19-2976; Rev 0; 9/03 MAX1960 Evaluation Kit Features ♦ 2.35V to 5.5V Input Supply Range ♦ 1.8V Output at Up to 15A ♦ Output Voltage Adjustable Down to 0.8V ♦ Fixed-Frequency PWM Operation ♦ Selectable 500kHz/1MHz or External Synchronization ♦ ±4% Voltage Margining Ordering Information PART MAX1960EVKIT TEMP RANGE 0°C to +70°C IC PACKAGE 20 QSOP Component List DESIGNATION QTY C1 C2, C3, C13 C4 C5 C6 C7, C8, C9 C10, C38 C11 C12 DESCRIPTION 1 0.47µF ±10%, 10V X5R ceramic capacitor (0603) TDK C1608X5R1A474K or equivalent 0 Not installed; 0.47µF ±10%, 10V X5R ceramic capacitors (0603) TDK C1608X5R1A474K or equivalent (tripler) 1 1µF ±20%, 6.3V X5R ceramic capacitor (0402) Panasonic ECJ0EB0J105M or equivalent 1 0.1µF ±10%, 10V X5R ceramic capacitor (0402) TDK C1005X5R1A104K or equivalent DESIGNATION QTY DESCRIPTION C14, C15 2 680µF, 2.5V, 8mΩ POSCAPs Sanyo 2R5TPD680M8 C16, C17 2 4700pF ±10%, 50V X7R ceramic capacitors (0603) TDK C1608X7R1H472K or equivalent C37 1 470µF, 6.3V POSCAP Sanyo 6TPB470M D1 1 Single Schottky diode (SOT-323) Central CMSSH-3 D2–D5 0 Not installed, Schottky diodes (SOD-123) Central CMHSH5-2L (tripler) JU1, JU2, JU3 3 3-pin headers JU4 1 4-pin 3-way header 1 2.2µF ±10%, 6.3V X5R ceramic capacitor (0603) TDK C1608X5R0J225K or equivalent L1 1 0.22µH inductor Sumida CDEP105(S)-0R2NC-50 3 10µF ±20%, 6.3V X5R ceramic capacitors (0805) Panasonic ECJ2FB0J106M or equivalent N1 1 N-channel MOSFET (D-Pak) IRF IRLR7821 N2 1 N-channel MOSFET (D-Pak) IRF IRLR7833 2 0.22µF ±10%, 6.3V X5R ceramic capacitors (0402) TDK C1005X5R0J224K or equivalent R1 1 301kΩ ±1% resistor (0603) R2 1 6.8kΩ ±5% resistor (0603) R3 1 12.4kΩ ±1% resistor (0603) R4 1 10kΩ ±1% resistor (0603) R5 1 10Ω ±5% resistor (0603) R12, R13 2 1Ω ±5% resistors (0603) 1 1 Not installed, 10pF ceramic capacitor (0402) 0.01µF ±10%, 25V X7R ceramic capacitor (0402) Murata GRP155R71E103K or equivalent U1 1 Maxim MAX1960EEP (20-pin QSOP) None 4 Shunts, two position None 1 MAX1960EVKIT PC board ________________________________________________________________ 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: MAX1960/MAX1961/MAX1962 General Description The MAX1960 evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board that evaluates the MAX1960 family of PWM synchronous step-down controllers. There are two circuits on the board. The first has the MAX1960 installed but can also be used to evaluate the MAX1961. This circuit provides a 1.8V output at up to 15A, or the output can be adjusted from 0.8V to (0.9 ✕ VIN). The second circuit evaluates the MAX1962. Components for the second circuit are not installed on the standard evaluation kit. Both circuits can operate with a 2.35V to 5.5V input voltage. Evaluates: MAX1960/MAX1961/MAX1962 MAX1960 Evaluation Kit The following components are for the optional MAX1962 circuit and are not installed: DESIGNATION QTY C18, C19 C20, C21 C22, C32, C33 C23 C24 C25, C39 C26, C27, C28 C29 C30 C31 C34 C35 DESCRIPTION 2 680µF, 2.5V, 8mΩ POSCAPs Sanyo 2R5TPD680M8 or equivalent 2 4700pF ±10%, 50V X7R ceramic capacitors (0603) TDK C1608X7R1H472K or equivalent 0 Not installed; 1µF ±10%, 16V X5R ceramic capacitors (0603) Panasonic ECJ1VB1C105K or equivalent (tripler) 1 6800pF ±10%, 25V X7R ceramic capacitor (0402) Murata GRP155R71E682K or equivalent 1 Not installed, 10pF ceramic capacitor (0402) 2 0.22µF ±10%, 6.3V X5R ceramic capacitors (0402) TDK C1005X5R0J224K or equivalent 3 1 4.7µF ±10%, 6.3V X5R ceramic capacitor (0603) Panasonic ECJ1VB0J475K or