Overview
The LM3488MMX-NS, produced by National Semiconductor (now part of Texas Instruments), is a versatile low-side N-FET high-performance controller designed for switching regulators. This device is suitable for use in various topologies such as boost, flyback, and SEPIC converters. It operates at extremely high switching frequencies, allowing for reduced overall solution size. The LM3488MMX-NS features current mode control, providing superior bandwidth and transient response, along with cycle-by-cycle current limiting and internal soft-start to limit inrush current at start-up.
Key Specifications
| Specification | Value |
|---|---|
| Supply Voltage Range | 2.97V to 40V |
| Switching Frequency | 100kHz to 1MHz (adjustable and synchronizable) |
| Internal Reference Accuracy | ±1.5% (over temperature) |
| Shutdown Current | 5µA (over temperature) |
| Package Type | 8-lead Mini-SO8 (MSOP-8) |
| Peak Drive Current | 1A |
Key Features
- Internal push-pull driver with 1A peak current capability
- Current limit and thermal shutdown
- Frequency compensation optimized with a capacitor and a resistor
- Internal soft-start
- Current mode operation
- Undervoltage lockout with hysteresis
- Power-saving shutdown mode reducing supply current to 5µA
- AEC-Q100 qualified (for LM3488Q variants)
Applications
- Distributed Power Systems
- Notebooks, PDAs, Digital Cameras, and other Portable Applications
- Offline Power Supplies
- Set-Top Boxes
- Automotive Start-Stop Applications and ADAS Driver Information Systems
- One Cell/Two Cell Li-ion Battery Powered Portable Bluetooth Audio Systems
- Boost for Audio Amplifiers
Q & A
- What is the supply voltage range of the LM3488MMX-NS?
The supply voltage range is from 2.97V to 40V. - How can the switching frequency of the LM3488MMX-NS be adjusted?
The switching frequency can be adjusted to any value between 100kHz and 1MHz using a single external resistor or by synchronizing it to an external clock. - What is the accuracy of the internal reference voltage?
The internal reference voltage has an accuracy of ±1.5% over temperature. - What is the shutdown current of the LM3488MMX-NS?
The shutdown current is 5µA over temperature. - What type of package does the LM3488MMX-NS come in?
The LM3488MMX-NS comes in an 8-lead Mini-SO8 (MSOP-8) package. - What is the peak drive current capability of the internal driver?
The peak drive current capability is 1A. - Does the LM3488MMX-NS have built-in protection features?
Yes, it includes current limit, thermal shutdown, short-circuit protection, and overvoltage protection. - What is the purpose of the internal soft-start feature?
The internal soft-start feature limits the inrush current at start-up. - Can the LM3488MMX-NS be used in automotive applications?
Yes, the LM3488Q variants are AEC-Q100 qualified and suitable for automotive applications. - How does the LM3488MMX-NS handle power supply sequencing?
The power-saving shutdown mode allows for power supply sequencing.
