TC1301A-ADAVUATR datasheet(12/28 Pages) MICROCHIP

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TC1301A/B

DS21798C-page 12

3.0

TC1301A PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 3-1.

TABLE 3-1:

TC1301A PIN FUNCTION TABLE

3.1

RESET Output Pin

The push-pull output pin is used to monitor the voltage

on the VDET pin. If the VDET voltage is less than the

threshold voltage, the RESET output will be held in the

low state. As the VDET pin 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 the VDET pin is above the threshold.

3.2

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. VOUT1 output is available when VIN is

available; there is no pin to turn it OFF. See TC1301B

if ON/OFF control of VOUT1 is desired.

3.3

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).

3.4

Reference Bypass Input

By connecting an external 10 nF capacitor (typical) to

the bypass input, 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.

3.5

Output Voltage #2 Shutdown

(SHDN2)

ON/OFF control is performed by connecting SHDN2 to

its proper level. When the input of 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.

3.6

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.

3.7

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 input capacitance

of 1 µF to 4.7 µF is recommended.

3.8

Input Pin for Voltage Detector

(VDET)

The voltage on the input of VDET is compared with the

preset VDET threshold voltage. If the voltage is below

the threshold, the RESET output will be low. If the

voltage is above the VDET threshold, the RESET output

will be high after the RESET time period. The IDET

supply current is typically 9 µA at room temperature,

with VDET =3.8V.

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 VDET 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.

8VDET

Input pin for Voltage Detector (VDET).

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