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Texas Instruments LM5009AMM/NOPB
- Part No.:
- LM5009AMM/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM5009AMM/NOPB.pdf
- Description:
- IC REG BUCK ADJ 150MA 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,096
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Product details
Overview
LM5009AMM/NOPB from Texas Instruments is a 100-V, 150-mA constant ON-time nonsynchronous buck switching regulator with integrated 100-V N-channel buck switch, operating input range 6 V to 95 V, adjustable output from 2.5 V, and no loop compensation required. It serves as a high-voltage bias supply in telecom and automotive post-regulation systems.
For engineers reviewing the LM5009AMM/NOPB datasheet, LM5009AMM/NOPB pinout, LM5009AMM/NOPB application, or LM5009AMM/NOPB equivalent, key selection criteria include input voltage range (6–95 V), ON-time programmability via RT resistor, intelligent current limit OFF-time control via RCL, thermal shutdown at 165°C, and dual-package availability (VSSOP-8 and WSON-8).
Technical Context
The LM5009AMM/NOPB uses a constant ON-time (COT) 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 triggered at 2.875 V.
Current limiting employs a forced OFF-time generator whose duration is set by RCL and inversely proportional to VFB-35 µs at short-circuit (VFB = 0 V), scaling down under partial overload. Startup uses an integrated high-voltage VCC regulator with bypass mode below 8.5 V and regulated 7-V output above, current-limited to 9.2 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6 V to 95 V - supports 42-V automotive and 48-V telecom bus rails with 100-V transient tolerance. |
| Output Current | 150 mA - maximum continuous load current before thermal or current-limit shutdown. |
| Feedback Reference | 2.5 V ±20 mV - precise internal threshold enabling accurate output voltage setting via RFB1/RFB2 divider. |
| ON-Time Control | Programmable via RT resistor; TON = 1.385×10−10 × RT / VIN - ensures frequency stability across input range. |
| Current Limit Threshold | 0.3 A typical - triggers intelligent OFF-time generator to maintain safe operation during overload/short. |
| Thermal Shutdown | 165°C with 25°C hysteresis - disables buck switch until junction cools to ~140°C, preventing catastrophic failure. |
| Package Options | VSSOP-8 (4.0 × 4.0 mm) and WSON-8 (4.0 × 4.0 mm) - thermally enhanced for high-voltage industrial use. |
Pinout & Package
LM5009AMM/NOPB is available in 8-pin VSSOP (DGK) and 8-pin WSON (NGU) packages, both with 4.0 mm × 4.0 mm body size and exposed thermal pad (EP) connected to GND for improved heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switching node | Power switching output connected to inductor, recirculating diode, and bootstrap capacitor; handles full 100-V buck switching transitions. |
| BST (Pin 2) | Bootstrap supply input | Accepts external 0.01-µF ceramic capacitor between BST and SW to sustain gate drive during high-side N-FET conduction. |
| RCL (Pin 3) | Current limit OFF-time set | Resistor to RTN sets forced OFF duration during current limit; 35 µs at VFB = 0 V, scales inversely with VFB. |
| RTN (Pin 4) | Ground reference | Common return for internal circuits, feedback network, and RCL/RT resistors; must be low-impedance connection to system GND. |
| FB (Pin 5) | Feedback input | Connects to resistor divider from VOUT; internal comparator compares to 2.5-V reference to regulate output voltage. |
| RT/SD (Pin 6) | ON-time set / shutdown | Resistor to VIN sets ON time; pulled low (<1.05 V) to enable remote shutdown with <176 µA quiescent current. |
| VCC (Pin 7) | Internal bias regulator output | 7-V regulated output powering gate driver and control logic; requires 0.47-µF local decoupling; current-limited to 9.2 mA. |
| VIN (Pin 8) | Main power input | Accepts 6–95 V DC input; powers internal VCC regulator and high-voltage switch; withstands 100-V transients. |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | Constant ON-time architecture eliminates need for external compensation network, reducing BOM count and layout sensitivity. |
| Ultra-fast transient response | Fixed ON-time + immediate overvoltage termination (at 2.875 V) enables rapid recovery from load steps without phase-margin tuning. |
| Intelligent current limit | OFF-time scales with VFB - 35 µs at short-circuit, shorter under partial overload - minimizing foldback and improving recovery time. |
| Integrated start-up regulator | VCC self-biases from VIN: bypass mode (6–8.5 V), regulated 7-V mode (>8.5 V), eliminating need for auxiliary bias supply. |
| Precharge switch | 150-ns active discharge of SW node during minimum OFF time ensures reliable bootstrap capacitor recharge 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 backplane in base station power modules. IC Role / Device Role / Timing Role: Nonsynchronous buck controller regulating intermediate voltage for downstream point-of-load converters. Use Value: Wide 6–95 V input accommodates brownout and surge conditions; 100-V switch eliminates external HV FET; COT control maintains regulation during fast load transients. | Use Scenario: Stepping down 42-V battery rail to 5-V MCU supply in next-generation electric vehicle domain controllers. IC Role / Device Role / Timing Role: High-voltage buck regulator providing stable low-noise supply for safety-critical microcontrollers and sensors. Use Value: Thermal shutdown (165°C) and intelligent current limit ensure robustness in under-hood environments; small WSON package supports compact ECU layouts. |
| Industrial Sensor Interface | High-Voltage IoT Gateway |
Use Scenario: Powering analog front-ends and signal conditioners in 24–72 V industrial field transmitters. IC Role / Device Role / Timing Role: Primary DC-DC converter delivering regulated 3.3-V or 5-V supply from unregulated factory bus. Use Value: No loop compensation simplifies design for harsh EMI environments; precision 2.5-V reference enables accurate sensor biasing. | Use Scenario: Providing 3.3-V logic supply for cellular/Wi-Fi modules in smart grid edge devices powered from 60-V PoE++ or solar inputs. IC Role / Device Role / Timing Role: Efficient step-down regulator converting high-input DC to low-voltage digital core supply. Use Value: 150-mA output supports modem sleep/wake cycles; low 110–176 µA shutdown current extends battery backup runtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5017MH/NOPB | Wider input range (8–100 V), higher 600-mA output, synchronous rectification, requires loop compensation. | Supports higher loads and tighter ripple specs; suited for space-constrained designs needing >150 mA. | Select when higher output current or synchronous efficiency is required; not drop-in due to different pinout and compensation needs. |
| TPS54160DGQ | Lower max input (60 V), 1.5-A output, adjustable frequency, integrated compensation, smaller 10-pin MSOP package. | Better suited for mid-range industrial supplies; lacks 95-V capability and intelligent current limit OFF-time scaling. | Choose for cost-sensitive 24–48 V systems requiring higher current and simpler layout; not suitable for 42-V automotive or 48-V telecom primary rails. |
Compared with LM5009AMM/NOPB, LM5017MH/NOPB delivers triple the current but adds complexity and cost, while TPS54160DGQ offers higher integration at lower voltage-neither matches the LM5009AMM/NOPB's unique combination of ultra-wide input, zero-compensation simplicity, and intelligent overload handling in compact 8-pin form.
