MAX5072EVKIT

19-3603; Rev 0; 3/05 MAX5072 Evaluation Kit The MAX5072 evaluation kit (EV kit) is a fully assembled and tested circuit board that contains all the components necessary to evaluate the performance of the MAX5072. The MAX5072 is a dual-output DC-DC converter. One of the outputs is configured as a step-down converter (converter 1), while converter 2 is configured as a step-up converter. The EV kit is powered from a DC supply providing 5.5V to 16V. The EV kit can be reconfigured for an input voltage range between 4.5V to 5.5V. The MAX5072 EV kit is capable of delivering 3.3V at 2A from the step-down converter output and 12V at up to 0.22A from the step-up converter output. The MAX5072 switching frequency is set to 2.2MHz and the two outputs switch 180° out of phase. A SYNC input facilitates external frequency synchronization. Moreover, a CLKOUT output provides a clock signal that is 90° out of phase with respect to the step-up converter, allowing four-phase operation using two MAX5072 ICs in master-slave configuration. The MAX5072 includes a power-good output for converter 1, a reset output, and a manual reset input. In addition, each output, can be shut down individually. The MAX5072 features a power-fail output, which provides a logic-low when the input voltage drops below a preprogrammed threshold. The MAX5072 is available in a thermally enhanced 32-pin thin QFN package. Features ♦ 5.5V to 16V Input Supply Voltage Range ♦ 4.5V to 5.5V Input Supply Voltage Range (Configurable) ♦ 3.3V at 2A Output (Step-Down Converter) ♦ 12V at 0.22A Output (Step-Up Converter) ♦ 180° Out-of-Phase Operation Reduces Input Capacitance ♦ Clock Output for Four-Phase Operation ♦ Programmable Switching Frequency (200kHz to 2.2MHz) ♦ Individual Enable Inputs, SYNC Input, and Manual Reset Input ♦ Power-On Reset Output and Power-Fail Output ♦ Low-Cost Solution ♦ Fully Assembled and Tested Ordering Information PART TEMP RANGE IC PACKAGE MAX5072EVKIT 0°C to +70°C 32 TQFN-EP* *EP = Exposed paddle. Component List DESIGNATION QTY 10µF ±20%, 16V X5R ceramic capacitors (1206) TDK C3216X5R1C106M C7, C12 2 560pF ±5%, 50V C0G ceramic capacitors (0603) TDK C1608C0G1H561J 1 1µF ±10%, 25V X7R ceramic capacitor (0805) TDK C2012X7R1E105K C8 1 4.7µF ±10%, 6.3V X5R ceramic capacitor (0603) TDK C1608X5R0J475K 4 0.1µF ±10%, 50V X7R ceramic capacitors (0603) TDK C1608X7R1H104K C9, C20 2 0.22µF ±20%, 16V X7R ceramic capacitors (0603) TDK C1608X7R1C224M 1 47µF ±20%, 10V aluminum electrolytic capacitor (6.3mmx6.0mm) Sanyo 10CV47EX C10 1 2200pF ±10%, 50V C0G ceramic capacitor (0603) TDK C1608X7R1H222K 2 100pF ±5%, 50V C0G ceramic capacitors (0603) TDK C1608C0G1H101J C11 1 22pF ±5%, 50V C0G ceramic capacitor (0603) TDK C1608C0G1H220J DESIGNATION QTY C1, C16 2 C2 C3, C13, C15, C17 C4 C5, C6 DESCRIPTION DESCRIPTION Component List continued on next page. ________________________________________________________________ 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: MAX5072 General Description MAX5072 Evaluation Kit Evaluates: MAX5072 Component List (continued) DESIGNATION QTY C14 1 C18 C19 1 1 DESCRIPTION 22µF ±10%, 16V X5R ceramic capacitor (1210) TDK 3225X5R1C226K 1µF ±10%, 10V X7R ceramic capacitor (0603) TDK C1608X7R1A105K 150µF ±20%, 25V aluminum electrolytic capacitor (case size F or 8.3mm x 8.3mm) Panasonic EEVFK1E151P DESIGNATION QTY DESCRIPTION L2 1 4.7µH, 1.8A, 90mΩ inductor Pulse PG0063.472 R1 1 133kΩ ±1% resistor (0603) R2 1 42.2kΩ ±1% resistor (0603) R3 1 2.21kΩ ±1% resistor (0603) R4, R11, R12, R13, R17 5 10.0kΩ ±1% resistors (0603) R5 1 5.62kΩ ±1% resistor (0603) R6 1 22.1kΩ ±1% resistor (0603) R7 1 1kΩ ±1% resistor (0603) R8 1 68.1kΩ ±1% resistor (0603) R9 1 4.87kΩ ±1% resistor (0603) 1 200mA 30V Schottky diode (SOD-123) Diodes Inc. BAT42W 1 3A 40V Schottky rectifier (SMB) Diodes Inc. B340LB D3 1 2A 40V Schottky rectifier (SMB) Diodes Inc. B240 JU1 0 Not installed, 3-pin header SW1 1 Pushbutton switch (normally open) JU2 0 Not installed, 2-pin header None 3 Shunts None 1 MAX5072 PC board D1 D2 JU3, JU4, JU5 3 2-pin headers J1 1 6-pin header L1 1 4.7µH, 4.8A, 18mΩ inductor Pulse P0751.472 Sumida CDR95NP-4R7MC R10 1 110kΩ ±1% resistor (0603) R14, R15, R16 3 100kΩ ±5% resistors (0603) R18 1 4.7Ω ±5% resistor (0603) 1 MAX5072ETJ (32-pin TQFN, 5mm x 5mm) U1 Component Suppliers SUPPLIER Diodes, Inc. PHONE FAX 805-446-4800 805-446-4850 WEBSITE www.diodes.com Panasonic 714-373-7366 714-737-7323 www.panasonic.com Pulse Engineering 858-674-8100 858-674-8262 www.pulseeng.com Sanyo Electronic Device (U.S.A) Corporation 619-661-6835 619-661-1055 www.sanyodevice.com Sumida 847-545-6700 847-545-6720 www.sumida.com TDK 847-803-6100 847-390-4405 www.component.tdk.com Note: Indicate that you are using the MAX5072 EV kit when contacting these component suppliers. 2 _______________________________________________________________________________________ MAX5072 Evaluation Kit Recommended Equipment • Adjustable 5.5V to 16V, 3A DC power supply • Two electronic loads (e.g., HP6060B) • Two voltmeters Procedure The MAX5072 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. 1) Connect a voltmeter to the VOUT1 and PGND pads. 2) Verify that the jumpers JU3, JU4, and JU5 do not have a shunt installed. Converter 2 (VOUT2) is configured as a step-up converter. Converter 1’s output provides power to the converter 2 input. VOUT2 generates 12V and can provide up to 0.22A of current. Capacitors C10, C11, and C12 and resistors R6 and R7 provide a compensation network for VOUT2 on the MAX5072 EV kit. The switching frequency for each converter is set to 2.2MHz by resistor R5. The internal oscillator switching frequency of the MAX5072 is two times the individual converter switching frequency. To set the individual converter switching frequency between 200kHz and 2.2MHz, select a different resistor value for R5. Refer to the Internal Oscillator section in the MAX5072 IC data sheet for instructions on calculating R5. Each converter is switching 180° out of phase with respect to the other converter. 3) Connect a voltmeter to the VOUT2 and PGND pads. Enable (EN1 and EN2) 4) Connect a 2A electronic load to the VOUT1 and PGND pads. The MAX5072 EV kit provides separate enable inputs, EN1 and EN2, to individually control or sequence the output voltages. The enable signals EN1 and EN2 are pulled up to VL (5V) by resistors R14 and R15, respectively. The external enable input signal can be connected to pin 1 of header JU4 (JU4-1, EN1), and converter 2’s enable input signal can be connected to pin 1 of header JU5 (JU5-1, EN2). The MAX5072 enable pins are active-high and TTL compatible. 5) Connect a 0.22A electronic load to the VOUT2 and PGND pads. 6) Connect a 5.5V to 16V DC power supply to the VIN and PGND pads, set the voltage in the range of 5.5V to 16V. 7) Turn on the power supply. 8) Verify that VOUT1 is 3.3V throughout the 5.5V to 16V input voltage range. 9) Verify that VOUT2 is 12V throughout the 5.5V to 16V input voltage range. 