19-1706; Rev 0; 7/01 +65V Simple Swapper Hot-Swap Switches The MAX5910/MAX5917 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 IFAULT output. The MAX5910/MAX5917 operate over a +10V 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 280mA for the MAX5910, 567mA for the MAX5917A, and 420mA for the MAX5917B. After startup, the FET is fully enhanced to reduce its on-resistance. To ensure robust operation, the MAX5910/MAX5917 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 MAX5910/MAX5917 Simple Swapper™ hot-swap ICs monitor four parameters for fault conditions: undervoltage lockout (UVLO), power-not-good, zero-current detection, and thermal shutdown. These devices are available in the extended temperature range, -40°C to +85°C. The MAX5910 comes in an 8-pin SO package and the MAX5917A/B is available in a 16-pin SO package. Applications Features ♦ Provides Safe Hot Swap for +10V to +65V Power Supplies ♦ IEEE 802.3af Compliant (MAX5917A) ♦ Startup into 500µF Load (MAX5917A) ♦ 280mA Current Limit for MAX5910 ♦ 567mA Current Limit for MAX5917A ♦ 420mA Current Limit for MAX5917B ♦ Zero-Current Load Detection ♦ Integrated 2.2Ω Power FET ♦ Status Output Reports Fault Conditions ♦ Internal Switch-Protection Circuitry ♦ Built-In Thermal Shutdown Ordering Information PART TEMP. RANGE MAX5910ESA -40°C to +85°C 8 SO MAX5917AESE* -40°C to +85°C 16 SO MAX5917BESE -40°C to +85°C 16 SO *Future product—contact factory for availability. IP Phones Power-Over-LAN Power-Over-MDI Remote Power Distribution Network Routers Network Switches Internet Appliances PIN-PACKAGE Typical Operating Circuit VIN (+42V) VIN UVLO MAX5910 MAX5917 VOUT 10kΩ PGOOD ON +3.3V IFAULT 10kΩ ENABLE OFF L O A D GND Pin Configurations appear at end of data sheet. Simple Swapper is a trademark of Maxim Integrated Products, Inc. ________________________________________________________________ Maxim Integrated Products 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. 1 MAX5910/MAX5917 General Description MAX5910/MAX5917 +65V Simple Swapper Hot-Swap Switches ABSOLUTE MAXIMUM RATINGS VIN, VOUT to GND................................................-0.3V to +70.0V ENABLE to GND..................................................-0.3V to +12.0V PGOOD, IFAULT to GND ....................................-0.3V to +12.0V UVLO to GND ..............................................-0.3V to (VIN + 0.3V) PGOOD, IFAULT Sink Current ............................................10mA Continuous Power Dissipation (TA = +70°C) 8-Pin SO (derate 5.9mW/°C above +70°C)..................470mW 16-Pin SO (derate 12.9mW/°C above +70°C)............1039mW Operating Temperature Range ...........................-40°C to +85°C Maximum Junction Temperature .....................................+150°C Storage Temperature Range .............................-60°C to +150°C Lead Temperature (soldering 10s) ..................................