Datasheet

VTT

VTTSNS

PGND

TPS51206

10 mF

VTT

UDG-11137

TPS51206

SLUSAH1A –MAY 2011–REVISED OCTOBER 2013

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APPLICATION INFORMATION

VDD CAPACITOR

Add a ceramic capacitor, with a value 0.1 µF (or greater) and X5R grade (or better), placed close to the VDD

terminal, to stabilize the bias supply voltage from any parasitic impedance from the power supply rail.

VLDOIN CAPACITOR

Depending on the trace impedance between the VLDOIN bulk power supply to the device, a transient increase of

source current is supplied mostly by the charge from the VLDOIN input capacitor. Use a 10-µF (or greater) and

X5R grade (or better) ceramic capacitor to supply this transient charge.

VTTREF CAPACITOR

Add a ceramic capacitor, with a value 0.22 µF and X5R grade (or better), placed close to the VTTREF terminal

for stable operation.

VTT CAPACITOR

For stable operation, a 10-µF (or greater) and X5R (or better) grade ceramic capacitor(s) need to be attached

close to the VTT terminal. This capacitor is recommended to minimize any additional equivalent series resistance

(ESR) and/or equivalent series inductance (ESL) of ground trace between the PGND terminal and the VTT

capacitor(s).

VTTSNS CONNECTION

To achieve tight regulation with minimum effect of trace resistance, a remote sensing terminal, the VTTSNS pin

should be connected to the positive terminal of the VTT pin output capacitor(s) as a separate trace from the high-

current path from VTT. Consider adding a low-pass R-C filter at the VTTSNS pin in case the ESR of the VTT

output capacitor(s) is larger than 2 mΩ. The R-C filter time constant should be approximately the same or slightly

lower than the time constant of the VTT output capacitance and ESR.

Figure 24. R-C Filter for VTTSNS

VDDQSNS CONNECTION

VDDQSNS is a reference input of the VTTREF and VTT. Trace should be routed away from noise-generating

lines.

Product Folder Links: TPS51206