SUMMIT MICROELECTRONICS, Inc. 2000 300 Orchard City Drive, Suite 131 Campbell, CA 95008 Telephone 408-378-6461 Fax 408-378-6586 www.summitmicro.com
1
Characteristics subject to change without notice
2041 8.4 6/15/00
SMH4803
FEATURES
Supply Range 20VDC to >500VDC
Versatile Card Insertion Detection Supports
Both
Multi-length Pin Systems
Card Injector Switch Sensing
Control Up to Four Loads or a Primary Load and
3 DC/DC Converters
Highly
Programmable Host Voltage Monitoring
Programmable Under- and Over-voltage
Detection
Programmable Power Good Delays for
Sequencing DC/DC Converters
Distributed Power Hot-Swap Controller
Programmable Circuit Breaker Function
Programmable Over-current Filter
Programmable Quick-TripTM Circuit Breaker
Values
Programmable Circuit Breaker Mode
Duty-Cycle Mode
Latched Mode
2.5V and 5.0V reference outputs
Easy Expansion of External
Monitor Functions
FUNCTIONAL BLOCK DIAGRAM
ASSOCIATE
MEMBER
P
ro
gra mma
ble
Qui
ck-Trip
TM
C ircu
it B
rea
ker
Featuring
+
-
+
-
+
-
12V
5V
2.5V
Programmable
Delay
Programmable
Delay
+
-
+
-
CBFault#
2041 BD 8.0
Vgate
2.5V ref
5.0V ref
PG1#
PG2#
ENPGB
ENPGA
PG3#
CBSense
Programmable
Delay
VSS
CBMode
CBReset#
EN/TS
PD1#
PD2#
UV
OV
Drain
Sense
VDD
Fault
Latch
&
Duty
Cycle
Timer
+
-
50
mV
Programmable
Quick-Trip
Ref Voltage
Filter
12V ref
12V
current limit
Vgate
Sense
50k
50k
50k
2
SMH4803
2041 8.4 6/15/00
SUMMIT MICROELECTRONICS
Symbol
Pin
Description
Drain Sense
1
Drain sense input
Vgate
2
Output to MOSFET gate
EN/TS
3
Enable/Temp Sense input
PD1#
4
Pin Detect 1 (active LO)
PD2#
5
Pin Detect 2 (active LO)
CBFault#
6
Circuit Breaker Fault output
CBReset#
7
Circuit Breaker Reset intput
CBMode
8
Circuit Breaker Mode control
CBSense
9
Cicruit Breaker Sense input
Vss
10
Negative Supply Connection
UV
11
Under Voltage input
OV
12
Over Voltage input
5V
13
5V reference output
2.5V
14
2.5V reference output
ENPGB
15
Enable input B
ENPGA
16
Enable input A
PG3#
17
Power good output 3
PG1#
18
Power good output 1
PG2#
19
Power good output 2
Vdd
20
Positive supply connection
2041 PGM T2.1
PIN CONFIGURATIONS
RECOMMENDED OPERATING CONDITIONS
Condition
Min
Max
Temperature
-40C
+85C
2041 PGM T3.0
1
2
3
4
5
6
7
8
9
10
16
15
14
13
12
11
19
20
17
18
2041 ILL10.1
Drain Sense
Vgate
EN/TS
PD1#
PD2#
CBFault#
CBReset#
CBMode
CBSense
Vss
Vdd
PG2#
PG1#
PG3#
ENPGA
ENPGB
2.5V
5V
OV
UV
DESCRIPTION
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
power supply, it drives an external power MOSFET switch
that connects the supply to the load, and also protects
against over-current conditions that might disrupt the host
supply. When the input and output voltages to the
SMH4803 controller are within specification, the
SMH4803 provides three "Power Good" logic outputs that
may be used to turn ON the loads, e.g. isolated-output DC-
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.
3
2041 8.4 6/15/00
SMH4803
SUMMIT MICROELECTRONICS
*COMMENT
Stresses listed under Absolute Maximum Ratings
may cause permanent damage to the device. These
are stress ratings only, and functional operation of
the device at these or any other conditions outside
those listed in the operational sections of this speci-
fication is not implied. Exposure to any absolute
maximum rating for extended periods may affect
device performance and reliability.
ABSOLUTE MAXIMUM RATINGS
Temperature Under Bias
-55C to +125C
Storage Temperature
-65C to +150C
Voltage on pins with respect to V
SS
Vdd
-0.5V to Vdd
UV, OV, CBSense, Drain Sense
-0.5V to Vdd +0.5V
PD1#, PD2#, CBMode, CBReset#
10V
ENPGA, ENPGB, EN/TS
CBFault#, PG1#, PG2#, PG3#
-0.5V to Vdd +0.5V
Vgate
Vdd + 0.5V
Lead Solder Temperature (10 secs)
300 C
Symbol
Parameter
Notes
Min.
