© 2005 Microchip Technology Inc.

DS21333B-page 11

TC1302A/B

4.0

TC1302B PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 4-1.

TABLE 4-1:

TC1302B PIN FUNCTION TABLE

4.1

Regulated Output Voltage #1

capacitor and load. Capable of 300 mA maximum

ON and OFF using the SHDN1 input pin.

4.2

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).

4.3

Reference Bypass Input

By connecting an external 10 nF capacitor (typical) to

have less noise and improved Power Supply Ripple

Rejection (PSRR) performance. The LDO output

voltage startup time will increase with the addition of an

external

bypass

capacitor.

By

leaving

this

pin

unconnected, the startup time will be minimized.

4.4

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

4.5

Regulated Output Voltage #2

capacitor and load. This pin is capable of a maximum

OFF using SHDN2.

4.6

Unregulated Input Voltage Pin

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.

4.7

Output Voltage #1 Shutdown

(SHDN1)

ON/OFF control is performed by connecting SNDN1 to

its proper level. When this pin is connected to a voltage

Pin No.

Name

Function

1

NC

No connect.

Regulated output voltage #1, capable of 300 mA.

3

GND

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.

Regulated output voltage #2, capable of 150 mA.

Unregulated Input voltage pin.

8

SHDN1

Output #1 shutdown control input.