TC1301A datasheet(13/28 Pages) MICROCHIP

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DS21798C-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 (VOUT1). If VOUT1 is less than the threshold

voltage, the RESET output will be held in the low state.

As VOUT1 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 VOUT1 is

above the threshold.

4.2

Regulated Output Voltage #1

(VOUT1)

Connect VOUT1 to the positive side of the VOUT1

capacitor and load. It is capable of 300 mA maximum

output current. For the TC1301B, VOUT1 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 (VOUT1 and VOUT2) 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 VIN, VOUT2 will be OFF. If this pin is

connected to a voltage that is greater than 45% of VIN,

VOUT2 will be turned ON.

4.6

Regulated Output Voltage #2

(VOUT2)

Connect VOUT2 to the positive side of the VOUT2

capacitor and load. This pin is capable of a maximum

output current of 150 mA. VOUT2 can be turned ON and

OFF using SHDN2.

4.7

Unregulated Input Voltage Pin

(VIN)

Connect the unregulated input voltage source to VIN. 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 VIN, VOUT1 will be OFF. If this pin is

connected to a voltage that is greater than 45% of VIN,

VOUT1 will be turned ON.

Pin No.

Name

Function

RESET

Push-pull output pin that will remain low while VDET is below the reset threshold and for

300 ms after VOUT1 rises above the reset threshold

2VOUT1

Regulated output voltage #1 capable of 300 mA

GND

Circuit ground pin

Bypass

Internal reference bypass pin. A 10 nF external capacitor can be used to further reduce

output noise and improve PSRR performance

SHDN2

Output #2 shutdown control Input

6VOUT2

Regulated output voltage #2 capable of 150 mA

7VIN

Unregulated input voltage pin

SHDN1

Output #1 shutdown control input

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