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参数资料
| 型号： | TC1219ECHRT |
| 元件分类： | 稳压器 |
| 英文描述： | 0.05 A SWITCHED CAPACITOR CONVERTER, 20 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封装： | SOT-23A, 6 PIN |
| 文件页数： | 4/8页 |
| 文件大小： | 85K |
| 代理商： | TC1219ECHRT |
4
TC1219/1220-3 8/20/99
SWITCHED CAPACITOR VOLTAGE
CONVERTERS WITH SHUTDOWN
IN SOT PACKAGES
TC1219
TC1220
Cascading Devices
Two or more TC1219/1220 can be cascaded to in-
crease output voltage (Figure 4). If the output is lightly
loaded, it will be close to (– 2 x VIN) but will droop at least by
ROUT of the first device multiplied by the IQ of the second. It
can be seen that the output resistance rises rapidly for
multiple cascaded devices.
Paralleling Devices
To reduce the value of ROUT, multiple TC1219/1220
can be connected in parallel (Figure 5). The output resis-
tance will be reduced by a factor of N where N is the number
of TC1219/1220. Each device will require its own pump
capacitor (C1), but all devices may share one reservoir
capacitor (C2). However, to preserve ripple performance
the value of C2 should be scaled according to the number
of paralleled TC1219/1220.
Figure 4. Cascading Multiple Devices to Increase Output Voltage
C1
C2
6
4
3
4
1
2
1
3
C2
V
IN
V
OUT
V
OUT = –nVIN
TC1219
TC1220
"1"
TC1219
TC1220
"n"
. . .
SHDN
V
IN
5
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. (See Equation 1(b) and Equation 3).
Table 1 shows various values of C1 and the correspond-
ing output resistance values @ +25
°C. It assumes a 0.1
ESRC1 and 2 RSW. Table 2 shows the output voltage ripple
for various values of C2. The VRIPPLE values assume 10mA
output load current and 0.1
ESRC2.
Table 1. Output Resistance vs. C1 (ESR = 0.1
)
C1(
F)
TC1219
TC1220
ROUT (
)
ROUT (
)
1
100
45
3.3
42
25
10
25
19.4
30
19.3
17.5
Table 2. Output Voltage Ripple vs. C2 (ESR = 0.1
) I
OUT 10mA
C2
TC1219
TC1220
(
F)
VRIPPLE (mV)
1
835
286
3.3
254
88
10
85
31
30
29.8
11.5
Input Supply Bypassing
The VIN input should be capacitively bypassed to reduce
AC impedance and minimize noise effects due to the switch-
ing internal to the device. The recommended capacitor
depends on the configuration of the TC1219/1220.
Shutdown Input
The TC1219/1220 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.
Voltage Inverter
The most common application for charge pump devices
is the inverter (Figure 3). This application uses two exter-
rnal 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 1 and Table
2 for capacitor selection.
Figure 3. Test Circuit
3
2
4
5
1
C3
C1
C2
V
IN
V
OUT
R
L
TC1219
TC1220
C1–
IN
OUT
C1+
GND
Voltage Inverter
Device
C1
C2
C3
TC1219
10
F
10
F
10
F
TC1220
3.3
F
3.3
F
3.3
F
SHDN
6
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| TC1219ECHTR | 功能描述:电荷泵 Switched CAP RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
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