equivalent 1 1 1µF ±20%, 6.3V X5R ceramic capacitor (0402) Panasonic ECJ0EB0J105M or equivalent 1 1µF ±10%, 16V X5R ceramic capacitor (0603) Panasonic ECJ1VB1C105K or equivalent 470µF, 6.3V POSCAP Sanyo 6TPB470M DESCRIPTION C36 1 Not installed (0805) D6 1 Single Schottky diode (SOT-323) Central CMSSH-3 D7–D10 4 Not installed, Schottky diodes (SOD-123) Central CMHSH5-2L (tripler) JU5 1 4-pin 3-way header JU6, JU7 2 3-pin headers JU8 1 2-pin header L2 1 0.45µH inductor Sumida CDEP105(S)-0R4MC-50 N3 1 N-channel MOSFET (D-Pak) IRF IRLR7821 N4 1 N-channel MOSFET (D-Pak) IRF IRLR7833 R6 1 10kΩ ±1% resistor (0603) R7 1 12.4kΩ ±1% resistor (0603) R8 1 20kΩ ±5% resistor (0603) R9 1 1.5mΩ ±5%, 1W resistor (2512) Panasonic ERJM1WTJ1M5U R10 1 10Ω ±5% resistor (0603) 10µF ±20%, 6.3V X5R ceramic capacitors (0805) Panasonic ECJ2FB0J106M or equivalent 0.1µF ±10%, 10V X5R ceramic capacitor (0402) TDK C1005X5R1A104K or equivalent 1 DESIGNATION QTY R11 1 Not installed (0603) R14, R15 2 1Ω ±5% resistors (0603) U2 1 MAX1962EEP (20-pin QSOP) None 3 Shunts Component Suppliers SUPPLIER Central Semiconductor International Rectifier Kamaya PHONE WEBSITE 631-435-1110 www.centralsemi.com 310-322-3331 www.irf.com 260-489-1533 www.kamaya.com Murata 814-237-1431 www.murata.com Panasonic 714-373-7939 www.panasonic.com Sanyo 619-661-6835 www.sanyo.com Sumida 847-545-6700 www.sumida.com TDK 847-803-6100 www.component.tdk.com Note: Please specify that you are using the MAX1960/ MAX1961/MAX1962 when contacting these suppliers. 2 _______________________________________________________________________________________ MAX1960 Evaluation Kit 1) Verify jumpers JU1, JU2, and JU3 are shorted between pins 2 and 3. 2) Preset input power supply to between 2.7V and 5.5V. Turn power supply off. 3) Connect the positive power-supply lead to the IN1 pad on the EV kit. Connect the supply ground to the PGND1 pad on the EV kit. 4) Connect a voltmeter and load from OUT1 to PGND1 on the EV kit. 5) Turn on the power supply. 6) Verify that the voltage at OUT1 is +1.8V ±1.5%. Table 5. JU8 Functions JUMPER POSITION 1-2 Not connected Table 6. JU9 and JU11 Functions JUMPER PADS Open Short OUT1 FUNCTION JUMPER PADS Open Short JU1 POSITION JU2 POSITION 1-2 1-2 Shutdown 1-2 2-3 -4% margining 2-3 1-2 +4% margining Open 2-3 2-3 Enable (normal operation) Short Table 2. JU3 and JU6 Functions JUMPER POSITION 1-2 2-3 Not connected OPERATING FREQUENCY 500kHz 1MHz Clock applied to SYNC_ input Table 3. JU4 and JU5 Functions (MAX1961/MAX1962) JUMPER POSITION 1-2 1-3 1-4 Not connected OUTPUT VOLTAGE +1.5V +1.8V +3.3V +2.5V CHARGE PUMP 2x (normal) 3x (tripler) Table 7. JU10 Functions (MAX1960/MAX1961) Jumper Selection Table 1. JU1 and JU2 Functions (MAX1960/MAX1961) OUT2 VOLTAGE Selected with JU5 Adjustable—set with resistors R6 and R7 FUNCTION JU1 and JU2 function as shown in Table 1 CTL1 and CTL2 connected—use only one jumper on JU1 or JU2 for shutdown/enable Table 8. JU12 Functions (MAX1962) JUMPER PADS FUNCTION Uses inductor resistance for current sensing Uses current-sense resistor Detailed Description Evaluating the MAX1961 or MAX1962 The MAX1960 EV kit comes with the MAX1960 installed, but can also be used to evaluate the MAX1961 and the MAX1962. Free samples of these parts can be obtained from Maxim. To evaluate the MAX1961, first carefully remove U1 from the PC board and replace it with the MAX1961. Next, remove feedback resistors R3 and R4. Finally, short the pads of R3. The evaluation kit is now configured