+300°C Stresses beyond those 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 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. ELECTRICAL CHARACTERISTICS (VIN = +42V, GND = 0, UVLO = open circuit, VENABLE = +3.3V, and TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL Input Voltage Range VIN Supply Current IIN Output Current Limit Continuous Operating Output Current DMOS On-Resistance ILIM IOUT RDS(ON) ENABLE Voltage Logic Low VLOW ENABLE Voltage Logic High VHIGH CONDITIONS MIN TYP 10 VIN = 10V to 65V (Note 1) VOUT = VIN - 5V, VIN = 10V to 65V (Note 2) MAX UNITS 65 V mA 1.2 2.5 MAX5910 250 280 310 MAX5917A 510 567 623 MAX5917B 370 420 470 MAX5910 240 MAX5917A 400 MAX5917B 350 VIN = 10V to 65V, MAX5910, IOUT = 200mA MAX5917A, IOUT = 400mA MAX5917B, IOUT = 300mA 2.2 mA 4 0.8 2.4 mA Ω V V ENABLE High Input Current IIH VENABLE = +5V 1 µA IFAULT Output Leakage Current IOH IFAULT = 10V, IOH > (IFTH + IFHYS) 1 µA PGOOD = 10V, VOUT > VPG 1 µA ENABLE = 0, VIN = +65V 1 µA 0.4 V 85 % PGOOD Output Leakage Current ILPGOOD VIN to VOUT Leakage Current ILIN/OUT PGOOD/IFAULT Output Logic Low VOL Sink current = 3mA PGOOD Threshold VPG Percentage of VIN, VOUT rising PGOOD Hysteresis PGHYS Zero-Current Detection Threshold 2 IFTH 71 Percentage of VIN Decreasing output current 78 10 MAX5910 MAX5917A MAX5917B 2 2 2 12 6 12 _______________________________________________________________________________________ % 25 10 25 mA +65V Simple Swapper Hot-Swap Switches (VIN = +42V, GND = 0, UVLO = open circuit, VENABLE = +3.3V, and TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL Zero-Current Detection Threshold Hysteresis IFHYS CONDITIONS MIN Percentage of IFTH TYP MAX 10 UNITS % IFAULT Output Delay tIFD (Figure 1) 7 12 17 ms PGOOD Output Delay tPGD (Figure 2) 7 12 17 ms Thermal Shutdown Temperature TJ Thermal Shutdown Hysteresis TJHYS Default Undervoltage Lockout VUVLO Undervoltage Lockout Hysteresis UVLOHYS Minimum Undervoltage Lockout Threshold Undervoltage Lockout Input Resistance VUVLO (MIN) RUVLO Die temperature increasing VIN decreasing 24.5 Percentage of VUVLO 140 o C 3.5 o C 26.5 28.5 11 UVLO connected to VIN, VIN decreasing 7 Force I = 5µA into UVLO pin 260 7.5 V % 8 V kΩ Note 1: Measured at GND pin at the end of the output voltage slew. Note 2: Guaranteed by RDSON test. Limited by package power dissipation. IOUT VPG IFTH VIN tPGD tIFD 3.3V 3.3V IFAULT 0 Figure 1. IFAULT Delay PGOOD 0 Figure 2. Power-Good Delay _______________________________________________________________________________________ 3 MAX5910/MAX5917 ELECTRICAL CHARACTERISTICS (continued) Typical Operating Characteristics (VIN = +42V, GND = 0, UVLO = open circuit, VENABLE = 3.3V, RL = 1.8kΩ, TA = +25°C, unless otherwise noted). SUPPLY CURRENT vs. TEMPERATURE 0.8 0.4 2.6 ON-RESISTANCE (Ω) 1.2 3.0 MAX5910 toc02 1.6 SUPPLY CURRENT (mA) 1.6 ON-RESISTANCE vs. TEMPERATURE 2.0 MAX5910 toc01 2.0 1.2 0.8 0.4 ILOAD = 150mA 0 30 40 50 60 1.0 -40 SUPPLY VOLTAGE (V) -15 10 60 85 -40 -15 10 MAX5910 toc06 A 0 B B B 0 0 C 0 0 C 0 C 0 2ms/div A: ENABLE, 5V/div B: VOUT, 20V/div C: PGOOD, 5V/div 4 2ms/div A: ENABLE, 5V/div B: VOUT, 20V/div C: PGOOD, 5V/div 60 MAX5910 TURN-ON WAVEFORMS (RL = 1.8kΩ, CL = 47µF) MAX5910 toc05 A 0 35 TEMPERATURE (°C) MAX5910 TURN-OFF WAVEFORMS (RL = 1.8kΩ, CL = 0) MAX5910 toc04 0 35 TEMPERATURE (°C) MAX5910 TURN-ON WAVEFORMS (RL = 