PAC5220 Datasheet, PDF (14/73 Pages) Active-Semi, Inc – Power Application Controller

PAC5220
Power Application Controller
9. PIN DESCRIPTION
Table 9-1. Multi-Mode Power Manager and System Pin Description
PIN
NAME
PIN NUMBER
TYPE
DESCRIPTION
CSM
20
Analog
Switching supply current sense input. Connect to the positive side of the current
sense resistor.
DRM
23
Analog
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.
EP (VSS)
EP
Power
Exposed pad. Must be connected to VSS in a star ground configuration. Connect to
a large PCB copper area for power dissipation heat sinking.
REGO
19
Power
System regulator output. Connect to VSYS directly or through an external power-
dissipating resistor.
VCC18
56
Power
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.
VCC33
5
VCCIO
53
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.
VHM
22
Power
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.
VP
21
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.
VSS
7
Power
Ground.
VSSA
6
VSSP
24
VSYS
18
XIN
54
Power
Power
Power
Analog
Analog ground. Connect to VSS in a star ground configuration.
Power ground. Connect to VSS in a star ground configuration.
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.
Crystal oscillator driver input. Leave floating if unused.
XOUT
55
Analog
Crystal oscillator driver output. Leave floating if unused.
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Rev 1.0‒February 25, 2014