19-3299; Rev 0; 5/04 MAX1549 Evaluation Kit Features The MAX1549 evaluation kit (EV kit) demonstrates the MAX1549’s standard application circuit. This DC-DC converter steps down high-voltage batteries and/or AC adapters, generating precision low-voltage chipset and RAM power supplies for notebook computers. The MAX1549 EV kit provides a dynamically adjustable 0.7V to 1.5V output voltage range (OUT1), and a fixed 2.5V output voltage (OUT2) from a 5V to 20V battery input range. It delivers up to a 6A output current for OUT1, and up to a 4A output current for OUT2, with greater than 90% efficiency. The EV kit operates at 300kHz switching frequency and has superior line- and load-transient response. ♦ 5V to 20V Input Voltage Range This EV kit is a fully assembled and tested circuit board. It is capable of evaluating other dynamically adjustable output voltages in the 0.5V to 2.0V range by changing R10–R14. Other fixed output voltages in the 0.5V to 2.7V range can be evaluated by changing R20 and R21. ♦ 300kHz Switching Frequency ♦ Four Digitally Selectable Operating Voltages (OUT1) ♦ Dynamically Selectable Output Voltages 0.7V/1.0V/1.3V/1.5V (OUT1, Adjustable from 0.5V to 2.0V) ♦ Fixed 2.5V Output Voltage (OUT2, Adjustable from 0.5V to 2.7V) ♦ 6A Output Current (OUT1) ♦ 4A Output Current (OUT2) ♦ Independent Power-Good Outputs ♦ Low-Profile Components ♦ Fully Assembled and Tested Ordering Information PART TEMP RANGE o MAX1549EVKIT o 0 C to +70 C IC PACKAGE 40 Thin QFN (6mm x 6mm) Component List DESIGNATION QTY C1, C19 0 C2 1 DESCRIPTION 470µF, 2.5V, 6mΩ low-ESR polymer capacitor (E-case) Sanyo 2R5TPD470M6 220µF, 4V, 15mΩ low-ESR capacitor (D-case) Sanyo 4TPE220MF C4, C5 2 10µF ±20%, 25V X5R ceramic capacitors (1812) Taiyo Yuden TMK432BJ106KM or TDK C4532X5R1E106M C6, C7 0 Not installed (1812) 2 0.1µF ±10%, 50V X7R ceramic capacitors (0603) Murata GRM188R71H104K or equivalent C8, C9 C10, C11, C20–C26 0 QTY C12 1 2.2µF, 10V X5R ceramic capacitor (0612) TDK C1632X5R1A225KTB09N C13, C16 2 470pF ±10%, 50V X7R ceramic capacitors (0603) Murata GRM188R71H471K or equivalent C14 1 0.22µF, 16V X5R ceramic capacitor (0805) Taiyo Yuden EMK212BJ224KG 1 1µF ±20%, 10V X5R ceramic capacitor (0805) Taiyo Yuden LMK212BJ105KG or TDK C2012X7R1C105MKT 2 100pF ±5%, 50V C0G ceramic capacitors (0603) Murata GRM1885C1H101J or equivalent Not installed (E-case) 1 C3 DESIGNATION Not installed (0603) C15 C17, C18 DESCRIPTION ________________________________________________________________ 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: MAX1549 General Description MAX1549 Evaluation Kit Evaluates: MAX1549 Component List (continued) DESIGNATION C27, C28 D1, D2 D3 QTY DESCRIPTION 2 10µF ±20%, 6.3V X5R ceramic capacitors (0805) TDK C2012X5R0J106M or Taiyo Yuden AMK212BJ106MG 2 1A, 30V Schottky diodes Nihon EP10QY03 or Toshiba CRS02 1 100mA, 30V dual Schottky diode (SOT23) Central Semiconductor CMPSH-3A DESIGNATION QTY DESCRIPTION R1 1 0.012Ω ±1%, 0.5W resistor (2010) IRC LR2010-01-R012-F or Dale WSL-2010-R012F R2 1 0.015Ω ±1%, 0.5W resistor (2010) IRC LR2010-01-R015-F or Dale WSL-2010-R015F R3–R6, R22, R23 0 Not installed (short PC trace) (0603) R7, R8, R27, R28 4 100kΩ ±5% resistors (0603) R9 1 10Ω ±5% resistor (0805) JU1, JU2, JU6 3 3-pin headers R10, R15–R18 5 100kΩ ±1% resistors (0603) JU3 0 Not installed, 4-pin header R11 1 301kΩ ±1% resistor (0603) JU4, JU5 2 2-pin headers R12 1 487kΩ ±1% resistor (0603) JU1 (1,2) JU2 (1,2) JU6 (1,2) 4 Shunts R13 1 150kΩ ±1% resistor (0603) R14 1 66.5kΩ ±1% resistor (0603) R19, R20, R24, R25, R26, R29, R32 0 Not installed (0603) R21 1 0Ω ±1% resistor (0603) U1 1 MAX1549ETL (40-pin thin QFN 6mm x 6mm) None 4 Rubber bumpers None 1 MAX1549 PC board L1 L2 1 1.5µH, 7A power inductor Sumida