10) Turn on both electronic loads. Repeat steps 7 and 8. Detailed Description The MAX5072 EV kit contains two switching DC-DC converters. Each converter can be configured as either a step-down or a step-up converter. The MAX5072’s individual converter switching frequency can be set within the 200kHz to 2.2MHz range. The EV kit is designed to operate from a DC power supply that can provide 5.5V to 16V and 3A of current. The EV kit can be reconfigured for a 4.5V to 5.5V input voltage range by shorting jumper JU2. Converter 1 (VOUT1) is configured as a step-down converter. VOUT1 generates 3.3V and can provide up to 2A of current. Capacitors C5, C6, and C7 and resistors R3 and R4 provide a compensation network for VOUT1 on the MAX5072 EV kit. Manual Reset Button (SW1) The MAX5072 EV kit provides a manual reset pushbutton switch (SW1) that is connected to the MR pin of the MAX5072. Push and release the manual reset pushbutton switch to initiate a reset of the circuit. Reset Output Signal (RST) The MAX5072 EV kit provides a reset output signal on pin 1 of header J1 (J1-1). The reset pin is pulled up to VOUT1 by a 10kΩ resistor (R13). The MAX5072 RST pin output is pulled low when either VOUT1 or VOUT2 falls below 92.5% of their nominal regulation voltage. Once both outputs exceed 92.5% of their nominal regulated voltages, the RST output goes high after the active-reset timeout period (180ms). Power-Good Output (PGOOD1) Converter 1 provides a power-good output signal. The PGOOD1 is pulled up to VOUT1 by a 10kΩ resistor R12. When VOUT1 drops below 92.5% of its nominal regulated voltage, PGOOD1 is pulled low. The PGOOD1 output signal is available on pin 5 of header J1 (J1-5). _______________________________________________________________________________________ 3 Evaluates: MAX5072 Quick Start Evaluates: MAX5072 MAX5072 Evaluation Kit Power-Fail Output (PFO) Jumper Selection The MAX5072 EV kit features a power-fail output (PFO) on pin 4 of header J1 (J1-4) to provide an advance signal before the outputs drop out of regulation. PFO is pulled up to VL (5V) by a 10kΩ resistor (R17). The PFO output is pulled low when the input voltage VIN drops below 9.6V. The threshold voltage is set by resistors R10 and R11. To set a different threshold voltage for the PFO, select different values for resistors R10 and R11. Refer to the Dying Gasp Comparator section in the MAX5072 IC data sheet for selecting the values for R10 and R11. Input Source for Converter 2 (JU1) The MAX5072 EV kit features an option to select the input source for converter 2. Jumper JU1 selects the input source for converter 2 on the MAX5072 EV kit. Table 1 lists the selectable JU1 jumper options. Note that jumper JU1 is not installed and is shorted between pin holes 1 and 2 by a PC board trace. To utilize jumper JU1, cut open the PC board trace between pin holes 1 and 2, and install a shorting wire between pin holes 2 and 3. Synchronization Input (SYNC) The MAX5072 EV kit provides a synchronization (SYNC) input that enables the MAX5072 to synchronize with external systems. The synchronization frequency is two times the individual converter switching frequency. To synchronize the MAX5072 EV kit with an external clock, connect a 4.4MHz TTL clock signal to pin 3 of header J1 (J1-3). Clock Output (CLKOUT) The MAX5072 EV kit provides a clock output (CLKOUT) that enables two MAX5072 EV kits to be connected in a master-slave configuration operating in four-phase mode. The CLKOUT is 90° phase-shifted with respect to the internal switch turn-on edge. The CLKOUT is two times the individual converter switching frequency. Feed the CLKOUT output signal of the master EV kit to the SYNC input of the slave EV kit. The effective input ripple switching frequency will be four times the individual converter’s switching frequency. The CLKOUT output is available on pin 6 of header J1 (J1-6). Table 1. Jumper JU1 Functions SHORT LOCATION CONVERTER 2 INPUT SOURCE 1-2 (Shorted, default) VOUT1 2-3 VIN Input Voltage Range (JU2) The MAX5072 EV kit can be reconfigured for an input voltage range between 4.5V to 5.5V by shorting jumper JU2. Jumper JU2 selects the input voltage range for the MAX5072 EV kit. Table 2 lists the selectable JU2 jumper options. Note that jumper JU2 is not installed. To utilize