TPS38 datasheet(32/53 Pages) TI

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11 Layout

11.1 Layout Guidelines

• Make sure that the connection to the VDD pin is low impedance. Good analog design practice is to place a

greater than 0.1 µF ceramic capacitor as near as possible to the VDD pin.

• To further improve the noise immunity on the SENSEx pins, placing a 1 nF to 10 nF capacitor between the

SENSEx pins and GND can reduce the sensitivity to transient voltages on the monitored signal.

• If a capacitor is used on CTS1, CTS2, CTR1, or CTR2, place these components as close as possible to the

respective pins. If the capacitor adjustable pins are left unconnected, make sure to minimize the amount of

parasitic capacitance on the pins to less than 5 pF.

• For open-drain variants, place the pull-up resistors on RESET1 and RESET2 pins as close to the pins as

possible.

• When laying out metal traces, separate high voltage traces from low voltage traces as much as possible. If

high and low voltage traces need to run close by, spacing between traces should be greater than 20 mils

(0.5 mm).

• Do not have high voltage metal pads or traces closer than 20 mils (0.5 mm) to the low voltage metal pads or

traces.

11.2 Layout Example

The DSK layout example in Figure 11-1 shows how the TPS38-Q1 is laid out on a printed circuit board (PCB)

with user-defined delays.

Monitored Voltage

Overvoltage Flag

CVDD

GND

RPU2

VDD

RPU1

Undervoltage Flag

TPS38-Q1

Monitored Voltage

PULL-UP

GND

Vias used to connect pins for application-specific connections

CSENSE1

CSENSE2

DSK Package

Figure 11-1. TPS38-Q1 DSK Package Recommended Layout

TPS38-Q1

SNVSBI8C – AUGUST 2020 – REVISED DECEMBER 2021

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TPS38 Datasheet(PDF) 32 Page - Texas Instruments