Monolithic synchronous Buck converter Reduces EMI and enables high power density applications

Linear Technology has announced the LTC7150S, a 20V, 20A monolithic synchronous buck converter with differential VOUT remote sensing. The device’s unique phase lockable controlled on-time constant frequency current mode architecture eases compensation and is ideal for high step-down ratio applications that operate at high frequencies while demanding fast transient response. The device uses Silent Switcher2 technology, including integrated bypass capacitors to deliver a highly efficient solution with excellent EMI performance while easing layout constraints. Multiphase operation with up to 12 phases provides the capability to directly parallel multiple devices for higher current with minimal increase in input and output capacitance. VOUT remote sense ensures that voltage regulation at the load is accurate regardless of load current or board layout. The device’s wide 3.1V to 20V input range supports a wide variety of applications, including most intermediate bus voltages, and is compatible with many battery types. Integrated N-channel MOSFETs deliver continuous load currents as high as 20A with minimal thermal derating, at output voltages ranging from 0.6V to VIN, ideal for point-of-load applications such as powering high current/low voltage DSPs, FPGAs and ASICs. Other applications include telecom/datacom systems, distributed power architectures and general high power density systems. The device’s very low 25ns minimum on-time allows for a high step-down ratio power supply at high frequencies supporting both forced continuous and discontinuous mode operation. The operating frequency is selectable from 400kHz to 3MHz and can be synchronized to an external clock. Its total differential output voltage accuracy is ±1% over the –40C to 125C operating junction temperature range. Additional features include differential remote VOUT sensing directly at the load, PHMODE phase selector pin, accurate 1.2V RUN pin threshold, VIN overvoltage protection, power good and programmable soft-start/tracking.