Overview
The LM5009MM, produced by Texas Instruments, is a wide input, 100-V, 150-mA step-down switching regulator. This high-voltage regulator is designed to implement a low-cost, efficient buck bias power converter. It features an integrated N-channel MOSFET and is available in VSSOP-8 and thermally-enhanced WSON-8 packages. The regulator uses a control scheme with an on-time inversely proportional to the input voltage (VIN), eliminating the need for loop compensation. It also includes several protection features such as thermal shutdown, VCC undervoltage lockout, and gate drive undervoltage lockout, making it suitable for various high-voltage applications.
Key Specifications
| Parameter | Value |
|---|---|
| Control Mode | Constant on-time (COT) |
| Maximum Duty Cycle | 99% |
| Maximum Output Current (Iout) | 150 mA |
| Typical Quiescent Current (Iq) | 0.485 mA |
| Operating Temperature Range | -40°C to 125°C |
| Package Type | VSSOP, WSON |
| Number of Regulated Outputs | 1 |
| Maximum Switching Frequency | 600 kHz |
| Minimum Switching Frequency | 50 kHz |
| Minimum Input Voltage (Vin) | 9.5 V |
| Maximum Input Voltage (Vin) | 95 V |
| Minimum Output Voltage (Vout) | 2.5 V |
| Maximum Output Voltage (Vout) | 85 V |
Key Features
- Integrated N-channel MOSFET and associated floating high-voltage gate driver.
- Constant on-time control scheme, eliminating the need for loop compensation.
- Thermal shutdown, VCC undervoltage lockout, and gate drive undervoltage lockout for enhanced protection.
- Maximum duty cycle limit timer and intelligent current limit off timer.
- Short-circuit protection with minimum foldback.
- Enable pin for easy control.
Applications
The LM5009MM is well-suited for various high-voltage applications, including 48-V telecom and 42-V automotive power bus ranges. It can be used in any system requiring efficient regulation of higher input voltages down to a stable output voltage.
Q & A
- What is the maximum input voltage of the LM5009MM?
The maximum input voltage is 95 V. - What is the maximum output current of the LM5009MM?
The maximum output current is 150 mA. - What control scheme does the LM5009MM use?
The LM5009MM uses a constant on-time (COT) control scheme. - What are the available package types for the LM5009MM?
The available package types are VSSOP-8 and WSON-8. - What is the operating temperature range of the LM5009MM?
The operating temperature range is -40°C to 125°C. - Does the LM5009MM have built-in protection features?
Yes, it includes thermal shutdown, VCC undervoltage lockout, and gate drive undervoltage lockout. - What is the typical quiescent current of the LM5009MM?
The typical quiescent current is 0.485 mA. - What are the minimum and maximum switching frequencies of the LM5009MM?
The minimum switching frequency is 50 kHz, and the maximum is 600 kHz. - Is the LM5009MM suitable for automotive applications?
Yes, it is suitable for 42-V automotive power bus ranges. - How does the LM5009MM handle short-circuit protection?
The LM5009MM implements short-circuit protection with minimum foldback using forced off-time that is inversely proportional to VOUT.
