SMH4811 Distributed Power Hot-Swap Controller Preliminary Programmable Circuit Breaker Function - Programmable Over-current Filter - Programmable Quick-TripTM Circuit Breaker Values * 2.5V and 5.0V reference outputs - Easy Expansion of External Monitor Functions * FEATURES * Supply Range 20VDC to >500VDC * Versatile Card Insertion Detection Supports Both - Multi-length Pin Systems - Card Injector Switch Sensing * Control powering-on of DC/DC Converters * Highly Programmable Host Voltage Monitoring - Programmable Under- and Over-voltage Detection * Programmable Power Good Delay for enabling the DC/DC Converter ri Fe a t u Quick-Trip e l b og r a m m a reaker tB i C ircu TM Pr ng ASSOCIATE MEMBER FUNCTIONAL BLOCK DIAGRAM 12V ref VDD current limit + EN/TS - Vgate Filter + UV Vgate Sense + OV - Drain Sense Programmable Delay 12V + 2.5V 2.5V ref VSS 5V 5.0V ref PD1# ENPG PD2# PG# CBSense + Programmable Delay - Duty Cycle Timer 50 mV CBFault# + Programmable Quick Response Ref Voltage SUMMIT MICROELECTRONICS, Inc. 2044 ILL B1.1 * 300 Orchard City Drive, Suite 131 (c) SUMMIT MICROELECTRONICS, Inc. 1999 2044-03 9/23/99 * Campbell, CA 95008 * Telephone 408-378-6461 * Fax 408-378-6586 * www.summitmicro.com Characteristics subject to change without notice 1 SMH4811 Preliminary PIN CONFIGURATIONS Symbol Pin Description Drain Sense Vgate EN/TS PD1# PD2# CBFault# CBSense Vss UV OV 5V 2.5V NC ENPG PG# Vdd 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Drain sense input Output to MOSFET gate Enable/Temp Sense input Pin Detect 1 (active LO) Pin Detect 2 (active LO) Circuit Breaker Fault output Circuit Breaker Sense intput Negative Supply Connection Under Voltage input Over Voltage input 5V reference output 2.5V reference output No Connect Enable input Power good output Positive supply connection Drain Sense 1 16 Vdd Vgate 2 15 PG# EN/TS 3 14 ENPG PD1# 4 13 NC PD2# 5 12 2.5Vref CBFault# 6 11 5.0Vref CBSense 7 10 OV 8 9 UV Vss 2044 ILL1.1 2044 PGM T2.1 RECOMMENDED OPERATING CONDITIONS Condition Temperature Min Max -40C +85C 2044 PGM T3.0+ DESCRIPTION The SMH4811 is designed to control hot swapping of plug-in cards operating from a single supply ranging from 20V to 500V. The SMH4811 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 SMH4811 controller are within specification, the SMH4811 provides a "Power Good" logic output that may be used to turn ON the loads, e.g. isolated-output DC-DC converter, or drive a LED status light. Additional features of the SMH4811 include: temperature sense or master enable input, 2.5V and 5V reference outputs for expanding monitor functions, two "Pin-Detect" enable inputs for fault protection, and a duty-cycle over-current protection. 2044-03 9/23/99 2 SMH4811 Preliminary ABSOLUTE MAXIMUM RATINGS Temperature Under Bias -55C to +125C Storage Temperature -65C to +150C Voltage on pins with respect to VSS Vdd -0.5V to Vdd UV, OV, CBSense, Drain Sense -0.5V to Vdd + 0.5V PD1#, PD2#, ENPG, EN/TS 10V CBFault#, PG# -0.5V to Vdd + 0.5V Vgate Vdd + 0.5V Lead Solder Temperature (10 secs) 300 C *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 specification is not implied. Exposure to any absolute maximum rating for extended periods may affect device performance and reliability. DC OPERATING CHARACTERISTICS (Over Recommended Operating Conditions, Voltages are relative to VSS) Symbol Parameter VDD Vref5 ILOAD5 Vref2.5 Vref2.5 ILOAD2.5 IDD VUV VUV VUVHYS VOV VOV VOVHYS VVGATE IVGATE VSENSE VSENSE ISENSE VCB VQCB Supply Voltage 5Volt Reference Output 5Volt Reference Output Current 2.5 Volt Reference Output 2.5 Volt Reference Output 2.5 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 VENTS VENTS VENTSHYS VIH VIL VOL VOL EN/TS Threshold EN/TS Threshold EN/TS Hysteresis Input High Voltage ENPG, CBReset# Input High Voltage ENPG CBFault# Output Low Voltage PG Output Low Notes Min. Typ. IDD = 2mA IDD = 2mA IDD = 2mA TA = 25 C, IDD = 2mA IDD = 2mA IDD = 2mA Output Enabled TA = 25 C, IDD = 2mA IDD = 2mA IDD = 2mA TA = 25 C, IDD = 2mA IDD = 2mA IDD = 2mA 11 4.75 -1 2.475 2.425 -0.2 2 2.475 2.425 12 5 2.475 2.425 2.5 2.5 2.5 2.5 10 2.5 2.5 10 Max. Units 13 5.25 1 2.525 2.575 1 10 2.525 2.575 2.525 2.575 VDD TA = 25 C, IDD = 2mA IDD = 2mA VSENSE = VSS IDD = 2mA Option E Option F Option H Option J TA = 25 C, IDD = 2mA IDD = 2mA IDD = 2mA IOL = 2mA ISINK = 2mA 2.475 2.425 9 40 2.475 2.425 5 2 -0.1 0 0 100 2.5 2.5 10 50 200 100 50 OFF 2.5 2.5 10 2.525 2.575 11 60 2.525 2.575 15 Vref5 0.8 0.4 0.4 V V mA V V mA mA V V mV V V mV V A V V A mV mV mV mV V V mV V V V V 2044 PGM T4.3 2044-03 9/23/99 3 SMH4811 Preliminary AC Timing Characteristics, -40oC to +85oC Symbol tPDD tCBD Description Pin Detect Delay to Vgate enable 50mv Circuit Breaker Delay (Filter) PGD Min. 80 Typ. Max ms Unit K L M N 400 150 50 5 s s s s A B C D 5 20 80 180 200 ms ms ms ms ns 1.5 Sec. Power Good Delay Fast Shut Down Delay From Fault to Vgate Off Circuit Breaker Cycle Mode Cycle Time tFSTSHTDN tCYC 11V13V VDD 2.5V ref UV 2.5V ref OV tPDD PD1#/PD2# Vgate 2.5V ref Drain Sense 50mV ref CBSense <tCBD PGD PG# 2044 ILL2.0 Figure 1. Power Sequencing Timing Characteristics 2044-03 9/23/99 4 SMH4811 Preliminary tCBD tCBD 50mV CBSense tCYC Vgate 2044 ILL3.2 Figure 2. Circuit Breaker Timing QCBV <tCBD 50mV CBSense tFSTSHTDN Vgate 2044 ILL6.0 Figure 3. Circuit Breaker Timing - Quick-Trip 2044-03 9/23/99 5 SMH4811 Preliminary SMH4811 Pin Descripiton VSS (8) VSS is connected to the negative side of the supply. PIN NAME (Pin #) Drain Sense (1) The Drain Sense input monitors the voltage at the drain of the external power MOSFET switch with respect to VSS. When the MOSFET is turned on, the Drain Sense input will be driven low and will be used as one of the enable conditions for the PG outputs. This will prevent any premature activation of the PG outputs. UV and OV (9 & 10) The under-voltage (11) and over-voltage (12) input pins monitor the supply voltage for the SMH4811 and the downstream circuits. Both inputs have a 2.5V threshold on their respective comparators. If UV is less than 2.5V or if OV is greater than 2.5V, Vgate will be disabled. 5.0V (11) 5.0V is a precision 5 volt output reference voltage tha may be use to expand the logic-input funtions on the SMH4811. The reference output is with respect to VSS. Vgate (2) The Vgate output activates an external power MOSFET switch. It is a constant current source (100A typical) allowing easy programming of the MOSFET turn on slew rate. 2.5V (12) 2.5V is a precision 2.5 volt output reference voltage tha may be use to expand the logic-input funtions on the SMH4811. The reference output is with respect to VSS. EN/TS (3) The Enable/Temperature Sense input is the master enable input. When EN/TS is LOW, Vgate, and the PG outputs are off. As the name suggests, the EN/TS input may be used as a master enable by a host system or alternatively for circuit over-temperature protection using an external thermistor. ENPG (14) The ENPG input may be used to independently switch off the PG# output. When ENPG is pulled low, the PG# output is immediately placed in a high impedance state. PG# (15) PG# is an open drain active low output with no internal pull-up. PG# is enabled after Vgate has been turned on. PG# is delayed PGD after Vgate is active. PG# can be used to switch a second load or a DC/DC converter. PD1# and PD2# (4 & 5) The pin detect pins are active LOW inputs that are use to prevent any power sequence before the add-in card is properly seated. Both inputs must be at VSS before either Vgate or the PG outputs can be enabled. VDD (16) VDD is the positive supply connection. An internal shunt regulator connected between VDD and VSS develops approximately 12 volts that supplies the SMH4811. A resistor must be placed in series with the VDD pin to limit the regulator current (RD in the application illustrations). In applications where multi-length connector pins are use, the PD inputs should be tied to the short pins. On the mating connector side the pins opposite should be tied directly