19-2378; Rev 0; 4/02 MAX5915 Evaluation Kit Features ♦ Demonstrates PCI 2.2 Dual Hot-Swap Design (3.3V/5V PCI Card Designs) ♦ Independent Output Controls Provide for Each Channel +3.3V and Up to 7.6A (Adjustable) +5V and Up to 5A (Adjustable) +12V and Up to 0.5A -12V and Up to 0.1A +3.3V AUX and Up to 0.375A ♦ Evaluates Hot Swapping 3.3V/64-Bit and 5V/64-Bit PCI Line Cards ♦ Demonstrates Overcurrent Protection with Status Report ♦ Monitors Output Undervoltage for +3.3V, +5V, ±12V, and +3.3V AUX with Status Report ♦ Independent 3.3V AUX Output with Separate ON/OFF Control ♦ Latched After-Fault Conditions (+3.3V, +5V, ±12V) The EV kit can also be configured to demonstrate a dual hot-swap design without using the PCI 3.3V/64-bit and 5V/64-bit PCI connectors. ♦ Power-On Reset and Fault Status Reporting ♦ Independent On/Off Controls for Channels A/B ♦ Surface-Mount Components ♦ Fully Assembled and Tested Ordering Information PART TEMP RANGE MAX5915EVKIT 0°C to +70°C IC PACKAGE 28 TSSOP Component List DESIGNATION QTY C1, C3, C5, C7, C9 5 0.1µF ±10%, 16V X7R ceramic capacitors (0603) Murata GRM188R71C104KA01 5 4.7µF ±20%, 16V X5R ceramic capacitors (1206) Taiyo Yuden EMK316BJ475ML C2, C4, C6, C8, C10 DESCRIPTION C11–C16 6 47µF ±20%, 16V tantalum capacitors (C case) AVX TPSC476M016R0350 C17–C20 4 470µF ±10%, 6.3V tantalum capacitors (X case) Kemet T510X477K006AS J1, J2 2 6-pin headers DESIGNATION QTY DESCRIPTION J3 1 PCI 5V/64-bit connector Amp 145166-4 J4 1 PCI 3.3V/64-bit connector Amp 145165-4 J5–J8 4 Uninsulated banana jacks JU1–JU10 10 2-pin headers N1–N4 4 30V, 13A N-channel MOSFETs (8-pin SO) Fairchild FDS6670A 4 0.005Ω ±1%, 0.25W sense resistors (1206) Dale-Vishay WSL1206 0.005Ω ±1% B43 R1–R4 ________________________________________________________________ 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: MAX5915 General Description The MAX5915 evaluation kit (EV kit) is a fully assembled and tested surface-mount dual hot-swap controller circuit board for two PCI 2.2 server line cards. The circuit uses a MAX5915 IC in a 28-pin TSSOP package. The EV kit provides independent power control for the +3.3V, +5V, ±12V, and +3.3V auxiliary outputs to the PCI 2.2 connectors (A/B channels). The EV kit demonstrates the MAX5915 IC’s overcurrent shutdown, output undervoltage monitoring, power-on reset (POR), and fault-reporting capabilities for channels A and B. The MAX5915 IC controls the two separate external Nchannel MOSFETs for the +5V and +3.3V outputs, respectively. The MAX5915 has internal MOSFETs that control the ±12V and +3.3V auxiliary outputs of both channels. Isolation switches are provided for both channels’ +3.3V and +3.3V auxiliary supplies and to enable/disable both channels independently. Evaluates: MAX5915 MAX5915 Evaluation Kit Component Suppliers SUPPLIER PHONE FAX WEBSITE AVX 843-946-0238 843-626-3123 www.avxcorp.com Dale/Vishay 402-564-3131 402-563-6296 www.vishay.com Fairchild 888-522-5372 — www.fairchildsemi.com Kemet 864-963-6300 864-963-6322 www.kemet.com Murata 770-436-1300 770-436-3030 www.murata.com Taiyo Yuden 800-348-2496 847-925-0899 www.t-yuden.com Note: Please indicate that you are using the MAX5915 when contacting these component suppliers. Component List (continued) DESIGNATION QTY DESCRIPTION R5–R11 7 10kΩ ±5% resistors (0805) SW1–SW4 4 SPST DIP switches SW5 1 