SMH4803
Distributed Power Hot-Swap Controller
•
Programmable Circuit Breaker Function
FEATURES
– Programmable Over-current Filter
– Programmable Quick-Trip™ Circuit Breaker
Values
•
•
Supply Range ±20VDC to >±500VDC
Versatile Card Insertion Detection Supports
Both
– Programmable Circuit Breaker Mode
– Multi-length Pin Systems
– Card Injector Switch Sensing
•
•
•
Duty-Cycle Mode
Latched Mode
•
•
Control Up to Four Loads or a Primary Load and
3 DC/DC Converters
2.5V and 5.0V reference outputs
– Easy Expansion of External
Highly Programmable Host Voltage Monitoring
Monitor Functions
– Programmable Under- and Over-voltage
Detection
•
Programmable Power Good Delays for
Sequencing DC/DC Converters
eaturing
F
c
e
ASSOCIATE
MEMBER
C
FUNCTIONAL BLOCK DIAGRAM
ENPGB
PG3#
VDD
12V ref
-
+
Programmable
Delay
50kΩ
ENPGA
PG2#
EN/TS
50kΩ
50kΩ
PD1#
PD2#
Filter
Programmable
Delay
-
UV
+
PG1#
Drain
-
Sense
12V
+
-
+
OV
2.5V ref
5.0V ref
2.5V
VSS
12V
5V
current limit
Vgate
Sense
CBMode
CBReset#
Vgate
+
-
Programmable
Delay
Fault
CBSense
Latch
&
Duty
Cycle
Timer
50
mV
CBFault#
+
-
Programmable
Quick-Trip
Ref Voltage
2041 BD 8.0
© SUMMIT MICROELECTRONICS, Inc. 2000
2041 8.4 6/15/00
•
300 Orchard City Drive, Suite 131
•
Campbell, CA 95008
•
Telephone 408-378-6461
•
Fax 408-378-6586
• www.summitmicro.com
Characteristics subject to change without notice
1