to VSS. Alternatively, either one or both of the PD inputs can be tied to card injector handle switches, insuring no power sequencing will occur until the card is properly seated. PROGRAMMABLE FEATURES CBFault# (6) CBFault# is an open drain active low output, indicating the circuit breaker status. When an over current condition is detected CBFault# is driven low. Because the SMH4811 is electrically programmable it can be fine-tuned for a wide variety of applications prior to shipment to the customer. Because of this a manufacturer can use a common part type across a wide range of boards that are used on a common host but have different electrical loads, power-on timing requirements, host voltage monitoring needs etc. CBSense (7) The circuit breaker sense input is used to detect overcurrent conditions in the load connected to the power MOSFET. A low value sense resistor (RS) is tied in series with the MOSFET switch; one end tied to VSS and the other to the switch and the CBSense input. A voltage drop of greater than 50mV (for greater than tCBD) across the resistor will result in the circuit breaker tripping. A programmable "quick-trip" sense point is also available. If the CBSense input transitions above the threshold, the circuit breaker will immediately trip. This ability to use a common solution across many platforms shifts the focus of design away from designing a new power interface for each board to concentrating on the value added back-end logic. Because the programming of the features is done at final test all combinations (all 128 possibilities) are readily available as off the shelf stock items. 2044-03 9/23/99 6 SMH4811 Preliminary Power Good Delay The PG delay timer that controls the delay from Vgate to PG# being asserted can be set to typical values of 5ms, 20ms, 80ms or 160ms. tPDD after these requirements are met, the hot-swap controller enables Vgate to turn on the power MOSFET switch. The Vgate output is current limited to IVGATE, allowing the slew rate to be easily modified using external passive components. During the controlled turn-on period, the Vds of the MOSFET is monitored by the drain sense input. When Vds drops below a user-specified voltage the power output is considered to be ON. The resistor and diode in series with the drain sense input determine Vds(ON). Quick-Trip Circuit Breaker Threshold The Quick-Trip circuit breaker threshold can be set to 200mV, 100mV, 60mv or OFF. This is the threshold voltage drop across RS that is placed between VSS and CBSense. Circuit Breaker Delay The circuit breaker delay defines the period of time the voltage drop across RS is greater than 50mV but less than VQCB before the Vgate output will be shut down. This is effectively a filter to prevent spurious shutdowns of Vgate. The delays that can be programmed are 5s, 50s, 150s and 400s. Provided there is no sustained over-current condition during start-up, the SMH4811 turns on the loads with the Power Good logic outputs. Three DC/DC converters can be connected to the outputs and their turn-on is sequenced by pre-programmed delays. If a sustained over-current condition occurs during or after the insertion process, then Vgate is shorted to Vss and the MOSFET switch is turned off to protect the host supply. Pin Detect The Pin Detect function can be enabled or disabled. Circuit Breaker Operation The SMH4811 provides a circuit breaker function to protect against over current conditions. A sustained overcurrent event could damage the host supply and/or the load circuitry. The board's load current passes through a series resistor connected between MOSFET source/ CBSense and Vss on the controller. The breaker will trip whenever the voltage drop across the series resistor is greater than 50mV for more than tCBD, and will trip instantaneously if the voltage drop exceeds VQCB. DEVICE OPERATION Power-Up Sequence The SMH4811 is an integrated power controller for hot swappable add-in cards. The device operates from a single supply ranging from 