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Texas Instruments LM5009ASDX/NOPB
- Part No.:
- LM5009ASDX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
LM5009ASDX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 150MA 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,967
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Product details
Overview
LM5009ASDX/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 LM5009ASDX/NOPB datasheet, LM5009ASDX/NOPB pinout, LM5009ASDX/NOPB application, or LM5009ASDX/NOPB equivalent, key selection criteria 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) for thermal-sensitive designs.
Technical Context
The LM5009ASDX/NOPB implements a constant ON-time (COT) control scheme where ON time varies inversely with VIN, enabling stable switching frequency across line and load variations without external compensation. Its internal 100-V N-channel buck switch eliminates external high-voltage FET requirements.
Regulation relies on a precision 2.5-V internal reference compared against FB voltage; overvoltage protection triggers at 2.875 V. Current limiting uses an intelligent OFF-time generator whose duration is set by RCL and inversely proportional to VFB-ensuring short-circuit safety while minimizing foldback during overload.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6 V to 95 V - supports wide-range industrial, telecom, and 42-V automotive bus inputs without pre-regulation. |
| Output Current | 150 mA max - sufficient for bias rails, microcontroller cores, and isolated gate drivers in high-voltage systems. |
| Switching Frequency | 50 kHz to 1.1 MHz - programmable via RT resistor; remains stable across input and load due to COT architecture. |
| Current Limit Threshold | 0.3 A typical - protects internal MOSFET under overload; OFF-time scales with VFB to reduce foldback severity. |
| Feedback Reference | 2.5 V ±2% - enables precise output regulation using standard resistor dividers; low 100 nA bias current minimizes divider error. |
| Thermal Shutdown | 165 °C with 25 °C hysteresis - prevents catastrophic failure; resumes operation only after junction cools to ~140 °C. |
| VCC Regulator Output | 7 V regulated - powers internal gate driver and logic; bypassed below 8.5 V VIN to improve light-load efficiency. |
Pinout & Package
LM5009ASDX/NOPB is available in 8-pin WSON (4 mm × 4 mm) with exposed thermal pad, optimized for high-power-density layouts and improved thermal performance over VSSOP. Pin functions are validated per TI SNVS608H datasheet Rev H.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switching node | Connects to inductor, bootstrap capacitor (C4), and recirculating diode; carries full switching current and high dv/dt. |
| BST (Pin 2) | Bootstrap supply input | Accepts external 0.01-µF ceramic capacitor to SW; charges during OFF time via internal diode from VCC for high-side gate drive. |
| RCL (Pin 3) | Current limit OFF-time set | Resistor-to-RTN sets forced OFF duration during overcurrent; 35 µs max when FB = 0 V (short-circuit condition). |
| RTN (Pin 4) | Power ground | System return path for internal regulators, feedback circuitry, and current sense; must be low-impedance connection to PCB ground plane. |
| FB (Pin 5) | Feedback input | Compares output voltage (via resistor divider) to 2.5-V internal reference; 100 nA bias current allows high-value dividers. |
| RT/SD (Pin 6) | ON-time set / shutdown | Resistor-to-VIN programs ON time; pulled to GND to disable regulator with <1.05 V threshold and 35 mV hysteresis. |
| VCC (Pin 7) | Internal bias regulator output | 7-V regulated supply for gate driver and logic; requires 0.47-µF local decoupling; current-limited to 9.2 mA. |
| VIN (Pin 8) | Main power input | Accepts 6–95 V DC; withstands 100-V transients; powers internal startup regulator and high-voltage switch. |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | Constant ON-time control eliminates need for external compensation network-reducing BOM count and layout sensitivity. |
| Ultra-fast transient response | Direct ON-time modulation enables immediate reaction to load steps without phase-margin constraints of voltage-mode control. |
| Intelligent current limit | OFF-time scales with FB voltage-provides longer fault hold-off during shorts (35 µs), shorter recovery during mild overloads. |
| Integrated 100-V N-channel switch | Eliminates external high-voltage MOSFET and associated gate-drive complexity-simplifying design and reducing footprint. |
| Thermally enhanced WSON package | 4 mm × 4 mm WSON with exposed pad achieves 42.8 °C/W junction-to-ambient thermal resistance-enabling higher power density. |
Applications
| Telecom Bias Supply | Automotive Post-Regulator |
|---|---|
|
Use Scenario: Generating 3.3 V or 5 V bias rails from 48 V telecom backplane in remote radio units and base station controllers. IC Role / Device Role / Timing Role: Primary nonsynchronous buck converter providing isolated secondary power with minimal external components. Use Value: Wide 6–95 V input accommodates brownouts and surges; no compensation simplifies qualification for ETSI-compliant telecom equipment. |
Use Scenario: Stepping down 42 V battery rail to 12 V or 5 V for infotainment ECUs, ADAS sensors, and body control modules. IC Role / Device Role / Timing Role: High-input-voltage buck regulator delivering stable low-noise supply under cold-crank and load-dump conditions. Use Value: 100-V switch rating and 165 °C thermal shutdown ensure robustness in under-hood environments with ambient up to 125 °C. |
| Industrial HVDC Converter | LED Driver Auxiliary Supply |
|
Use Scenario: Converting 24–72 V DC industrial bus to 15 V for PLC I/O modules, motor drivers, and fieldbus transceivers. IC Role / Device Role / Timing Role: Compact, self-contained buck regulator replacing discrete high-voltage solutions with lower bill-of-materials cost. Use Value: Adjustable output (≥2.5 V) and 150 mA capability support multiple rail requirements; WSON package enables compact DIN-rail mount designs. |
Use Scenario: Providing isolated 12 V auxiliary power for LED string controllers and dimming ICs in streetlight and architectural lighting systems. IC Role / Device Role / Timing Role: Secondary-stage buck regulator powered from main LED driver's intermediate bus (e.g., 60 V). Use Value: Fast transient response maintains stable gate drive during PWM dimming transitions; low quiescent current extends standby efficiency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5009MMX/NOPB | Same die, 8-pin VSSOP package (157.7 °C/W θJA); lacks exposed thermal pad; lower thermal performance than WSON. | Suitable for lower-power or space-constrained layouts where thermal margin exceeds 157.7 °C/W requirement. | Select LM5009MMX/NOPB only if board-level thermal management ensures junction temperature stays ≤125 °C at full load. |
| LM5164QDDARQ1 | Automotive-grade (AEC-Q100), 100-V input, 300-mA output, integrated soft-start and spread-spectrum; requires compensation. | Designed for automotive safety-critical systems requiring ASIL-B compliance and extended temperature validation. | Choose LM5164QDDARQ1 when functional safety certification, higher output current, or EMI reduction features are mandatory. |
Compared with LM5009ASDX/NOPB, LM5009MMX/NOPB offers identical electrical specs but inferior thermal dissipation, while LM5164QDDARQ1 adds automotive qualification and higher current at the cost of increased design complexity and BOM count.