SPDT slide switch SW6 1 DPDT toggle switch U1 1 MAX5915EUI (28-pin TSSOP) None 10 Shunts (JU1–JU10) None 1 MAX5915 data sheet None 1 MAX5915 EV kit data sheet None 6 Rubber bumpers Quick Start Required Equipment One each of the following DC power supplies is required: • +3.3V, 20A • +5V, 10A • +12V, 3A • -12V, 0.25A The +3.3V power supply can be used to power the main +3.3V and +3.3V_AUX inputs, which are independently switchable (SW5, SW6). The MAX5915 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. Note: The banana leads connecting the +3.3V and +5V power supplies to the EV kit must be very short (< 6in long). 2 MAX5915 Configuration A/B Channel Outputs 1) Verify that shunts are on jumpers JU1–JU5 (channel A). 2) Verify that shunts are on jumpers JU6–JU10 (channel B). 3) Set switches SW1 (ON_A) and SW2 (AUX_ONA) to the OFF position (channel A). 4) Set switches SW3 (ON_B) and SW4 (AUX_ONB) to the OFF position (channel B). 5) Set switches SW5 (+3.3VAUXIN) and SW6 (+3.3V) to the OFF position. 6) Utilizing very short 20A rated banana leads (< 6in long), connect the +3.3VDC power supply to the +3.3V_VIN banana jack. Utilizing very short 20Arated banana leads (< 6in long), connect the supply ground to the GND banana jack. 7) Utilizing very short 10A-rated banana leads (< 6in long), connect the +5VDC power supply to the +5V_VIN banana jack. Utilizing very short 10Arated banana leads (< 6in long), connect the supply ground to the GND banana jack. 8) Connect the +12VDC and -12VDC power supplies to the +12V_VIN and -12V_VIN pads, respectively. Connect the +12VDC and -12VDC power supplies to the respective GND pad on the EV kit. 9) Connect a voltmeter to the +3.3V_A and GND pads. 10) Turn on all the power supplies in any sequence. 11) Turn switches SW5 and SW6 to the ON position to provide power to the +3.3V_AUX inputs and main +3.3V inputs, respectively. 12) Sliding switches SW1 and SW2 to the ON position enables channel A on MAX5915 EV kit dual hotswap controller. _______________________________________________________________________________________ MAX5915 Evaluation Kit 14) Verify that the voltage at the following pads is as shown below: +3.3V_A, +3.3V_B = +3.3V +5V_A, +5V_B = +5V +12V_A, +12V_B = +12V -12V_A, -12V_B = -12V +3.3V_AUX_A, +3.3V_AUX_B = +3.3V Detailed Description The MAX5915 EV kit demonstrates a PCI 2.2 dual hotswap controller circuit design. Two PCI channels (A and B) are provided to evaluate 5V/64-bit and 3.3V/64bit line card designs independently. The EV kit can also be used to evaluate 32-bit PCI line cards. The EV kit uses a MAX5915 IC in a 28-pin TSSOP package to control output power and monitor faults. The MAX5915 IC controls each channel’s output power independently. External N-channel MOSFETs are used to control power to the +5V and +3.3V outputs of each channel. Current-sensing resistors are used for the +5V and +3.3V outputs of each channel. MOSFETs inside the MAX5915 IC control the ±12V and +3.3V auxiliary outputs of each channel. Switches to isolate the +3.3V (SW6) and +3.3V auxiliary (SW5) power-supply inputs are provided. Slide switches are also provided to enable/disable each channel’s main (SW1, SW3) and auxiliary (SW2, SW4) output independently. The enable/disable switches can provide a reset function for the respective channel, which latches off during a