CDRH105R-1R5 1 4.7µH, 5.7A power inductor Sumida CDRH124-4R7 N1, N3 2 N-channel MOSFETs (8-pin SO) Fairchild FDS6612A N2, N4 2 N-channel MOSFETs (8-pin SO) Fairchild FDS6670A Component Suppliers SUPPLIER Central Semiconductor Dale-Vishay Fairchild IRC Murata Nihon Sanyo Sumida Taiyo Yuden TDK PHONE 516-435-1110 402-564-3131 408-721-2181 361-992-7900 770-436-1300 847-843-7500 619-661-6835 708-956-0666 800-348-2496 847-390-4373 FAX 516-435-1824 402-563-6296 408-721-1635 361-992-3377 770-436-3636 847-843-2798 619-661-1055 708-956-0702 847-925-0899 847-390-4428 WEBSITE www.centralsemi.com www.vishay.com www.fairchildsemi.com www.irctt.com www.murata.com www.niec.co.jp www.sanyovideo.com www.sumida.com www.t-yuden.com www.component.tdk.com Note: Indicate that you are using the MAX1549 when contacting these component suppliers. Quick Start Equipment Needed • 5V to 20V power supply, battery, or notebook AC adapter 2 • DC bias power supply, 5V at 100mA • Dummy loads capable of sinking 6A • Digital multimeters (DMMs) • 100MHz dual-trace oscilloscope _______________________________________________________________________________________ MAX1549 Evaluation Kit Table 3. Jumpers JU3 Functions (Switching-Frequency Selection) JU3 TON PIN FREQUENCY (kHz) 2) Verify that the shunts are installed across pins 1 and 2 of jumper JU1 (ON1 high), pins 1 and 2 of jumper JU2 (ON2 high), and pins 1 and 2 of JU6 (SKIP high, forced PWM). 1 and 2 Connected to VCC 400 1 and 3 Connected to REF 200 1 and 4 Connected to GND 100 3) Turn on battery power prior to +5V bias power; otherwise, the output UVLO timer times out and the FAULT latch is set, disabling the regulator outputs until +5V power is cycled or ON1/ON2 is toggled. Not Installed (Default) Floating 300 (As Shipped) 4) Verify that the output voltages are V OUT1 = 1.5V, VOUT2 = 2.5V. Detailed Description Note: Do not change the operating frequency without first recalculating component values. The frequency has a significant effect on preferred inductor value, peak current-limit level, MOSFET heating, PFM/PWM switchover point, output noise, efficiency, and other critical parameters. Jumper Settings Table 4. Jumpers JU4 and JU5 Functions (Gate Inputs G0 and G1) Table 1. Jumper JU1 Functions (Output Voltage OUT1 Control) JU1 ON1 PIN JU4 JU5 OUT1 OUT1 enabled, VOUT1 = 1.5V. OUT1 depends on gate inputs G0 and G1. See Table 4. Not Installed G0 = GND Not Installed G1 = GND 1.50V (Default) Installed G0 = VCC Not Installed G1 = GND 1.30V Not Installed G0 = GND Installed G1 = VCC 1.00V Installed G0 = VCC Installed G1 = VCC 0.70V OUT1 1 and 2 (Default) Connected to VCC. 2 and 3 Connected to GND. OUT1 shutdown mode Not Installed ON1 must be driven by an external signal connected to ON1 pad. OUT1 operation depends on the external ON1 signal levels. Table 5. Jumper JU6 Functions (Low-Noise Mode) Table 2. Jumper JU2 Functions (Output Voltage OUT2 Control) JU2 ON2 PIN OUT2 1 and 2 (Default) Connected to VCC. OUT2 enabled, VOUT2 = 2.5V 2 and 3 Connected to GND. OUT2 shutdown mode Not Installed ON2 must be driven by an external signal connected to ON2 pad. OUT2 operation depends on the external ON2 signal levels. JU6 SKIP PIN OPERATIONAL MODE 1 and 2 (Default) Connected to VCC. Low-noise mode, OUT1 and OUT2 are in forced PWM mode. 2 and 3 Connected to GND. OUT1 and OUT2 are in pulse-skipping mode. _______________________________________________________________________________________ 3 Evaluates: MAX1549 Procedure 1) Ensure that the circuit is connected correctly to the supplies and dummy loads prior to applying any power. Evaluates: MAX1549 MAX1549 Evaluation Kit Evaluating Other Dynamic Output Voltages (OUT1) The EV kit output is preset to 0.7V/1.0V/1.3V/1.5V (OUT1). G0 (JU4) and