19-2499; Rev 0; 7/02 MAX1999 Evaluation Kit Features ♦ 7V to 24V Input Voltage Range This EV kit can also be used to evaluate the MAX1777 (200kHz/5.0V SMPS and 300kHz/3.3V SMPS) and the MAX1977 (400kHz/5.0V SMPS and 500kHz/3.3V SMPS). ♦ Power-Good (PGOOD) Output ♦ 3.3V and 5V Output Voltages ♦ 2V to 5.5V Adjustable Outputs (External Resistors) ♦ 5A Output Current (3.3V Output) ♦ 5A Output Current (5V Output) ♦ No Current-Sense Resistor Needed (MAX1999) ♦ Accurate Current Sense with Current-Sense Resistor (MAX1777/MAX1977) ♦ 200kHz/300kHz Switching Frequency (5V/3.3V, Respectively) ♦ Fault Protection Enable/Disable ♦ 28-Pin QSOP Package ♦ Low-Profile Components ♦ Fully Assembled and Tested Ordering Information PART TEMP RANGE MAX1999EVKIT 0oC to +70oC IC PACKAGE 28 QSOP Note: To evaluate the MAX1777/MAX1977, request a MAX1777EEI/MAX1977EEI free sample with the MAX1999EVKIT. Component List DESIGNATION QTY C1, C2, C3 3 DESCRIPTION 10µF, 25V ceramic capacitors (1812) Taiyo Yuden TMK432BJ106KM or TDK C4532X5R1E106M C4 0 Not installed (1812) C5, C7 0 Not installed, D case 1 470µF, 4V, 40mΩ, low-ESR capacitor, D case Sanyo 4TPB470M C6 C8 1 330µF, 6.3V, 40mΩ, low-ESR capacitor, D case Sanyo 6TPB330M C9, C10, C12, C15 4 0.1µF ceramic capacitors (0805) 2 1µF, 10V X5R ceramic capacitors (0805) Taiyo Yuden LMK212BJ105KG or TDK C2012X5R105M C11, C24 DESIGNATION QTY DESCRIPTION C13, C14 0 Not installed C16 1 0.22µF, 16V X5R ceramic capacitor (0805) Taiyo Yuden EMK212BJ224KG C17 1 4.7µF, 35V tantalum capacitor, C case Sprague 595D475X0035C2B C18, C19 2 4.7µF, 16V tantalum capacitors, A case Sprague 595D475X0016A2B D1 1 100mA, 30V dual Schottky diode Central Semiconductor CMPSH-3A D2, D3 2 1A, 30V Schottky diodes Nihon EP10QY03 Toshiba CRS02 JU1, JU2 2 3-pin headers JU3, JU5 2 4-pin headers ________________________________________________________________ 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: MAX1777/MAX1977/MAX1999 General Description The MAX1999 evaluation kit (EV kit) demonstrates the MAX1999’s standard application circuit. This DC-DC converter steps down high-voltage batteries and/or AC adapters, generating system supplies for notebook computers. The MAX1999 EV kit provides dual 5V and 3.3V output voltages from a 7V to 24V battery input range. It delivers up to 5A output current for the 5V output and 5A for the 3.3V output with greater than 90% efficiency. The EV kit operates at 200kHz/300kHz switching frequency (5V/3.3V, respectively) and has superior line-and-loadtransient response. This EV kit is a fully assembled and tested circuit board. It allows the evaluation of other output voltages in the 2V to 5.5V range by changing feedback resistors R1–R4. Evaluates: MAX1777/MAX1977/MAX1999 MAX1999 Evaluation Kit Component List (continued) DESIGNATION QTY DESCRIPTION L1 1 7.6µH, 5.9A power inductor Sumida CDRH127-7R6 L2 1 4.7µH, 5.7A power inductor Sumida CDRH124-4R7 2 N-channel MOSFET, 8-pin SO International Rectifier IRF7807V or Fairchild FDS6612A N1, N3 N2, N4 2 N-channel MOSFET, 8-pin SO International Rectifier IRF7811AV or Fairchild FDS6670A R1, R3, R10–R14 0 Not installed (0805) R2, R4 0 Not installed, short PC trace (0805) R5 1 3.9Ω ±5% resistor (1206) DESIGNATION QTY DESCRIPTION R6 1 100kΩ ±5% resistor (0805) R7, R9 2 1MΩ ±5% resistors (0805) R8, R18 2 10Ω ±5% resistors (0805) R15, R16 0 Not installed, short PC trace (2010) R17 1 47Ω ±5% resistor (0805) MAX1999EEI, 28-pin QSOP U1 1 None 4 Shunts (JU1, JU2, JU3, JU5) None 4 Rubber feet None 1 MAX1999 PC board None 1 MAX1999 data sheet None 1 MAX1999 EV kit data sheet Component Suppliers SUPPLIER PHONE FAX WEBSITE Central Semiconductor 516-435-1110 516-435-1824 Fairchild 408-721-2181 408-721-1635 www.fairchildsemi.com