Typ.
Max.
Units
V
DD
Supply Voltage
I
DD
= 2mA
11
12
13
V
Vref5
5Volt Reference Output
I
DD
= 2mA
4.75
5
5.25
V
I
LOAD5
5Volt Reference Output Current
I
DD
= 2mA
-1
1
mA
Vref2.5
2.5 Volt Reference Output
T
A
= 25 C, I
DD
= 2mA
2.475
2.5
2.525
V
Vref2.5
2.5 Volt Reference Output
I
DD
= 2mA
2.425
2.5
2.575
V
I
LOAD2.5
2.5 Volt Reference Output Current
I
DD
= 2mA
-0.2
1
mA
I
DD
Power Supply Current
Output Enabled
2
10
mA
V
UV
Under voltage Threshold
T
A
= 25 C, I
DD
= 2mA
2.475
2.5
2.525
V
V
UV
Under voltage Threshold
I
DD
= 2mA
2.425
2.5
2.575
V
V
UVHYS
Under voltage Hysteresis
I
DD
= 2mA
10
mV
V
OV
Over voltage Threshold
T
A
= 25 C, I
DD
= 2mA
2.475
2.5
2.525
V
V
OV
Over voltage Threshold
I
DD
= 2mA
2.425
2.5
2.575
V
V
OVHYS
Over voltage Hysteresis
I
DD
= 2mA
10
mV
V
VGATE
Vgate Output Voltage
V
DD
V
I
VGATE
Vgate Current Output
100
A
V
SENSE
Drain Sense threshold
T
A
= 25 C, I
DD
= 2mA
2.475
2.5
2.525
V
V
SENSE
Drain Sense threshold
I
DD
= 2mA
2.425
2.5
2.575
V
I
SENSE
Drain Sense Output Current
(Note 1) V
SENSE
= V
SS
9
10
11
A
V
CB
Circuit Breaker Threshold
I
DD
= 2mA
40
50
60
mV
V
QCB
Quick-Trip Circuit Breaker Threshold
Option E
200
mV
Option F
100
mV
Option H
50
mV
Option J
OFF
V
ENTS
EN/TS Threshold
T
A
= 25 C, I
DD
= 2mA
2.425
2.5
2.575
V
V
ENTS
EN/TS Threshold
I
DD
= 2mA
2.475
2.5
2.525
V
V
ENTSHYS
EN/TS Hysteresis
I
DD
= 2mA
5
10
15
mV
V
IH
Input High Voltage ENPGA/B,
2
Vref5
V
CBMode, CBReset#
V
IL
Input High Voltage ENPGA/B,
-0.1
0.8
V
CBMode, CBReset#
V
OL
CBFault# Output Low Voltage
I
OL
= 2mA
0
0.4
V
V
OL
PG1#, PG2#, PG3# Output Low
I
SINK
= 2mA
0
0.4
V
DC OPERATING CHARACTERISTICS
(Over Recommended Operating Conditions, Voltages are relative to V
SS
)
2041 PGM T4.4
(Note 1) : T
A
= 25 C
4
SMH4803
2041 8.4 6/15/00
SUMMIT MICROELECTRONICS
AC Timing Characteristics, -40
o
C to +85
o
C
Symbol
Description
Min.
Typ.
Max
Unit
t
PDD
Pin Detect Delay to Vgate enable
80
ms
t
CBD
50mv Circuit Breaker Delay (Filter)
K
400
s
L
150
s
M
50
s
N
5
s
P
GD
Power Good Delay (PG1/PG2, PG2/PG3)
A
5
ms
B
20
ms
C
80
ms
D
180
ms
t
FSTSHTDN
Fast Shut Down Delay From Fault to
200
ns
Vgate Off
t
CYC
Circuit Breaker Cycle Mode Cycle Time
2.5
Sec.
t
VGD
Delay from Release of Reset to Vgate on
100
ns
t
CBRST
CBReset# Pulse Width
200
ns
5
2041 8.4 6/15/00
SMH4803
SUMMIT MICROELECTRONICS
11V
13V
2.5V ref
2.5V ref
VDD
UV
OV
PD1#/PD2#
t
PDD
Vgate
2.5V ref
Drain
Sense
50mV ref
CBSense
PG1#
ENPGA
PG2#
ENPGB
PG3#
<t
CBD
PG
D
PG
D
2041 ILL18.0
Figure 1. Power Sequencing Timing Characteristics
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