PAC5232 datasheet(21/66 Pages) ACTIVE-SEMI

21 / 66 page

Power Application Controller

-21-

Rev 1.1

6-Jan-2018

The Rectifier Diode (Dr) must be a low QRR diode.

10.4

Medium-Voltage Buck Regulator (MV-BUCK)

The PAC5232 contains a Medium-Voltage Buck Switching Regulator that generates a 5V, 200mA supply

for the device, as well as PCB functions.

The SW pin is the switch node of the Buck regulator. The Power MOSFET is integrated, so connect this

pin to VSYS through an external inductor. The VSYS pin is the 5V regulator output, which should be

bypassed to ground.

Figure 10-3 MV-BUCK Switching Regulator Example

PAC5232

VSYS

The output of VSYS is fixed at 5V and the switching frequency is 1.33MHz. This regulator supplies at

least 200mA. This buck regulator offers better thermal and efficiency performance.

10.5

Linear Regulators

The CPM includes three additional linear regulators. VSYS supplies these three regulators. Once VSYS

is above 4.5V, these three additional 40mA linear regulators for VCCIO, VCC33, and VCORE supplies

sequentially power up.

Figure 10-4 Linear Regulators Example

PAC5232

VCC33

VCCIO

VCORE

VSS

2.2F

4.7F

The figure above shows typical circuit connections for the linear regulators. The VCCIO regulator

generates a dedicated 3.3V supply for IO. The VCC33 and VCORE regulators generate 3.3V and 1.9V,

respectively. When VSYS, VCCIO, VCC33, and VCORE are all above their respective power good

thresholds, and the configurable power on reset duration has expired, the microcontroller is initialized.

3 Note that the VCORE LDO may not have any addition load on it from the PCB. The only components

connected to VCORE should be a bypass capacitor to ground.

PAC5232 Datasheet(PDF) 21 Page - Active-Semi, Inc