MAX774 EV Kit 19-0223 Rev 0 1/94 MAX774 Evaluation Kit General Description Features The MAX774 evaluation kit (EV kit) is a fully assembled -5.0V or Adjustable Output Voltage and tested surface-mount printed circuit board that pro- Up to 1A Output Current vides a regulated -5.0V output voltage from a +5.0V input source. It drives loads up to 1A with conversion 5A Max Shutdown Current efficiency greater than 80%. 100A Max Supply Current Additional pads are provided on the boards solder side to accommodate external feedback resistors for 300kHz Switching Frequency setting different output voltages. 8-Pin DIP and SO Packages The MAX774 EV kit can also be used to evaluate the Surface-Mount Construction MAX775 (-12V output) or MAX776 (-15V output). Fully Assembled and Tested Component List DESIGNATION QTY DESCRIPTION 150F, 10V low-ESR tantalum capacitor Ordering Information C1 1 Sprague 595D157X0010D7 330F, 10V low-ESR tantalum capacitor PART TEMP. RANGE BOARD TYPE C3 1 Sprague 595D337X0010R7 MAX774EVKIT-SO 0C to +70C Surface Mount C2, C4 2 0.1F, 50V ceramic capacitors 0.075 resistor (low inductance) R1 1 IRC LR2010-01-R075-F R2, R3 0 Open 22H, 2.3A power inductor EV Kit L1 1 Sumida CDR125-220 3A Schottky diode D1 1 1N5820 or Nihon NSQ03A03 P-channel FET (BV = 30V, r = DS DS(ON) Q1 1 130m at 4.5V , Siliconix Si9435 GS) U1 1 MAX774CSA (8-pin SO) JU1 1 3-pin header None 1 Shunt None 1 PC board None 1 MAX774 data sheet Component Suppliers SUPPLIER PHONE FAX AVX (800) 282-4975 (207) 283-1941 Coilcraft (708) 639-6400 (708) 639-1469 Coiltronics (407) 241-7876 (407) 241-9339 Harris (407) 724-3739 (407) 724-3937 IRC (704) 264-8861 (704) 264-8866 Matsuo (714) 969-2491 (714) 960-6492 Motorola (800) 521-6274 (602) 244-4015 Nihon (805) 867-2555 (805) 867-2556 Siliconix (408) 988-8000 (408) 970-3950 Sprague (603) 224-1961 (603) 224-1430 Sumida (708) 956-0666 (708) 956-0702 Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.MAX774 Evaluation Kit Quick Reference Detailed Description The MAX774 EV kit is a fully assembled and tested sur- Jumper Selections face-mount board. Follow the steps below to verify The 3-pin header JU1 selects shutdown mode. Table 1 board operation. lists the selectable jumper options. Do not turn on the power supply until all connec- Inductor Selection tions are completed. The 22H Sumida CDR125-220 inductor mounted on 1. Connect a +5.0V supply to the pad marked VIN. the EV kit is a low-resistance, shielded, medium-current Ground connects to the GND pad. inductor. It provides excellent performance over the line and load ranges of the MAX774/MAX775/MAX776. 2. Connect a voltmeter and load (if any) to the VOUT See the Choosing an Inductor section of the pad. MAX774/MAX775/MAX776 data sheet for more inductor 3. Place the shunt on JU1 across pins 1 and 2 for selection information. normal operation. Table 1. Jumper JU1 Functions 4. Turn on the power and verify the output voltage is -5.0V. SHUNT LOCATION SHDN PIN MAX774 OUTPUT 5. Refer to the sections Evaluating the MAX775 and Shutdown mode, 2 & 3 Connected to VIN MAX776 and Other Output Voltages to modify the VOUT = 0V board for different output voltages. MAX774 enabled, 1 & 2 Connected to GND VOUT = -5.0V V IN 3V TO 16V * C1 C2 3 150F 0.1F JU1 10V 2 5 3 V+ SHDN U1 SHDN 1 R1 MAX774 0.075 4 6 CS REF Q1 C4 Si9435 R3 7 EXT 0.1F P 0 (SHORT) D1 V = 5V OUT 2 1 FB OUT GND 1N5820 8 C3 L1 330F 22H 10V R2 OPEN FOR INPUTS ABOVE 10V, USE A HIGHER WORKING VOLTAGE C1. * Figure 1. MAX774 EV Kit Schematic Diagram 2 MAX774 EV Kit