19-1218; Rev 2; 2/98 MAX863 Evaluation Kit The MAX863 evaluation kit (EV kit) is an assembled and tested PC board that demonstrates the MAX863 dual, step-up DC-DC controller. The EV kit is factory preset to provide 5V and 3.3V outputs at 700mA and 1.1A, respectively (VIN = 2.4V). Both outputs can also be set to other voltages by pin-strapping or with external resistors. ____________________Component List DESIGNATION QTY C1 1 ____________________________Features ♦ Output Voltages: Preset 5V and 3.3V, or User-Defined ♦ Output Currents: 700mA at 5V, 1.1A at 3.3V (VIN = 2.4V) 350mA at 5V, 600mA at 3.3V (VIN = 1.5V) ♦ Low-Battery Detector ♦ Fully Assembled and Tested ♦ Proven PC Board Layout DESCRIPTION 330µF, 10V tantalum capacitor 0.060Ω max ESR Sprague 594D337X0010R2 C2, C9 2 100µF, 16V tantalum capacitor 0.1Ω max ESR AVX TPSE107M016R0100 C3, C6, C10, C11 0 Open C4 1 10µF, 16V tantalum capacitor C5 ______________Ordering Information PART MAX863EVKIT TEMP. RANGE 0°C to +70°C BOARD TYPE Surface Mount ______________Component Suppliers PHONE FAX AVX (803) 626-3123 1 220µF, 16V tantalum capacitor 0.060Ω max ESR Sprague 594D227X0016R2 (803) 946-0690 (800) 282-4975 Dale (605) 668-4131 (605) 665-1627 International Rectifier (310) 322-3331 (310) 322-3332 C7, C8 1 0.1µF ceramic capacitor IRC (512) 992-7900 (512) 992-3377 D1, D2 2 3A, 40V Schottky diode Motorola MBRS340T3 Motorola (602) 303-5454 (602) 994-6430 JU1–JU5 5 3-pin headers L1, L2 2 10µH, 2.5A inductor Sumida CD75-10uH (2.3A, 0.07Ω) R1, R3, R7, R9 0 Open R2, R4 2 0.050Ω, 1% sense resistor Dale WSL-2010-0.050Ω ±1% or IRC LR2010-R050-F R5 1 165kΩ, 1% resistor R6, R8 2 100kΩ, 1% resistors U1 1 Maxim MAX863EEE U2 1 Dual, logic-level N-channel FET International Rectifier IRF7301 (VT < 0.70V, RDS(ON) = 0.070Ω at 2.7V) None 1 PC board SUPPLIER* Sprague Sumida (603) 224-1961 (603) 224-1430 USA (847) 956-0666 (847) 956-0702 Japan 81-3-3607-5111 81-3-3607-5144 *Please indicate that you are using the MAX863 when contacting these suppliers. _________________________Quick Start This section describes how to operate the MAX863 EV kit and evaluate its performance. Do not turn on the power supply until all connections are completed. 1) Configure the jumpers in accordance with Table 1. 2) Connect a 1.5V to 3.3V DC power supply between the VIN and GND input pads. 3) Turn on the power supply. With no load and the output in regulation, supply current for the board should be less than a few hundred microamperes. 4) Measure the output voltage at OUT1. With FB1 = GND (JU3 = 1-2), OUT1 will be preset to 5V. 5) Measure the output voltage at OUT2. The standard factory setting of R5 = 165kΩ and R6 = 100kΩ sets OUT2 to 3.3V. ________________________________________________________________ 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: MAX863 _______________General Description Evaluates: MAX863 MAX863 Evaluation Kit _Detailed Description of Hardware Adjustable Output Voltage OUT2 must be set with a resistor divider. The EV kit board provides R5 and R6 for this purpose. OUT1 can be set with a resistor divider (R1 and