Datasheet

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   
   
SLVS216B − JUNE 1999 − JUNE 2008
17
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
applications proposals
TPS60111 with LC output filter for ultra low ripple
For applications where extremely low output ripple is required, a small LC filter is recommended. This is shown
in Figure 30. The addition of a small inductor and filter capacitor will reduce the output ripple well below what
could be achieved with capacitors alone. The corner frequency of 500 kHz was chosen above the 300 kHz
switching frequency to avoid loop stability issues in case the feedback is taken from the output of the LC filter.
Leaving the feedback (FB) connection point before the LC filter, the filter capacitance value can be increased
to achieve even higher ripple attenuation without affecting stability margin.
IN
IN
C1+
C1−
ENABLE
OUT
OUT
FB
C2+
C2−
SYNC
SKIP COM CLK
PGND GND
INPUT
2.7 V to 5.4 V
C
IN
4.7 µF
OUTPUT
5 V 150 mA
C
O
= 33 µF
C
2F
1 µF
C
1F
1 µF
+
OFF/ON
TPS60111
+ 1 µF
+
0.1 µH
Figure 30. TPS60111 With LC Filter for Ultra Low Output Ripple Applications
related information
application reports
For more application information see:
D PowerPAD Application Report (Literature Number: SLMA002)
D TPS6010x/TPS6011x Charge Pump Application Report (Literature Number: SLVA070)
device family products
Other devices in this family are:
PART NUMBER
LITERATURE
NUMBER
DESCRIPTION
TPS60100 SLVS213 Regulated 3.3-V, 200-mA Low-Noise Charge Pump DC/DC Converter
TPS60101 SLVS214 Regulated 3.3-V, 100-mA Low-Noise Charge Pump DC/DC Converter
TPS60110 SLVS215 Regulated 5-V, 300-mA Low-Noise Charge Pump DC/DC Converter