Distributed Power Hot-Swap Controller FEATURES Supply Range ±20VD

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Distributed Power Hot-Swap Controller FEATURES Supply Range ±20VD

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SMH4803
Distributed Power Hot-Swap Controller
FEATURES Supply Range ±20VDC >±500VDC Versatile Card Insertion Detection Supports Both Multi-length Systems Card Injector Switch Sensing Control Four Loads Primary Load DC/DC Converters Highly Programmable Host Voltage Monitoring Programmable Under- Over-voltage Detection Programmable Power Good Delays Sequencing DC/DC Converters Preliminary
Programmable Circuit Breaker Function Programmable Over-current Filter Programmable Quick-TripCircuit Breaker Values Programmable Circuit Breaker Mode Duty-Cycle Mode
Latched Mode 2.5V 5.0V reference outputs Easy Expansion External Monitor Functions
Quick-Trip eaker ircu
ASSOCIATE MEMBER
FUNCTIONAL BLOCK DIAGRAM
ENPGB PG3#
EN/TS
Programmable Delay
ENPGA
PD1#
Filter
PG2#
Programmable Delay
PD2#
PG1#
Drain Sense
2.5V
2.5V current limit
5.0V
Vgate Sense
CBMode CBReset#
Programmable Quick-Trip Voltage
Vgate
Programmable Delay Fault Latch Duty Cycle Timer
CBSense
SUMMIT MICROELECTRONICS, Inc.
Orchard City Drive, Suite
SUMMIT MICROELECTRONICS, Inc. 1999 2041-07 9/23/99
CBFault#
2041 B1.5
Campbell, 95008
Telephone 408-378-6461
408-378-6586
www.summitmicro.com
Characteristics subject change without notice
SMH4803
Preliminary Symbol Drain Sense Vgate EN/TS PD1# PD2# CBFault# CBReset# CBMode CBSense 2.5V ENPGB ENPGA PG3# PG1# PG2# Description Drain sense input Output MOSFET gate Enable/Temp Sense input Detect (active Detect (active Circuit Breaker Fault output Circuit Breaker Reset intput Circuit Breaker Mode control Cicruit Breaker Sense input Negative Supply Connection Under Voltage input Over Voltage input reference output 2.5V reference output Enable input Enable input Power good output Power good output Power good output Positive supply connection
2041 T2.1
CONFIGURATIONS
Drain Sense Vgate EN/TS PD1# PD2# CBFault# CBReset# CBMode CBSense
PG2# PG1# PG3# ENPGA ENPGB 2.5V
2041 ILL10.1
RECOMMENDED OPERATING CONDITIONS Condition Temperature -40°C +85°C
2041 T3.0
DESCRIPTION SMH4803 designed control swapping plug-in cards operating from single supply ranging from 500V. SMH4803 hot-swap controller provides under-voltage over-voltage monitoring host power supply, drives external power MOSFET switch that connects supply load, also protects against over-current conditions that might disrupt host supply. When input output voltages SMH4803 controller within specification, SMH4803 provides three "Power Good" logic outputs that
used turn loads, e.g. isolated-output DC-DC converters, drive status lights. SMH4803 provides three separate "Power Good" logic outputs that activate loads timed sequence. Additional features SMH4803 include: temperature sense master enable input, 2.5V reference outputs expanding monitor functions, "Pin-Detect" enable inputs fault protection, duty-cycle latched over-current protection modes. companion 8pin device, SMH4801, provides single "Power Good" output offers reduced functionality.
2041-07 9/23/99
SMH4803
Preliminary ABSOLUTE MAXIMUM RATINGS
Temperature Under Bias Storage Temperature Voltage pins with respect CBSense, Drain Sense PD1#, PD2#, CBMode, CBReset# ENPGA, ENPGB, EN/TS CBFault#, PG1#, PG2#, PG3# Vgate Lead Solder Temperature secs) -0.5V -0.5V +0.5V -0.5V +0.5V 0.5V -55°C +125°C -65°C +150°C
*COMMENT Stresses listed under Absolute Maximum Ratings cause permanent damage device. These stress ratings only, functional operation device these other conditions outside those listed operational sections this specification implied. Exposure absolute maximum rating extended periods affect device performance reliability.
