Overview
The LM5022MM/NOPB from Texas Instruments is a high-voltage, low-side, N-channel MOSFET controller designed for use in boost and SEPIC regulators. This device is part of the LM5022 family and is packaged in a 10-pin VSSOP (Very Thin Small Outline Package). It features a wide input voltage range of 6 V to 60 V, with the ability to operate down to 3 V after start-up. The LM5022MM/NOPB includes a high-voltage start-up regulator, a 1-A peak MOSFET gate driver, and supports current-mode control, which simplifies loop compensation and provides inherent input voltage feedforward.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 6 to 60 | V |
| Operating Temperature Range | -40 to 125 | °C |
| Oscillator Frequency Range | Up to 2.2 | MHz |
| MOSFET Gate Driver Peak Current | 1 | A |
| Duty Cycle Limit | 90% | |
| Package Type | 10-Pin VSSOP | |
| Junction-to-Ambient Thermal Resistance | 161.5 | °C/W |
| Thermal Shutdown Threshold | 165 | °C |
Key Features
- Internal 60-V start-up regulator
- 1-A Peak MOSFET gate driver
- Programmable undervoltage lockout (UVLO) with hysteresis
- Cycle-by-cycle current limit
- External synchronizable (AC-coupled)
- Single resistor oscillator frequency set
- Slope compensation
- Adjustable soft start
- Error amplifier and precision reference
- Thermal shutdown protection
Applications
The LM5022MM/NOPB is ideal for use in various power converter topologies, including:
- Boost converters
- SEPIC (Single-Ended Primary-Inductor Converter) converters
Q & A
- What is the input voltage range of the LM5022MM/NOPB?
The input voltage range is 6 V to 60 V, with operation possible down to 3 V after start-up. - What is the maximum oscillator frequency of the LM5022MM/NOPB?
The oscillator frequency can be set up to 2.2 MHz. - What is the peak current capability of the MOSFET gate driver?
The MOSFET gate driver can source and sink a peak current of 1 A. - Does the LM5022MM/NOPB support external synchronization?
Yes, it supports external synchronization (AC-coupled). - What is the thermal shutdown threshold of the LM5022MM/NOPB?
The thermal shutdown threshold is typically 165°C. - What package type is the LM5022MM/NOPB available in?
The device is available in a 10-pin VSSOP package. - Does the LM5022MM/NOPB have built-in slope compensation?
Yes, it includes slope compensation to prevent subharmonic oscillation in current-mode control circuits. - How is the oscillator frequency set in the LM5022MM/NOPB?
The oscillator frequency is set using a single external resistor connected between the RT/SYNC and GND pins. - What protection features does the LM5022MM/NOPB include?
The device includes cycle-by-cycle current limit, thermal shutdown, and undervoltage lockout with hysteresis. - Can the LM5022MM/NOPB be used in isolated applications?
Yes, it can be used in isolated applications such as boost converters, with the output voltage connected to the FB pin through a resistor divider.