G1 (JU5) gate inputs select the OUT1 voltage (see Table 4). However, OUT1 can also be adjusted between 0.5V and 2.0V by selecting R10– R14 values. Refer to the MAX1549 data sheet Output Voltage section for more information. Evaluating Other Fixed Output Voltages (OUT2) The MAX1549 provides a fixed 2.5V output (OUT2) when FB2 is connected to GND (R20 = open, R21 = 0, R19 = open) or a fixed 1.8V output when FB2 is con- 4 nected to VCC (R20 = open, R21 = open, R19 = 0). OUT2 can also be adjusted from 0.5V to 2.7V by using a resistive voltage-divider formed by R20 and R21 (R19 = open). The MAX1549 regulates FB2 to a fixed reference voltage (0.5V). The adjusted output voltage is: VOUT2 = VFB2(1 + R20 / R21) where VFB2 = 0.5V A 330pF to 1000pF feed-forward bypass capacitor (C26) reduces duty-cycle jitter and feedback noise. Refer to the MAX1549 data sheet for selection of output-capacitor and inductor values for different output voltages. _______________________________________________________________________________________ MAX1549 Evaluation Kit Evaluates: MAX1549 VCC R14 66.5kΩ 1% R13 150kΩ 1% VREF 38 R12 487kΩ 1% 39 40 VDD 3 R9 10Ω VCC 4 C16 470pF C15 1µF 5 R15 VREF 100kΩ 1% CSH1 6 29 C9 0.1µF DH1 VCC N.C. LX1 CC1 5 6 8 7 C4 10µF 25V N1 4 32 31 VIN 20V MAX C6 OPEN 3 1 5 6 7 DL1 8 R29 OPEN D1 N.C. VDD PGND G0 BST2 JU4 8 VCC N.C. 1 1 G1 LX2 9 VCC SKIP 2 VCC DL2 10 R26 OPEN FBLANK VCC 400kHz JU3 2 200kHz 3 1 CSH2 CSL2 OPEN 300kΩ 11 VCC 25 VBIAS +5V 26 C12 2.2µF 22 D3 JU1 VCC JU2 1 2 1 2 12 C8 0.1µF 19 2 5 6 4 7 ON1 OUT2 R32 OPEN C21 OPEN R2 0.015Ω 1% VOUT2 VOUT2 C3 220µF 4V D2 N4 C19 OPEN C27 10µF 6.3V 3 2 C25 OPEN 14 C11 OPEN 15 VCC C24 OPEN PG00D2 18 R4 SHORT (PC TRACE) R3 SHORT (PC TRACE) VCC R19 OPEN 16 VOUT2 3 13 8 R8 100kΩ FB2 C7 OPEN L2 4.7µH 3 2 4 24 C5 10µF 25V N3 5 6 VIN BST1 8 7 21 FSEL PG00D2 GND 3 1 R23 SHORT (PC TRACE) 20 4 100kHz C28 10µF 6.3V VDD 1 R25 R24 OPEN OPEN C2 470µF 2.5V 3 G1 R28 100kΩ C1 OPEN VOUT1 0.7V TO 1.5V AT 6A 2 1 JU5 VREF G0 DH2 R27 100kΩ 28 23 C20 OPEN VOUT1 3 VCC ILIM2 C18 100pF R1 0.012Ω 1% 4 27 JU6 7 GND L1 1.5µH 2 30 U1 MAX1549 ILIM1 VCC ON2 VIN BST1 REF SKIP ON1 C23 OPEN R22 SHORT (PC TRACE) C17 100pF R18 100kΩ 1% VREF BST1 R5 C10 SHORT OPEN (PC TRACE) 36 REFIN R6 SHORT (PC TRACE) C22 OPEN 35 N2 R16 100kΩ 1% R17 VREF 100kΩ 1% OD3 1 GND 2 N.C. VREF C14 0.22µF CSL1 PGOOD1 33 R R11 301kΩ 1% OD2 34 L C13 470pF OUT1 OD1 PGOOD1 R10 100kΩ 1% R7 100kΩ VOUT1 37 17 R21 0Ω VOUT2 R20 OPEN C26 OPEN ON2 3 Figure 1. MAX1549 EV Kit Schematic _______________________________________________________________________________________ 5 Evaluates: MAX1549 MAX1549 Evaluation Kit Figure 2. MAX1549 EV Kit Component Placement Guide—Component Side 6 _______________________________________________________________________________________ MAX1549 Evaluation Kit Evaluates: MAX1549 Figure 3. MAX1549 EV Kit Component Placement Guide—Solder Side _______________________________________________________________________________________ 7 Evaluates: MAX1549 MAX1549 Evaluation Kit Figure 4. MAX1549 EV Kit PC Board Layout—Ground/Signal Layer 2 8 _______________________________________________________________________________________ MAX1549 Evaluation Kit Evaluates: MAX1549 Figure 5. MAX1549 EV Kit PC Board Layout—Ground Plane Layer 3 _______________________________________________________________________________________ 9 Evaluates: MAX1549 MAX1549 Evaluation Kit Figure 6. MAX1549 EV Kit PC Board Layout—Component Side 10 ______________________________________________________________________________________ MAX1549 Evaluation Kit Evaluates: MAX1549 Figure 7. MAX1549 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 ____________________ 11 © 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.