OPERATING CHARACTERISTICS (Over Recommended Operating Conditions, Voltages relative VSS) Symbol Vref5 ILOAD5 Vref2.5 Vref2.5 ILOAD2.5 VUVHYS VOVHYS VVGATE IVGATE VSENSE VSENSE ISENSE VQCB Parameter Supply Voltage 5Volt Reference Output 5Volt Reference Output Current Volt Reference Output Volt Reference Output Volt Reference Output Current Power Supply Current Under voltage Threshold Under voltage Threshold Under voltage Hysteresis Over voltage Threshold Over voltage Threshold Over voltage Hysteresis Vgate Output Voltage Vgate Current Output Drain Sense threshold Drain Sense threshold Drain Sense Output Current Circuit Breaker Threshold Quick-Trip Circuit Breaker Threshold Notes Output Enabled Min. 4.75 2.475 2.425 -0.2 2.475 2.425 2.475 2.425 Typ. Max. Units 5.25 2.525 2.575 2.525 2.575 2.525 2.575 2.525 2.575 2.575 2.525 Vref5
VENTS VENTS VENTSHYS
EN/TS Threshold EN/TS Threshold EN/TS Hysteresis Input High Voltage ENPGA/B, CBMode, CBReset# Input High Voltage ENPGA/B, CBMode, CBReset# CBFault# Output Voltage PG1#, PG2#, PG3# Output
VSENSE Option Option Option Option
2.475 2.425
2.425 2.475 -0.1
ISINK
2041 T4.4
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SMH4803
Preliminary Timing Characteristics, -40oC +85oC Symbol tPDD tCBD Description Detect Delay Vgate enable 50mv Circuit Breaker Delay (Filter) Power Good Delay (PG1/PG2, PG2/PG3) tFSTSHTDN tCYC tVGD tCBRST Fast Shut Down Delay From Fault Vgate Circuit Breaker Cycle Mode Cycle Time Delay from Release Reset Vgate CBReset# Pulse Width Sec. Min. Typ. Unit
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SMH4803
Preliminary
11V13V
2.5V 2.5V
tPDD
PD1#/PD2#
Vgate
2.5V
Drain Sense
50mV
CBSense PG1#
<tCBD
ENPGA PG2#
ENPGB PG3#
2041 ILL18.0
Figure Power Sequencing Timing Characteristics
2041-07 9/23/99
SMH4803
Preliminary
CBMode
50mV
tCBD
tCBD
CBSense tCYC
Vgate CBReset#
2041 ILL16.0
Figure Circuit Breaker Timing Cycle Mode, CBReset# Held High
CBMode tCBD
50mV
CBSense
Vgate
tCYC
CBReset#
2041 ILL17.0
Figure Circuit Breaker Timing Cycle Mode, Used Enable Vgate
2041-07 9/23/99
SMH4803
Preliminary
CBMode
tCBD
50mV
CBSense
Vgate tVGD CBReset# tCBRST
2041 ILL14.0
Figure Circuit Breaker Timing Reset Mode
QCBV
<tCBD
50mV CBSense tFSTSHTDN Vgate
2041 ILL15.0
Figure Circuit Breaker Timing Quick-Trip
2041-07 9/23/99
SMH4803
Preliminary SMH4803 Descripiton NAME (Pin Drain Sense Drain Sense input monitors voltage drain external power MOSFET switch with respect VSS. When MOSFET turned Drain Sense input will driven will used enable conditions outputs. This will prevent premature activation outputs. Vgate Vgate output activates external power MOSFET switch. constant current source (100µA typical) allowing easy programming MOSFET turn slew rate. EN/TS Enable/Temperature Sense input master enable input. When EN/TS LOW, Vgate, outputs off. name suggests, EN/TS input used master enable host system alternatively circuit over-temperature protection using external thermistor. PD1# PD2# detect pins active inputs that prevent power sequence before add-in card properly seated. Both inputs must before either Vgate outputs enabled. applications where multi-length connector pins use, inputs should tied short pins. mating connector side pins opposite should tied directly VSS. Alternatively, either both inputs tied card injector handle switches, insuring power sequencing will occur until card properly seated. CBFault# CBFault# open drain active output, indicating circuit breaker status. When over current condition detected CBFault# driven low. CBReset# CBReset# circuit breaker reset input. actively controlled reset fault condition tied high allow either timed restarts (duty cycle mode) "latch-off" Vgate output. Refer Circuit Breaker Operation associated timing diagrams detailed characteristics. CBMode CBMode input selects circuit breaker operational modes. When tied fault conditions must cleared toggling CBReset# input then high.
