7.4 Power Supply Recommendations

The AMC0106M25 does not require any specific power-up sequencing. The high-side power supply (AVDD) is

decoupled with a low-ESR, 100nF capacitor (C1) parallel to a low-ESR, 1μF capacitor (C2). The low-side power

supply (DVDD) is equally decoupled with a low-ESR, 100nF capacitor (C3) parallel to a low-ESR, 1μF capacitor

(C4). Place all four capacitors (C1, C2, C3, and C4) as close to the device as possible. Figure 7-4 shows a

decoupling diagram for the AMC0106M25.

R3 49.9

R2 10

R1 10

C5 10 nF

AVDD

DVDD

from MCU

to MCU

AVDD

AGND

INP

INN

DVDD

CLKIN

DOUT

DGND

C2 1 µF

C1 100 nF

C4 1 µF

C3 100 nF

C6 1 nF

C7 1 nF

I

Figure 7-4. Decoupling of the AMC0106M25

Capacitors have to provide adequate effective capacitance under the applicable DC bias conditions that are

experienced in the application. Multilayer ceramic capacitors (MLCC) typically exhibit only a fraction of the

nominal capacitance under real-world conditions. Take this factor into consideration when selecting these

capacitors. This problem is especially acute in low-profile capacitors, in which the dielectric field strength is

higher than in taller components. Reputable capacitor manufacturers provide capacitance versus DC bias curves

that greatly simplify component selection.

7.5 Layout

7.5.1 Layout Guidelines

The Layout Example section provides a layout recommendation with the critical placement of the decoupling

capacitors (as close as possible to the AMC0106M25 supply pins). This section also depicts the placement of

other components required by the device. For best performance, place the sense resistor close to the device

input pins (INN and INP).

7.5.2 Layout Example

Top Metal

Inner or Bottom Layer Metal

Via

C2

C1

CLKIN (from MCU)

to MCU

DOUT

AGND

DGND

AVDD

INN

INP

DVDD

Clearance area, keep free of

any conductive materials

C4

C3

R3

C6

R1

R2

C7

Figure 7-5. Recommended Layout of the AMC0106M25

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AMC0106M25

SBASAX1A – AUGUST 2024 – REVISED JULY 2025

Copyright © 2025 Texas Instruments Incorporated

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