VOUT

V+

NC

GND

GND

NC

13

TMP20

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SBOS466B – DECEMBER 2009 – REVISED DECEMBER 2018

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9 Power Supply Recommendations

The low supply current and supply range of 1.8 V to 5.5 V enable the TMP20 to be powered from multiple supply

sources.

Power supply bypassing is optional and is typically dependent on the noise of the power supply. In noisy

systems, adding bypass capacitors may be necessary to decrease the noise that couples to the output of the

TMP20.

10 Layout

10.1 Layout Guidelines

The substrate on the TMP20AIDCK package is directly connected through conductive epoxy to the flag that

connects pin 2 on the lead frame. Consequently, pin 2 is the best lead for a conductive thermal connection to the

TMP20 die. The optimal electrical connection for this pin is ground (GND).

CAUTION

Do not attempt to connect pin 2 (DCK package) to any electrical potential other than

ground.

If it is not possible to connect pin 2 to ground, it is possible to electrically isolate this pin (that is, leave it floating).

Take care when electrically isolating this pin because any noise or electromagnetic interference or radio

frequency interference (EMI or RFI) spikes that couple in through this pin can cause erroneous temperature

results.

shows a proper layout of the TMP20 with correct electrical and thermal connections to pin 2.

10.2 Layout Example

Figure 14 shows a layout of the TMP20 with proper electrical and thermal connections to pin 2.

Figure 14. TMP20 Layout With Proper Electrical and Thermal Connections