Overview
The LM3487QMM/NOPB is a high-efficiency high-side N-channel MOSFET switching regulator controller produced by Texas Instruments. This controller is designed for use in various switching regulator topologies, including buck, inverting (buck-boost), and zeta regulators. It features an internal push-pull driver that is compatible with a wide range of MOSFETs, making it versatile for different application needs.
The LM3487QMM/NOPB offers a wide input voltage range of 3V to 35V and an adjustable current limit, allowing for optimization in a variety of applications. It also includes an adjustable and synchronizable switching frequency, which can be set between 100kHz and 1.4MHz using a single external resistor or synchronized with an external clock.
Key Specifications
| Parameter | Description |
|---|---|
| Input Voltage Range | 3V to 35V |
| Switching Frequency | Adjustable from 100kHz to 1.4MHz |
| Current Limit | Adjustable cycle-by-cycle current limit |
| Package Type | 10-lead Mini-SO10 (MSOP-10) |
| Shutdown Current | 7µA |
| Thermal Shutdown | Yes |
| Undervoltage Lockout | With hysteresis |
| Frequency Compensation | Optimized with a single capacitor and resistor |
| Soft-Start | External soft-start |
| Output Over Voltage Protection | Yes |
Key Features
- Adjustable and synchronizable switching frequency from 100kHz to 1.4MHz
- Adjustable cycle-by-cycle current limit
- Wide 3V-35V input voltage range
- Thermal shutdown
- Frequency compensation optimized with a single capacitor and resistor
- External soft-start to reduce inrush current
- Current mode operation for superior line and load regulation
- Undervoltage lockout with hysteresis
- Output over voltage protection
- Automotive grade available, including AEC-Q100
Applications
- ADSL Modems
- Local Voltage Regulation
- Distributed Power
- Notebook and Palmtop Computers
- Internet Appliances
- Printers and Office Automation
- Battery operated Devices
- Cable Modems
- Battery Chargers
Q & A
- What is the primary function of the LM3487QMM/NOPB?
The LM3487QMM/NOPB is a high-side N-channel MOSFET switching regulator controller used in various switching regulator topologies.
- What is the input voltage range of the LM3487QMM/NOPB?
The input voltage range is from 3V to 35V.
- How is the switching frequency adjusted?
The switching frequency can be adjusted from 100kHz to 1.4MHz using a single external resistor or synchronized with an external clock.
- What type of package does the LM3487QMM/NOPB come in?
The LM3487QMM/NOPB comes in a 10-lead Mini-SO10 (MSOP-10) package.
- Does the LM3487QMM/NOPB have thermal shutdown protection?
Yes, it includes thermal shutdown protection.
- What is the purpose of the external soft-start feature?
The external soft-start feature is used to reduce inrush current during startup.
- Is the LM3487QMM/NOPB suitable for automotive applications?
Yes, it is available in an automotive grade version, including AEC-Q100.
- How does the current mode operation benefit the regulator?
Current mode operation provides superior line and load regulation and cycle-by-cycle current limiting.
- What is the shutdown current of the LM3487QMM/NOPB?
The shutdown current is 7µA.
- Does the LM3487QMM/NOPB have output over voltage protection?
Yes, it includes output over voltage protection.
