LM5005MHX

• Integrated 75V, 2.5A N-channel buck switch
• The ultra-wide input voltage range is from 7V to 75V
• Internal high-voltage bias regulation
• Adjustable output voltage from 1.225V
• 1.5% feedback reference accuracy
• Current mode control and simulation of inductor current ramps
• Single-resistor oscillator frequency setting
• Oscillator synchronized input
• Programmable soft start
• Shutdown/standby input
• Wide bandwidth error amplifier
• Thermal shutdown

illustrate

The LM5005 High Voltage Switching Regulator has all the necessary features to achieve an efficient high voltage buck regulator that uses minimal external components. This easy-to-use regulator includes a 75V N-channel buck switch with 2.5 amp current output capability. The regulator is controlled by using a simulated current ramp control based on the current pattern. Current mode control provides line-specific feedforward, cycle-by-cycle current limiting, and simplified loop compensation. The sensitivity of the pulse-width modulation circuit to reduce noise using an emulation control ramp allows for very small duty cycles necessary for reliable control in high input voltage applications. Programmable operating frequency from 50kHz to 500kHz. The oscillator sync pin allows multiple LM5005 regulators to automatically synchronize operation or synchronize to one external clock. Other protection features include current limiting, thermal shutdown, and remote shutdown capabilities. The enhanced TSSOP-20 package is available in power devices with an exposed chip bonding pad to help dissipate heat.