International Rectifier 310-322-3331 310-322-3332 www.irf.com Nihon 847-843-7500 847-843-2798 www.niec.co.jp www.centralsemi.com Sanyo 619-661-6835 619-661-1055 www.sumida.com Sprague/Vishay 270-324-4140 270-490-7222 www.vishay.com Sumida 708-956-0666 708-956-0702 www.sumida.com Taiyo Yuden 408-573-4150 408-573-4159 www.t-yuden.com TDK 847-390-4373 847-390-4428 www.component.tdk.com Note: Please indicate that you are using the MAX1999 when contacting these component suppliers. Recommended Equipment • 7V to 24V power supply, battery, or notebook AC adapter • Dummy loads capable of sinking 5A • Digital multimeters (DMMs) • 100MHz dual-trace oscilloscope 2) Verify that the shunts are across JU1 pins 1 and 2, JU2 pins 1 and 2, JU3 pins 1 and 4, and JU5 pins 1 and 4. 3) Turn on the power supply. 4) Verify that the output voltages are 3.3V and 5V. Evaluating Other Output Voltages Quick Start 1) Ensure that the circuit is connected correctly to the supplies and dummy load before applying any power. The EV kit outputs are preset to 3.3V and 5V. However, the output voltages can also be adjusted between 2V and 5.5V by selecting R1/R2 and R3/R4 values. Select feedback resistors R2 and R4. R1 and R3 are then given by: R1 (or R3) = R2 (or R4) x [(VOUT/VFB) - 1] where VFB = 2V. 2 _______________________________________________________________________________________ MAX1999 Evaluation Kit Evaluates: MAX1777/MAX1977/MAX1999 VCC VIN 7V TO 24V R13 OPEN VCC REF R5 3.9Ω GND R11 OPEN JU8 R12 OPEN VCC JU7 R14 OPEN LD05 +5V V+ VOUT2 +5V, 5A 5 6 N1 3 2 1 C7 OPEN 14 BST5 D3 6 15 11 18 ILIM5 LDO5 U1 BST3 MAX1999 (MAX1777) (MAX1977) LX5 DH3 19 13 1 VCC R10 OPEN R16 SHORT (PC TRACE) 28 R18 10Ω 2 1 JU5 1 C18 4.7µF 16V BST5 5 26 4 C10 0.1µF 27 1 C14* OPEN 5 DL3 TON (CS5) N.C. (CS3) 24 6 N3 3 2 7 8 C4 OPEN 4 ON5 OUT3 5V ON/OFF FB3 C5 OPEN D2 1 C6 470µF 4V 2 R15 SHORT (PC TRACE) 2 VOUT1 3.3V, 5A L2 4.7µH N4 3 4 1 C3 10µF 25V 8 7 6 R7 1MΩ 4 3 C11 1µF 10V DL5 JU6 REF D1 17 C24 1µF 10V BST5 3 R17 VCC 47Ω DH5 LX3 4 2 5 ILIM3 C13* OPEN 5 N2 3 R3 OPEN R8 10Ω C9 0.1µF 8 7 V+ VCC 16 4 L1 7.6µH C8 330µF 6.3V 8 L 8 7 20 C15 0.1µF R C2 10µF 25V C1 10µF 25V C17 4.7µF 35V R1 OPEN 22 7 VCC 21 9 R4 SHORT (PC TRACE) VCC R2 SHORT (PC TRACE) OUT5 FB5 R6 100kΩ VCC 3.3V ON/OFF PGOOD SKIP 4 REF JU3 1 3 3 ON3 GND SHDN PRO 2 PGOOD 1 12 2 JU2 3 VCC 23 2 V+ SHDN 1 2 JU4 JU1 6 LD03 REF 3 10 8 R9 1MΩ 25 LD03 3.3V REF 2V C16 0.22µF C12 0.1µF *OPTIONAL C13 AND C14 REQUIRED FOR ULTRASONIC MODE OPERATION (MAX1999 ONLY). SEE TABLE 2. C19 4.7µF 16V Figure 1. MAX1999 EV Kit Schematic Evaluating the MAX1777/MAX1977 This EV kit also can be used to evaluate the MAX1777/ MAX1977. The MAX1777 operates at 200kHz/300kHz switching frequency and the MAX1977 operates at 400kHz/500kHz switching frequency (5V/3.3V). The MAX1777 and the MAX1977 use accurate currentsense resistors, R15 and R16: 1) Remove the MAX1999 and install a MAX1777 or MAX1977. 2) Cut open the traces shorting sense resistors R15 and R16. 3) Install sense resistors R15 and R16. 4) Short resistor R10 (leave JU6 open). _______________________________________________________________________________________________________ 3 Evaluates: MAX1777/MAX1977/MAX1999 MAX1999 Evaluation Kit Jumper Settings Table 1. Jumper JU1 Functions (SHDN Mode Selection) SHDN PIN JU1 MAX1999 OUTPUT 1 and 2 Connected to V+ MAX1999 enabled; REF, LDO3, and LDO5 active; VOUT1 (3.3V) depends on JU3; VOUT2 (5.0V) depends on JU5 2 and 3 Connected to GND Shutdown mode; REF, LDO3, and LDO5 off; VOUT1 = 0V and VOUT2 = 0V Connected to SHDN pad MAX1999 can be driven by an external signal Not installed Table 2. Jumper JU2 Functions (SKIP Mode Selection) SKIP PIN JU2 OPERATING MODE 1 and 2 Connected to VCC Low-noise mode, forced fixed-frequency PWM operation. 