Availability
LM5009AMM/NOPB is available at Aetrix Electronics and suitable for telecom infrastructure, automotive domain controllers, industrial sensor interfaces, and high-voltage IoT gateways requiring stable component supply across extended temperature and voltage ranges.
Supply support for LM5009AMM/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 designing analog ICs, embedded processors, and system solutions for industrial, automotive, and communications markets.
The LM5009A product line delivers high-voltage buck regulators optimized for non-isolated bias conversion in 42-V automotive, 48-V telecom, and wide-input industrial power systems-emphasizing simplicity, reliability, and thermal resilience.
FAQ
What is the minimum ON-time requirement for stable operation of the LM5009AMM/NOPB?
The LM5009AMM/NOPB requires a minimum ON time of 400 ns at maximum input voltage (95 V) to ensure proper current limit functionality and avoid pulse-skipping instability. This constraint determines the upper bound of operating frequency and guides RT resistor selection using the equation TON = 1.385×10−10 × RT / VIN. Designers must verify this condition across worst-case VIN and temperature to maintain regulation integrity in the LM5009AMM/NOPB.
Does the LM5009AMM/NOPB require external loop compensation components?
No, the LM5009AMM/NOPB does not require external loop compensation components. Its constant ON-time (COT) control architecture inherently provides stable regulation without compensation networks-reducing bill-of-materials count and layout sensitivity. The device achieves this through fixed ON-time pulses adjusted inversely with input voltage and immediate overvoltage termination at 2.875 V, making the LM5009AMM/NOPB especially robust in noisy or dynamically varying input environments.
How does the RCL pin function in overload protection for the LM5009AMM/NOPB?
The RCL pin on the LM5009AMM/NOPB sets the forced OFF-time duration during current limit events via an external resistor to RTN. When switch current exceeds 0.3 A, the LM5009AMM/NOPB terminates the ON cycle and initiates an OFF period calculated as TOFF = (VFB / (6.35×10−6 × RCL)) + 0.285 µs. At VFB = 0 V (e.g., output short), this yields 35 µs; at higher VFB, OFF time reduces-enabling faster recovery under partial overload while maintaining safety at 95 V input. This intelligent scaling is intrinsic to the LM5009AMM/NOPB design.
What is the role of the BST pin and its associated capacitor in the LM5009AMM/NOPB?
The BST pin on the LM5009AMM/NOPB supplies gate drive voltage to the internal 100-V N-channel buck switch via an external bootstrap capacitor (typically 0.01 µF ceramic) connected between BST and SW. During each OFF period, the internal diode charges this capacitor from VCC; during ON time, it provides the elevated voltage needed to fully enhance the high-side FET. The LM5009AMM/NOPB includes a 150-ns precharge switch to ensure reliable BST voltage under light-load or precharged-output conditions-critical for consistent switching performance in the LM5009AMM/NOPB.
Can the LM5009AMM/NOPB operate with an input voltage below 6 V?
No, the LM5009AMM/NOPB cannot operate reliably with input voltage below 6 V. Its absolute minimum recommended operating input voltage is 6 V, below which the internal VCC regulator fails to establish stable bias-causing gate drive collapse and loss of regulation. At VIN < 6 V, the VCC bypass switch remains active but insufficient to sustain control circuitry, and startup UVLO (5.3 V) cannot be reached. Operation outside the 6–95 V range violates the LM5009AMM/NOPB's specified operating conditions and risks functional failure.
LM5009AMM/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
LM5009AMM/NOPB FAQ
1.How can I place an order for LM5009AMM/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5009AMM/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 LM5009AMM/NOPB reliable?
The price and inventory of LM5009AMM/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5009AMM/NOPB is usually 5 days.
3.What payment methods are accepted for LM5009AMM/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5009AMM/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5009AMM/NOPB?
LM5009AMM/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5009AMM/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 LM5009AMM/NOPB?
For technical support, including LM5009AMM/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5009AMM/NOPB requirements.
6.How does Aetrix verify that LM5009AMM/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5009AMM/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 LM5009AMM/NOPB meets industry standards.
7.What is the process for return or replacement of LM5009AMM/NOPB?
All LM5009AMM/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5009AMM/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 LM5009AMM/NOPB part is unused and in its original packaging.
Return procedure for LM5009AMM/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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