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| 19-1944; Rev 0; 1/01 MAX4273 Evaluation Kit General Description The MAX4273 evaluation kit (EV kit) is a fully assembled and tested surface-mount hot-swap controller circuit board that provides current-limiting and DualSpeed/BiLevelTM fault protection. The circuit uses a MAX4273 IC in a 16-pin QSOP package and is configured for a +2.7V to +13.2V input voltage range. The MAX4273 controls the N-channel MOSFET and provides current regulation during startup. Several configurations allow the MAX4273 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 provided by the MAX4273 IC. The EV kit features a power-on reset (POR) circuit. Several configurations for autoretry, glitch filters, auxiliary VCC power, and gate drive speed are provided. The EV kit can also be reconfigured to emulate the MAX4271 and MAX4272 hot-swap controllers. o +2.7V to +13.2V Input Range o Output Configured for +5V (Configurable from +2.7V to +13.2V) o Up to 10A Capability (as Configured) o Demonstrates Unique Current-Regulation Architecture o Auxiliary VCC Feature o Power-On Reset Circuit o Configurable Autoretry o Adjustable N-Channel MOSFET Gate Charging Time o Configurable Glitch Filters o Also Emulates MAX4271 and MAX4272 Hot-Swap Controllers o Surface-Mount Components o Fully Assembled and Tested DualSpeed/BiLevel is a trademark of Maxim Integrated Products. Features Evaluates: MAX4273 Ordering Information PART MAX4273EVKIT TEMP. RANGE 0C to +70C IC PACKAGE 16 QSOP Component List DESIGNATION C1, C12 QTY 2 DESCRIPTION 1.0F, 16V X5R ceramic capacitors (0805) Taiyo Yuden EMK212BJ105KG 0.1F, 50V X7R ceramic capacitors (0805) Taiyo Yuden UMK212BJ104KG 3300pF, 50V ceramic capacitor (0603) Taiyo Yuden UMK107BJ332KZ 0.068F, 50V X7R ceramic capacitor (0805) Taiyo Yuden UMK212BJ683KG 1000F, 16V OS-CON capacitor (H case) Sanyo 16SA1000M DESIGNATION C7, C8 QTY 0 DESCRIPTION Not installed (F12 case) Sanyo 16SV220M recommended 0.22F, 35V X7R ceramic capacitor (0805) Taiyo Yuden GMK212BJ224KG 0.01F, 50V X7R ceramic capacitors (0603) Taiyo Yuden UMK107 B103KZ Not installed, (H case) Sanyo 16SA1000M recommended 330pF, 50V X7R ceramic capacitor (0603) Murata GRM39X7R331K050 C2, C3 2 C9 1 C4 1 C10, C13 2 C5 1 C11 0 C6 1 C14 1 ________________________________________________________________ Maxim Integrated Products 1 For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com. MAX4273 Evaluation Kit Evaluates: MAX4273 Component List (continued) DESIGNATION R1, R4, R5 R2, R7 R3 R6 R8 QTY 3 2 1 1 0 DESCRIPTION 1M 5% resistors (0805) 10k 1% resistors (0805) 0.004 1% 1W power resistor Dale WSL2512 0.004 1% R86 IRC OARS-1-4m 64.9k 1% resistor (0805) Not installed, resistor (0805) 30V, 100A N-channel MOSFET (D2PAK) Fairchild FDB7030L or International Rectifier IRL3803S Uninsulated banana jacks Mouser 530-108-0740-1 2-pin headers 3-pin headers 4-pin header Shunts (JU1-JU7) Rubber bumpers 3M SJ-5003 MAX4273EEE (16-pin QSOP) MAX4273 data sheet MAX4273 EV kit data sheet MAX4273 Configuration +5V, 10A Output 1) Verify that shunts are on jumpers JU4 (CSPD), JU5 (AUXVCC), and JU7 (CTON). 2) Verify that jumper JU1 (ON) does not have a shunt installed. 3) Verify that jumper JU3 (RTH) has a shunt installed on pins 1 and 3. 4) Verify that a shunt is installed on pins 2 and 3 of jumper JU2 (CTIM) and on pins 1 and 2 of jumper JU6 (GATE). 