19-2262; Rev 0; 12/01 MAX5908 Evaluation Kit Features ♦ Input Voltage +5V, VIN1 (as configured) +1.8V, VIN2 (as configured) The EV kit is configured for +5V and +1.8V inputs. Both inputs are configured for up to 10A of output current. The MAX5908 controls two N-channel MOSFETs and provides current regulation during startup for both inputs. Several configurations allow the MAX5908 IC’s unique current-regulation architecture to be tailored to the application. The current-limiting and short-circuit protection features are configurable and demonstrate the various features of the MAX5908. The EV kit features several configurations for the startup timer setting, current limit, and output-voltage monitoring. The EV kit also provides power-on sequencing for the outputs. The EV kit can also be used to evaluate a MAX5906, MAX5907, or MAX5909 after replacing the MAX5908 with the desired IC. Additionally, the EV kit can be reconfigured to emulate a dual MAX5904 or MAX5905 hot-swap controller design. ♦ Configured to 10A Output Current Capability (both channels) ♦ Outputs Configured for +5V and +1.8V (configurable from +1.0V to +13.2V) ♦ 25mV Current-Limit Threshold (10A) ♦ Demonstrates Unique Current-Regulation Architecture ♦ Configurable Startup Timer ♦ Configurable Current Limits ♦ Configurable Output Over/Undervoltage Monitoring (both channels) ♦ Power-On Sequencing ♦ Evaluates MAX5906, MAX5907, MAX5909 (IC replacement required) ♦ Emulates MAX5904, MAX5905 ♦ Surface-Mount Components ♦ Fully Assembled and Tested Ordering Information Variable Speed/Bilevel is a trademark of Maxim Integrated Products, Inc. PART TEMP. RANGE MAX5908EVKIT 0°C to +70°C IC PACKAGE 16 QSOP Component List DESIGNATION C1, C2, C6 QTY 3 DESCRIPTION 0.1µF ±10%, 50V X7R ceramic capacitors (0805) Taiyo Yuden UMK212BJ104KG C3, C4 2 1000µF, 16V OS-CON capacitors (H case) Sanyo 16SA1000M C5 0 Not installed capacitor (H case) C7, C8 D1, D2 R1, R2 0 Not installed capacitors (0805) 2 3A, 30V Schottky diodes (M-flat) Toshiba CMS02 2 0.0025Ω ±5% 1W sense resistors (2512) Dale/Vishay WSL2512 0.0025Ω ±5% R86 DESIGNATION QTY R3, R4 2 20kΩ ±1% resistors (0805) DESCRIPTION R5 1 732kΩ ±1% resistor (0805) R6, R8, R10, R14 4 100kΩ ±1% resistors (0805) R7 1 200kΩ ±1% resistor (0805) R9 1 31.6kΩ ±1% resistor (0805) R11 1 4.02kΩ ±1% resistor (0805) R12 1 7.87kΩ ±1% resistor (0805) R13 1 124kΩ ±1% resistor (0805) R15 1 1kΩ ±5% resistor (0805) N1, N2 2 30V 100A N-channel MOSFETs (D2PAK) Fairchild FDB7030L ________________________________________________________________ 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 Evaluates: MAX5906–MAX5909 General Description The MAX5908 evaluation kit (EV kit) is a fully assembled and tested surface-mount, dual hot-swap controller circuit board that provides current-limiting and Variable Speed/Bilevel™ fault protection. The circuit uses a MAX5908 IC in a 16-pin QSOP package and is configurable for an input range of +1.0V to +13.2V. Evaluates: MAX5906–MAX5909 MAX5908 Evaluation Kit Component List (continued) DESIGNATION QTY DESCRIPTION SW1 1 SPST switch VIN1, PGND, VIN2, PGND, VOUT1, PGND, VOUT2, PGND 8 Uninsulated banana jacks JU1, JU2, JU6, JU7 4 3-pin headers JU3, JU4, JU5, JU8 4 2-pin headers 6) Connect a voltmeter to the VOUT1 and GND pads. 7) Turn on both power supplies and verify that the