19-176; Rev ; 7/1 +65V Simple Swapper Hot-Swap Switches General Description The MX591/MX5917 are fully integrated hot-swap switches for positive supply rails. These devices allow the safe insertion and removal of circuit cards into live backplanes or ports without causing glitches on the backplane power-supply rail. They also monitor various circuit parameters and disconnect the load if a fault condition occurs, alerting the host with a logic-level IFULT output. The MX591/MX5917 operate over a +1V to +65V input voltage range. They are designed to permit hot plugging of an internet appliance such as an IP phone but are not limited to that application. During startup, an internal power FET regulates the current between the backplane power source and the load to 28m for the MX591, 567m for the MX5917, and 42m for the MX5917. fter startup, the FET is fully enhanced to reduce its on-resistance. To ensure robust operation, the MX591/MX5917 contain builtin safety features that prevent damage to the internal FET. They include an enable input, which responds to positive logic signals (+3.3V or +5V), allowing the host system to disconnect the load. The MX591/MX5917 Simple Swapper hot-swap Is monitor four parameters for fault conditions: undervoltage lockout (), power-not-good, zero-current detection, and thermal shutdown. These devices are available in the extended temperature range, -4 to +85. The MX591 comes in an 8-pin SO package and the MX5917/ is available in a 16-pin SO package. IP Phones Power-Over-LN Power-Over-MDI Remote Power Distribution Network Routers Network Switches Internet ppliances pplications Features Provides Safe Hot Swap for +1V to +65V Power Supplies IEEE 82.3af ompliant (MX5917) Startup into 5µF Load (MX5917) 28m urrent Limit for MX591 567m urrent Limit for MX5917 42m urrent Limit for MX5917 Zero-urrent Load Detection Integrated 2.2Ω Power FET Status Output Reports Fault onditions Internal Switch-Protection ircuitry uilt-in Thermal Shutdown (+42V) ON OFF ENLE Ordering Information PRT TEMP. RNGE PIN-PKGE MX591ES -4 to +85 8 SO MX5917ESE* -4 to +85 16 SO MX5917ESE -4 to +85 16 SO *Future product contact factory for availability. Typical Operating ircuit MX591 MX5917 IFULT 1kΩ 1kΩ +3.3V L O D MX591/MX5917 Pin onfigurations appear at end of data sheet. Simple Swapper is a trademark of Maxim Integrated Products, Inc. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim s website at www.maxim-ic.com.
MX591/MX5917 SOLUTE MXIMUM RTINGS, to...-.3v to +7.V ENLE to...-.3v to +12.V, IFULT to...-.3v to +12.V to...-.3v to ( +.3V), IFULT Sink urrent...1m ontinuous Power Dissipation (T = +7 ) 8-Pin SO (derate 5.9mW/ above +7 )...47mW 16-Pin SO (derate 12.9mW/ above +7 )...139mW Stresses beyond those listed under bsolute 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 beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELETRIL HRTERISTIS Operating Temperature Range...-4 to +85 Maximum Junction Temperature...+15 Storage Temperature Range...-6 to +15 Lead Temperature (soldering 1s)...