20V synchronous buck regulator reduces EMI in high power applications
The LTC7150 uses a 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 Switcher 2 technology, including integrated bypass capacitors to improve 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. The VOUT remote sense ensures that voltage regulation at the load is accurate regardless of load current or board layout. The LTC7150S’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 V IN , 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 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 and the total differential output voltage accuracy is ±1% over the –40°C to 125°C operating junction temperature range.
Additional features include differential remote VOUT sensing directly at the load, phase selector pin, accurate 1.2VRUN pin threshold, VIN overvoltage protection, power good and programmable soft-start/tracking.
The LTC7150S is available in a thermally enhanced 42-lead 5mm × 6mm × 1.3mm BGA package, in both RoHS lead-free and leaded SnPb (63/37) finishes. The E and I grades are specified from –40°C to 125°C operating junction temperature range. The 1,000-piece price starts at $5.60 each for the E grade.