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参数资料
| 型号： | TC1307 |
| 厂商： | Microchip Technology Inc. |
| 英文描述： | Four-Channel CMOS LDO with Select Mode, Shutdown and Independent Reset |
| 中文描述： | 四通道CMOS低压降稳压器的选择模式，关机和独立复位 |
| 文件页数： | 16/28页 |
| 文件大小： | 553K |
| 代理商： | TC1307 |
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TC1307
DS21702A-page 16
2002 Microchip Technology Inc.
5.0
APPLICATIONS
5.1
Load Partitioning
The
TC1307
can be used to power two separate chan-
nels for a wide range of applications. Each channel can
be turned ON and OFF independently of the other. In
this example, the SELECT12 pin is tied to V
IN
and the
SELECT34 pin is tied to GND. The output voltages of
V
OUT1
and V
OUT2
are 3.0V and the output voltage of
V
OUT3
and V
OUT4
are 1.8V. If V
OUT1
and V
OUT3
were
powering 1 Channel and V
OUT2
and V
OUT4
were pow-
ering an identical Channel, either Channel could be
powered independent of the other Channel. The output
voltage of V
OUT1
is being monitored by the internal volt-
age detection circuit. When the output of V
OUT1
is
below the typical 2.63V threshold voltage, the RESET
output will transition low.
5.2
Input Capacitor
Low input source impedance is necessary for the LDO
to operate properly. When operating off of batteries or
in applications with long lead length (>10”) between the
input source and the LDO, some input capacitance is
required. A minimum of 2.2 μF is recommended for
most applications and the capacitor should be placed
as close to the input of the LDO as practical (>0.2”).
Larger input capacitors will help reduce the input
impedance and further reduce any high frequency
noise on the input and output of the LDO. If more than
1 μF of capacitance is used on the LDO outputs, a
4.7 μF input capacitor is recommended.
5.3
Output Capacitor
A minimum output capacitance of 1 μF for the
TC1307
is required for stability. The esr requirements on the
output capacitor are between 0 and 2 ohms. The output
capacitor should be located as close to the LDO output
as practical. Ceramic materials X7R and X5R have low
temperature coefficients and are well within the accept-
able esr range required. A typical 1 μF X5R 0805
capacitor has an esr of 50 milli-ohms. Larger output
capacitors can be used with the
TC1307
to improve
dynamic behavior, noise and ripple rejection perfor-
mance.
5.4
Power Dissipation
The internal power loading within the TC1307 is a func-
tion of input voltage, output voltage, output current, qui-
escent current and RESET output dissipation. For
many applications the power dissipation within the lin-
ear P-Channel device can be used as a good approxi-
mation of total power dissipation. This is due to the low
quiescent current consumed even when the LDO out-
put is providing full load current (150 mA).
FIGURE 5-1:
Typical 4 Output with RESET Application.
TC1307
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
V
DET
SHDN1
SHDN3
SHDN4
SHDN2
SELECT12
SELECT34
V
IN
V
IN
V
IN
RESET
V
OUT1
V
OUT2
V
OUT3
V
OUT4
GND
Battery
Input
1 μF
1 μF
1 μF
1 μF
4.7 μF
Shutdown #2
Shutdown #1
Shutdown #4
Shutdown #3
Controller
MCLR
or
RESET
V
DD
+3.0V
+3.0V
+1.8V
+1.8V
Micro
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