voltage at VOUT1 is +5V. 8) Verify that the voltage at VOUT2 is +1.8V. None 8 Shunt (JU1–JU5, JU6, JU7, JU8) U1 1 MAX5908EEE (QSOP-16) None 1 MAX5908 data sheet None 1 MAX5908 EV kit data sheet Quick Start The MAX5908 EV kit is fully assembled and tested. Follow these steps to verify board operation. Do not turn on the power supply until all connections are completed. MAX5908 Configuration: +5V and +1.8V, 10A Outputs 1) Verify that shunts are on pins 1 and 2 of jumpers JU1 (MON1) and JU2 (MON2). 2) Verify that shunts are on jumpers JU3 (LIM1, 10A) and JU4 (LIM2, 10A). 3) Verify that shunts are on pins 2 and 3 of jumpers JU6 and JU7 (TIM). 4) Verify that a shunt is not installed on jumpers JU5 (OUTC) and JU8 (ON). 5) Utilizing very short 10A rated banana leads (<6 inches long) connect the +5V and +1.8V DC power supplies to the VIN1 and VIN2 banana jacks, respectively. Utilizing very short 10A rated banana leads (<6 inches long) connect the supply grounds to the GND banana jacks. 9) Pressing push-button SW1 will disable both outputs. The output voltages V OUT1 and V OUT2 will drop when a load is connected to them. 10) Test points 1 and 2 (TP1, TP2) are provided to observe the MOSFET gate (N1, N2) voltage with an oscilloscope. Note: The banana leads connecting the power supply and the load to the EV kit must be very short (<6 inches long) and rated for at least 10A of current. Detailed Description The MAX5908 evaluation kit (EV kit) is a dual hot-swap controller circuit board configured for a +5V input (VIN1) and +1.8V input (VIN2). Both inputs have separate and independent current-limiting and Variable Speed/Bilevel fault protection. The EV kit uses a MAX5908 IC in a 16-pin QSOP package to control both sides of the circuit. The EV kit can be reconfigured for any input voltage between +1.0V to +13.2V. The MAX5908 IC controls the +5V side N-channel MOSFET (N1) and provides current regulation during startup. The current-limit threshold level is configured for 10A. It can be reconfigured to 12A by using jumper JU3. For other current-limit threshold levels, refer to the MAX5908 IC data sheet for instructions. The +5V outputvoltage monitoring can be disabled by jumper JU1. PC board pads are provided for an external capacitor (C7) to increase the MOSFET (N1) gate turn-on time. Test point TP1 can be used with an oscilloscope to view the gate voltage. The MAX5908 IC controls the +1.8V side N-channel MOSFET (N2) and provides current regulation during startup. The current-limit threshold level is configured for 10A. It can be reconfigured to 12A by using jumper JU4. The +1.8V output-voltage monitoring can be dis- Component Suppliers PHONE FAX WEBSITE Dale/Vishay SUPPLIER 402-564-3131 402-563-6296 www.vishay.com Fairchild 888-522-5372 — www.fairchildsemi.com Sanyo USA 619-661-6322 619-661-1055 www.sanyovideo.com Taiyo Yuden 800-348-2496 847-925-0899 www.t-yuden.com Toshiba 949-455-2000 949-859-3963 www.toshiba.com Note: Please indicate that you are using the MAX5908 when contacting these component suppliers. 