5) Utilizing very short 10A rated banana leads (<6in long), connect the +5VDC power supply to the V IN pad. Utilizing very short 10A rated banana leads (<6in long), connect the supply ground to the GND pad. 6) Connect a voltmeter to the VOUT and GND pads. 7) Turn on the power supply and verify that the voltage at VOUT is +5V. 8) Test point 1 (TP1) is provided to observe the MOSFET gate voltage with an oscilloscope. Note: The banana leads connecting the power supply and the load to the EV kit must be very short (<6in long) and rated for at least 10A of current. N1 1 J1-J4 JU1, JU4, JU5, JU7 JU2, JU6 JU3 None None U1 None None 4 4 2 1 7 4 1 1 1 Detailed Description The MAX4273 EV kit is a hot-swap controller circuit board that provides configurable current-limiting and bilevel fault protection for the output. The bilevel fault protection provides low-amplitude current-overload protection and protection from instantaneous faults such as a short-circuit condition. The circuit uses a MAX4273 IC, configured for an input range of +5V to +13.2V, and can pass up to 10A of current to the output. The input feeds a current-sense resistor and Nchannel MOSFET, which controls current between the input and output of the EV kit. The MAX4273 IC controls the N-channel MOSFET in conjunction with gate capacitors, which provide current regulation during startup and bilevel fault protection during steady-state operation. A jumper to capacitors and a resistor allow control of the MOSFET gate charging time. A test point is provided to verify the gate signal with an oscilloscope. The MAX4273 EV kit features a POR that will trip when the input voltage drops by 10%. The autoretry, glitch filters, and auxiliary Vcc power have jumpers that allow easy configuration changes. Through proper selection of jumpers, the EV kit can emulate the MAX4271 and Component Suppliers SUPPLIER Dale/Vishay Fairchild International Rectifier IRC Murata Sanyo USA Taiyo Yuden PHONE 402-564-3131 408-822-2000 310-322-3331 512-992-7900 814-237-1431 619-661-6835 408-573-4150 FAX 402-563-6418 408-822-2102 310-322-3332 512-992-3377 814-238-0490 619-661-1055 408-573-4159 Note: Please indicate that you are using the MAX4273 when contacting these component suppliers. Quick Start The MAX4273 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. 2 _______________________________________________________________________________________ MAX4273 Evaluation Kit MAX4272 hot-swap controllers. PC board pads for extra output capacitors are provided on the EV kit. Evaluates: MAX4273 Table 3. Jumper JU3 Functions SHUNT LOCATION 1, 4 RTH PIN FAST COMPARATOR Fast comparator and current regulation disabled 200mV internal threshold 100mV threshold Jumper Selection Tables 1-7 display the functions provided by the MAX4273 EV kit. MOSFET Enable and Fault Resetting The MAX4273 EV kit features a combination shutdown/unlatch fault mode. The 2-pin jumper, JU1, selects the shutdown/unlatch mode for the MAX4273 EV kit. Table 1 lists the selectable jumper options. Connected to VIN 1, 2 1, 3 Connected to GND Connected to R2 Table 1. Jumper JU1 Functions SHUNT LOCATION Installed ON PIN ON pin pulled low EV KIT OUTPUT Disable MOSFET N1, unlatch fault Enable MOSFET N1, normal operation* Slow Comparator Response Time The MAX4273 EV kit features two choices for the slow comparator response time. The 2-pin jumper, JU4, is used to select other speed settings. Table 4 lists the selectable jumper options. Table 4. Jumper JU4 Functions SHUNT LOCATION Installed CSPD PIN Connected to C2 and C10 SLOW COMPARATOR 22ms slow comparator response time 2ms slow comparator response time None ON pin pulled high *If JU2 is set for latched mode, the device will be latched following a fault condition. ON Pin and Latched and Retry Modes The MAX4273 EV kit features a jumper to select latched mode or retry timer settings. The 3-pin jumper, JU2, selects the retry time for the MAX4273 IC. Table 2 lists the various jumper options. None Connected to C10 Table 2. Jumper JU2 Functions SHUNT LOCATION 1, 2 2, 3 None CTIM PIN Connected to VIN Connected to C3 and C13 Connected to C13 EV KIT MODE Latched mode Retry mode, 1.1s Auxiliary VCC Power The MAX4273 EV kit features an auxiliary supply for VCC. A capacitor on the auxiliary