for the MAX1961. To evaluate the MAX1962, a second circuit is provided on the PC board. Components for this circuit do not come installed on the standard evaluation kit board. To configure the board for the MAX1962, install the components recommended in the Component List section. Table 4. JU7 Functions (MAX1962) JUMPER POSITION 1-2 2-3 OUT2 FUNCTION Shutdown Enable _______________________________________________________________________________________ 3 Evaluates: MAX1960/MAX1961/MAX1962 Quick Start The MAX1960 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: Evaluates: MAX1960/MAX1961/MAX1962 MAX1960 Evaluation Kit Setting the Output Voltage (MAX1960/MAX1962) The MAX1960 uses a pair of feedback resistors to set the output voltage, which is fixed at +1.8V from the factory. The output voltage of the MAX1962 can also be set with feedback resistors, or can use its preset output voltages like the MAX1961 (see the Selecting a Preset Output Voltage section). To change the output voltage on the MAX1960 circuit, first verify that a 10kΩ resistor is installed in R4. Then calculate a resistor value for R3: V R3 = R4 × OUT − 1 0.8 To set the output voltage on the MAX1962 circuit, first remove jumper JU8. Then, install a 10kΩ resistor in R6. Finally, calculate a resistor value for R7: V R7 = R6 × OUT − 1 0.8 When changing the output-voltage setting, refer to the MAX1960/MAX1961/MAX1962 data sheet for selecting compensation components, output inductor, and output capacitor for best performance. Selecting a Preset Output Voltage (MAX1961/MAX1962) First, follow the procedure given under the Evaluating the MAX1961 or MAX1962 section to set up the EV kit for using the MAX1961 or MAX1962. To select a preset output voltage with the MAX1962, short the pins of jumper JU8, remove resistors R6 and R7, and use JU5 to select the output voltage (Table 3). For the MAX1961, use JU4 to select the output voltage (Table 3). When selecting different output voltages, refer to the MAX1960/MAX1961/MAX1962 data sheet for selecting compensation components, output inductor, and output capacitor for best performance. Evaluating at Low Input Voltages (Tripler Configuration) In the default configuration, the EV kit works at input voltages from +2.7V to +5.5V. To work with input voltages below +2.7V, configure the charge pump as a tripler. When using the tripler, the input voltage range is +2.35V to +3.6V. To configure the charge pump as a tripler, use the following procedure: For the MAX1960/MAX1961 circuit: 1) Remove C1. 2) Add C2, C3, and C13 (see the Component List). 3) Add D2–D5 (see the Component List). 4) Short the pads of JU9. For the MAX1962 circuit: 1) Remove C34. 2) Add C22, C32, and C33 (see the Component List). 3) Add D7–D10 (see the Component List). 4) Short the pads of JU11. Changing the Switching Frequency JU3 and JU6 select between 500kHz and 1MHz operation. To optimize performance, it is also necessary to change the value of some of the components. The components for 1MHz operation come installed on the PC board (MAX1960/MAX1961 circuit), and are listed in the Component List table. For 500kHz operation, change the components listed in Table 9, and refer to the MAX1960/MAX1961/MAX1962 data sheet for selecting compensation components. The MAX1962 circuit component list is configured for 500kHz operation. Table 9. Component Changes for 500kHz Operation DESIGNATION (MAX1960/MAX1961) QTY C1 1 4 DESCRIPTION NOTES 1µF ±10%, 16V X5R ceramic capacitor (0603), Panasonic