ISL97656IRTZEVALZ Renesas

USERS MANUAL ISL97656IRTZEVALZ AN1473 Rev 1.00 Evaluation Board May 10, 2010 The ISL97656IRTZEVALZ is an evaluation kit for evaluating Quick Setup Guide the ISL97656, a step-up voltage regulator that operates with 1. Connect power supply between headers of V and IN high frequency and high efficiency. This evaluation kit is V . The positive output of the power supply should IN GND designed to deliver up to 2A output current for portable header. Set power supply voltage be connected to V IN equipment and TFT-LCD display. between 2.3V and 5V, and current limit at 4A. 2. Connect E-load between headers of V and The ISL97656IRTZEVALZ evaluation kit provides a dip OUT OUT GND. The positive input of the E-load should be switch that allows users to select either 620kHz or 1.2MHz connected to V header. Set E-load current. The load OUT frequency. current should not exceed the maximum output current in Table 1. Key Features 3. Close pins 1 and 4 of S1 to tie FREQ pin to V to set IN A Complete Evaluation Platform for the ISL97656 1.25MHz switching frequency. Open pins 1 and 4 to pull Evaluation to set 620kHz. FREQ to ground with R 4 Input Voltage: 2.3V to 5.5V 4. Close pins 2 and 3 of S1 to tie EN pin to V to enable the IN part. Open pins 2 and 3 to pull EN to ground with R to 3 Proven Evaluation Board Layout disable the part. Pb-Free (RoHS Compliant) 5. Make sure all the connections on the evaluation board are correct, then turn on power supply and E-load. The What is Needed part starts to operate. The following instruments will be needed to perform testing: Maximum Output Current Power Supplies The MOSFET current limit is normally 4A and guaranteed DC Electronic Load 3.8A. This restricts the maximum output current that the ISL97656 can drive.Table 1 shows typical maximum I Multimeters OUT values for 1.2MHz switching frequency and 10H inductor. Oscilloscope TABLE 1. TYPICAL MAXIMUM I VALUES OUT Cables and Wires V V I IN OUT OMAX Pinout (V) (V) (mA) 2.5 5 1790 ISL97656 (10L TDFN) 2.5 9 990 TOP VIEW 2.5 12 750 3.3 5 2370 COMP SS 1 10 3.3 9 1300 2 9 FB FREQ 3.3 12 970 EN 3 8 IN 5 9 1970 4 7 GND LX 5 12 1470 LX 6 GND 5 Ordering Information PART NUMBER DESCRIPTION ISL97656IRTZEVALZ Evaluation Board for ISL97656 AN1473 Rev 1.00 Page 1 of 5 May 10, 2010ISL97656IRTZEVALZ Board Design Schematic R4 10k S1 1 4 2 3 SW DIP-2 R5 10k 4700pF 1k C6 C4 ISL97656 R3 27nF 1 10 COMP SS C2 2 9 FB FREQ VIN (2.3V to 5.5V) 0.1F 10k 3 8 EN IN 1 R2 R1 C1 88.7k 4 7 CON1 GND LX 22F 5 6 GND LX V (12V) D1 OUT ISL97656 L1 1 10H C3 CON1 FY0504SA C7 22F CAP GNDIN 1 CON1 NOTE: The thermal pad should connect to signal ground. Both grounds should connect at pins 4 and 5. FIGURE 1. SCHEMATIC TABLE 2. ISL97656IRTZEVALZ BILL OF MATERIALS (BOM) ITEM QTY REFERENCE PART DESCRIPTION PCB FOOTPRINT PART NUMBER VENDOR 1 1 C4 27nF 603 TDK 2 1 C6 4700pF 603 TDK 3 1 C2 0.1F/16V 603 C1068X7R1H104K TDK 4 1 R1 88.7k 603 WALSIN 5 3 R2, R4, R5 10k 603 WR06W1002JTL WALSIN 6 1 R3 1k 603 8 1 C3 22F 1206 GRM31CR61C226KE15L MURATA 9 1 C1 22F 1206 GRM31CR61C226KE15L MURATA 10 1 L1 10H SLF12575 SLF12575T-100M5R4-PF TDK 11 1 U1 IC TDFN-10 ISL97656 INTERSIL 12 OPEN C7 CAP 13 1 VOUT (12V) CON1 Powerpost 14 1 VIN (2.3V to 5.5V) CON1 Powerpost 15 1 GNDIN CON1 Powerpost 16 1 D1 FYD054SA DPAK FYD0504SATM Fairchild 17 1 ISL97656 ISL97656 TDFN-10 INTERSIL 18 1 S1 SW DIP-2 DIP4 CKN3001-ND AN1473 Rev 1.00 Page 2 of 5 May 10, 2010