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| 型号： | TC1301B-UWAVUATR |
| 厂商： | Microchip Technology Inc. |
| 英文描述： | Dual LDO with Microcontroller RESET Function |
| 中文描述： | 双路LDO稳压器与微控制器的复位功能 |
| 文件页数： | 13/28页 |
| 文件大小： | 890K |
| 代理商： | TC1301B-UWAVUATR |
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2005 Microchip Technology Inc.
DS21798B-page 13
TC1301A/B
4.0
TC1301B PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 4-1.
TABLE 4-1:
TC1301B PIN FUNCTION TABLE
4.1
RESET Output Pin
The push-pull output pin is used to monitor the output
voltage (V
OUT1
). If V
OUT1
is less than the threshold volt-
age, the RESET output will be held in the low state. As
V
OUT1
rises above the threshold, the RESET output will
remain in the low state for 300 ms and then change to
the high state, indicating that the voltage on V
OUT1
is
above the threshold.
4.2
Regulated Output Voltage #1
(V
OUT1
)
Connect V
OUT1
to the positive side of the V
OUT1
capacitor and load. It is capable of 300 mA maximum
output current. For the TC1301B, V
OUT1
can be turned
ON and OFF using the SHDN1 input pin.
4.3
Circuit Ground Pin (GND)
Connect GND to the negative side of the input and
output capacitor. Only the LDO internal circuitry bias
current flows out of this pin (200 μA maximum).
4.4
Reference Bypass Input
By connecting an external 10 nF capacitor (typical) to
bypass, both outputs (V
OUT1
and V
OUT2
) will have less
noise and improved Power Supply Ripple Rejection
(PSRR) performance. The LDO output voltage start-up
time will increase with the addition of an external
bypass capacitor. By leaving this pin unconnected, the
start-up time will be minimized.
4.5
Output Voltage #2 Shutdown
(SHDN2)
ON/OFF control is performed by connecting SHDN2 to
its proper level. When this pin is connected to a voltage
less than 15% of V
IN
, V
OUT2
will be OFF. If this pin is
connected to a voltage that is greater than 45% of V
IN
,
V
OUT2
will be turned ON.
4.6
Regulated Output Voltage #2
(V
OUT2
)
Connect V
OUT2
to the positive side of the V
OUT2
capacitor and load. This pin is capable of a maximum
output current of 150 mA. V
OUT2
can be turned ON and
OFF using SHDN2.
4.7
Unregulated Input Voltage Pin
(V
IN
)
Connect the unregulated input voltage source to V
IN
. If
the input voltage source is located more than several
inches away or is a battery, a typical minimum input
capacitance of 1 μF and 4.7 μF is recommended.
4.8
Output Voltage #1 Shutdown
(SHDN1)
ON/OFF control is performed by connecting SHDN1 to
its proper level. When this pin is connected to a voltage
less than 15% of V
IN
, V
OUT1
will be OFF. If this pin is
connected to a voltage that is greater than 45% of V
IN
,
V
OUT1
will be turned ON.
Pin No.
Name
Function
1
RESET
Push-pull output pin that will remain low while V
DET
is below the reset threshold and for
300 ms after V
OUT1
rises above the reset threshold
Regulated output voltage #1 capable of 300 mA
2
V
OUT1
GND
3
Circuit ground pin
4
Bypass
Internal reference bypass pin. A 10 nF external capacitor can be used to further reduce
output noise and improve PSRR performance
5
SHDN2
Output #2 shutdown control Input
6
V
OUT2
V
IN
SHDN1
Regulated output voltage #2 capable of 150 mA
7
Unregulated input voltage pin
8
Output #1 shutdown control input
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