2 _______________________________________________________________________________________ MAX5908 Evaluation Kit Three configurable startup timer settings (JU7) and a power-on delay capacitor (C6, JU8) provide several choices for evaluating different hot-swap designs. The MAX5908’s open-drain PGOOD pin signal is provided at the PGOOD pad on the EV kit. To evaluate a MAX5906, MAX5907, or MAX5909, order the desired IC from Maxim’s samples department and replace the MAX5908 with the desired IC. The EV kit can also be reconfigured to emulate a dual MAX5904 or MAX5905 hot-swap controller. Jumper Selection Several jumper selections in the following tables display the functions provided by the MAX5908 EV kit. +5V Output-Voltage Monitoring (VOUT1) The MAX5908 EV kit features an overvoltage and undervoltage monitor circuit for the +5V output. If the +5V output voltage is ≥+25% (+6.25V) or ≤-10% (+4.5V), the MAX5908 will pull the PGOOD pin low. When a MAX5906 or MAX5907 IC is installed, MOSFETs N1 and N2 will also be turned off by the circuit. Jumper JU1 is provided to disable this feature. Table 1 lists the various jumper options. Table 2. Jumper JU2 Functions SHUNT LOCATION MON2 PIN 1 and 2 Connected to VIN2 Disable VOUT2 output-voltage monitoring function 2 and 3 Connected to VOUT2 via R7 Enable VOUT2 output-voltage monitoring +5V Slow-Comparator Current Limit (VOUT1) The MAX5908 EV kit features a 2-pin jumper (JU3) to change the slow-comparator current-limit threshold level for the +5V output. Table 3 lists the jumper options. Table 3. Jumper JU3 Functions SHUNT LOCATION Installed None LIM1 PIN MON1 PIN MONITORING PGOOD 1 and 2 Connected to VIN1 Disable VOUT1 output-voltage monitoring function 2 and 3 Connected to VOUT1 via R5 Enable VOUT1 output-voltage monitoring +1.8V Output-Voltage Monitoring (VOUT2) The MAX5908 EV kit features an overvoltage and undervoltage monitor circuit for the +1.8V output. If the +1.8V output voltage is ≥+25% (+2.25V) or ≤-10% (+1.62V), the MAX5908 will pull the PGOOD pin low. When a MAX5906 or MAX5907 IC is installed, MOSFETs N1 and N2 will also be turned off by the circuit. Jumper JU2 is provided to disable this feature. Table 2 lists the various jumper options. EV KIT MODE Connected to GND VOUT1 slowcomparator current limit set to 25mV (10A trip) Connected to R3 VOUT1 slowcomparator current limit set to 30mV (12A trip) Table 1. Jumper JU1 Functions SHUNT LOCATION MONITORING PGOOD +1.8V Slow-Comparator Current Limit (VOUT2) The MAX5908 EV kit features a 2-pin jumper (JU4) to change the slow-comparator current-limit threshold level for the +1.8V output. Table 4 lists the jumper options. Table 4. Jumper JU4 Functions SHUNT LOCATION Installed None LIM2 PIN EV KIT MODE Connected to GND VOUT2 slowcomparator current limit set to 25mV (10A trip) Connected to R4 VOUT2 slowcomparator current limit set to 30mV (12A trip) _______________________________________________________________________________________ 3 Evaluates: MAX5906–MAX5909 abled by jumper JU2. PC board pads are provided for an external capacitor (C8) to increase the MOSFET (N2) gate turn-on time. Test point TP2 can be used with an oscilloscope to view the gate voltage. The MAX5908 uncommitted comparator (JU5, JU6) can be reconfigured for other uses. Evaluates: MAX5906–MAX5909 MAX5908 Evaluation Kit Comparator Output Configuration The MAX5908 EV kit features a 2-pin jumper (JU5) to reconfigure the MAX5908’s uncommitted comparator output (OUTC) destination. Table 5 lists the jumper options. Table 5. Jumper JU5 Functions SHUNT LOCATION None JU6 LOCATION OUTC PIN EV KIT MODE Comparator