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When CBMode tied circuit breaker will placed self-restart cycling mode. state CBReset# input will control operation restart. CBReset# tied Vgate output will automatically restart after tCYC elapsed. fault condition still exists, circuit breaker will trip once again. cycling will continue until fault clears circuit board replaced. Alternatively CBReset# input actively driven VSS. fault occurs Vgate outputs will turned again tCYC after CBReset# input driven high. CBSense circuit breaker sense input used detect overcurrent conditions load connected power MOSFET. value sense resistor (RS) tied series with MOSFET switch; tied other switch CBSense input. voltage drop greater than 50mV (for greater than tCBD) across resistor will result circuit breaker tripping. programmable "quick-trip" sense point also available. CBSense input transitions above threshold, circuit breaker will immediately trip. (10) connected negative side supply. under-voltage (11) over-voltage (12) input pins monitor supply voltage SMH4803 downstream circuits. Both inputs have 2.5V threshold their respective comparators. less than 2.5V greater than 2.5V, Vgate will disabled. 5.0V (13) 5.0V precision volt output reference voltage expand logic-input funtions SMH4803. reference output with respect VSS. 2.5V (14) 2.5V precision volt output reference voltage expand logic-input funtions SMH4803. reference output with respect VSS. ENPGB (15) ENPGB input used independently switch PG3# output. When ENPGB pulled low, PG3# output immediately placed high impedance state. PG2# active ENPGB driven high, then PG3# output will immediately driven low.
SMH4803
Preliminary ENPGA (16) ENPGA input controls PG2# PG3# outputs. When ENPGA pulled low, PG2# output immediately placed high impedance state. ENPGA driven high, then PG2# output will immediately driven low, provided PG1# been active least tPGD. PG3# (17) PG3# open drain active output with internal pull-up. PG3# last power good signal enabled after Vgate, PG1# PG2# have been turned PG3# delayed after PG2# active 2xPGD after PG1# active. PG3# used switch third load DC/DC converter. PG1# (18) PG1# open drain active output with internal pull-up. PG1# enabled after Vgate enabled voltage across load within spec. PG1# used switch load enable DC/DC converter. PG2# (19) PG2# open drain active output with internal pull-up. PG2# enabled after Vgate PG1# have been turned PG2# delayed after PG1# active. PG2# used switch second load DC/DC converter. (20) positive supply connection. internal shunt regulator connected between develops approximately volts that supplies SMH4803. resistor must placed series with limit regulator current application illustrations). PROGRAMMABLE FEATURES Because SMH4803 electrically programmable fine-tuned wide variety applications prior shipment customer. Because this manufacturer common part type across wide range boards that used common host have different electrical loads, power-on timing requirements, host voltage monitoring needs etc. This ability common solution across many platforms shifts focus design away from designing power interface each board concentrating value added back-end logic. Because programming features done final test combinations (all possibilities) readily available shelf stock items. Power Good Delay delay timer that controls delay from PG1# PG2# PG2# PG3# being asserted typical values 5ms, 20ms, 80ms 160ms. Quick-Trip Circuit Breaker Threshold Quick-Trip circuit breaker threshold 200mV, 100mV, 60mv OFF. This threshold voltage drop across that placed between CBSense. Circuit Breaker Delay circuit breaker delay defines period time voltage drop across greater than 50mV less than VQCB before Vgate output will shut down. This effectively filter prevent spurious shutdowns Vgate. delays that programmed 5µs, 50µs, 150µs 400µs. Detect Detect function enabled disabled.
