19-2352; Rev 0; 2/02 MAX1846 Evaluation Kit Features ♦ 3V to 16.5V Input Range ♦ MAX1846 Circuit Configured for +12V Into -5V at 2A ♦ MAX1847 Circuit Configured for +3.3V Into -12V at 400mA ♦ Evaluates Both the MAX1846 and MAX1847 Independently ♦ Fully Assembled and Tested Ordering Information PART MAX1846EVKIT TEMP RANGE IC PACKAGE -40°C to +85°C 10 µMAX 16 QSOP Component List DESIGNATION C1, C11 C2, C3, C4 C5 C6, C16 C7, C8 C9, C19 C10 C12, C13, C14 C15 QTY DESCRIPTION 2 0.47µF ±10%, 25V, X7R ceramic capacitors (0805) Murata GRM40X7R474K025AL DESIGNATION QTY DESCRIPTION C17, C18 2 100µF ±20%, 10V POSCAPs Sanyo 10TPB100M C20 1 3 22µF ±20%, 10V, X5R ceramic capacitors (1812) Taiyo Yuden LMK432BJ226MM 390pF ±10%, 50V COG ceramic capacitor (0805) Murata GRM40COG391K050AL C21, C22 2 1 0.22µF ±10%, 25V, X7R ceramic capacitor (0805) Murata GRM40X7R224K025AL 1000pF ±10%, 50V COG ceramic capacitors (0805) Murata GRM40COG102K050AL D1, D2 2 2 220pF ±10%, 50V COG ceramic capacitors (0805) Murata GRM40COG221K050AL 5A, 40V Schottky diodes (SMC) Central Semiconductor CMSH5-40 2 47µF ±20%, 16V POSCAPs Sanyo 16TPB47M 2 0.1µF ±10%, 50V, X7R ceramic capacitors (0805) Taiyo Yuden UMK212BJ104KG 1 1200pF ±10%, 50V COG ceramic capacitor (0805) Murata GRM40COG122K050AL 3 1 10µF ±20%, 25V, X5R ceramic capacitors (1812) Taiyo Yuden TMK432BJ106MM 0.047µF ±10%, 25V, X7R ceramic capacitor (0805) Murata GRM40X7R473K025AL JU1, JU2 2 Jumpers, SIP3, 3-pin headers JU1, JU2 2 Shunts L1, L2 2 10µH, 10A power inductors Coilcraft DO5022P-103 or Coiltronics UP4B-100 P1 1 -8.0A, -20V P-channel MOSFET Fairchild FDS6375 (SO-8) P2 1 -8.8A, -30V P-channel MOSFET Fairchild FDS6685 (SO-8) R1 1 0Ω ±5% resistor (0805) R2, R9 2 22kΩ ±5% resistors (0805) R3 1 10kΩ ±5% resistor (0805) R4, R11 2 150kΩ ±5% resistors (0805) ________________________________________________________________ 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: MAX1846/MAX1847 General Description The MAX1846 evaluation kit (EV kit) contains both the MAX1846 and MAX1847. Both devices are inverting, current-mode, constant-frequency PWM controllers. The MAX1846 circuit is configured for a +12V input and a -5V output at 2A. The MAX1847 circuit is configured for a +3.3V input and a -12V output at 400mA. Each circuit is powered separately so there is no interaction between the two circuits. The MAX1846 is available in a 10-pin µMAX package and the MAX1847 is available in a 16-pin QSOP package. The MAX1846 EV kit is a fully assembled and tested surface-mount circuit board. With minimal modification, it can also be used to evaluate other output voltages. Evaluates: MAX1846/MAX1847 MAX1846 Evaluation Kit Component List (continued) DESIGNATION QTY DESCRIPTION R5, R12 2 20mΩ 1W ±1% sense resistors (2512) Dale WSL-2512-R020-F R6 1 95.3kΩ ±1% resistor (0805) R7, R14 2 10kΩ ±1% resistors (0805) R8 1 Not installed (0805) R10 1 8.2kΩ ±5% resistor (0805) R13 1 40.2kΩ ±1% resistor (0805) R15, R16 2 100Ω ±5% resistors (0805) U1 1 MAX1847 (16-pin QSOP) U2 1 MAX1846 (10-pin µMAX) None 1 MAX1846 data sheet None 1 MAX1846 EV kit data sheet Quick Start The MAX1846 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. MAX1847 Output (-12V) 1) Verify that a shunt is across pins 1 and 2 of jumper JU1 (SHDN). 2) Verify that a shunt is across pins 2 and 3 of jumper JU2 (SYNC). 3) Connect a voltmeter to the VOUT pad. 4) Preset a 3V to 5.5V DC power supply to 3V. Turn off power supply. This power supply should be able to supply 3A continuous current. 5) Connect the power supply to the VIN pad. Connect the supply ground to the GND pad. 6) Connect a load up to 400mA between VOUT and GND. 7) Turn on the power supply and gradually increase the input voltage through the 3V to 5.5V range. 