fault. If an overcurrent or undervoltage fault persists on either channel, the MAX5915 shuts down the respective channel. The fault is reported to the channel’s P_GOOD_X pad where X is A or B, which has the fault. The MAX5915’s open-drain FAULT_X pin pulls down the channel’s P_GOOD_X pad during a fault condition. A pad (V_PULL) is provided for the user to connect a power supply (5.5V max) to the pullup resistor and P_GOOD_X pad. The P_GOOD_X pad also provides POR status during power-up. The user can evaluate a 3.3V/64-bit and 5V/64-bit PCI line card simultaneously using the EV kit’s PCI 2.2 compliant connectors. The EV kit can also be reconfigured to demonstrate a dual hot-swap design without using the PCI 3.3V/64-bit and 5V/64-bit PCI connectors and using the on-board capacitors as a “capacitive” load. For evaluating external DC loads, the cables connecting the +3.3V and +5V outputs to the external DC load must be rated for at least 10A and be shorter than 12in long. Additionally, current-sense resistors R1–R4 are configured for the maximum allowable output current on the +3.3V and +5V outputs. The resistors can be reconfigured for lower output currents only. Switch and Jumper Selection Several switch and jumper selections in Tables 1–5 display the functions provided by the MAX5915 EV kit. Channel A Enable/Disable Switches The MAX5915 EV kit features switches to enable/disable the channel A main outputs and auxiliary +3.3V output. The switches can also be used to reset the EV kit’s respective output. Table 1 lists the various switch options. Channel B Enable/Disable Switches The MAX5915 EV kit features switches to enable/disable the channel B main outputs and auxiliary +3.3V output. The switches can also be used to reset the EV kit’s respective output. Table 2 lists the various switch options. +3.3V Supply Isolation Switches The MAX5915 EV kit features switches to isolate the +3.3V main supply (+3.3V) from the +3.3V auxiliary Table 1. Channel A Switch Functions SWITCH SWITCH STATE MAX5915 PIN CONNECTION MAX5915 OPERATION SW1 ON (closed) ON_A pin pulled high Enable channel A main outputs SW1 OFF (open) ON_A pin pulled low Disable channel A main outputs SW2 ON (closed) AUX_ONA pin pulled high Enable channel A +3.3V auxiliary outputs SW2 OFF (open) AUX_ONA pin pulled low Disable channel A +3.3V auxiliary outputs _______________________________________________________________________________________ 3 Evaluates: MAX5915 13) Sliding switches SW3 and SW4 to the ON position enables channel B on the MAX5915 EV kit dual hotswap controller. Evaluates: MAX5915 MAX5915 Evaluation Kit supply (+3.3VAUXIN) for both channels. Table 3 lists the various switch options. Channel A Capacitance Load (5V/64-Bit PCI Line Card) The MAX5915 EV kit features several jumpers to select what supplies the “capacitive” load for the controller to regulate during evaluation. A 5V/64-bit PCI line card plugged into the PCI +3.3V/64-bit connector (J3) or the EV kit’s capacitors can supply this load. Jumpers JU1–JU5 are provided to disable/enable this feature independent of the channel B selection. Table 4 lists the various jumper options. Channel B Capacitance Load (3.3V/64-Bit PCI Line Card) The MAX5915 EV kit features several jumpers to select what supplies the “capacitive” load for the controller to regulate during evaluation. A 