SMH4042A Datasheet, PDF (18/28 Pages) Summit Microelectronics, Inc. – Distributed Power Hot-Swap Controller for CompactPCI

SMH4042A
POWER SWITCHING OPTIONS
The figures below illustrate four possible methods for
wiring the SMH4042A. In the upper left example both power
FETs are connected to a single VGATE output. This
should be used when the design requires the backend
voltages to be powered-up simultaneously. In the upper
right example both VGATE outputs are being used so that
the 3.3V slew lags the 5V slew. The two bottom circuits
illustrate the wiring for single power supply boards. Note
how the VSEL pin is biased differently for the two
applications.
5V ±5%
5A max
3.3V ±0.3V
7.6A max
10Ω
10Ω
47nF
0.0065Ω
VCC
CBI_5
VGATE5
CARD_5V_MON
VSEL
CARD_3V_MON
VGATE3
CBI_3
HST_3V_MON
5V ±5%
5A max
3.3V ±0.3V
7.6A max
10Ω
47nF
10Ω
47nF
0.0065Ω
VCC
CBI_5
VGATE5
CARD_5V_MON
VSEL
CARD_3V_MON
VGATE3
CBI_3
HST_3V_MON
Dual Voltage, Single Slew Rate Implementation
Dual Voltage, Dual Slew Rate Implementation
5V ±5%
5A max
10Ω
47nF
VCC
CBI_5
VGATE5
CARD_5V_MON
VSEL
CARD_3V_MON
VGATE3
CBI_3
HST_3V_MON
3.3V ±0.3V
7.6A max
0.0065Ω
10Ω
47nF
VCC
CBI_5
VGATE5
CARD_5V_MON
VSEL
CARD_3V_MON
VGATE3
CBI_3
HST_3V_MON
Single 5V Implementation
Single 3.3V Implementation
Figure 14. Four Power Switching Implementations
18
2070 9.1 5/27/03
SUMMIT MICROELECTRONICS, Inc.