20V to 500V and generates the signals necessary to drive isolated output DC/DC converters. The SMH4811 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. It also protects against over-current conditions that might disrupt the host supply. When the breaker trips, the Vgate output is turned off and CBFault# will be driven LO. In duty-cycle mode, the circuit breaker resets automatically after a fixed time period. If the over current condition still exists after reset, the circuit will re-trip. The MOSFET can be switched off by holding the CBReset input LO. When the input and output voltages to the SMH4811 controller are within specification, the SMH4811 provides a "Power Good" logic output that may be used to turn ON a load or drive an LED status light. There is a master enable/temperature sense input and 2.5V and 5V reference outputs for expanding monitor functions. The value of the over-current sense resistor is determined by the following formula: Rs = 50mV/Ioc where Rs is the value of the sense resistor and Ioc is the over current limit determined by the board's power requirement or the limit of the host supply. Insertion Process As the add-in board is inserted into the backplane, physical connections must be made with the chassis to discharge any electrostatic voltage potentials. The board then contacts the long pins on the backplane that provide power and ground. As soon as power is applied the SMH4811 starts up but does not immediately apply power to the output load. Under-voltage and over-voltage circuits inside the controller check to see if the input voltage is within a user-specified range, and pin detection signals determine whether the card is seated properly. Current Sense Resistors Current sense resistors are available from a number of sources and come in two basic formats: open air sense resistors and current sense resistor chips. The open air resistors are metal strips that are available as both thru-hole and surface mount. The resistor chips are surface mount and offer excellent thermal characteristics. Both styles are available in resistance ranges from 3 milliohm to 1 ohm. IRC (www.irctt.com) is one source for these resistors. The open air sense resistors can be found in their OARS series, and the chip resistors are found in their LRC series. 2044-03 9/23/99 7 SMH4811 Preliminary Load Control The SMH4811 is designed to control a single DC/DC converter, or other loads, which incorporate ON/OFF control. The Power Good output activates the load when the following conditions have been met: the input voltage to the SMH4811 monitored by UV and OV is within user-defined limits and the external MOSFET is switched ON. R1 is calculated from: Vov R1 = ID max VOV is the over-voltage trip point, i.e. 2.5V, therefore: 2.5V R1 = 250 A =10K 2) The minimum current that flows through the resistive divider, IDmin, is easily calculated from the ratio of maximum and minimum supply voltages: The delays built into the SMH4811 allow correct sequencing of power to the loads. The delay time is factory programmed. The PG# output has a 12V withstand capability so high voltages must not be connected to this pin. Inexpensive bipolar transistors will boost the withstand voltage to that of the host supply, see figure 5 for connections. ID min = Output Slew-Rate Control The SMH4811 provides a current limited Vgate turn-on. A fast turn-off is performed by internally shorting Vgate to Vss. Changing the passive components around the power MOSFET switch will modify the turn-on slew-rate. ID max x VS min VS max Therefore: 250 A x 36V = 125 A 72V 3) The value of R3 is now calculated using IDmin. ID min = Operating at High Voltages The breakdown voltage of the external active and passive components limits the maximum operating voltage of the SMH4811 hot-swap controller. Components that must be able to withstand the full supply voltage are: the input and output decoupling capacitors, the protection diode in series with DrainSense pin, the power MOSFET switch