VIN
1
2
3
4
FB
EN
5
TPS61040
SW
GND
VIN
VOUT
GND
19
TPS61040, TPS61041
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SLVS413I – OCTOBER 2002 – REVISED DECEMBER 2016
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TPS61040 TPS61041
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Copyright © 2002–2016, Texas Instruments Incorporated
9 Power Supply Recommendations
The device is designed to operate from an input voltage supply range between 1.8 V and 6 V. The output current
of the input power supply must be rated according to the supply voltage, output voltage and output current of
TPS6104x.
10 Layout
10.1 Layout Guidelines
Typical for all switching power supplies, the layout is an important step in the design; especially at high peak
currents and switching frequencies. If the layout is not carefully done, the regulator might show noise problems
and duty cycle jitter.
The input capacitor should be placed as close as possible to the input pin for good input voltage filtering. The
inductor and diode should be placed as close as possible to the switch pin to minimize the noise coupling into
other circuits. Because the feedback pin and network is a high-impedance circuit, the feedback network should
be routed away from the inductor. The feedback pin and feedback network should be shielded with a ground
plane or trace to minimize noise coupling into this circuit.
Wide traces should be used for connections in bold as shown in
Figure 23
. A star ground connection or ground
plane minimizes ground shifts and noise.
10.2 Layout Example
Figure 23. Layout Diagram