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TC1219 Datasheet(PDF) 6 Page - Microchip Technology

Part No. TC1219
Description  Switched Capacitor Voltage Converters with Shutdown in SOT Packages
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Maker  MICROCHIP [Microchip Technology]
Homepage  http://www.microchip.com
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TC1219 Datasheet(HTML) 6 Page - Microchip Technology

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TC1219/TC1220
DS21366B-page 6
 2002 Microchip Technology Inc.
4.3
Capacitor Selection
In order to maintain the lowest output resistance and
output ripple voltage, it is recommended that low ESR
capacitors be used. Additionally, larger values of C1
will lower the output resistance and larger values of
C2 will reduce output ripple. (Equation 4-1(b) and
Equation 4-3).
Table 4-1 shows various values of C1 and the
corresponding output resistance values @ +25°C. It
assumes a 0.1
Ω ESRC1 and 2Ω RSWITCH. Table 4-2
shows the output voltage ripple for various values of
C2. The VRIPPLE values assume 10mA output load
current and 0.1
Ω ESRC2.
TABLE 4-1:
OUTPUT RESISTANCE VS.
C1 (ESR = 0.1
Ω)
TABLE 4-2:
OUTPUT VOLTAGE RIPPLE
VS. C2 (ESR = 0.1
Ω)
IOUT 10mA
4.4
Input Supply Bypassing
The VIN input should be capacitively bypassed to
reduce AC impedance and minimize noise effects due
to
the
internal
switching
of
the
device
The
recommended capacitor depends on the configuration
of the TC1219/TC1220.
4.5
Shutdown Input
The TC1219/TC1220 is enabled when SHDN is high,
and disabled when SHDN is low. This input cannot be
allowed to float. (If SHDN is not required, see the
TCM828/829 data sheet.) The SHDN input can be only
driven to 0.5V above VIN to avoid significant current
flows.
4.6
Voltage Inverter
The most common application for charge pump
devices is the inverter (Figure 4-3). This application
uses two external capacitors: C1 and C2 (plus a power
supply bypass capacitor, if necessary). The output is
equal to -VIN plus any voltage drops due to loading.
Refer
to
Table 4-1
and
Table 4-2
for
capacitor
selection.
FIGURE 4-3:
VOLTAGE INVERTER
TEST CIRCUIT
C1 (
µF)
TC1219
ROUT(Ω)
TC1220
ROUT(Ω)
1
100
45
3.3
42
25
10
25
19.4
30
19.3
17.5
C2 (
µF)
TC1219
VRIPPLE (mV)
TC1220
VRIPPLE (mV)
1419
145
3.3
128
45
10
44
16
30
16
7
3
2
4
5
1
C3
C1
C2
VIN
VOUT
RL
TC1219
TC1220
C1–
IN
OUT
C1+
GND
Device
C1
C2
C3
TC1219
10
µF
10
µF
10
µF
TC1220
3.3
µF
3.3
µF
3.3
µF
SHDN
6
+
+
+


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