and capacitor connected between its drain and gate, the highvoltage transistors connected to the power good outputs, and the dropper resistor connected to the controller's Vdd pin. R3 = (VS min - Vuv) ID min Where Vuv is the under-voltage trip point, also 2.5V, therefore: R3 = Over-Voltage and Under-Voltage Resistors In the following examples, the three resistors, R1, R2, and R3, connected to the OV and UV inputs must be capable of withstanding the maximum supply voltage which can be several hundred volts. The trip voltage of the UV and OV inputs is +2.5V relative to Vss. As the input resistances of UV and OV are very high, high value resistors can be used in the resistive divider. The divider resistors should be high stability, 1% metal-film resistors to keep the under-voltage and over-voltage trip points accurate. (36V - 2.5V) = 268K 125 A The closest standard 1% resistor value is 267K 4) R2 may be calculated using: (R1 + R2) = R2 = Telecom Design Example A hot-swap telecom application uses a 48V power supply with a -25% to +50% tolerance, i.e. the 48V supply can vary from 36V to 72V. The formulae for calculating R1, R2, and R3 are shown below. Vuv ID min Vuv ID min -R1 2.5V 125A -10K = (20K - 10K) = 10K Or R2 = 1) First select the peak current, IDmax, allowed through the resistive divider, say 250A. The value of current is arbitrary; however, if the current is too high, self-heating in R3 may become a problem (especially in high voltage systems), and if the current is too low the value of R3 becomes very large and may be expensive at 1% tolerance. 2044-03 9/23/99 8 SMH4811 Preliminary Dropper Resistor Selection The SMH4811 is powered from the high-voltage supply via a dropper resistor, Rd. The dropper resistor must provide the SMH4811 (and its loads) with sufficient operating current under minimum supply voltage conditions, but must not allow the maximum supply current to be exceeded under maximum supply voltage conditions. APPLICATIONS CIRCUITS Reversing Polarity of the Power Good Outputs The open-drain Power Good outputs on the SMH4811 are active LO. The output polarity may be changed to active HI, when required, with a minor circuit change around the high-voltage buffer transistor, see Figure 5. The 1N4148 blocking diode must be included to prevent high-voltage damage to the SMH4811. The dropper resistor value is calculated from: RD = Temperature Sensing on the SMH4811 The 2.5V reference and 5V outputs on the SMH4811 make it easy to expand the enable or monitoring inputs. The circuit in Figure 4 illustrates how a low-voltage comparator is used to make an over-temperature detector. The comparator draws power from the 5V output on the SMH4811 and uses the 2.5V reference for the switching threshold. R6 is an NTC resistor that causes the SMH4811 to shut down when the maximum ambient temperature is exceeded. The temperature trip point is altered by changing R6 and/or R7. A 1M resistor adds hysteresis around the comparator to prevent oscillation near the trip point. (VS min - VDD max) (IDD + Iload) Where Vsmin is the lowest operating supply voltage, Vddmax is the upper limit of the SMH4811 supply voltage, Idd is minimum current required for the SMH4811 to operate, and Iload is any additional load current from the 2.5V and 5V outputs and between Vdd and Vss. The min/max current limits are easily met using the dropper resistor except in circumstances where the input voltage may swing over a very wide range, e.g. input varies between 20V and 100V. In these circumstances it may be necessary to add an 11V zener diode between Vdd and Vss to handle the wide current range. The zener voltage should be below the nominal regulation voltage of the SMH4811 so that it becomes the primary regulator. MOSFET Vds(ON) Threshold The drain sense input on the SMH4811 monitors the voltage at the drain of the external power MOSFET switch with respect to Vss. When the MOSFET's Vds is below the user-defined value the switch is considered to be ON. The Vds(ON) is