Availability
LM5009ASDX/NOPB is available at Aetrix Electronics and suitable for telecom infrastructure, automotive electronics, industrial HVDC conversion, and LED lighting systems requiring stable component supply across long production lifecycles.
Supply support for LM5009ASDX/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, with decades of expertise in high-reliability power conversion ICs.
The LM5009A product line delivers high-input-voltage buck regulators for demanding applications including 48-V telecom, 42-V automotive, and industrial HVDC-designed to simplify high-voltage power system design while maintaining efficiency and reliability.
FAQ
What is the minimum ON-time specification for LM5009ASDX/NOPB and why does it matter?
The LM5009ASDX/NOPB specifies a minimum ON-time of 400 ns at maximum input voltage (95 V). This value ensures reliable current limit detection and proper gate driver timing under worst-case conditions. If the programmed ON-time falls below this threshold-due to excessive RT resistor value or high VIN-the current limit function may not activate correctly, risking MOSFET overstress during faults. Designers must verify ON-time using TON = 1.385×10−10 × RT/VIN and maintain margin above 400 ns across the full operating range.
Can LM5009ASDX/NOPB operate in continuous conduction mode (CCM) across its full load range?
LM5009ASDX/NOPB operates in discontinuous conduction mode (DCM) at light loads and transitions to continuous conduction mode (CCM) as load increases. CCM begins when inductor current no longer falls to zero between switching cycles-typically above ~50–70 mA depending on VIN, VOUT, and L1 value. The device supports both modes inherently; no configuration is needed. In CCM, switching frequency remains relatively constant, while in DCM it decreases with load-maintaining high efficiency at light loads without requiring pulse-skipping or burst-mode control.
How does the RCL resistor affect short-circuit protection behavior in LM5009ASDX/NOPB?
The RCL resistor directly sets the forced OFF-time duration during current-limit events in LM5009ASDX/NOPB. When FB = 0 V (e.g., output shorted), RCL establishes a fixed 35 µs OFF period regardless of load-ensuring safe energy dissipation and preventing thermal runaway at 95 V input. At partial overloads where FB > 0 V, OFF-time reduces proportionally (per TOFF = 0.285 + 10−5/(6.35×10−6 × RCL × VFB)), enabling faster recovery than fixed-timer schemes. Selecting RCL requires balancing short-circuit safety (higher RCL → longer OFF) against overload responsiveness (lower RCL → shorter OFF).
Is an external bootstrap capacitor required for LM5009ASDX/NOPB, and what are its specifications?
Yes, LM5009ASDX/NOPB requires an external 0.01-µF ceramic capacitor between BST and SW pins. This capacitor supplies gate drive voltage to the internal N-channel MOSFET during ON-time. TI specifies X7R or better dielectric, 50-V rating minimum, placed within 2 mm of the pins with low-inductance layout. The capacitor recharges through an internal diode from VCC during each OFF-time; the 300 ns minimum OFF timer ensures adequate recharge time. Omitting or undersizing this capacitor causes gate drive collapse, leading to erratic switching or thermal failure.
Does LM5009ASDX/NOPB support remote shutdown, and how is it implemented?
Yes, LM5009ASDX/NOPB supports remote shutdown via the RT/SD pin (Pin 6). Driving this pin to GND disables the regulator with a rising-threshold of 0.4–1.05 V and 35 mV hysteresis. During shutdown, the internal buck switch turns off, VCC bypass is disabled, and quiescent current drops to 110–176 µA. The pin can also be used for undervoltage lockout by connecting a resistor divider from VIN-allowing programmable turn-on voltage. No pull-up is required; internal bias ensures defined state when floating.
LM5009ASDX/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):
- 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-WSON (4x4)
LM5009ASDX/NOPB FAQ
1.How can I place an order for LM5009ASDX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5009ASDX/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 LM5009ASDX/NOPB reliable?
The price and inventory of LM5009ASDX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5009ASDX/NOPB is usually 5 days.
3.What payment methods are accepted for LM5009ASDX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5009ASDX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5009ASDX/NOPB?
LM5009ASDX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5009ASDX/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 LM5009ASDX/NOPB?
For technical support, including LM5009ASDX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5009ASDX/NOPB requirements.
6.How does Aetrix verify that LM5009ASDX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5009ASDX/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 LM5009ASDX/NOPB meets industry standards.
7.What is the process for return or replacement of LM5009ASDX/NOPB?
All LM5009ASDX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5009ASDX/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 LM5009ASDX/NOPB part is unused and in its original packaging.
Return procedure for LM5009ASDX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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