3.3V/64-bit PCI line card plugged into the PCI 3.3V/64-bit connector (J4) or the EV kit’s capacitors can supply this load. Jumpers JU6–JU10 are provided to disable/enable this feature independent of the channel A selection. Table 5 lists the various jumper options. Table 2. Channel B Switch Functions SWITCH SWITCH STATE MAX5915 PIN CONNECTION SW3 ON (closed) MAX5915 OPERATION ON_B pin pulled high Enable channel B main outputs SW3 OFF (open) ON_B pin pulled low Disable channel B main outputs SW4 ON (closed) AUX_ONB pin pulled high Enable channel B +3.3V auxiliary outputs SW4 OFF (open) AUX_ONB pin pulled low Disable channel B +3.3V auxiliary outputs Table 3. +3.3V Switch Functions 4 SWITCH SWITCH STATE SW5 ON (closed) MAX5915 PIN CONNECTION +3.3VAUXIN Supply +3.3V to channel A/B auxiliary input MAX5915 OPERATION SW5 OFF (open) +3.3VAUXIN 0V at channel A/B auxiliary inputs SW6 ON (closed) Supply +3.3V to MOSFETs N2 and N4 Supply +3.3V to external MOSFETs SW6 OFF (open) Supply 0V to MOSFETs N2 and N4 Disconnect supply to external MOSFETs _______________________________________________________________________________________ MAX5915 Evaluation Kit Evaluates: MAX5915 Table 4. Channel A Jumpers JU1–JU5 Functions JU1 SHUNT LOCATION Installed PIN CONNECTION C11 connected to +3.3VAUXOA pin JU1 None +3.3VAUXOA pin floating JU2 Installed C12 connected to +12VOA pin JU2 None +12VOA pin floating JU3 Installed C13 connected to -12VOA pin JUMPER JU3 None -12VOA pin floating JU4 Installed C17 connected to +5V_A pad JU4 None +5V_A pad floating JU5 Installed C18 connected to +3.3V_A pad JU5 None +3.3_A pad floating MAX5915 OPERATION C11 provides capacitance +5V PCI card supplies capacitance C12 provides capacitance +5V PCI card supplies capacitance C13 provides capacitance +5V PCI card supplies capacitance C17 provides capacitance +5V PCI card supplies capacitance C18 provides capacitance +5V PCI card supplies capacitance Table 5. Channel B Jumpers JU6–JU10 Functions JUMPER SHUNT LOCATION PIN CONNECTION MAX5915 OPERATION JU6 Installed C14 connected to +3.3VAUXOB pin C14 provides capacitance +3.3V PCI card supplies capacitance JU6 None +3.3VAUXOB pin floating JU7 Installed C15 connected to +12VOB pin C15 provides capacitance JU7 None +12VOB pin floating +3.3V PCI card supplies capacitance JU8 Installed C16 connected to -12VOB pin C16 provides capacitance JU8 None -12VOB pin floating +3.3V PCI card supplies capacitance JU9 Installed C19 connected to +5V_B pad C19 provides capacitance JU9 None +5V_B pad floating +3.3V PCI card supplies capacitance JU10 Installed C20 connected to +3.3V_B pad C20 provides card capacitance JU10 None +3.3_B pad floating +3.3V PCI card supplies capacitance Control Modes Fault Resetting The MAX5915 EV kit features two slide switches to reset a fault for each channel. The switch resets the EV kit and unlatches faults when toggled from ON to OFF. See Table 1 for resetting channel A or Table 2 for channel B. Refer to the MAX5915 data sheet for additional functions of the ON_X pin. _______________________________________________________________________________________ 5 Evaluates: MAX5915 MAX5915 Evaluation Kit +5V_VIN J5 BANANA +5V_VIN C1 0.1µF C2 4.7µF GND J6 BANANA +5V_VIN SW1 +12_VIN 28 +12VIN C4 4.7µF GND C6 4.7µF C5 0.1µF -12_VIN SW5 +3.3V_VIN R6 10kΩ 13 3.3VAUXIN C8 4.7µF