8) Verify that VOUT is -12V throughout the +3V to +5.5V input voltage range. Component Suppliers SUPPLIER AVX PHONE WEBSITE Capacitors 803-946-0690 www.avxcorp.com Diodes 516-435-1110 www.centralsemi.com Coilcraft Inductors 847-639-6400 www.coilcraft.com Coiltronics (Cooper) Inductors 561-752-5000 www.cooperet.com Dale Resistors 402-564-3131 www.vishay.com/brands/dale/main.html Fairchild MOSFETs 408-721-2181 www.fairchildsemi.com International Rectifier MOSFETs 310-322-3331 www.irf.com IRC Resistors 512-992-7900 www.irctt.com Capacitors 864-963-6300 www.kemet.com Murata Capacitors 770-436-1300 www.murata.com Panasonic Capacitors Resistors 201-348-7522 www.panasonic.com Sanyo Capacitors 619-661-6835 www.secc.co.jp Sprague Capacitors 603-224-1961 www.vishay.com/brands/sprague/main.html Sumida Inductors 847-956-0666 www.remtechcorp.com Capacitors 800-368-2496 www.t-yuden.com Resistors 203-268-6261 www.vishay.com/brands/vitramon/main/html Central Semiconductor Kemet Taiyo Yuden Vitramon 2 COMPONENT _______________________________________________________________________________________ MAX1846 Evaluation Kit 2) Connect a “turned off” 12.0V DC power supply to the VIN1 pad. This power supply should be able to supply 2A continuous current. 3) Connect the supply ground to the GND pad. 4) Connect a load up to 2A between VOUT1 and GND. 5) Turn on the power supply and verify that VOUT1 is -5V. Detailed Description The MAX1846 EV kit contains two high-efficiency, PWM inverting controllers. The MAX1846 is configured to convert a +12V input to a -5V output and is capable of delivering up to 2A of current. The MAX1847 is configured to convert a +3V to +5.5V input to -12V and will deliver in excess of 400mA depending on the input voltage. Both devices are inverting, current-mode, constant-frequency PWM controllers capable of operating at frequencies from 100kHz to 500kHz with a simple resistor change (R4 and R11). The EV board is configured to operate at 300kHz. Note that for optimum efficiency and stability, other components may need to be optimized, depending on the operating frequency selected. Refer to the MAX1846/MAX1847 data sheet for more information. The MAX1847 can be synchronized to an external clock signal in the same frequency range and also has a shutdown feature. The MAX1846 is in an ultra-compact 10-pin µMAX package and the MAX1847 is in a 16-pin QSOP package. Jumper Selection Shutdown Mode The MAX1847 features a shutdown mode that reduces quiescent current. The 3-pin jumper (JU1) selects the shutdown mode for the MAX1847. To enable the MAX1847 shutdown mode, connect pins 2 and 3 on JU1 with the supplied shunt. For normal operation, connect pins 1 and 2. Synchronized Mode The MAX1847 features a synchronized mode that enables the operating frequency to be controlled by an external clock. To utilize the synchronized mode, remove the shunt on jumper JU2 connecting pins 2 and 3 and place it on pins 1 and 2. Connect an external frequency source to the SYNC pad. The external frequency source must be a TTL level and have a 20% to 80% duty cycle. Note: The value of R4 must program an internal oscillator frequency lower than the frequency of the external clock. Refer to the MAX1846/MAX1847 data sheet for more information. _______________________________________________________________________________________ 3 Evaluates: MAX1846/MAX1847 MAX1846 Output (-5V) 1) Connect a voltmeter to the VOUT1 pad. Evaluates: MAX1846/MAX1847 MAX1846 Evaluation Kit 12V VIN1 GND C13 10µF 25V C12 10µF 25V R8 OPEN 1 VL C11 0.47µF C14 10µF 25V R9 22kΩ 10 IN EXT 4 9 23 1 P2 5 678 R10 8.2kΩ C15 0.047µF -5V AT 2A VOUT1 3 COMP U2 C16 220pF MAX1846 CS 8 C22 1000pF 2 4 R11 150kΩ D2 C19 0.1µF PGND FREQ FB REF GND 6 R16 100Ω C17 100µF 10V L2 10µH C18 100µF 10V GND R12 0.02Ω 1W 1% R13 40.2kΩ 1% 7 5 C20 390pF R14 10kΩ 1% Figure 1. MAX1846 EV Kit Schematic 4 _______________________________________________________________________________________ MAX1846 Evaluation Kit Evaluates: MAX1846/MAX1847 3V TO 5.5V VIN C3 22µF 10V C2 22µF 10V GND C4 22µF 10V R1 0Ω R2 22kΩ C1 0.47µF 2 VL 15 IN 1 2 3 8 JU1 SHDN EXT 4 14 1 23 P1 SYNC 1 2 3 16 JU2 56 78 SYNC U1 R3 10kΩ C5 0.22µF 4 MAX1847 COMP C6 220pF CS N.C. N.C. 3 5 R4 150kΩ FREQ PGND R15 100Ω 13 9 7 C21 1000pF D1 -12V AT 400mA VOUT C7 47µF 16V L1 10µH R5 0.02Ω 1W 1% C8 47µF 16V GND R6 95.3kΩ 1% 12 REF C9 0.1µF FB POL 1 GND GND 10 11 6 C10 1200pF R7 10kΩ 1% Figure 2. MAX1847 EV Kit Schematic _______________________________________________________________________________________ 5 Evaluates: MAX1846/MAX1847 MAX1846 Evaluation Kit Figure 3. MAX1846 EV Kit Component Placement Guide— Component Side Figure 4. MAX1846 EV Kit PC Board Layout—Component Side Figure 5. MAX1846 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. 6 _____________________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.