2 and 3 Connected to GND Normal operation, allows automatic PWM/PFM switchover for pulse-skipping at light load, resulting in highest efficiency. Floating Ultrasonic pulse-skipping mode (20kHz min). Install C13, C14 (470pF) for MAX1999 ultrasonic mode operation to ensure proper negative ultrasonic current sensing (VNEG(µs)). Not installed Table 3. Jumper JU3 Functions (Output Voltage VOUT1 Control) JU3 ON3 PIN OUTPUT VOLTAGE (VOUT1) 1 and 2 Connected to GND VOUT1 = 0V, disabled 1 and 3 Connected to REF (ON5 = VCC) VOUT1 (3.3V) starts after VOUT2 (5V) reaches regulation 1 and 4 Connected to VCC VOUT1 = 3.3V, enabled Table 4. Jumper JU4 Functions (Protection Selection) JU4 Installed Not installed 4 PRO PIN PROTECTION Connected to VCC Undervoltage and overvoltage fault protection are disabled. Connected to GND through resistor R9 Undervoltage and overvoltage fault protection are enabled. Refer to the Fault Protection section in the MAX1999 data sheet for more information. _______________________________________________________________________________________ MAX1999 Evaluation Kit Table 5. Jumper JU5 Functions (Output Voltage VOUT2 Control) JU5 ON5 PIN OUTPUT VOLTAGE (VOUT2) 1 and 2 Connected to GND VOUT2 = 0V, disabled 1 and 3 Connected to REF (ON3 = VCC) VOUT2 (5V) starts after VOUT1 (3.3V) reaches regulation 1 and 4 Connected to VCC VOUT2 = 5V, enabled Table 6. Jumper JU6 Functions (Switching-Frequency Selection) JU6 TON PIN Not installed Installed FREQUENCY (kHz) Connected to VCC through resistor R7 200/300 (as shipped) Connected to GND 400/500 Important: Do not change the operating frequency without first recalculating component values. The switching frequency has a significant effect on the peak current-limit level, MOSFET heating, preferred inductor value, PFM/PWM switchover point, output noise, efficiency, and other critical parameters. Table 7. Jumper JU7 Functions (Fixed/Adjustable Current-Limit Selection for VOUT2) JU7 ILIM5 PIN SHORT Connected to VCC through a PC board trace. 100 (default) Connected to REF through resistor-divider R13/R14. Refer to the Current-Limit Circuit section in the MAX1999 data sheet for information on selecting R13/R14. Adjustable from 50 to 200 OPEN CURRENT-LIMIT THRESHOLD (mV) Table 8. Jumper JU8 Functions (Fixed/Adjustable Current-Limit Selection for VOUT1) JU8 ILIM3 PIN CURRENT-LIMIT THRESHOLD (mV) SHORT Connected to VCC through a PC board trace. 100 (default) OPEN Connected to REF through resistor-divider R11/R12. Refer to the Current-Limit Circuit section in the MAX1999 data sheet for information on selecting R11/R12. Adjustable from 50 to 200 _______________________________________________________________________________________ 5 Evaluates: MAX1777/MAX1977/MAX1999 Jumper Settings (continued) Evaluates: MAX1777/MAX1977/MAX1999 MAX1999 Evaluation Kit Figure 2. MAX1999 EV Kit Component Placement Guide— Top Silkscreen 6 Figure 3. MAX1999 EV Kit PC Board Layout—Component Side _______________________________________________________________________________________ MAX1999 Evaluation Kit Evaluates: MAX1777/MAX1977/MAX1999 Figure 4. MAX1999 EV Kit PC Board Layout—Ground Layer 2 Figure 5. MAX1999 EV Kit PC Board Layout—Ground Layer 3 _______________________________________________________________________________________ 7 Evaluates: MAX1777/MAX1977/MAX1999 MAX1999 Evaluation Kit Figure 6. MAX1999 EV Kit PC Board Layout—Solder Side Figure 7. MAX1999 EV Kit Component Placement Guide— Bottom Silkscreen 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 © 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. This datasheet has been download from: www.datasheetcatalog.com Datasheets for electronics components.