Step-down controller handles 150 V

The LTC3895 step-down switching-regulator controller from Linear Technology drives an all N-channel synchronous power MOSFET stage. Its 4-V to 140-V (150-V absolute maximum) input range allows the device to operate from a high-input-voltage source or from an input that has high-voltage surges, eliminating the need for external surge-suppression devices. Since the DC/DC controller operates at up to 100% duty cycle during input voltage dips down to 4 V, it is well-suited for transportation, industrial control, robotic, and datacom applications.

Output voltage can be set from 0.8 V to 60 V at output currents of up to 20 A with efficiencies as high as 96%. Power consumption in sleep mode is just 40 µA with the output voltage in regulation, which is useful for always-on systems.

The LTC3895’s 1-Ω MOSFET gate drivers can be adjusted from 5 V to 10 V to allow the use of logic-level or standard MOSFETs. To prevent high on-chip power dissipation in high-input-voltage applications, the part includes an NDRV pin, which drives the gate of an optional external N-channel MOSFET acting as a low-dropout linear regulator to supply IC power. Other features include a fixed 5-V or 3.3-V output option, an integrated bootstrap diode, power-good output signal, adjustable input overvoltage lockout, and soft start.