC buses, and its 2.5-V ±2% feedback reference ensures accurate current setting over temperature. Combined with ultra-fast transient response, it maintains stable LED brightness during dynamic load changes without external compensation.
LM5009SDCX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-WDFN Exposed Pad
- 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-WSON (4x4)
LM5009SDCX/NOPB FAQ
1.How can I place an order for LM5009SDCX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5009SDCX/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 LM5009SDCX/NOPB reliable?
The price and inventory of LM5009SDCX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5009SDCX/NOPB is usually 5 days.
3.What payment methods are accepted for LM5009SDCX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5009SDCX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5009SDCX/NOPB?
LM5009SDCX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5009SDCX/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 LM5009SDCX/NOPB?
For technical support, including LM5009SDCX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5009SDCX/NOPB requirements.
6.How does Aetrix verify that LM5009SDCX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5009SDCX/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 LM5009SDCX/NOPB meets industry standards.
7.What is the process for return or replacement of LM5009SDCX/NOPB?
All LM5009SDCX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5009SDCX/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 LM5009SDCX/NOPB part is unused and in its original packaging.
Return procedure for LM5009SDCX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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