+3 ( = +42V, =, = open circuit, V ENLE = +3.3V, and T = -4 to +85, unless otherwise noted. Typical values are at T = +25.) PRMETER SYMOL ONDITIONS MIN TYP MX UNITS Input Voltage Range 1 65 V Supply urrent I IN = 1V to 65V (Note 1) 1.2 2.5 m Output urrent Limit I LIM = - 5V, = 1V to 65V ontinuous Operating Output urrent I OUT (Note 2) MX591 25 28 31 MX5917 51 567 623 MX5917 37 42 47 MX591 24 MX5917 4 MX5917 35 m m DMOS On-Resistance R DS(ON) MX591, I OUT = 2m MX5917, I OUT = 4m = 1V to 65V, MX5917, I OUT = 3m 2.2 4 Ω ENLE Voltage Logic Low V LOW.8 V ENLE Voltage Logic High V HIGH 2.4 V ENLE High Input urrent I IH V ENLE = +5V 1 µ IFULT Output Leakage urrent I OH IFULT = 1V, I OH > (IF TH + IF HYS ) 1 µ Output Leakage urrent IL = 1V, > V PG 1 µ to Leakage urrent IL IN/OUT ENLE =, = +65V 1 µ /IFULT Output Logic Low V OL Sink current = 3m.4 V Threshold V PG Percentage of, rising 71 78 85 % Hysteresis PG HYS Percentage of 1 % Zero-urrent Detection Threshold IF TH Decreasing output current MX591 2 12 25 MX5917 2 6 1 MX5917 2 12 25 m 2
ELETRIL HRTERISTIS (continued) ( = +42V, =, = open circuit, V ENLE = +3.3V, and T = -4 to +85, unless otherwise noted. Typical values are at T = +25.) PRMETER SYMOL ONDITIONS MIN TYP MX UNITS Zero-urrent Detection Threshold Hysteresis IF HYS Percentage of IF TH 1 % IFULT Output Delay t IFD (Figure 1) 7 12 17 ms Output Delay t PGD (Figure 2) 7 12 17 ms Thermal Shutdown Temperature T J Die temperature increasing 14 Thermal Shutdown Hysteresis T JHYS 3.5 Default Undervoltage Lockout V decreasing 24.5 26.5 28.5 V Undervoltage Lockout Hysteresis Minimum Undervoltage Lockout Threshold Undervoltage Lockout Input Resistance HYS Percentage of V 11 % V (MIN) connected to, decreasing o o 7 7.5 8 V R Force I = 5µ into pin 26 kω MX591/MX5917 Note 1: Measured at pin at the end of the output voltage slew. Note 2: Guaranteed by R DSON test. Limited by package power dissipation. I OUT V PG IF TH t IFD t PGD IFULT 3.3V 3.3V Figure 1. IFULT Delay Figure 2. Power-Good Delay 3
MX591/MX5917 Typical Operating haracteristics ( = +42V, =, = open circuit, V ENLE = 3.3V, R L = 1.8kΩ, T = +25, unless otherwise noted). SUPPLY URRENT (m) 2. 1.6 1.2.8.4 SUPPLY URRENT vs. SUPPLY VOLTGE NO LOD 1 2 3 4 5 6 SUPPLY VOLTGE (V) MX591 toc1 SUPPLY URRENT (m) 2. 1.6 1.2.8.4 SUPPLY URRENT vs. TEMPERTURE NO LOD -4-15 1 35 6 85 TEMPERTURE ( ) MX591 toc2 ON-RESISTNE (Ω) 3. 2.6 2.2 1.8 1.4 ON-RESISTNE vs. TEMPERTURE I LOD = 15m 1. -4-15 1 35 6 85 TEMPERTURE ( ) MX591 toc3 MX591 TURN-ON WVEFORMS (R L = 1.8kΩ, L = ) MX591 toc4 MX591 TURN-OFF WVEFORMS (R L = 1.8kΩ, L = ) MX591 toc5 MX591 TURN-ON WVEFORMS (R L = 1.8kΩ, L = 47µF) MX591 toc6 : ENLE, 5V/div :, 2V/div :, 5V/div : ENLE, 5V/div :, 2V/div :, 5V/div : ENLE, 5V/div :, 2V/div :, 5V/div 4
Typical Operating haracteristics (continued) ( = +42V, =, = open circuit, V ENLE = 3.3V, R L = 1.8kΩ, T = +25, unless otherwise noted). MX591 TURN-OFF WVEFORMS (R L = 1.8kΩ, L = 47µF) : ENLE, 5V/div :, 2V/div :, 5V/div MX591 toc7 MX591 ZERO-URRENT RESPONSE : I OUT, 1m/div : IFULT, 5V/div :, 2V/div MX591 toc8 MX591 OVER-URRENT RESPONSE 4ms/div : I OUT, 2m/div : IFULT, 5V/div :, 2V/div (SHORTED TO ) MX591 toc9 MX591/MX5917 MX5917 TURN-ON WVEFORMS (R L = 1.8kΩ, L = ) MX591 toc1 MX5917 TURN-OFF WVEFORMS (R L = 1.8kΩ, L = ) MX591 toc11 MX5917 TURN-ON WVEFORMS (R L = 1Ω, L = 47µF) MX591 toc12 : ENLE, 5V/div :, 2V/div :, 5V/div : ENLE, 5V/div :, 2V/div :, 5V/div : ENLE, 5V/div :, 2V/div :, 5V/div 5
