Highly integrated point-of-load DC-DC converters boost power density

June 26, 2019 //By Nick Flaherty
Silanna Semiconductor has launched a family of highly integrated synchronous point-of-load DC-DC buck converters.
Silanna Semiconductor has launched a family of highly integrated synchronous point-of-load (PoL) DC-DC buck converters.

The SZPL8216A point-of-load DC-DC buck converters integrate the functions of the DC-DC constant-on-time (COT) controller, output gate drivers and output power blocks in a 3 x 4mm QFN package.The devices enable designers to achieve ultra-compact PCB layout, high power density and high efficiency for low power loss in demanding and space-constrained applications such as enterprise servers, telecommunications, and networking equipment.

The SZPL8216A-A, SZPL8216A-B and SZPL8216A-C devices deliver up to 12A with 94% peak efficiency when converting from a nominal 12V input down to a 0.6V to 5.5V output voltage range. Providing design versatility, the devices feature a selectable switching frequency, 600kHz to 1MHz, allowing users to make design-specific decisions to optimize their component size versus efficiency. With the ability to operate at 1MHz, designers can use a smaller output filter to minimize their total PCB size.

Other features of the point-of-load converters include programmable current limit and soft start time; remote output voltage sensing; pre-biased start-up and a full suite of robust power supply protection features including UVLO/OCP/OVP/UVP and OTP. Providing additional design versatility, the devices may operate from a single supply using their internal LDOs, or designers may bypass them and instead use an external 3.3 V or 5 V bias supply to increase conversion efficiency further.

The SZPL8216A COT controlled devices employ Silanna’s proprietary S-Loop control architecture which provides near instantaneous response to load transitions with minimal increase in overshoot or undershoot. Such performance is critical for multi-core CPU and FPGA applications that quickly power on and off with high current load transients and require a very stable power supply voltage.

The family includes three different versions, all packaged in the same 21-lead, 3mmx4mm QFN package, allowing for different fault mode behaviors, voltage references, and AVCC operating voltages: 
SZPL8216A-AE34: Latched Fault Mode; VREF 0.9 V; AVCC 3.3 V 
SZPL8216A-BE34: Hiccup Fault Mode;    VREF 0.6 V; AVCC 3.3 V 
SZPL8216A-CE34: Hiccup Fault Mode;    VREF 0.6 V; AVCC 5.0 V

Sample quantities are available now.


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