jumper JU2, install a shorting wire between its pin holes. Table 2. Jumper JU2 Functions SHORT LOCATION EV KIT INPUT VOLTAGE RANGE (V) Not Installed (Default) 5.5 to 16 Installed 4.5 to 5.5 Frequency Select (FSEL1) The MAX5072 EV kit provides an option to reduce the converter 1 switching frequency to one-half of converter 2. As configured, the MAX5072 FSEL1 pin is pulled up to VL (5V) by a 100kΩ resistor (R16). When FSEL1 is high, converter 1’s switching frequency is the same as converter 2’s switching frequency. To reduce converter 1’s switching frequency to one-half of converter 2 install a shunt on jumper JU3. 4 _______________________________________________________________________________________ MAX5072 Evaluation Kit Converter 1 Enable, EN1 (JU4) The MAX5072 EV kit provides an option to disable converter 1. Use jumper JU4 to disable converter 1 on the MAX5072 EV kit (see Table 4). Table 3. Jumper JU3 Functions SHUNT LOCATION FSEL1 CONNECTED TO CONVERTER 1’S SWITCHING FREQUENCY Not Installed (Default) VL (through resistor R16) Same as Converter 2 Installed SGND One-half of Converter 2 Converter 2 Enable, EN2 (JU5) The MAX5072 EV kit provides an option to disable converter 2. Use jumper JU5 to disable converter 2 on the MAX5072 EV kit (see Table 5). Table 4. Jumper JU4 Functions SHUNT LOCATION EN1 CONNECTED TO CONVERTER 1 Not Installed (Default) VL (through resistor R14) Enabled Installed SGND Disabled Table 5. Jumper JU5 Functions SHUNT LOCATION EN2 CONNECTED TO CONVERTER 2 Not Installed (Default) VL (through resistor R15) Enabled Installed SGND Disabled _______________________________________________________________________________________ 5 Evaluates: MAX5072 Converter 1 Frequency Selection, FSEL1 (JU3) The MAX5072 EV kit provides an option to reduce the converter 1 switching frequency to one-half of converter 2. Jumper JU3 selects the switching frequency for converter 1 on the MAX5072 EV kit. Table 3 lists the selectable JU3 jumper options. Evaluates: MAX5072 MAX5072 Evaluation Kit (SHORT) (PC BOARD TRACE) VOUT1 R10 110kΩ 1% R11 10kΩ 1% VIN 3 1 JU1 2 C16 10µF 16V C17 0.1µF SGND VIN 12 21 C1 10µF 16V C19 150µF 25V PGND C2 1µF 25V L1 4.7µH VOUT1 C18 1µF 10V 22 D1 DRAIN2 DRAIN2 DRAIN1 BST2/VDD2 23 27 R1 133kΩ 1% SOURCE1 SOURCE2 SOURCE2 SOURCE1 FB2 19 FB1 18 VL C7 560pF JU2 13 14 C8 4.7µF 6.3V C9 0.22µF 16V PGND C20 0.22µF 16V 32 R8 68.1kΩ 1% 6 COMP1 C11 22pF COMP2 RST R9 4.87kΩ 1% C12 560pF 17 C10 2200pF R13 10kΩ VOUT1 1% R6 22.1kΩ 1% J1-1 J1-2 VL PFO BYPASS PGOOD1 CLKOUT 9 8 J1-3 J1-4 OSC EN1 FSEL1 SW1 16 MR EN2 PGND PGND SGND 30 28 29 R17 10kΩ 1% J1-5 1 J1-6 R14 100kΩ 20 VL R12 10kΩ 1% R16 100kΩ 24 R15 100kΩ 5 VL JU3 JU5 Figure 1. MAX5072 EV Kit Schematic 6 VL VOUT1 25 JU4 11 R7 1kΩ 1% 7 VL SYNC 15 R5 5.62kΩ 1% 31 MAX5072 R4 10kΩ 1% VIN C15 0.1µF 50V C13 0.1µF U1 R2 42.2kΩ C6 1% 100pF C5 100pF C14 22µF 16V 2 BST1/VDD1 D2 R3 2.21kΩ 1% VOUT2 D3 3 4 C3 0.1µF 26 C4 47µF 10V DRAIN1 VL R18 4.7Ω VL PGND PFI V+ VIN L2 4.7µH 10 _______________________________________________________________________________________ VL MAX5072 Evaluation Kit Evaluates: MAX5072 Figure 2. MAX5072 EV Kit Component Placement Guide— Component Side Figure 3. MAX5072 EV Kit PC Board Layout—Component Side _______________________________________________________________________________________ 7 Evaluates: MAX5072 MAX5072 Evaluation Kit Figure 4. MAX5072 EV Kit PC Board Layout—GND Layer 2 8 Figure 5. MAX5072 EV Kit PC Board Layout—Inner Trace Layer 3 _______________________________________________________________________________________ MAX5072 Evaluation Kit Evaluates: MAX5072 Figure 6. MAX5072 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 _____________________ 9 © 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.