1.8kΩ, CL = 0) A 1.8 NO LOAD 0 20 2.2 1.4 NO LOAD 10 MAX5910 toc03 SUPPLY CURRENT vs. SUPPLY VOLTAGE SUPPLY CURRENT (mA) MAX5910/MAX5917 +65V Simple Swapper Hot-Swap Switches 2ms/div A: ENABLE, 5V/div B: VOUT, 20V/div C: PGOOD, 5V/div _______________________________________________________________________________________ 85 +65V Simple Swapper Hot-Swap Switches MAX5910 TURN-OFF WAVEFORMS (RL = 1.8kΩ, CL = 47µF) MAX5910 OVER-CURRENT RESPONSE MAX5910 ZERO-CURRENT RESPONSE MAX5910 toc07 MAX5910 toc09 MAX5910 toc08 A A 0 A 0 0 B B 0 B C 0 0 C 0 0 C 0 20ms/div 40ms/div 2ms/div A: ENABLE, 5V/div B: VOUT, 20V/div C: PGOOD, 5V/div A: IOUT, 200mA/div B: IFAULT, 5V/div C: VOUT, 20V/div (SHORTED TO GND) A: IOUT, 100mA/div B: IFAULT, 5V/div C: VOUT, 20V/div MAX5917B TURN-ON WAVEFORMS (RL = 1.8kΩ, CL = 0) MAX5917B TURN-OFF WAVEFORMS (RL = 1.8kΩ, CL = 0) MAX5910 toc10 A MAX5917B TURN-ON WAVEFORMS (RL = 1Ω, CL = 47µF) MAX5910 toc11 MAX5910 toc12 A 0 A 0 B B B 0 0 0 C 0 C 0 C 0 0 2ms/div A: ENABLE, 5V/div B: VOUT, 20V/div C: PGOOD, 5V/div 2ms/div A: ENABLE, 5V/div B: VOUT, 20V/div C: PGOOD, 5V/div 2ms/div A: ENABLE, 5V/div B: VOUT, 20V/div C: PGOOD, 5V/div _______________________________________________________________________________________ 5 MAX5910/MAX5917 Typical Operating Characteristics (continued) (VIN = +42V, GND = 0, UVLO = open circuit, VENABLE = 3.3V, RL = 1.8kΩ, TA = +25°C, unless otherwise noted). Typical Operating Characteristics (continued) (VIN = +42V, GND = 0, UVLO = open circuit, VENABLE = 3.3V, RL = 1.8kΩ, TA = +25°C, unless otherwise noted). MAX5917B TURN-OFF WAVEFORMS (RL = 1.8kΩ, CL = 47µF) MAX5910 toc13 A MAX5917B TURN-OFF WAVEFORMS (RL = 300Ω, CL = 500µF) MAX5917B TURN-ON WAVEFORMS (RL = 300Ω, CL = 500µF) MAX5910 toc15 MAX5910 toc14 A 0 0 A 0 B B B 0 0 0 C 0 C 0 C 0 20ms/div 100ms/div 10ms/div A: ENABLE, 5V/div B: VOUT, 20V/div C: PGOOD, 5V/div A: ENABLE, 5V/div B: VOUT, 20V/div C: PGOOD, 5V/div A: ENABLE, 5V/div B: VOUT, 20V/div C: PGOOD, 5V/div MAX5917B ZERO-CURRENT RESPONSE MAX5917B OVER-CURRENT RESPONSE MAX5910 IOUT vs. TEMPERATURE MAX5910 toc17 300 MAX5910 toc18 MAX5910 toc16 A A 290 0 0 B 0 B C 0 0 C 0 2ms/div A: IOUT, 100mA/div B: IFAULT, 5V/div C: VOUT, 20V/div 6 IOUT (mA) MAX5910/MAX5917 +65V Simple Swapper Hot-Swap Switches 280 270 260 250 40ms/div A: IOUT, 200mA/div B: IFAULT, 5V/div C: VOUT, 20V/div (SHORTED TO GND) -40 -15 10 35 TEMPERATURE (°C) _______________________________________________________________________________________ 60 85 +65V Simple Swapper Hot-Swap Switches 590 300 250 370 IOUT (mA) IOUT (mA) 390 570 560 -15 10 35 60 150 100 540 50 0 -40 85 -15 10 35 60 0 85 0.4 1.6 2.0 600 MAX5910 toc23 400 1.2 MAX5917A IOUT vs. (VIN - VOUT) MAX5917B IOUT vs. (VIN - VOUT) 500 0.8 VIN - VOUT (V) TEMPERATURE (°C) TEMPERATURE (°C) MAX5910 toc22 500 400 300 IOUT (mA) -40 200 550 530 350 IOUT (mA) IOUT (mA) 580 410 MAX5910 toc21 350 MAX5910 toc20 600 MAX5910 toc19 430 MAX5910 IOUT vs. (VIN - VOUT) MAX5917A IOUT vs. TEMPERATURE MAX5917B IOUT vs. TEMPERATURE 450 300 200 200 100 100 0 0 0 0.4 0.8 1.2 VIN - VOUT (V) 1.6 2.0 0 0.4 0.8 1.2 1.6 2.0 VIN - VOUT (V) _______________________________________________________________________________________ 7 MAX5910/MAX5917 Typical Operating Characteristics (continued) (VIN = +42V, GND = 0, UVLO = open circuit, VENABLE = 3.3V, RL = 1.8kΩ, TA = +25°C, unless otherwise noted). MAX5910/MAX5917 +65V Simple Swapper Hot-Swap Switches Pin Description PIN MAX5910 MAX5917A/B NAME FUNCTION 1 2 UVLO Undervoltage Lockout Input. Leave UVLO open circuit for the default setting of 26.5V. Alternatively, UVLO can be connected to a resistivedivider to set a desired lockout voltage. See the Changing the Undervoltage Lockout Setting section. 2 3 VIN Voltage Input Terminal. Bypass VIN to GND with a 0.1µF capacitor to improve noise immunity. 3 1, 6, 8, 9, 15, 16 N.C. No Connection. Not internally connected. 4 7 ENABLE 3.3V Logic Input (TTL compatible), Active-High. Turns the internal FET on or off. Drive ENABLE high to enable VOUT. Drive ENABLE low to disable VOUT. 5 10 PGOOD Open-Drain Logic Output, Active-High. PGOOD signals that the output is within specification. When the output is less than 70% of the input, the PGOOD signal is pulled low. Connect a 10kΩ pullup resistor (R) to 3.3V. 6 11 IFAULT Open-Drain Logic Output, Active-Low. IFAULT is asserted when the output current falls below the IFTH nominal threshold or when the switch is off. Connect a 10kΩ pullup resistor (R) to 3.3V. 7 4, 5, 12, 13 GND Ground 8 14 VOUT Voltage Output Terminal Detailed Description The MAX5910/MAX5917 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 280mA for MAX5910, 567mA for MAX5917A, and 420mA for MAX5917B. If the required load current exceeds that current limit, the internal switch behaves like a constant current source. The MAX5910/MAX5917 monitor the input voltage, the output voltage, the output current, and the die temperature. They assert IFAULT and PGOOD accordingly if they detect an error condition. A zero-current load detection feature activates if the load current drops below IF TH for over 12ms. The MAX5910/MAX5917 also include an ENABLE input allowing the host system to turn the FET on or off. 8 Normal Operation Startup When power is first applied with ENABLE high, or when ENABLE is asserted, the MAX5910/MAX5917A/ MAX5917B limit the current to the load to 280mA/ 567mA/420mA. PGOOD is asserted high 12ms after the output voltage exceeds the power-good threshold. PGOOD is pulled low if VOUT is less than 70% VIN. Zero-Current Load Fault A zero-current load detection feature activates if the load current drops below IFTH for more than 12ms. The MAX5910/MAX5917 flag the zero-current condition but do not disconnect the load. IFAULT is deasserted whenever the load current exceeds the IFTH + IFHYS zero-current detection threshold. Undervoltage Lockout Fault If VIN ≤ UVLO, where UVLO is the desired voltage at which the UVLO fault occurs, the internal FET is turned off and IFAULT and PGOOD are pulled low. The default UVLO voltage is 26.5V, but it can be adjusted using an external resistive-divider (see the Changing the Undervoltage Lockout Setting section). _______________________________________________________________________________________ +65V Simple Swapper Hot-Swap Switches VIN Power-good (PGOOD) logic output signals when the output has exceeded the PGOOD threshold. When the output voltage is below 70% of the input voltage, PGOOD is pulled low. When the output voltage is larger than 80% of the input voltage for more than 12ms, PGOOD is asserted. Applications Information VOUT VIN Power-Good (PGOOD) MAX5910/MAX5917 Thermal Shutdown Fault The MAX5910/MAX5917 monitor their internal die temperature. If the temperature of the die exceeds +140°C, the internal FET is turned off and IFAULT and PGOOD are pulled low. The output is enabled again only when the die temperature is below the thermal shutdown temperature by 3.5°C typically. VOUT MAX5910 UVLO IFAULT ENABLE PGOOD GND N.C. R R +3.3V Figure 3. UVLO is Set Internally to its +26.5V Default Value Choosing a Device The MAX5910 can output 280mA, the MAX5917B can output 420mA, and the MAX5917A can output up to 567mA. In applications where high power is expected, use the MAX5917 for its superior heat dissipation properties, and always solder all of its GND pins to a large section of circuit board copper. VIN Logic Control The undervoltage lockout (UVLO) value defaults to 26.5V if the UVLO pin is left open circuit (Figure 3). Connect UVLO to VIN 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 VIN to GND. The center node of the divider is connected to the UVLO pin (Figure 5). The values of R1 and R2 must satisfy the condition R1//R2 << 260kΩ and R2 << 1.65MΩ. R2 can be calculated as follows: R2 = R1 ✕ [(VUVLO / 7.5V) - 1] where VIN (UVLO) is the desired lockout voltage. VOUT MAX5910 0.1µF The enable input (ENABLE) responds to 3.3V logic signals and will force the internal FET off if ENABLE is pulled low. This feature allows the host to disconnect the load from the power bus if required. Drive ENABLE high to enable VOUT. Changing the Undervoltage Lockout Setting VOUT VIN UVLO IFAULT ENABLE PGOOD GND N.C. 10kΩ 10kΩ +3.3V Figure 4. Minimum +7.5V UVLO Configuration VIN VIN 0.1µF R2 VOUT MAX5910 VOUT UVLO IFAULT ENABLE PGOOD R1 N.C. GND 10kΩ 10kΩ +3.3V Figure 5. Adjusting UVLO with an External Resistive-Divider _______________________________________________________________________________________ 9 +65V Simple Swapper Hot-Swap Switches MAX5910/MAX5917 Functional Diagram VIN + 8V CHARGE PUMP RSENSE IN OUT OSC. IREG RPG1 VREF ON/OFF BANDGAP REFERENCE PG RUV1 RPG2 THERMAL SHUTDOWN 1.236V αVIN GND UVLO RUV2 IFAULT CONTROL LOGIC GND PGOOD RUV3 GND UVLO ENABLE Pin Configurations TOP VIEW UVLO 1 VIN 2 N.C. 8 VOUT 7 GND MAX5910 3 6 IFAULT ENABLE 4 5 PGOOD N.C. 1 16 N.C. UVLO 2 15 N.C. VIN 3 14 VOUT GND 4 8 SO MAX5917A/B 13 GND GND 5 12 GND N.C. 6 11 IFAULT ENABLE 7 10 PGOOD 9 N.C. 8 N.C. 16 SO 10 ______________________________________________________________________________________ +65V Simple Swapper Hot-Swap Switches SOICN.EPS Package Information 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, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11 © 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. MAX5910/MAX5917 Chip Information TRANSISTOR COUNT: 1003 PROCESS: SG3ISO