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SMH4803
Preliminary DEVICE OPERATION Power-Up Sequence SMH4803 integrated power controller swappable add-in cards. device operates from single supply ranging from 500V generates signals necessary drive isolated output DC/DC converters. SMH4803 hot-swap controller provides under-voltage over-voltage monitoring host power supply, drives external power MOSFET switch that connects supply load. also protects against over-current conditions that might disrupt host supply. When input output voltages SMH4803 controller within specification, SMH4803 provides three "Power Good" logic outputs that used turn loads drive status light. SMH4803 provides three separate "Power Good" logic outputs that activate loads programmable timed sequence. There master enable/temperature sense input 2.5V reference outputs expanding monitor functions. There "Power Good" enable inputs that used activate deactivate output loads, dutycycle reset over-current protection modes provide automatic manual restart controller after overcurrent load conditions. Insertion Process add-in board inserted into backplane, physical connections must made with chassis discharge electrostatic voltage potentials. board then contacts long pins backplane that provide power ground. soon power applied SMH4803 starts does immediately apply power output load. Under-voltage over-voltage circuits inside controller check input voltage within user-specified range, detection signals determine whether card seated properly. tPDD after these requirements met, hot-swap controller enables Vgate turn power MOSFET switch. Vgate output current limited IVGATE, allowing slew rate easily modified using external passive components. During controlled turn-on period, MOSFET monitored drain sense input. When drops below user-specified voltage power output considered resistor diode series with drain sense input determine Vds(ON). Provided there sustained over-current condition during start-up, SMH4803 turns loads with Power Good logic outputs. Three DC/DC converters connected outputs their turn-on
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sequenced pre-programmed delays. sustained over-current condition occurs during after insertion process, then Vgate shorted MOSFET switch turned protect host supply. Circuit Breaker Operation SMH4803 provides circuit breaker function protect against over current conditions. sustained overcurrent event could damage host supply and/or load circuitry. board's load current passes through series resistor connected between MOSFET source/ CBSense controller. breaker will trip whenever voltage drop across series resistor greater than 50mV more than tCBD, will trip instantaneously voltage drop exceeds VQCB. When breaker trips, Vgate output turned CBFault# will driven circuit breaker reset taking CBReset# then back when circuit breaker reset mode. duty-cycle mode, circuit breaker resets automatically after fixed time period. over current condition still exists after reset, circuit will re-trip. both operating modes circuit breaker, MOSFET switched holding CBReset input value over-current shunt resistor determined following formula: 50mV/Ioc where value shunt resistor over current limit determined board's power requirement limit host supply. Current Sense Resistors Current sense resistors available from number sources come basic formats: open sense resistors current sense resistor chips. open resistors metal strips that available both thru-hole surface mount. resistor chips surface mount offer excellent thermal characteristics. Both styles available resistance ranges from milliohm ohm. (www.irctt.com) source these resistors. open sense resistors found their OARS series, chip resistors found their series. Load Control SMH4803 designed control three more converters, other loads, which incorporate ON/OFF control. Power Good outputs activate loads when following conditions have been met: input voltage SMH4803 monitored within userdefined limits external MOSFET switched SMH4803 three Power Good enable outputs, PG1#, PG2#, PG3#, that turn DC/DC converter loads sequence. Output PG1# activated first, followed PG2# after delay PGD, finally PG3#
SMH4803
Preliminary after another delay PGD. delays built into SMH4803 allow correct sequencing power loads, e.g. supply must come before supply. delay times factory programmed. PG2# PG3# disabled using ENPGA ENPGB inputs. When these inputs they override enable function produced when SMH4803 sees power good condition. PG1#, PG2#, PG3# outputs have withstand capability high voltages must connected these pins. Inexpensive bipolar transistors will boost withstand voltage that host supply, figure connections. Output Slew-Rate Control SMH4803 provides current limited Vgate turn-on. fast turn-off performed internally shorting Vgate Vss. Changing passive components around power MOSFET switch will modify turn-on slew-rate. Operating High Voltages breakdown voltage external active passive components limits maximum operating voltage SMH4803 hot-swap controller. Components that must able withstand full supply voltage are: input output decoupling capacitors, protection diode series with DrainSense pin, power MOSFET switch capacitor connected between drain gate, high-voltage transistors connected power good outputs, dropper resistor connected controller's pin. Over-Voltage Under-Voltage Resistors following examples, three resistors, connected inputs must capable withstanding maximum supply voltage which several hundred volts. trip voltage inputs +2.5V relative Vss. input resistances very high, high value resistors used resistive divider. divider resistors should high stability, metal-film resistors keep under-voltage over-voltage trip points accurate. Telecom Design Example hot-swap telecom application uses power supply with -25% +50% tolerance, i.e. supply vary from 72V. formulae calculating shown below. First select peak current, IDmax, allowed through resistive divider, 250µA. value current arbitrary; however, current high, selfheating become problem (especially high voltage systems), current value becomes very large expensive tolerance.
