Overview
The LM3478QMM/NOPB is a high-efficiency low-side N-Channel MOSFET controller designed for switching regulators, manufactured by Texas Instruments. This versatile controller is suitable for various topologies, including boost, flyback, and SEPIC converters. It operates with a wide supply voltage range of 2.97 V to 40 V and supports adjustable switching frequencies from 100 kHz to 1 MHz. The LM3478QMM/NOPB features a fixed frequency, Pulse Width Modulated (PWM) current mode control architecture, which provides superior bandwidth and transient response. It also includes internal soft-start, thermal shutdown, and overvoltage protection, making it a robust solution for power management applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage | 2.97 | - | 40 | V |
| Switching Frequency | 100 kHz | - | 1 MHz | - |
| Peak Driver Output Current | - | - | 1 A | - |
| Junction Temperature Range | -40 | - | 125 | °C |
| Shutdown Current | - | - | 10 µA | - |
| Internal Reference Voltage | - | 1.26 | - | V |
| Thermal Shutdown Temperature | - | - | 165 | °C |
| Thermal Shutdown Hysteresis | - | - | 10 | °C |
Key Features
- Internal Push-Pull Driver With 1-A 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
- Overvoltage Protection (OVP)
- Adjustable Switching Frequency (100 kHz to 1 MHz)
- ±2.5% (Over Temperature) Internal Reference
- Low Shutdown Current (10 µA)
Applications
- Distributed Power Systems
- Battery Chargers
- Offline Power Supplies
- Telecom Power Supplies
- Automotive Power Systems
Q & A
- What is the LM3478QMM/NOPB used for? The LM3478QMM/NOPB is used as a high-efficiency low-side N-Channel MOSFET controller for switching regulators in various power management applications.
- What is the operating voltage range of the LM3478QMM/NOPB? The operating voltage range is from 2.97 V to 40 V.
- What are the adjustable switching frequency ranges of the LM3478QMM/NOPB? The switching frequency can be adjusted between 100 kHz and 1 MHz.
- Does the LM3478QMM/NOPB have overvoltage protection? Yes, it includes overvoltage protection (OVP) to prevent the output voltage from rising beyond a specified limit.
- What is the peak driver output current of the LM3478QMM/NOPB? The peak driver output current is 1 A.
- What is the shutdown current of the LM3478QMM/NOPB? The shutdown current is 10 µA.
- What are the package options for the LM3478QMM/NOPB? It is available in 8-lead VSSOP-8 and SOIC-8 packages.
- Does the LM3478QMM/NOPB support automotive applications? Yes, the LM3478Q-Q1 version is AEC-Q100 qualified and suitable for automotive applications.
- What is the internal reference voltage of the LM3478QMM/NOPB? The internal reference voltage is 1.26 V.
- What is the thermal shutdown temperature of the LM3478QMM/NOPB? The thermal shutdown temperature is 165°C.
