TC1267

DS21378B-page 4

© 2002 Microchip Technology Inc.

2.0

PIN DESCRIPTIONS

Thedescriptionsof the pins arelistedinTable2-1.

TABLE 2-1:

PIN FUNCTION TABLE

3.0

DETAILED DESCRIPTION

FIGURE 3-1:

APPLICATION CIRCUIT

Pin No.

Symbol

Description

Auxiliary input supply, nominally 3.3V.

Main input supply for the TC1267, nominally 5V.

3

GND

Logic and power ground.

LDO 3.3V output.

Driver output for external P-channel MOSFET pass element.

5V

3.3V

TAB IS GND

Q1

C3

0.1

µF

C1

4.7

µF

C2

0.1

µF

C4

4.7

µF

3.3V

TC1267

C5

0.1

µF

NOTE: External switch (Q1): use Motorola MGSF1P02ELT1 or equivalent

Ω at VGS = 2.5V)