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calculated from:
over-voltage trip point, i.e. 2.5V, therefore:
2.5V =10K minimum current that flows through resistive divider, IDmin, easily calculated from ratio maximum minimum supply voltages:
Therefore:
value calculated using IDmin.
Vuv)
Where under-voltage trip point, also 2.5V, therefore: (36V 2.5V) 268K
closest standard resistor value 267K calculated using:
2.5V 125µA
-10K (20K 10K)
SMH4803
Preliminary Dropper Resistor Selection SMH4803 powered from high-voltage supply dropper resistor, dropper resistor must provide SMH4803 (and loads) with sufficient operating current under minimum supply voltage conditions, must allow maximum supply current exceeded under maximum supply voltage conditions. dropper resistor value calculated from: max) (IDD Iload) APPLICATIONS CIRCUITS Reversing Polarity Power Good Outputs open-drain Power Good outputs SMH4803 active output polarity changed active when required, with minor circuit change around high-voltage buffer transistor, Figure 1N4148 blocking diode must included prevent high-voltage damage SMH4803. Expanding Enable/Monitoring SMH4803 2.5V reference outputs SMH4803 make easy expand number enable monitoring inputs. circuit Figure illustrates quad low-voltage comparator expands EN/TS input four enable inputs. comparators draw power from output SMH4803 2.5V reference switching threshold. inputs accept either analog CMOS logic level signals between +5V. comparator outputs ANDed together drive EN/TS input. resistor adds hysteresis around comparators prevent oscillation near trip point.
Where Vsmin lowest operating supply voltage, Vddmax upper limit SMH4803 supply voltage, minimum current required SMH4803 operate, Iload additional load current from 2.5V outputs between Vss. min/max current limits easily using dropper resistor except circumstances where input voltage swing over very wide range, e.g. input varies between 100V. these circumstances necessary zener diode between handle wide current range. zener voltage should below nominal regulation voltage SMH4803 that becomes primary regulator. MOSFET Vds(ON) Threshold drain sense input SMH4803 monitors voltage drain external power MOSFET switch with respect Vss. When MOSFET's below user-defined value switch considered Vds(ON) adjusted using resistor, series with drain sense protection diode. This protection blocking diode prevents high voltage breakdown drain sense input when MOSFET switch OFF. inexpensive 1N4002 diode offers protection 100V. Vds(ON) threshold calculated from: Vds(ON) threshold calculated from:
Vsense (Isense Vdiode (IsxRs)
Where Vdiode forward voltage drop protection diode, current flowing through circuit breaker sense resistor Vds(ON) threshold varies over temperature temperature dependence Vdiode. Using 100k gives approximate Vds(ON) threshold
2.5V (10µA 100K) Vdiode 1.0V
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+48V
+48V
PD1# +12V EN/TS ENPGB ENPGA EN/TS ENPGB ENPGA PD1# PD2# CBFault# CBMode CBReset# PD2# 100nF
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100k 100nF 2.5V PG3#
MMBTA06LT1 100k
PG3#
PG2#
Figure Changing Polarity Power Good Output PG1#
PG2# 1N4148
SMH4803
PG1# Drain Sense
CBFault# CBMode CBSense Vgate 100k
100µF 100V
100nF 100V
1N4148
SMH4803
resistor must located close possible MOSFET.
2041 ILL5.6
Preliminary
2041-07 9/23/99
+48V
+48V
+2.5V +12V 100nF ENPGB ENPGA PD1# PD2# CBFault# CBFault# CBMode CBSense Vgate 100nF 100nF
resistor must located close possible MOSFET.
2041 ILL6.6
MMBTA06LT1 100k 100k
@TMAX EN/TS ENPGB ENPGA 2.5V PG3# PD1#
PG3#
PG2#
LMV331
PG1# PG2# 100k PG1# Drain Sense
Figure Overtemperature Shutdown SMH4803
SMH4803
CBMode CBReset# PD2#
100k
100µF 100V
100nF 100V
10nF 100V 1N4148
SMH4803
Preliminary
+48V +2.5V PD1# EN/TS EN/TS ENPGB ENPGA PD1# PD2# CBFault# CBFault# CBMode CBSense Vgate 100nF 100nF
resistor must located close possible MOSFET.