set for external use, Connected to See Table 6 OUTC pad only open-drain output Installed 2 and 3 Connected to ON pin and OUTC pad MAX5908 OFF until VIN2 > 1.62V Comparator Input Configuration The MAX5908 EV kit features a 3-pin jumper to reconfigure the MAX5908’s uncommitted comparator input (INC+) source. Jumper JU6 is used to select the source for the resistor-divider (R9, R10) feeding the comparator or the MAX5908 INC+ pin. Table 6 lists the selectable jumper options. Table 6. Jumper JU6 Functions SHUNT LOCATION INC+ PIN, R9, R10 COMPARATOR MODE 1 and 2 R_DIV pad supplies voltage Monitor R_DIV voltage 2 and 3 VIN2 supplies voltage Monitor VIN2 voltage INC+ pad supplies voltage, remove resistor R10 Monitor INC+ pad voltage None Startup Timer Setting The MAX5908 EV kit features several choices for setting the time required to completely turn on the MOSFETs (N1, N2). Jumper JU7 selects the time and Table 7 lists the selectable jumper options to reconfigure the startup timer setting. Table 7. Jumper JU7 Functions SHUNT LOCATION TIM PIN 1 and 2 TIM connected to R11 400µs startup timer setting 2 and 3 TIM connected to R12 800µs startup timer setting TIM floating 9ms startup timer setting None 4 ON Pin Delay During Power-Up (VIN1) The MAX5908 EV kit features a jumper to facilitate power-up sequencing. The jumper sets the response of the MAX5908 ON pin when applying power to the VIN1 input during power-up. Jumper JU8 selects the powerup sequencing mode for the EV kit. Table 8 lists the selectable jumper options. EV KIT MODE Table 8. Jumper JU8 Functions SHUNT LOCATION None Installed ON PIN, R13, R14 EV KIT MODE C6 floating No power-up sequencing: outputs turn on at the same time Connected to C6, enable power-up sequencing Power-up sequencing: after applying power, VOUT1 turns on 2.5ms later, VOUT2 turns on 13.5ms later Control Modes and Other Input Voltages Fault Resetting The MAX5908 EV kit features a push-button switch (SW1) to allow momentary toggling of the ON pin of the MAX5908. The switch will disable the EV kit outputs or unlatches faults when a MAX5907 or MAX5909 IC has been installed on the EV kit. An external controller can be utilized to control the ON pin of the MAX5908 EV kit. Refer to the MAX5904–MAX5909 data sheet for additional functions of the ON pin when toggling or applying a voltage to it. MOSFET Gate Control The MAX5908 EV kit features an option to increase the MOSFET gate (N1, N2) turn-on time. PC board pads are provided for installing a capacitor (C7, C8) to the respective gate-drive pins. Refer to the MAX5904–MAX5909 data sheet for information on selecting the value of the capacitors. Test points TP1 and TP2 are provided to observe the gate-drive voltage with an oscilloscope. Evaluating Other Input Voltages (+1V to +13.2V) The MAX5908 EV kit can evaluate other dual hot-swap controller configuration voltages operating from +1V up to +13.2V. One of the input voltages must be ≥+2.7V. To evaluate a lower current limit, resistors R3 or R4 must be replaced with a resistor selected for the desired current limit. The output-voltage monitoring resistors (R5, R6 or R7, R8) must also be replaced to provide +0.6V at the _______________________________________________________________________________________ MAX5908 Evaluation Kit Evaluating MAX5906–MAX5909 and