R3) or configured for a preset value (JU3). The EV kit board is preset for a 5.0V output. To configure OUT1 for an adjustable output, open jumper JU3 and then install resistors at sites R1 and R3. Select the resistors according to the following formulas: R1 / R3 = (VOUT1 / VREF) - 1 The EV kit board provides space at C3, C6, C10, and C11 for optional compensation capacitors. Refer to the Set Feedback Compensation section in the MAX863 data sheet for more information. Low-Battery Detector The EV kit board provides pads at R7 and R8 for an optional resistor divider for the low-battery voltage detector. When the voltage at the LBI pin falls below 1.25V, the LBO pin is pulled low. Select the resistors according to the following formula: R7 / R8 = (VLOW / VREF) - 1 where VREF = 1.25V. R5 / R6 = (VOUT2 / VREF) - 1 where VREF = 1.25V. Note: Output capacitors C1 and C5 are rated for 10V and 16V, respectively. For higher output voltages, replace these capacitors. Table 1. Jumper Settings FUNCTION BOOT Pin VDD Select OUT1 Set JUMPER STATE DESCRIPTION 1-2* BOOT = VDD; bootstrapped mode (VIN < 2.7V). If BOOT is high, VDD must be connected to OUT1. 2-3 BOOT = GND; non-bootstrapped mode (VIN > 2.7V). When using a non-bootstrapped circuit configuration, connect BOOT to GND. 1-2* VDD = OUT1; bootstrapped mode (VIN < 2.7V) 2-3 VDD = VIN; non-bootstrapped mode (VIN > 2.7V) 1-2* FB1 = GND; OUT1 set to 5V; R1 and R3 should be open. 2-3 FB1 = VDD; OUT1 set to 3.3V; R1 and R3 should be open. JU1 JU2 JU3 Open OUT1 Shutdown JU4 OUT2 Shutdown JU5 OUT1 determined by R1 and R3 1-2* SHDN1 = VDD; OUT1 enabled 2-3 SHDN1 = GND; OUT1 disabled; OUT1 and OUT2 can be independently disabled. 1-2* SHDN2 = VDD; OUT2 enabled 2-3 SHDN2 = GND; OUT2 disabled * Indicates default factory settings. 2 _______________________________________________________________________________________ GND OUT1 GND 1 C9 100µF 16V C10 OPEN 3 GND U2B IRF7301 3 D1 MBRS340T3 L1 10µH 2.5A C1 330µF 10V VIN FB1 C3 OPEN 5 FB1 OPEN 2 JU3 OPEN 1 V DD R3 2 R1 OUT1 JU2 3 4 R2 0.050Ω 6 V DD BOOT 3 2 JU1 VDD SENSE1 MAX863 U1 C7 0.1µF SHDN2 SHDN1 GND J2-5 J2-6 LBO REF J2-3 J2-4 VDD 9 10 11 12 13 14 15 16 J2-2 EXT2 CS2 SHDN1 FB2 LBI LBO REF SHDN2 C8 0.1µF J2-1 TEST POINTS FB1 4 BOOT 5 CS1 6 EXT1 7 GND 8 PGND 3 2 1 C4 10µF 16V 1 R4 0.050Ω 2 8 1 REF L2 10µH 2.5A C5 220µF 16V D2 IRF7301 MBRS340T3 U2A 7 C6 OPEN 3 JU5 1 SHDN2 2 C2 100µF 16V 3 JU4 1 SHDN1 2 VIN R5 165k 1% R6 100k 1% GND OUT2 R8 100k 1% R7 OPEN R9 OPEN C11 OPEN LBO VIN Evaluates: MAX863 VIN MAX863 Evaluation Kit Figure 1. MAX863 EV Kit Schematic Diagram _______________________________________________________________________________________ 3 Evaluates: MAX863 MAX863 Evaluation Kit 1.0" 1.0" Figure 2. MAX863 EV Kit Component Placement Guide— Component Side 1.0" Figure 3. MAX863 EV Kit Component Placement Guide— Solder Side 1.0" Figure 4. MAX863 EV Kit PC Board Layout—Component Side Figure 5. MAX863 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. 4 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 1998 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.