LM25576MHX/NOPB

The LM25576 switching regulator provides all the functions necessary to implement a high-efficiency, high-voltage step-down regulator with a minimum number of external components. This easy-to-use regulator integrates a 42V N-channel buck switch capable of 3A output current. The regulator control method is based on current mode control utilizing an emulated current ramp. Peak current mode control provides inherent line voltage feedforward, cycle-by-cycle current limiting, and simplified loop compensation. The use of an emulated control ramp reduces the noise sensitivity of the PWM circuit, ensuring reliable operation at the extremely small duty cycles required in high input voltage applications. The operating frequency is user-programmable from 50kHz to 1MHz. The oscillator synchronization pin allows multiple LM25576 regulators to self-synchronize or synchronize to an external clock. The output voltage can be as low as 1.225V. Fault protection features include current limiting, thermal shutdown, and remote shutdown capability. The device is offered in a TSSOP-20 package with an exposed pad designed for thermal dissipation. The LM25576 is suitable for a wide range of applications requiring efficient step-down conversion from unregulated high input voltages. The device is ideal for telecom, industrial, and automotive power bus voltage ranges.

Applications

• Automotive
• Industrial

Key features

• Integrated 42V, 170mΩ N-channel MOSFET
• Ultra-wide input voltage range: 6V to 42V
• Adjustable output voltage down to 1.225V
• 1.5% feedback reference accuracy
• Single resistor programmable switching frequency from 50kHz to 1MHz
• Master or slave frequency synchronization
• Adjustable soft-start
• Emulated current mode control architecture
• Wideband error amplifier
• Built-in protection
• LM25576Q is AEC-Q100 Grade 1 qualified for automotive applications (junction temperature range −40°C to +125°C)
• AEC-Q100 Grade 0 qualified automotive datasheet available upon request (junction temperature range −40°C to 150°C)