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| 型号： | TPS60101PWPRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 0.1 A SWITCHED CAPACITOR REGULATOR, 400 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封装： | GREEN, PLASTIC, HTSSOP-20 |
| 文件页数： | 8/26页 |
| 文件大小： | 840K |
| 代理商： | TPS60101PWPRG4 |
TPS60101
REGULATED 3.3V 100mA LOW NOISE
CHARGE PUMP DC/DC CONVERTER
SLVS214A JUNE 1999 REVISED SEPTEMBER 1999
16
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
capacitor selection
The TPS60101 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) will be 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 5-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)
VIN
[V]
IO [mA]
CIN
[
F]
CxF
[
F]
CO
[
F]
OUTPUT
VOLTAGE
RIPPLE VPP
IN
[V]
IO [mA]
TANTALUM
CERAMIC
xF
[
F]
TANTALUM
CERAMIC
RIPPLE VPP
[mV]
2.4
50
4.7
1
10
135
2.4
50
4.7 (X7R)
1
10 (X5R)
125
2.4
100
4.7
1
10
70
2.4
100
4.7 (X7R)
1
10 (X5R)
65
All measurements are done with additional 1-F X7R ceramic capacitors at input and output.
Table 4. Recommended Capacitor Values for Low Output Voltage Ripple Operation
(constant-frequency mode)
VIN
[V]
IO
[mA]
CIN
[
F]
CxF
[
F]
CO
[
F]
OUTPUT
VOLTAGE
RIPPLE VPP
IN
[V]
O
[mA]
TANTALUM
CERAMIC
xF
[
F]
TANTALUM
CERAMIC
RIPPLE VPP
[mV]
2.4
50
4.7
1
22
5
2.4
50
4.7 (X7R)
1
22 (X5R)
3
2.4
100
4.7
1
22
10
2.4
100
4.7 (X7R)
1
22 (X5R)
5
All measurements are done with additional 1-F X7R ceramic capacitors at input and output.
In constant-frequency mode always select CO ≥ 22 F
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