Electronics Weekly
RAA225019 is a six-phase buck converter, designed to work with IMVP9.2 Lunar Lake processors.
Integrated within is the switching controller, power mosfets and current-sensing.
“Six phases can be distributed across three outputs – two SVID rails and one auxiliary rail,” said Renesas. “SVID1 rail operates from a maximum phase count of two to six, while the SVID2 and BUCK3 rails can run either a one-phase or two-phase configuration.”
There is also a low drop-out regulator on-board.
Input range is 2.7 to 4.5V and it switches at up to 2MHz. Packaging is ~5 x 3.7 x 0.5mm 12 x 9 ball WLCSP.
Features include variable switching frequency with load transients, phase shedding and power saving modes at low loads.
To interface a battery to the RAA225019 above, the company has created a three-level buck pre-regulator called RAA489301 (right).
“Seamless” transitions across Vout < Vin/2, Vout = Vin/2 and Vout > Vin/2 are promised,as well as between discontinuous and condtuous conduction modes.
The input voltage range of 4.5 to 24V cover batteries with two to five cells and USB PD adapters, and outputs can span 3 to 24V. If the input voltage matches the output voltage, a bi-directional pass-through mode can connect then directly.
On-board drivers are included for the four external n-channel mosfets required, backed up by an on-board charge pump. Switching is at up to 367kHz.
This part is not quite so application-specific as the six-phase dc-dc IC, and use is also foreseen in USB PD 3.0/3.1 systems, robots, drones and medical equipment.
Packaging is 4 x 4mm 32pad TQFN.
Full data sheets are not public, and the data briefs are scanty. Find the product pages here:
RAA225019
RAA489301