MX591/MX5917 Typical Operating haracteristics (continued) ( = +42V, =, = open circuit, V ENLE = 3.3V, R L = 1.8kΩ, T = +25, unless otherwise noted). MX5917 TURN-OFF WVEFORMS (R L = 1.8kΩ, L = 47µF) : ENLE, 5V/div :, 2V/div :, 5V/div MX591 toc13 MX5917 TURN-ON WVEFORMS (R L = 3Ω, L = 5µF) : ENLE, 5V/div :, 2V/div :, 5V/div 1ms/div MX591 toc14 MX5917 TURN-OFF WVEFORMS (R L = 3Ω, L = 5µF) : ENLE, 5V/div :, 2V/div :, 5V/div 1ms/div MX591 toc15 MX5917 ZERO-URRENT RESPONSE MX591 toc16 MX5917 OVER-URRENT RESPONSE MX591 toc17 IOUT (m) 3 29 28 27 MX591 I OUT vs. TEMPERTURE MX591 toc18 26 : I OUT, 1m/div : IFULT, 5V/div :, 2V/div 4ms/div : I OUT, 2m/div : IFULT, 5V/div :, 2V/div (SHORTED TO ) 25-4 -15 1 35 6 85 TEMPERTURE ( ) 6
Typical Operating haracteristics (continued) ( = +42V, =, = open circuit, V ENLE = 3.3V, R L = 1.8kΩ, T = +25, unless otherwise noted). IOUT (m) 45 43 41 39 37 35 MX5917 I OUT vs. TEMPERTURE -4-15 1 35 6 85 TEMPERTURE ( ) MX591 toc19 IOUT (m) 6 59 58 57 56 55 54 53 MX5917 I OUT vs. TEMPERTURE -4-15 1 35 6 85 TEMPERTURE ( ) MX591 toc2 IOUT (m) 35 3 25 2 15 1 5 MX591 I OUT vs. ( - ).4.8 1.2 1.6 2. - (V) MX591 toc21 MX591/MX5917 5 4 MX5917 I OUT vs. ( - ) MX591 toc22 6 5 MX5917 I OUT vs. ( - ) MX591 toc23 IOUT (m) 3 2 IOUT (m) 4 3 2 1 1.4.8 1.2 1.6 2. - (V).4.8 1.2 1.6 2. - (V) 7
MX591/MX5917 MX591 PIN MX5917/ NME 1 2 FUNTION Pin Description Undervoltage Lockout Input. Leave open circuit for the default setting of 26.5V. lternatively, can be connected to a resistivedivider to set a desired lockout voltage. See the hanging the Undervoltage Lockout Setting section. Voltage Input Terminal. ypass V 2 3 to with a.1µf capacitor to IN improve noise immunity. 3 1, 6, 8, 9, 15, 16 N.. No onnection. Not internally connected. 4 7 ENLE 5 1 3.3V Logic Input (TTL compatible), ctive-high. Turns the internal FET on or off. Drive ENLE high to enable. Drive ENLE low to disable. Open-Drain Logic Output, ctive-high. signals that the output is within specification. When the output is less than 7% of the input, the signal is pulled low. onnect a 1kΩ pullup resistor (R) to 3.3V. 6 11 IFULT Open-Drain Logic Output, ctive-low. IFULT is asserted when the output current falls below the IF TH nominal threshold or when the switch is off. onnect a 1kΩ pullup resistor (R) to 3.3V. 7 4, 5, 12, 13 Ground 8 14 Voltage Output Terminal Detailed Description The MX591/MX5917 are fully integrated hot-swap switches for positive power-supply rails. The devices allow safe insertion and removal of circuit cards into live backplanes or ports without causing glitches on the backplane power-supply rail. During startup these devices act as current regulators using their on-board FET to limit the amount of current drawn by the load to 28m for MX591, 567m for MX5917, and 42m for MX5917. If the required load current exceeds that current limit, the internal switch behaves like a constant current source. The MX591/MX5917 monitor the input voltage, the output voltage, the output current, and the die temperature. They assert IFULT and accordingly if they detect an error condition. zero-current load detection feature activates if the load current drops below IF TH for over 12ms. The MX591/MX5917 also include an ENLE input allowing the host system to turn the FET on or off. Normal Operation Startup When power is first applied with ENLE high, or when ENLE is asserted, the MX591/MX5917/ MX5917 limit the current to the load to 