SMH4803
PIN CONFIGURATIONS
Symbol
Drain Sense
Vgate
Pin
1
Description
Drain sense input
2
Output to MOSFET gate
Enable/Temp Sense input
Pin Detect 1 (active LO)
Pin Detect 2 (active LO)
Circuit Breaker Fault output
Circuit Breaker Reset intput
Circuit Breaker Mode control
Cicruit Breaker Sense input
Negative Supply Connection
Under Voltage input
Drain Sense
Vgate
Vdd
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
EN/TS
PD1#
3
PG2#
PG1#
PG3#
ENPGA
ENPGB
2.5V
4
PD2#
5
EN/TS
CBFault#
CBReset#
CBMode
CBSense
Vss
6
PD1#
7
PD2#
8
9
CBFault#
CBReset#
CBMode
CBSense
Vss
10
11
12
13
14
15
16
17
18
19
20
UV
5V
OV
Over Voltage input
OV
5V
5V reference output
2.5V
2.5V reference output
Enable input B
UV
ENPGB
ENPGA
PG3#
2041 ILL10.1
Enable input A
Power good output 3
Power good output 1
Power good output 2
PG1#
PG2#
Vdd
Positive supply connection
2041 PGM T2.1
RECOMMENDED OPERATING CONDITIONS
Condition
Min
Max
Temperature
-40°C
+85°C
2041 PGM T3.0
DESCRIPTION
maybeusedtoturnONtheloads,e.g.isolated-outputDC-
DC converters, or drive LED status lights. The SMH4803
provides three separate “Power Good” logic outputs that
activate loads in a timed sequence. Additional features of
the SMH4803 include: temperature sense or master en-
able input, 2.5V and 5V reference outputs for expanding
monitor functions, two “Pin-Detect” enable inputs for fault
protection, and duty-cycle or latched over-current protec-
tion modes.
The SMH4803 is designed to control hot swapping of
plug-in cards operating from a single supply ranging from
20V to 500V. The SMH4803 hot-swap controller provides
under-voltage and over-voltage monitoring of the host
powersupply,itdrivesanexternalpowerMOSFETswitch
that connects the supply to the load, and also protects
againstover-currentconditionsthatmightdisruptthehost
supply. When the input and output voltages to the
SMH4803 controller are within specification, the
SMH4803providesthree“PowerGood”logicoutputsthat
2041 8.4 6/15/00
SUMMIT MICROELECTRONICS
2
SUMMIT [ SUMMIT MICROELECTRONICS, INC. ]