supply pin provides energy to the IC during a short-circuit fault condition, which could cause the main system power supply to collapse. The 2-pin jumper, JU5, enables or disables the feature by connecting or disconnecting the capacitor. Table 5 lists the selectable jumper options. Table 5. Jumper JU5 Functions Retry mode, 100ms SHUNT LOCATION Installed AUXVCC PIN AUXVCC pin connected to C1 AUXVCC pin floating EV KIT MODE Auxiliary supply connected Auxiliary supply disconnected Fast Comparator and Current Regulation The MAX4273 EV kit features a jumper to enable or disable the fast comparator and to set the threshold level. The 3-pin jumper, JU3, selects the threshold level. Table 3 lists the jumper options. None _______________________________________________________________________________________ 3 MAX4273 Evaluation Kit Evaluates: MAX4273 MOSFET Charging Time The MAX4273 EV kit features several choices for controlling the charging time of the N-channel MOSFET. Jumper JU6 selects the charge time for the MOSFET. Table 6 lists the selectable jumper options. The charging time reflects output voltage close to the final value. FET. See Table 1 for proper jumper settings. An external controller can be utilized to control the ON pin of the MAX4273. Refer to the MAX4273 data sheet for additional functions of the ON pin when toggling it. Caution: Do not connect an external microcontroller to the ON pad while a shunt is installed on jumper JU1. The shunt provides a short from ON to GND and may damage the external controller. +3V, 10A Evaluation The MAX4273 EV kit can evaluate a hot-swap controller operating at +3V and provide up to 10A of current at the output. Replace POR resistor R6 with a 34.8k resistor to obtain a trip level of 2.7V at VIN. For other current levels, resistor R3 must be replaced with a resistor selected for the desired current. If a different fast comparator threshold is desired, resistor R2 must also be replaced. Refer to the MAX4273 data sheet for information on selecting resistors R2 and R3. +12V, 2A Evaluation The MAX4273 EV kit can evaluate a hot-swap controller operating at +12V and provide up to 2A of current at the output. Replace POR resistor R6 with a 169k resistor to obtain a trip level of 10.8V at VIN. Resistor R3 must be replaced with a resistor selected for the 2A load. If a different fast comparator threshold is desired, resistor R2 must also be replaced. Refer to the MAX4273 data sheet for information on selecting resistors R2 and R3. Table 6. Jumper JU6 Functions SHUNT LOCATION 1, 2 GATE PIN MOSFET CHARGE TIME 7ms gate charging time, fast discharge possible 22ms gate charging time 215s gate charging time Connected to C5 2, 3 None Connected to C9 Connected to N1 gate terminal only Startup Timer Setting The MAX4273 EV kit features two choices for the longest time allowed to completely turn on the MOSFET. Jumper JU7 selects the time and Table 7 lists the selectable jumper options. Table 7. Jumper JU7 Functions SHUNT LOCATION Installed None CTON PIN Connected to C4 and C14 Connected to C14 EV KIT MODE 1.1ms TON setting 103s TON setting MAX4271/MAX4272 Emulation The MAX4273 EV kit can emulate the MAX4271 and MAX4272 IC features. The EV kit uses a MAX4273 IC and properly set jumpers to emulate a MAX4271 or MAX4272 design. See Table 8 or 9 to emulate a MAX4271 or MAX4272 design, respectively. Refer to the MAX4273 data sheet for a description of specific pin functions of the MAX4273 IC and its associated external components. Caution: Only one emulation mode can be evaluated at a time. Control Modes MOSFET Gate Control The MAX4273 EV kit features several options to control the MOSFET gate charging time. Table 6 lists the various jumper selectable options. Resistor R8 is also provided to prevent MOSFET oscillations when a capacitor to ground is