ECJ1VB1C105K Without tripler C2, C3, C13 3 1µF ±10%, 16V X5R ceramic capacitors (0603), Panasonic ECJ1VB1C105K With tripler C6 1 4.7µF ±10%, 6.3V X5R ceramic capacitor (0603), Panasonic ECJ1VB0J475K — L1 1 0.45µH inductor, Sumida CDEP105(S)-0R4MC-50 — _______________________________________________________________________________________ MAX1960 Evaluation Kit Evaluating Shutdown Shutdown mode turns off the IC, reducing the input current to below 10µA. For the MAX1960/MAX1961, JU1 and JU2 control the shutdown feature (Table 1). On the MAX1962, JU7 controls shutdown (Table 4). If voltage margining is not used on the MAX1960/ MAX1961, then the pads of JU10 can be connected together to allow shutdown/enable using a single jumper. If this is done, either JU1 or JU2 must be completely removed and the other used to control shutdown/enable. Connecting both jumpers can cause an input supply to ground short, which could damage the EV kit. Evaluating Voltage Margining (MAX1960/MAX1961) A voltage-margining feature is provided on the MAX1960 and MAX1961. This allows the output to be shifted up or down by 4%. Voltage margining is controlled by JU1 and JU2 (Table 1). _______________________________________________________________________________________ 5 Evaluates: MAX1960/MAX1961/MAX1962 Using SYNC and CLKOUT To synchronize the converter to an external clock, connect the clock signal (450kHz to 1.1MHz) to SYNC_. A clock output (CLKOUT_) is provided on the EV kit. CLKOUT_ functions both when the converter is switching at its preset frequency and when a SYNC signal is applied. The CLKOUT_ waveform is 180° out-of-phase with the converter’s clock, allowing a second converter to operate out-of-phase with the first by connecting CLKOUT_ of the first converter to SYNC_ of the second converter. Evaluates: MAX1960/MAX1961/MAX1962 MAX1960 Evaluation Kit VCC IN1 VDD C7 10µF PGND1 C8 10µF C9 10µF C37 470µF C38 0.22µF D2 D3 17 2 3 JU2 2 JU1 5 1 1 9 REF C10 0.22µF R2 6.8kΩ SYNC1 R1 C11 301kΩ 10pF 3 2 1 C+ CTL1 C- COMP DH VDD BST 11 JU3 1 4 VDD AVDD 10 REF 3 ILIM 2 CLKOUT1 CTL2 REF LX GND FSET/SYNC D5 15 JU9 7 C4 1µF DL PGND 19 VCC R5 10Ω R12 1Ω N1 C16 4700pF VDD 12 18 C3 0.47µF C1 0.47µF 16 JU10 6 C12 0.01µF MAX1960 VCC D4 C2 0.47µF U1 3 C13 0.47µF 2 3 C6 2.2µF D1 OUT1 L1 0.22µH C5 0.1µF 20 13 C14 680µF R13 1Ω N2 C17 4700pF 14 R3 12.4kΩ CLKOUT FB N.C. C15 680µF PGND1 8 R4 10kΩ 4 1 3 2 JU4 VCC2 IN2 VDD2 C28 C27 C26 C35 C39 D7 PGND2 C22 D8 D9 C33 U2 C+ 17 3 2 JU7 3 MAX1962 VCC EN 1 9 REF2 10 C23 C24 REF BST 11 GND LX C32 C34 15 JU11 7 C31 VCC2 R14 R10 DH VDD C25 N3 19 VDD2 C20 12 18 20 2 3 D6 L2 0.22µH C29 2 JU6 CLKOUT2 1 FSET/SYNC CLKOUT VDD 1 JU5 4 14 JU12 C18 C19 N4 PGND2 C21 C36 OUT 4 2 PGND CS REF2 3 DL 13 OUT2 R9 C30 R15 R11 3 2 1 AVDD COMP R8 SYNC2 C- 16 D10 VSEL FB 6 5 VDD2 R7 JU8 8 R6 Figure 1. MAX1960 EV Kit Schematic 6 _______________________________________________________________________________________ MAX1960 Evaluation Kit Figure 3. MAX1960 EV Kit PC Board Layout—Component Side Figure 4. MAX1960 EV Kit PC Board Layout—Layer 2 (Ground) _______________________________________________________________________________________ 7 Evaluates: MAX1960/MAX1961/MAX1962 Figure 2. MAX1960 EV Kit Component Placement Guide— Component Side Evaluates: MAX1960/MAX1961/MAX1962 MAX1960 Evaluation Kit Figure 5. MAX1960 EV Kit PC Board Layout—Layer 3 Figure 6. MAX1960 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 © 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.