ryanf / USB type-C PD DFP [ALT_1_ML1&2PP] [Net Pri Set]

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Power Distribution Network Analysis

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Here’s a concise classification of the four PDN-droop levels, each defined by its local L–C interface:

Table

Droop LevelLocationL–C InterfaceKey Characteristics
Zeroth (On-Die)Within the siliconOn-die interconnect inductance & embedded capacitance• Decoupling caps embedded in the die (< nH L, < nF C)
• Fastest transient response (ps–ns)
First (Chip-Package)Chip package pins and ballsBond-wire or paddle inductance (~1–5 nH) + package decoupling (1–10 µF)• Handles die-to-package switching currents
• Response in ns–tens of ns
Second (Package-Board)PCB land pattern & package footprintLead-frame or ball inductance (5–20 nH) + board-side decoupling (10–100 µF)• Bridges package to board planes
• Response in tens–ns to hundreds-ns
Third (Board-VRM)VRM output to PCB planesBulk inductance of VRM-to-plane path (10–100 nH) + bulk capacitance (100–1000 µF)• Governs slowest transients (µs–ms)
• Sets overall voltage droop under load steps
  • Each level “droops” (voltage sags) under fast load steps until the next-closest L–C stage can respond.
  • Proper PDN design ensures enough capacitance at each level so that the switching current is first met by the fastest (lowest-L) stage, then handed off progressively to bulk stages.
  • Tuning L–C values at each interface (e.g., package caps, board ceramic arrays, bulk electrolytics) controls both the magnitude of droop and the transient-recovery time at that hierarchy level.
Package decap selection
Board decap selection
Bulk cap options
PDN impedance analysis
Simulate droop response
284 days
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U4
DSG_CSN
DSG_VOSN
DSG_SW1
DSG_FB
DSG_VOSN
DSG_FB
DSG_HDV2
DSG_HDV1
DSG_Vo
DSG_CSP
GND_DSG
C36
Capacitance
220pF
DSG_Vo
C37
Capacitance
0.033uF
DSG_VCC
C40
Capacitance
0.047uF
PACK+
C35
Capacitance
0.1uF
C34
Capacitance
0.22uF
C45
Capacitance
0.22uF
VI_COB
GND_DSG
C38
Capacitance
39pF
C33
Capacitance
1uF
GND_DSG
C44
Capacitance
100pF
C43
Capacitance
100pF
C39
Capacitance
100pF
PACK+
D10
R42
Resistance
1.5kΩ
R34
Resistance
1.5kΩ
D4
R41
Resistance
1.5kΩ
R35
Resistance
10 Ω
R40
Resistance
1.5kΩ
R36
Resistance
100kΩ
Q10

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USB type-C PD DFP [ALT_1_ML1&2PP] [Net Pri Set]

USB type-C PD DFP [ALT_1_ML1&2PP] [Net Pri Set] thumbnail
USB Type-C PD Downstream-Facing Port design featuring TPS25740 PD controller, LM5175 buck converter, integrated protections and precision monitoring..

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