adjusted using the resistor, Rt, in series with the drain sense protection diode. This protection or blocking diode prevents high voltage breakdown of the drain sense input when the MOSFET switch is OFF. An inexpensive 1N4148 diode offers protection up to 75V. The Vds(ON) threshold is calculated from: The Vds(ON) threshold is calculated from: Vds = Vsense - (Isense x Rt) - Vdiode - (IsxRs) Where Vdiode is the forward voltage drop of the protection diode, and Is is the current flowing through the circuit breaker sense resistor Rs. The Vds(ON) threshold varies over temperature due to the temperature dependence of Vdiode. Using 100k for Rt gives an approximate Vds(ON) threshold of: Vds = 2.5V - (10A x 100K) - Vdiode = 2.5 - 1.0 - 0.5 = 1.0V 2044-03 9/23/99 9 SMH4811 Preliminary +48V +48V Rd PD1# VDD CBFault# ENPG Host Backplane UV 100K EN/TS SMH4811 R2 R4 2.5V ref OV R5 R1 CBSense PD2# VSS 100nF 25V Drain Sense Vgate 1K 100nF 10 20m R6 + -U1 R7 100K 1N4148 * 10nF 100V G S D The 10 resistor must be located as close as possible to the MOSFET 0V PG# MMBTA06LT1 5V ref PG# R3 100nF 100nF 100V 4.7F 100V R4 = 1K R5 = 1M R6 = NTC 50K @TMAX R7 = 50K U1 = LMV331 2044 ILL7.2 Figure 4. The basic distributed power Hot Swap using the SMH4811. Note the relative length of the power pins vs. the `pin detect' pins. The physical implementation insures the add-in card has power to the SMH4811, but power to the backend circuits cannot be turned on until the card is properly seated. Note the use of the 2.5Vref and 5Vref outputs and how they support the peripheral circuits. In this example, ENPG is pulled high to the self-generated 5Vref. The shaded circuit is a temperature sensor that is effectively a safety shut down circuit tied into the EN/TS input. If the LMV331 drives its output low, it will immediately turn off the Vgate output. Refer to the datasheet text for details on calculating the values for R1, R2, R3 and Rd. +48V Rd PD1# ENPG EN/TS VDD CBFault# R3 PG UV SMH4811 MMBTA06LT1 PG# 1N4148 R2 47K 5V ref OV R1 PD2# VSS CBSense Vgate 1K 100nF 100nF 25V 10nF 100V * 10 0V Drain Sense S 20m G 100nF 100K 1N4148 100nF 100V 4.7F 100V D The 10 resistor must be located as close as possible to the MOSFET 2044 ILL8.2 Figure 5. This is a generic Hot Swap implementation with a +48V supply illustrating changing the polarity of the PG# output. EN/TS and ENPG are under the control of the host system. 2044-03 9/23/99 10 SMH4811 Preliminary +48V Rd R3 PD1# EN/TS ENPG .01F VDD CBFault# .01F +VIN +VOUT .01F DC/DC Converter 47F UV SMH4811 R2 -VIN 5V ref .01F 47F -VOUT ON/OFF 100K .01F OV PG# Drain Sense R1 PD2# VSS 100nF 25V CBSense 100nF 25V Vgate 100nF 20m 1K MMBTA06LT1 Close proximity of the remote off/on circuit is required for proper performance 100K 1N4148 * 10 10nF 100V G S D The 10 resistor must be located as close as possible to the MOSFET 0V 2044 ILL9.2 Figure 6. A typical +48V distributed power Hot Swap application circuit for controlling a DC/DC converter with a remote off/on function. It should be noted the board layout for the DC/DC converters is critical for proper operation. Most manufacturers will have detailed technical notes to assist with this. An excellent note is "Application Guidelines for OnBoard Power Converters" from Lucent Technologies. 100K 0V case gnd connections 3 places Rd .01F R3 EN/TS ENPG PD1# VDD DC/DC Converter CBFault# +VIN .01F UV OV PG# Drain Sense R1 PD2# VSS CBSense 100nF 100nF 25V 20m 100K Vgate * 10 1K + .01F -VIN 100K 47F COM 47F 5V ref SMH4811 R2 -48V + .01F + 100nF 25V +VOUT 47F -VOUT ON/OFF .01F .01F MMBTA06LT1 100K 1N4148 10nF 100V G S D The 10 resistor must be located as close as possible to the MOSFET 2044 ILL10.2 Figure 7. A typical +48V distributed power Hot Swap application circuit for controlling a dual DC/DC converter with a remote off/on function. Note: Pin detect inputs must be connected to the 48V input when the card is inserted, not to the OV input. 