Overview
The LM5009 is a high-voltage, step-down switching regulator produced by Texas Instruments (formerly National Semiconductor). This device is designed to provide a low-cost and efficient buck regulator solution. It features an integrated 100-V N-channel buck switch and operates over a wide input voltage range of 9.5 V to 95 V, with transient capability up to 100 V. The LM5009 is available in 8-pin VSSOP and thermally enhanced 8-pin WSON packages.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 9.5 to 95 | V |
| Output Current Capability | 150 | mA |
| Switching Frequency | Up to 600 kHz | - |
| Output Voltage Accuracy | 2% accurate 2.5 V | - |
| Operating Temperature Range | –40°C to +125°C | - |
| Package Types | 8-pin VSSOP, 8-pin WSON | - |
| Maximum Junction Temperature | 125°C | - |
Key Features
- Integrated 100-V N-channel buck switch
- No loop compensation required
- Ultra-fast transient response
- VIN feedforward provides constant operating frequency
- Highly efficient operation
- Internal start-up regulator
- Intelligent current limit protection
- External shutdown control
- Thermal shutdown
- Maximum duty cycle limit timer
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, with transient capability up to 100 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 typical switching frequency of the LM5009?
The switching frequency of the LM5009 can exceed 600 kHz.
- How accurate is the output voltage of the LM5009?
The output voltage of the LM5009 is 2% accurate at 2.5 V 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.
- What is the maximum junction temperature for the LM5009?
The maximum junction temperature for the LM5009 is 125°C.
- Does the LM5009 have thermal protection?
- Can the LM5009 be remotely disabled?
- What are some common applications of the LM5009?
The LM5009 is commonly used in heat sink elimination for linear regulators, rectified AC systems, non-isolated AC mains supplies, LED current sources, and in telecom and automotive power bus ranges.