+48V
100k 100nF 2.5V PG3#
MMBTA06LT1 100k
PG3#
PG2#
LMV339
Figure Expanding Input Monitoring Capability
ENPGB ENPGA PG2#
CBMode CBReset# PD2#
PG1# 100k PG1# Drain Sense
SMH4803
100k
100µF 100V 10nF 100V 1N4148
100nF 100V
2041 ILL7.5
SMH4803
Preliminary
2041-07 9/23/99
2041-07 9/23/99
+48V
Figure Typical Application Sequencing DC/DC Converters
+48V +12V
+48V
PD1#
Isolated DC/DC
ISOLATED OUTPUTS
EN/TS EN/TS PD1# 100nF PD2# PD2#
ENPGB
ENPGA
100k
Isolated DC/DC
+48V
PG3#
SMH4803
CBSense PG2# Vgate PG1#
100k
Isolated DC/DC
100k Drain Sense MMBTA06LT1
resistor must located close possible MOSFET.
2041 ILL12.3
SMH4803
Preliminary
RESET2# RESET1#
Figure Sequencing DC/DC Converters with Output Voltage Feedback
RESET
ISOLATED OUTPUTS
RESET
+48V
+48V PD1# +12V EN/TS EN/TS PD1#
100nF
Isolated DC/DC
ENPGB ENPGA
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+48V
Isolated DC/DC
+48V
PG3# PD2#
SMH4803
CBSense
Isolated DC/DC
PD2#
PG2# Vgate PG1#
SMH4803
Drain Sense
Preliminary
resistor must located close possible MOSFET.
2041 ILL9.5
2041-07 9/23/99
RESET2# 2x1N4148
Figure Sequencing Converters with Common Ground Voltage Feedback
RESET
MMBTA56LT1
RESET1#
RESET
Isolated DC/DC
PD1#
PD1#
100nF
PD2#
SMH4803
CBSense PG2# Vgate PG1#
ENPGB
EN/TS
ENPGA
Isolated DC/DC
PG3#
Isolated DC/DC
PD2#
-48V
SMH4803
Drain Sense
Preliminary
resistor must located close possible MOSFET.
2041 ILL11.3
SMH4803
Preliminary 20-Lead Small Outline Package (SOIC)
0.496 0.512 (12.598 13.005)
0.394 0.419 (10.007 10.643)
0.291 0.299 (7.391 7.595) 0.010 0.029 (0.254 0.737) x45° 0.093 0.104 (2.362 2.642) 0.037 0.045 (0.940 1.143
0.009 0.013 (0.229 0.330)
0.016 0.050 (0.406 1.270)
0.050 (1.270) 0.014 0.019 (0.356 0.482)
20pn SOIC ILL.1
0.004 0.012 (0.102 0.305)
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SMH4803
Preliminary ORDERING INFORMATION
SMH4803 Base Part Number Power Good Delay 20ms 80ms 160ms Detect Function Blank Enabled Disabled Circuit Breaker Delay 400µs 150µs 50µs Quick-Trip Threshold 200mV 100mV 60mV 2041 ILL8.3
2041-07 9/23/99
SMH4803
Valid Part Number Combinations
SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803 SMH4803
Preliminary
2041-07 9/23/99
SMH4803
Preliminary
NOTICE SUMMIT Microelectronics, Inc. reserves right make changes products contained this publication order improve design, performance reliability. SUMMIT Microelectronics, Inc. assumes responsibility circuits described herein, conveys license under patent other right, makes representation that circuits free patent infringement. Charts schedules contained herein reflect representative operating parameters, vary depending upon user's specific application. While information this publication been carefully checked, SUMMIT Microelectronics, Inc. shall liable damages arising result error omission. SUMMIT Microelectronics, Inc. does recommend products life support applications where failure malfunction product reasonably expected cause failure life support system significantly affect safety effectiveness. Products authorized such applications unless SUMMIT Microelectronics, Inc. receives written assurances, satisfaction, that: risk injury damage been minimized; user assumes such risks; potential liability SUMMIT Microelectronics, Inc. adequately protected under circumstances. Copyright 1999 SUMMIT Microelectronics, Inc.
2041-07 9/23/99

Distributed Power Hot-Swap Controller FEATURES Supply Range ±20VD

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