28m/ 567m/42m. is asserted high 12ms after the output voltage exceeds the power-good threshold. is pulled low if is less than 7%. Zero-urrent Load Fault zero-current load detection feature activates if the load current drops below IF TH for more than 12ms. The MX591/MX5917 flag the zero-current condition but do not disconnect the load. IFULT is deasserted whenever the load current exceeds the IF TH + IF HYS zero-current detection threshold. Undervoltage Lockout Fault If, where is the desired voltage at which the fault occurs, the internal FET is turned off and IFULT and are pulled low. The default voltage is 26.5V, but it can be adjusted using an external resistive-divider (see the hanging the Undervoltage Lockout Setting section). 8
Thermal Shutdown Fault The MX591/MX5917 monitor their internal die temperature. If the temperature of the die exceeds +14, the internal FET is turned off and IFULT and are pulled low. The output is enabled again only when the die temperature is below the thermal shutdown temperature by 3.5 typically. Power-Good () Power-good () logic output signals when the output has exceeded the threshold. When the output voltage is below 7% of the input voltage, is pulled low. When the output voltage is larger than 8% of the input voltage for more than 12ms, is asserted. pplications Information hoosing a Device The MX591 can output 28m, the MX5917 can output 42m, and the MX5917 can output up to 567m. In applications where high power is expected, use the MX5917 for its superior heat dissipation properties, and always solder all of its pins to a large section of circuit board copper. V MX591 OUT IFULT ENLE R N.. R +3.3V Figure 3. is Set Internally to its +26.5V Default Value V MX591 OUT.1µF IFULT MX591/MX5917 Logic ontrol The enable input (ENLE) responds to 3.3V logic signals and will force the internal FET off if ENLE is pulled low. This feature allows the host to disconnect the load from the power bus if required. Drive ENLE high to enable. hanging the Undervoltage Lockout Setting The undervoltage lockout () value defaults to 26.5V if the pin is left open circuit (Figure 3). onnect to to set the undervoltage lockout to a minimum of 7.5V (Figure 4). This lockout voltage can also be changed with a resistive-divider from to. The center node of the divider is connected to the pin (Figure 5). The values of R1 and R2 must satisfy the condition R1//R2 << 26kΩ and R2 << 1.65MΩ. R2 can be calculated as follows: R2 = R1 [(V / 7.5V) - 1] where () is the desired lockout voltage. ENLE N.. Figure 4. Minimum +7.5V onfiguration MX591.1µF R2 ENLE R1 N.. IFULT 1kΩ 1kΩ +3.3V 1kΩ 1kΩ +3.3V Figure 5. djusting with an External Resistive-Divider 9
MX591/MX5917 IN NDGP REFERENE OS. R UV1 R UV2 R SENSE 1.236V VREF HRGE PUMP THERML SHUTDOWN ON/OFF + 8V I REG PG ONTROL LOGI Functional Diagram OUT RPG1 R PG2 αvin IFULT R UV3 ENLE Pin onfigurations TOP VIEW 1 8 N.. 1 16 N.. N.. ENLE 2 3 4 MX591 7 6 5 IFULT 2 3 4 5 MX5917/ 15 14 13 12 N.. 8 SO N.. ENLE 6 7 11 1 IFULT N.. 8 9 N.. 16 SO 1
hip Information TRNSISTOR OUNT: 13 PROESS: SG3ISO Package Information SOIN.EPS MX591/MX5917 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 12 San Gabriel Drive, Sunnyvale, 9486 48-737-76 11 21 Maxim Integrated Products Printed US is a registered trademark of Maxim Integrated Products.