used. The shorted trace across resistor R8 must be cut open prior to using it. Refer to the MAX4273 data sheet for information on selecting the value of resistor R8. Test point TP1 is provided to observe the gate voltage with an oscilloscope. Fault Resetting The MAX4273 EV kit features a jumper (JU1) to latch/unlatch faults and enable/disable the output MOS4 _______________________________________________________________________________________ MAX4273 Evaluation Kit Evaluates: MAX4273 Table 8. Emulating a MAX4271 Design JUMPER JU1 JU1 JU2 JU3 JU4 JU4 JU5 JU6 JU6 JU7 JU7 JU8 SHUNT LOCATION Installed None 1, 2 1, 2 Installed None None 2, 3 None Installed None Cut open the trace shorting JU8 MAX4273 PIN ON ON CTIM RTH CSPD CSPD AUXVCC GATE GATE CTON CTON LLMON MAX4271 EV KIT MODE EMULATED Disable MOSFET N1, unlatch fault Enable MOSFET N1, normal operation No retry, latched mode 200mV internal fast comparator threshold (50A) 22ms slow comparator speed setting 2ms slow comparator speed setting AUXVCC disabled 22ms MOSFET gate charging time 215s MOSFET gate charging time 1.1ms startup timer TON setting* 103s startup timer TON setting* No line-load monitor feature when emulating a MAX4271** *The MAX4273 CTON pin is providing the CTIM functionality of the MAX4271. **When demonstrating a MAX4273 EV kit, the PC board trace shorting jumper JU8 must be reinstalled with a wire jumper. Table 9. Emulating a MAX4272 Design JUMPER JU1 JU1 JU2 JU2 JU3 JU4 JU4 JU5 JU6 JU6 JU7 JU7 JU8 SHUNT LOCATION Installed None 2, 3 None 1, 2 Installed None None 2, 3 None Installed None Cut open the trace shorting JU8 MAX4273 PIN ON ON CTIM CTIM RTH CSPD CSPD AUXVCC GATE GATE CTON CTON LLMON MAX4272 EV KIT MODE EMULATED Disable MOSFET N1 Enable MOSFET N1 Retry mode, 1.1s retry time Retry mode, 100ms retry time 200mV internal fast comparator threshold (50A) 22ms slow comparator speed setting 2ms slow comparator speed setting AUXVCC disabled 22ms MOSFET gate charging time 215s MOSFET gate charging time 1.1ms startup timer TON setting*, default 103s startup timer TON setting*, default No line-load monitor feature when emulating a MAX4272 ** *The total capacitance on the CTON pin (C4, C14) must equal the total capacitance on the CTIM pin. This will emulate the shared functionality of a MAX4272 CTIM pin. Refer to the MAX4271/MAX4272/MAX4273 data sheet Table 4 or the Pin Description for more details on CTIM and CTON. **When demonstrating a MAX4273 EV kit, the PC board trace shorting jumper JU8 must be reinstalled with a wire jumper. _______________________________________________________________________________________ 5 Evaluates: MAX4273 MAX4273 Evaluation Kit Figure 1. MAX4273 EV Kit Schematic VIN C8 OPEN INC JU3 3 R2 10k 1% R6 64.9k 1% JU5 2 2 JU4 10 U1 IN C12 1.0F VSEN JU2 11 CTIM GATE 5 1 C5 0.068F 6 7 LLMON OUTC GND 8 R5 1M OUTC 16 JU8 VIN C7 OPEN C11 OPEN 2 JU6 3 C9 0.22F TP1 J3 CTON JU7 9 C14 330pF CEXT 13 ON INC REF 15 14 4 VSEN 2 R8 SHORT 1 N1 3 R3 0.004 1% 12 STAT 3 R1 1M C2 0.1F C10 0.01F AUXVCC CSPD RTH 1 4 1 C1 1.0F VIN R7 10k 1% 6 MAX4273 VIN VIN 1 2 3 C3 0.1F C13 0.01F C4 3300pF VOUT C6 1000F 16V GND J4 VIN J1 VIN GND GND J2 STAT R4 1M ON JU1 INC _______________________________________________________________________________________ REF GND MAX4273 Evaluation Kit Evaluates: MAX4273 1.0" 1.0" Figure 2. MAX4273 EV Kit Component Placement Guide--Top Silkscreen Figure 3. MAX4273 EV Kit PC Board Layout--Component Side _______________________________________________________________________________________ 7 MAX4273 Evaluation Kit Evaluates: MAX4273 1.0" 1.0" Figure 4. MAX4273 EV Kit Component Placement Guide-- Bottom Figure 5. MAX4273 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. 8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. |
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