USERS MANUAL ISL8022EVAL2Z AN1587 Rev 1.00 Dual 2A/1.7A Low Quiescent Current 2.25MHz High Efficiency Synchronous Buck Aug 10, 2010 Regulator TABLE 1. BILL OF MATERIALS Description REFERENCE The ISL8022EVAL2Z kit is intended for use by DESIGNATOR DESCRIPTION MFR MFR PART individuals with requirements for Point-of-Load applications sourcing from 2.8V to 5.5V. The PWB-PCB, TBD ISL8022EVAL2ZREVAPCB ISL8022EVAL2Z, ISL8022EVAL2Z evaluation board is used to demonstrate REVA, ROHS the performance of the ISL8022 low quiescent current C2, C4 CAP, SMD, 0805, TDK C2012X5R0J226M mode converter. 22F, 6.3V, 20%, The ISL8022 is offered in a 4mmx3mm 12 Ld DFN X5R, ROHS package with 1mm maximum height. The complete C1, C8 CAPACITOR, MURATA GRM21BR60J106KE01L 2 converter occupies less than 0.175in area. SMD, 0805, 10F, 6.3V, 10%, X5R Key Features C6, C7 CAP, SMD, 0805, Dual 2A/1.7A High Efficiency Synchronous Buck DNP-PLACE Regulator with up to 97% Efficiency HOLDER, ROHS 180 Out-of-Phase C3, C5 CAP-RF HIQ, JOHANSON 500R07S100JV4T Power-Goods (PG) Output with 1ms Delay SMD, 0402, TECH. 2.8V to 5.5V Supply Voltage 10pF, 50V, 5%, COG, ROHS 3% Output Accuracy Over-temperature/Load/Line L1, L2 COIL-PWR TDK VLCF4028T-1R2N2R7-2 Start-up with Pre-biased Output INDUCTOR, WW, 40A Quiescent Supply Current in PFM Mode SMD, 4mm, Selectable Forced PWM Mode and PFM Mode 1.2H, 30%, 2.7A, ROHS External Synchronization up to 8MHz U1 IC-2A/1.7A INTERSIL ISL8022IRZ Typical 6.5A Logic Controlled Shutdown Current BUCK 100% Maximum Duty Cycle for Lowest Dropout REGULATOR, 12P, DFN, 4X3, Internal Current Mode Compensation ROHS Peak Current Limiting, Hiccup Mode Short Circuit R1, R3, R6 RES, SMD, 0402, PANASONIC ERJ2RKF1003 Protection and Over-temperature Protection 100k, 1/16W, Negative Current Detection and Protection 1%, TF, ROHS R5 RES, SMD, 0402, ROHM MCR01MZPF2003 Recommended Equipment 200k, 1/16W, YAGEO RC0402FR-07200KL The following materials are recommended to perform 1%, TF, ROHS VISHAY/ CRCW0402200KFKED testing: DALE 0V to 10V Power Supply with at least 3A source VENKEL CR0402-16W-2003FT current capability or 5V battery R2 RES, SMD, 0402, PANASONIC ERJ-2RKF3163X Electronic Loads capable of sinking current up to 3A 316k, 1/16W, VENKEL CR0402-16W-3163FT 1%, TF, ROHS Digital Multimeters (DMMs) 100MHz quad-trace oscilloscope R9 RES, SMD, 0402, DNP, DNP, DNP, Signal generator TF, ROHS Quick Setup Guide 1. Ensure that the circuit is correctly connected to the supply and loads prior to applying any power. 2. Connect the bias supply to VIN, the plus terminal to VIN and the negative return to P1. 3. Turn on the power supply. 4. Verify the output voltage is 2.5V for V and 1.8V OUT1 for V OUT2. AN1587 Rev 1.00 Page 1 of 3 Aug 10, 2010Application Note 1587 ISL8022EVAL2Z AN1587 Rev 1.00 Page 2 of 3 Aug 10, 2010 VIN VIN C8 10UF U1 P1 FB2 FB1 1 12 FB1 FB2 2 11 A EN1 EN2 SYNC 3 10 PG SYNC 4 9 1.2UH VIN1 VIN2 L1 LX2 L2 1 2 LX1 5 8 1 2 LX1 LX2 6 7 VOUT1 1.2UH PGND1 PGND2 VIN VOUT1 VOUT2 13 VOUT1 EP VOUT2 PFM C1 10UF C6 C2 ISL8022IRZ C4 C7 OPEN 22UF 22UF OPEN R1 100K A PGND1 A SYNC A P2 C3 R2 R5 C5 10PF 316K R9 200K 10PF OPEN PWM A R3 R6 A 100K 100K A FIGURE 1. ISL8022EVAL2Z SCHEMATIC FIGURE 2. TOP COMPONENTS FIGURE 3. BOTTOM SILK SCREEN