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Role of Capacitor [4]
Copyright. SAMSUNG ELECTRO-MECHANICS All rights reserved. SAMSUNG Role of Capacitor [1] Overview of Capacitor Role [2] Noise Filtering caused by IC Switching [3] Noise Filtering caused by Converter Switching [4] Power Delivery Network SAMSUNG Power Delivery Network (1), Overview Impedance Modeling of Power Rails [Power Delivery Network] ※ Power Design Consideration - DC: Minimize Resistance (Rdc) of Power/Ground rails between VR and IC - AC: Minimize Impedance (Z) of the entire Power Delivery Network in order to reduce the ripple voltage. SAMSUNG Power Delivery Network (2) DC Analysis - IR (Voltage) drop analysis for power rails [Top layer] MSM8996 Pin [Bottom layer] PMIC to de-Cap [Layer 5] Power plane [Bottom layer] GND Net SAMSUNG Power Delivery Network (3) AC Analysis - Impedance of PDN can be reduced below the target impedance by using capacitors Target Impedance Z= ΔV/I ΔV: Allowable Ripple, I: Current A decrease of Impedance with capacitors SAMSUNG Power Delivery Network (4), Real Example AC Analysis: Smartphone AP* SAMSUNG Power Delivery Network (5), Trend Trend of PDN in a Smartphone - The improvement of AP performance increases the amount of 3T cap. and low profile capacitors Category - Function / Capacitor (1) - Regulating / Capacitor (2) - Decoupling / Capacitor (3) - High Freq. Decoupling Category - Why Parallel MLCC / Capacitor (1) - Capacitance ↑ / Capacitor (2) - Inductance ↓ / Capacitor (3) - Inductance ↓ SAMSUNG Power Delivery Network (6), Case 3 Each function range of Capacitors in PDN PMIC - Impedance ↓ Freq. range, MLCC - Tens of kHz~ Hundreads of kHz, 3T - Hundreads of kHz~ Tens of MHz, LSC - Tens of MHz ↑ MLCC - Hundreads of kHz, 3 Terminal - Hundreads of kHz~Tens of MHZ, LSC - Tens of MHZ Copyright. SAMSUNG ELECTRO-MECHANICS All rights reserved.