Dedicated Memory Stick/Memory Stick-Pro Card Socket; Figure 11. Sd/Mmc Power Switch Implementation; Figure 12. Sd/Mmc Fet Power Switch Implementation - Texas Instruments PCI7620 Implementation Manual

SCPU019
7.1.2.2 Secure Digital/Multimedia Card Power Switch
System designers can power the SD/MMC socket connector by using either a power switch
(TPS2030 or equivalent) or a FET power switch implementation.
If a power switch is chosen, then a 0.1-µF bypass capacitor connected between SD/MMC V
and GND is recommended.
If the FET implementation is chosen, then a single inverter gate (SN74AUC1GU04 or
equivalent) is recommended in combination with a P-channel transistor (BSO 203SP or
equivalent).
MC_PWR_CTRL_0

Figure 12. SD/MMC FET Power Switch Implementation

7.1.3 Dedicated Memory Stick/Memory Stick-Pro Card Socket

In order to take advantage of the dedicated MS/MSPRO socket, a MS/MSPRO flash media
socket connector and a 3.3-V power switch are recommended.
24 PCI7620/PCI7420/PCI6620/PCI6420 Implementation Guide
MC_PWR_CTRL_1

Figure 11. SD/MMC Power Switch Implementation

U1-1
1
2
3
SN74AUC1GU04
Single Input Inverter Gate
EVM3.3V
U1
1
GND OUT
2
IN OUT
3
IN OUT
4
EN
OC
TPS2030
EVM3.3V
5
4
VCC_SD/MMC
8
7
6
5
C45
.1uF
VCC_SD/MMC
Q1
1 8
S D
2 7
S D
3 6
S D
4 5
G D
P-Channel Transistor R1
CC
100K