2044-03 9/23/99 11 SMH4811 Preliminary SSOP Package Drawing and Dimensions D JEDEC MO-137 H 1 S E A hx45 C 0 to 8 typ L A A1 A2 B C D E e H h L N S Common dimensions Min Nom Max .061 .064 .068 .004 .006 .0098 .055 .058 .061 .008 .010 .012 .0075 .008 .0098 See Variations .150 .155 .157 .025BSC .230 .236 .244 .010 .013 .016 .016 .025 .035 Pin Count See Variations A A1 A2 B C D E e H h L N S Common dimensions Min Nom Max 1.55 1.63 1.73 0.12 0.15 0.25 1.40 1.47 1.55 0.20 0.25 0.31 0.19 0.20 0.25 See Variations 3.81 3.94 3.99 0.635 BSC 5.84 5.99 6.20 0.25 0.33 0.41 0.41 0.64 0.89 Pin Count See Variations A2 e B A1 SSOP ILL.0 This Table in Inches Pin Count Dimension "D" Min Nom Max 16 .189 .194 .196 20 .337 .342 .344 24 .337 .342 .344 28 .386 .391 .393 Min .0020 .0500 .0250 .0250 Dimension "S" Nom Max .0045 .0070 .0525 .0550 .0275 .0300 .0280 .0300 This Table in Millimeters Pin Count Dimension "D" Min Nom Max 16 4.80 4.93 4.98 20 8.56 8.69 8.74 24 8.56 8.69 8.74 28 9.80 9.93 9.98 Min 0.05 1.27 0.64 0.64 Dimension "S" Nom Max 0.11 0.18 1.33 1.40 0.70 0.76 0.71 0.76 2044-03 9/23/99 12 SMH4811 Preliminary 16-Lead Small Outline Package (SOIC) .0085 .0010 (After Plating) 0.390 0.005 9 0.1550.005 0.236 0.008 16 IC SO 16 0.151 0.005 155 0.005 Pin 1 Index 1 8 0 8 0.016 0.003 0.05 BSC DETAIL A .016 .002 7 1 7 1 0.024 0.002 45 1 0.054 0.005 0.069 MAX .004 .007 .003 0.007 0.003 7 1 0.390 0.005 0.023 0.005 0.041 Note: 1. Reference: JEDEC publication MS-012 PTX 360-120 2. Unit: Inches 3. Mold flash, protrusion & gate burr shall not exceed 0.006 inch per side. DETAIL A 16.soic-ILL.1 ORDERING INFORMATION SMH4811 A E K P Base Part Number Pin Detect Function Blank = Enabled P = Disabled Package S = SOIC G = SSOP Circuit Breaker Delay K = 400s L = 150s M = 50s N = 5s Power Good Delay A = 5ms B = 20ms C = 80ms D = 160ms Quick-Trip Threshold E = 200mV F = 100mV H = 60mV 2044 ILL11.0 J = OFF 2044-03 9/23/99 13 SMH4811 Preliminary Valid Part Number Combinations SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B E E E E E E E E F F F F F F F H H H H H H H H H J J J J J J J J E E E E E E E E F F F F F F F H H H H H H H H H J J J J J J J J K L M N K L M N K L M N K L M N K L M N K L M N K L M N K L M N K L M N K L M N K L M N K L M N K L M N K L M N K L M N K L M N SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 SMH4811 P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P 2044-03 9/23/99 14 C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C D D D D D D D D D D D D D D D D D D D D D D D D D D D D D D D D E E E E E E E E F F F F F F F H H H H H H H H H J J J J J J J J E E E E E E E E F F F F F F F H H H H H H H H H J J J J J J J J K L M N K L M N K L M N K L M N K L M N K L M N K L M N K L M N K L M N K L M N K L M N K L M N K L M N K L M N K L M N K L M N P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P SMH4811 Preliminary 2044-03 9/23/99 15 SMH4811 Preliminary NOTICE SUMMIT Microelectronics, Inc. reserves the right to make changes to the products contained in this publication in order to improve design, performance or reliability. SUMMIT Microelectronics, Inc. assumes no responsibility for the use of any circuits described herein, conveys no license under any patent or other right, and makes no representation that the circuits are free of patent infringement. Charts and schedules contained herein reflect representative operating parameters, and may vary depending upon a user's specific application. While the information in this publication has been carefully checked, SUMMIT Microelectronics, Inc. shall not be liable for any damages arising as a result of any error or omission. SUMMIT Microelectronics, Inc. does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless SUMMIT Microelectronics, Inc. receives written assurances, to its satisfaction, that: (a) the risk of injury or damage has been minimized; (b) the user assumes all such risks; and (c) potential liability of SUMMIT Microelectronics, Inc. is adequately protected under the circumstances. (c) Copyright 1999 SUMMIT Microelectronics, Inc. 2044-03 9/23/99 16