5.5V, 12.5A Synchronous Step-Down Silent Switcher 2 for Commercial Space

The RHP50000-CSL is a very small, low noise, monolithic step-down DC/DC converter capable of providing up to 12.5A of output current from a 2.25V to 5.5V input supply. The device employs Silent Switcher 2 architecture with internal hot loop bypass capacitors to achieve both low EMI and high efficiency at switching frequencies as high as 5MHz. For systems with higher power requirements, multi-phasing parallel converters is readily implemented.

The RHP50000-CSL uses a constant frequency, peak current mode control architecture for fast transient response. A 500mV reference allows for low voltage outputs. 100% duty cycle operation delivers low drop out.

Other features include a power good signal when the output is in regulation, precision enable threshold, output overvoltage protection, thermal shutdown, a temperature monitor, clock synchronization, mode selection and output short circuit protection. The device is available in a compact 18-lead 3mm × 3mm LQFN package.

APPLICATIONS

* Low Earth Orbit (LEO) Satellites

* Avionics

* Point-to-Point Communication Systems

* Distributed DC Power Systems (Point-of-Load)

* FPGA, ASIC, μP Core Supplies

* No Single-Event Latch-Up (SEL) up to 47.0 MeV·cm2/mg at VIN ≤ 3.6V

* Total Ionizing Dose (TID) Assured up to 30krad(Si)

* Silent Switcher®2 Architecture: Ultralow EMI Emissions

* High Efficiency—4.5mΩ NMOS and 16mΩ PMOS

* Wide Bandwidth, Fast Transient Response

* Safely Tolerates Inductor Saturation in Overload

* VIN Range: 2.25V to 5.5V

* VOUT Range: 0.5V to VIN