MAX5904/MAX5905 Emulation Evaluating MAX5906–MAX5909 Dual Hot-Swap Designs The MAX5908 EV kit can evaluate a MAX5906, MAX5907, or MAX5909 dual hot-swap controller circuit design. The MAX5908 must be removed and replaced by the desired IC below. It can be ordered from the phone number listed at the end of the data sheet. Use Table 9 and Tables 1 through 8 to reconfigure the EV kit for the desired functions. Table 9. MAX5906–MAX5909 Features PART OUTPUT UNDERVOLTAGE FAULT AND OVERVOLTAGE MANAGEMENT PROTECTION/MONITORING MAX5906EEE MAX5907EEE MAX5908EEE MAX5909EEE Protection Protection Monitoring Monitoring Auto-Retry Latched Auto-Retry Latched Emulating MAX5904 or MAX5905 Dual Hot-Swap Designs The MAX5908 EV kit can emulate the MAX5904 and MAX5905 IC features. The EV kit uses a MAX5908 IC and properly set jumpers to emulate a MAX5904 design. Consult Tables 10 to emulate a MAX5904 design. Consult the MAX5904–MAX5909 data sheet for a description of specific pin functions on a MAX5904 IC and it’s associated external components. To emulate a MAX5905 design, replace the MAX5908 IC with a MAX5907 or MAX5909 IC. Table 10. Emulating MAX5904/MAX5905 Design (Set Shunt Location per Table) JUMPER SHUNT LOCATION MAX5908 PIN MAX5904/5905 EV KIT MODE EMULATED JU1 1 and 2 MON1 Disable monitoring output voltage VOUT1, not available on MAX5904/MAX5905 JU2 1 and 2 MON2 Disable monitoring output voltage VOUT2, not available on MAX5904/MAX5905 JU3 Installed LIM1 VOUT1 slow-comparator current limit set to 25mV (10A trip), fixed at 25mV on MAX5904/MAX5905 JU4 Installed LIM2 VOUT2 slow-comparator current limit set to 25mV (10A trip), fixed at 25mV on MAX5904/MAX5905 JU5 None OUTC Comparator not available on MAX5904/MAX5905 JU6 1 and 2 INC+ Comparator not available on MAX5904/MAX5905 JU7 None TIM 9ms startup timer setting _______________________________________________________________________________________ 5 Evaluates: MAX5906–MAX5909 MON1 or MON2 pin at nominal output voltages, respectively. Refer to the MAX5904–MAX5909 data sheet for information on selecting other current-sense resistors (R1 or R2) and other components. Evaluates: MAX5906–MAX5909 MAX5908 Evaluation Kit VIN1 ON VIN1 R15 1kΩ VIN1 SW1 R13 124kΩ 1% PGND ON PGND JU8 R14 100kΩ 1% C6 0.1µF 11 VIN2 VIN1 ON VIN2 14 C2 0.1µF VIN2 IN2 IN1 U1 R2 0.0025Ω 3 R1 0.0025Ω MAX5908 13 SENSE1 SENSE2 C1 0.1µF PGOOD PGOOD 4 PGND VOUT2 N2 PGND 3 VOUT2 1 12 D2 PGND JU4 N1 C7 OPEN PGOOD LIM2 1 VOUT1 3 C3 1000µF 16V C5 OPEN PGOOD R4 20kΩ 1% PGND 2 1 5 C8 OPEN ON JU5 7 JU3 16 R3 20kΩ 1% INC+ TIM R8 100kΩ 1% 2 3 OUTC LIM1 2 1 GATE1 GATE2 10 C4 1000µF 16V VOUT1 TP1 TP2 2 INC+ GND 6 MON2 9 MON1 8 OUTC PGND JU6 R9 31.6kΩ 1% 1 2 3 VIN2 GND R10 100kΩ 1% JU7 R11 4.02kΩ 1% R12 7.87kΩ 1% VIN2 VIN1 JU1 JU2 3 2 1 1 2 3 R7 200kΩ 1% VOUT2 R5 732kΩ 1% VOUT1 Figure 1. MAX5908 EV Kit Schematic 6 PGND R_DIV 15 R6 100kΩ 1% D1 _______________________________________________________________________________________ MAX5908 Evaluation Kit 1.0" Figure 2. MAX5908 EV Kit Component Placement Guide— Component Side Figure 3. MAX5908 EV Kit PC Board Layout—Component Side 1.0" Figure 4. MAX5908 EV Kit PC Board Layout—Solder Side 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 _____________________ 7 © 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. Evaluates: MAX5906–MAX5909 1.0"