NXP Semiconductors
PF4210
14-channel power management integrated circuit (PMIC) for audio/video applications
12.5 Switching regulator layout recommendations
• Per design, the switching regulators in PF4210 are designed to operate with only one
input bulk capacitor. However, it is recommended to add a high-frequency filter input
capacitor (CIN_HF), to filter out any noise at the regulator input. This capacitor should be
in the range of 100 nF and should be placed right next to or under the IC, close to the
IC pins.
• Make high-current ripple traces low-inductance (short, high W/L ratio).
• Make high-current traces wide or copper islands.
• Make high-current traces symmetrical for dualphase regulators (SW1, SW3).
VIN
SWxIN
C
IN_HF
C
IN
SWxLX
SWxFB
DRIVER
CONTROLLER
L
C
OUT
COMPENSATION
aaa-023892
Figure 34.ꢀGeneric buck regulator architecture
Route FB trace on any layer away from noisy nodes
VIN
GND
C
OUT
C
IN
VOUT
SWxFB
SWxIN
SWxLX
C
IN_HF
Inductor
aaa-023893
Figure 35.ꢀLayout example for buck regulators
PF4210
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Data sheet: technical data
Rev. 2.0 — 14 November 2018
129 / 137
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