V_PULL R11 10kΩ 2 1 SW3 2 4 8 P_GOOD_A 6 P_GOOD_B 9 +3.3V_AUX_A JU1 1 J8 BANANA 2 J1-2 1 2 C14 47µF 16V GND J2-2 1 +12VOA JU2 JU6 MAX5915 +12V_A C12 47µF 16V P_GOOD_B +3.3V_AUX_B U1 C11 47µF 16V GND R10 10kΩ 3.3AUXOB 14 12 3.3VAUXOA C9 0.1µF V_PULL 2 J2-1 J1-1 C10 4.7µF SW4 1 AUX_ONB 11 R8 10kΩ P_GOOD_A 1 2 1 R7 10kΩ C7 0.1µF R9 10kΩ 3 5 GND SW2 3 1 +3.3V GND 2 1 ON_B 6 16 -12VIN 2 SW6 R5 10kΩ AUX_ONA 10 7 GND J7 BANANA 1 ON_A 5 C3 0.1µF +12V_B +12VOB 27 2 JU7 1 -12V_A 17 -12VOA JU3 1 GND +5V_VIN 1 8 7 5 6 N1 5 6 4 3 2 23 5VGATEA 21 5VOA 1 5 6 N2 5 6 4 2 3.3VGATEA J1-5 +3.3V_A 1 GND C18 470µF 6.3V 2 JU9 1 2 8 7 C19 470µF 6.3V GND 3 2 3.3VSENB 25 R2 0.005Ω 1% R4 0.005Ω 1% J2-5 +3.3V_B 3.3VOB 24 1 JU10 2 C20 470µF 6.3V Figure 1. MAX5915 EV Kit Schematic 6 J2-6 N4 4 1 4 3.3VOA JU5 3.3VGATEB 26 1 3 3.3VSENA +5V_B 5VOB 18 2 3 2 3 2 +3.3V 8 7 GND R3 0.005Ω J2-4 1% +3.3V C17 470µF 6.3V C16 47µF 16V 5VSENB 19 R1 0.005Ω 1% J1-4 2 GND N3 1 +5V_A J1-6 5VGATEB 20 JU8 8 7 4 1 22 5VSENA GND -12VOB 15 +5V_VIN JU4 C15 47µF 16V -12V_B 2 C13 47µF 16V 2 J2-3 J1-3 _______________________________________________________________________________________ GND MAX5915 Evaluation Kit Evaluates: MAX5915 +5V_A +5V_B J3-A5 J3-B3 J3-A14 +3.3V_AUX_A J4-A5 J4-B3 J4-A14 J3-B5 J3-A12 J3-B6 J3-B12 J3-A8 J3-A2 +12V_A J4-B5 J4-B15 J4-A2 +12V_B J3-B1 -12V_A J4-B6 J4-B17 J4-B1 -12V_B J3-A13 J4-A8 J4-A18 J3-A10 J3-B13 J4-A61 J4-B22 J3-A16 J3-B15 J4-B61 J4-A24 J3-A1 J9-2 TRST# J3-B19 J3-B17 J4-A62 J4-B28 J3-B9 J9-3 PRSNT1# J3-A59 J3-A18 J4-B62 J4-A30 J3-B11 J9-4 PRSNT2# J3-B59 J3-B22 J4-B34 J3-A15 J9-5 RST# J3-A61 J3-A24 J4-A35 J3-B37 J9-6 DEVSEL# J3-B61 J3-B28 J4-A10 J4-A37 J9-1 GND J3-A62 J3-A30 J4-A16 J4-B38 J3-B62 J3-B34 J4-B19 J4-A42 J3-A66 J3-A35 J4-A21 J4-B46 J4-A1 J10-2 TRST# J3-B70 J3-A37 J4-B25 J4-A48 J4-B9 J10-3 PRSNT1# J3-A75 J3-B38 J4-A27 J4-A50 J4-B11 J10-4 PRSNT2# J3-B79 J3-A42 J4-B31 J4-B50 J4-A15 J10-5 RST# J3-A64 J3-B46 J4-A33 J4-A51 J4-B37 J10-6 DEVSEL# J3-B88 J3-A48 J4-B36 J4-B51 J4-B49 J10-7 M66EN J3-B49 J4-A39 J4-A56 J10-1 GND +3.3V_A +3.3V_B J3-A56 J4-B41 J4-B57 J3-A21 J3-B57 J4-B43 J4-A63 J3-B25 J3-A63 J4-A45 J4-B64 J3-A27 J3-B64 J4-A53 J4-B67 J3-B31 J3-B67 J4-B54 J4-A69 J3-A33 J3-A69 J4-A59 J4-A72 J3-B36 J3-A72 J4-B59 J4-B73 J3-A39 J3-B73 J4-A66 J4-B76 J3-B41 J3-B76 J4-B70 J4-A78 J3-B43 J3-A78 J4-A75 J4-A81 J3-A45 J3-A81 J4-B79 J4-B82 J3-A53 J3-B82 J4-A84 J4-B85 J3-B54 J3-B83 J4-B88 J4-A87 J3-A87 J4-A90 J3-A90 J4-B91 J3-B91 J4-A93 J3-A93 J4-B94 +3.3V_AUX_B J3-B94 PCI 5V/64-BIT PCI 3.3V/64-BIT Figure 2. MAX5915 EV Kit Schematic, PCI Connectors _______________________________________________________________________________________ 7 Evaluates: MAX5915 MAX5915 Evaluation Kit Figure 3. MAX5915 EV Kit Component Placement Guide—Component Side Figure 4. MAX5915 EV Kit PC Board Layout—Component Side 8 _______________________________________________________________________________________ MAX5915 Evaluation Kit Evaluates: MAX5915 Figure 5. MAX5915 EV Kit PC Board Layout—Inner Layer, Ground Plane Figure 6. MAX5915 EV Kit PC Board Layout—Inner Layer, Power Plane _______________________________________________________________________________________ 9 Evaluates: MAX5915 MAX5915 Evaluation Kit Figure 7. MAX5915 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. 10 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.