PAC5225
Power Application Controller
9. PIN DESCRIPTION
Table 4. Multi-Mode Power Manager and System Pin Description
PIN
NUMBER
PIN NAME
TYPE
Analog
Analog
Power
DESCRIPTION
Switching supply current sense input. Connect to the positive side of the current
sense resistor.
CSM
DRM
17
Switching supply driver output. Connect to the base or gate of the external power
NPN or n-channel MOSFET. See PAC User Guide and application notes.
20
Exposed pad. Must be connected to VSS in a star ground configuration. Connect to
a large PCB copper area for power dissipation heat sinking.
EP (VSS)
EP
PA7/PWMA5/PWMA7/
PWMC1/CLKOUT
Timer A, PWM/Capture 7; Timer A, PWM/Capture 5; Timer C, PWM/Capture 1,
Low-speed Clock Output.
33
47
16
Digital
Power
Power
VSS
Ground.
System regulator output. Connect to VSYS directly or through an external power-
dissipating resistor.
REGO
Internally generated 1.8V core power supply. Connect a 2.2μF or higher value
ceramic capacitor from VCC18 to VSSA. See Figure 9-1. Power Supply Bypass
Capacitor Routing below.
VCC18
VCC33
VCCIO
48
4
Power
Power
Power
Internally generated 3.3V power supply. Connect a 2.2μF or higher value ceramic
capacitor from VCC33 to VSSA. See PCB layout note below.
Internally generated digital I/O power supply. Connect a 4.7μF or higher value
ceramic capacitor from VCCIO to VSSA. See Figure 9-1. Power Supply Bypass
Capacitor Routing below.
46
Switching supply controller supply input. Connect a 1μF or higher value ceramic
capacitor, or a 0.1μF ceramic capacitor in parallel with a 10μF or higher
electrolytic capacitor from VHM to VSSP. This pin requires good capacitive
bypassing to VSSP, so the ceramic capacitor must be connected with a shorter than
10mm trace from the pin. See Figure 9-1. Power Supply Bypass Capacitor
Routing below.
VHM
19
Power
Main power supply. Provides power to the power drivers as well as voltage
feedback path for the switching supply. Connect a properly sized supply bypass
capacitor in parallel with a 0.1μF ceramic capacitor from VP pin to VSS for voltage
loop stabilization. This pin requires good capacitive bypassing to VSS, so the
ceramic capacitor must be connected with a shorter than 10mm trace from the pin.
See See Figure 9-1. Power Supply Bypass Capacitor Routing below.
VP
18
15
Power
Power
5V system power supply. Connect a 4.7μF or higher value ceramic capacitor from
VSYS to VSSP. See Figure 9-1. Power Supply Bypass Capacitor Routing below.
VSYS
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Rev 2.0‒September 22, 2017
ACTIVE-SEMI [ ACTIVE-SEMI, INC ]
