Evaluates: MAX1522/MAX1523/MAX1524 19-1974 Rev 0 03/01 MAX1522 Evaluation Kit General Description Features The MAX1522 evaluation kit (EV kit) is a fully assembled Input Voltage and tested surface-mount circuit board that contains +1.5V to +5.5V (Left Side, BOOTSTRAPPED) two separate step-up switching controller circuits. The first circuit (left side) utilizes the MAX1524, is config- +2.5V to +5.5V (Right Side, NON- ured for +5V output, and can deliver up to 1A of cur- BOOTSTRAPPED) rent. The MAX1524 supply pin is bootstrapped to the Output Voltage output. The second circuit (right side) utilizes the MAX1522, is configured for +12V output, and can deliv- +5V Output Up to 1A (Left Side) er up to 200mA of current with the input voltage as low +12V Output Up to 200mA (Right Side) as +2.7V. No Current-Sense Resistor The MAX1522 and MAX1524 feature soft-start and fault- detect. The EV kit allows the user to set the on-time of Fault-Detection the N-channel MOSFETs to either 0.5s or 3s. Soft-Start Limits Inrush Current Selectable Maximum Duty Cycle (45% or 80%) Component Suppliers Adjustable Output Voltages SUPPLIER PHONE FAX Fairchild 408-822-2000 408-822-2102 1A (max) Shutdown Current Murata 814-237-1431 814-238-0490 Switching Frequency Up to 1MHz Nihon USA 661-867-2555 661-867-2698 Fully Assembled and Tested Sanyo 619-661-6835 619-661-1055 Sumida 847-956-0666 847-956-0702 Taiyo Yuden 408-573-4150 408-573-4159 Ordering Information TDK 847-803-6100 847-803-6296 PART TEMP. RANGE IC PACKAGE Toshiba 949-455-2000 949-859-3963 MAX1522EVKIT 0C to +70C 6 SOT23 Note: Please indicate that you are using the MAX1522, MAX1523, or MAX1524 when contacting these component suppliers. Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION 100pF, 50V COG ceramic 10F, 6.3V X5R ceramic capacitors (1206) capacitors (0603) C1, C2 2 C6, C7 2 TDK C3216X5R0J106KT or TDK C1608COG1H101JT or Murata GRM39COG101J050AD Taiyo Yuden JMK316BJ106KL 47F 20%, 20V aluminum 47pF, 50V COG ceramic C8 1 electrolytic capacitor C3 1 capacitor (0603) TDK C1608COG1H470JT Sanyo 25CV47AX 33F, 10V Poscap capacitor (C) 330pF, 50V COG ceramic C9 1 Sanyo 10TPA33M capacitor (0603) C4 1 TDK C1608X7R1H331KT or R1 1 301k 1% resistor (0805) Murata GRM39COG331J050AD R2, R4 2 100k 1% resistors (0805) R3 1 866k 1% resistor (0805) 1F, 16V X7R ceramic capacitor (1206) R5 1 10 5% resistor (0805) C5 1 Taiyo Yuden EMK316BJ105KF or 30V, 5.2A N-channel MOSFET TDK C3216X7R1C105KT Fairchild FDC633N (6-pin N1, N2 2 SuperSOT) Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.MAX1522 Evaluation Kit +12.0V Output Circuit Component List (continued) (NONBOOTSTRAPPED) DESIGNATION QTY DESCRIPTION 1) Verify that shunts are across pins 1 and 2 of jumpers JU3 (SET, 3s) and JU4 (SHDN). 2.2A, 30V Schottky diode (SMD) D1 1 2) Connect a +2.5V to +5.5V DC power supply to the Nihon EC31QS03L VIN2 pad. Connect the supply ground to the GND2 1A, 30V Schottky diode (SOT123) pad. D2 1 Toshiba CRS02 or 3) Turn on the power supply. Nihon EP10QY03 4) With a voltmeter, verify that the output voltage 3.3H, 1.44A inductor VOUT2 is +12V. L1 1 Sumida CR43-3R3 For instructions on selecting the feedback resistors for 33H, 0.88A Inductor other output voltages, refer to Evaluating Other Output L2 1 Sumida CDR74B-330 Voltages in this document. MAX1524EUT (6-pin SOT23) Detailed Description U1 1 (Top mark AAOZ) The MAX1522 EV kit is a fully assembled and tested MAX1522EUT (6-pin SOT23) surface-mount circuit board that contains two separate U2 1 (Top mark AAOX) step-up switching controller circuits. JU1JU4 4 3-pin headers The first circuit (left side), labeled BOOTSTRAPPED, uti- None 4 Shunts (JU1JU4) lizes the MAX1524, is configured for +5.0V output, and can deliver up to 1A of current with 3.3V input voltage. None 1 MAX1522 PC board The circuit requires a +1.5V to +5.5V input DC source. None 1 MAX1522 data sheet The MAX1524 V supply is bootstrapped to the output CC None 1 MAX1522 EV kit data sheet to provide +5V gate drive with low input voltages. The device features a fault-detect that reinitiates soft-start whenever the output drops to half of its nominal voltage Quick Start regulation level. The MAX1522 EV kit is fully assembled and tested. The second circuit (right side), labeled NON-BOOT- Follow these steps to verify board operation. Do not STRAPPED, utilizes the MAX1522, is configured for turn on the power supply until all connections are +12V output, and can deliver up to 200mA of current completed. with 2.7V input voltage. The circuit requires a +2.5V to +5.5V input DC source. The MAX1522 is not boot- +5.0V Output Circuit strapped to the output because during regulation the (BOOTSTRAPPED) +12.0V exceeds the maximum supply voltage rating of 1) Verify that shunts are across pins 2 and 3 of jumper the controller. The MAX1522 features a latched fault- JU1 (SET, 0.5s) and pins 1 and 2 of jumper JU2 detect that can be reset by toggling the SHDN pin with (SHDN). the jumper provided on the EV kit. 2) Connect a +2.5V to +5.5V DC power supply to the Each circuit requires an input DC source that can sup- VIN1 pad. Connect the supply ground to the GND1 ply 2A of current. Both ICs implement soft-start to pre- pad. vent excessive input currents during startup. The 3) Turn on the power supply. MAX1522 EV kit also provides jumpers to set the fixed on-time of the N-channel MOSFETs. See Setting the 4) With a voltmeter, verify that the output voltage On-Time section. VOUT1 is +5.0V. For instructions on selecting the feedback resistors for Jumper Selection other output voltages, refer to Evaluating Other Output Shutdown Mode Voltages in this document. The MAX1522 EV kit features 3-pin jumpers (JU2 and JU4) to shut down or power up the BOOTSTRAPPED or NON-BOOTSTRAPPED circuits. Table 1 lists the selec- table jumper options for jumpers JU2 and JU4. 2 Evaluates: MAX1522/MAX1523/MAX1524