Overview
The LM5009SDCX from Texas Instruments is a wide input, non-synchronous buck switching regulator designed for high efficiency and ease of use. This device is part of the LM5009 family and is packaged in an 8-pin VSSOP or thermally enhanced 8-pin WSON package. It features an integrated N-channel MOSFET and is capable of driving a 150-mA load current from an input voltage range of 9.5 V to 95 V. The regulator is known for its ultra-fast transient response and does not require loop compensation, making it a straightforward solution for various power conversion needs.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 9.5 to 95 | V |
| Output Current Capability | 150 | mA |
| Switching Frequency | Up to 600 kHz | - |
| Feedback Voltage | 2.5 | V |
| Maximum Duty Cycle | - | - |
| Package Types | 8-pin VSSOP, 8-pin WSON | - |
| Operating Temperature Range | –40°C to +125°C | - |
| Thermal Shutdown Temperature | Typically 165°C | - |
Key Features
- Integrated N-channel MOSFET for high efficiency and ease of use.
- Ultra-fast transient response.
- No loop compensation required.
- VIN feedforward provides constant operating frequency.
- Switching frequency can exceed 600 kHz.
- Highly efficient operation.
- 2% accurate 2.5-V feedback voltage from –40°C to +125°C.
- Internal start-up regulator.
- Intelligent current limit protection.
- External shutdown control.
- Thermal shutdown protection.
Applications
- Heat sink eliminator for classic linear regulator applications.
- 12-V, 24-V, 36-V, and 48-V rectified AC systems.
- Non-isolated AC mains charge-coupled supplies.
- LED current source.
- 48-V telecom and 42-V automotive power bus ranges.
Q & A
- What is the input voltage range of the LM5009?
The input voltage range of the LM5009 is from 9.5 V to 95 V.
- What is the maximum output current capability of the LM5009?
The LM5009 can drive a load current of up to 150 mA.
- Does the LM5009 require loop compensation?
No, the LM5009 does not require loop compensation.
- What is the feedback voltage accuracy of the LM5009?
The feedback voltage is accurate to within 2% over the temperature range of –40°C to +125°C.
- What are the package options for the LM5009?
The LM5009 is available in 8-pin VSSOP and 8-pin WSON packages.
- How does the thermal shutdown feature work in the LM5009?
The LM5009 has an internal thermal shutdown circuit that disables the buck switch if the junction temperature exceeds 165°C. Normal operation resumes when the temperature drops below 140°C.
- Can the LM5009 be used in high-voltage applications?
- What type of MOSFET is integrated into the LM5009?
The LM5009 integrates an N-channel MOSFET.
- How does the intelligent current limit protection work in the LM5009?
The LM5009 has an intelligent current limit off timer that terminates the current cycle and initiates an off-time period if the current exceeds 0.31 A. The off-time is controlled by an external resistor and the feedback voltage.
- Can the LM5009 be remotely shut down?
