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TPS60110 View Datasheet(PDF) - Texas Instruments

Part NameDescriptionManufacturer
TPS60110 REGULATED 5-V 300-mA LOW-NOISE CHARGE PUMP DC/DC CONVERTER TI
Texas Instruments TI
TPS60110 Datasheet PDF : 26 Pages
First Prev 11 12 13 14 15 16 17 18 19 20 Next Last
TPS60110
REGULATED 5ĆV 300ĆmA LOWĆNOISE
CHARGE PUMP DC/DC CONVERTER
SLVS215C − JUNE 1999 − REVISED AUGUST 2008
APPLICATION INFORMATION
capacitor selection
The TPS60110 requires only four external capacitors as shown in the basic application circuit. Their values are
closely linked to the output current capacity, output noise requirements, and mode of operation. Generally, the
transfer capacitors (CxF) is the smallest.
The input capacitor improves system efficiency by reducing the input impedance and stabilizes the input current.
CIN is recommended to be about two to four times as large as CxF.
The output capacitor (CO) can be selected from 8-times to 50-times larger than CxF, depending on the mode
of operation and ripple tolerance. Tables 3 and 4 show capacitor values recommended for low
quiescent-current operation (pulse-skip mode) and for low output voltage ripple operation (constant-frequency
mode). A recommendation is given for smallest size.
Table 3. Recommended Capacitor Values for Low Quiescent-Current Operation
(pulse-skip mode)
CIN
VIN
[V]
IO [mA]
[µF]
TANTALUM CERAMIC
CxF
[µF]
CO
[µF]
TANTALUM CERAMIC
3.6
225
15
2.2
33
3.6
225
4.7 + 10, (X5R) 2.2
22 + 10, (X5R)
3.6
300
15
2.2
33
3.6
300
4.7 + 10, (X5R) 2.2
22 + 10, (X5R)
All measurements are done with additional 1-µF X7R ceramic capacitors at input and output.
OUTPUT
VOLTAGE
RIPPLE VPP
[mV]
145
55
135
75
Table 4. Recommended Capacitor Values for Low Output Voltage Ripple Operation
(constant-frequency mode)
CIN
CO
VIN
IO
[µF]
CxF
[µF]
[V]
[mA]
[µF]
TANTALUM CERAMIC
TANTALUM CERAMIC
3.6
225
15
2.2
33
3.6
225
4.7 + 10, (X5R) 2.2
22 + 10, (X5R)
3.6
300
15
2.2
33
3.6
300
4.7 + 10, (X5R) 2.2
22 + 10, (X5R)
All measurements are done with additional 1-µF X7R ceramic capacitors at input and output.
OUTPUT
VOLTAGE
RIPPLE VPP
[mV]
17
6
22
8
In constant-frequency mode always select CO 33 µF
14
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