TC1267_13 Datasheet, PDF (4/14 Pages) Microchip Technology – 400mA PCI LDO

TC1267
2.0 PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
Pin No.
1
2
3
4
5
PIN FUNCTION TABLE
Symbol
V_AUX
V_IN
GND
V_OUT
D_R
Description
Auxiliary input supply, nominally 3.3V.
Main input supply for the TC1267, nominally 5V.
Logic and power ground.
LDO 3.3V output.
Driver output for external P-channel MOSFET pass element.
3.0 DETAILED DESCRIPTION
FIGURE 3-1:
APPLICATION CIRCUIT
Q1
TAB IS GND
TC1267
5V
C1
4.7μF
3.3V
C2
0.1μF
C3
0.1μF
C4
4.7μF
3.3V
C5
0.1μF
NOTE: External switch (Q1): use Motorola MGSF1P02ELT1 or equivalent
(PMOS, typical Gate Threshold Voltage = 1V, typical RDS(ON) = 0.4Ω at VGS = 2.5V)
DS21378C-page 4
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