User Guide 026 ISL800xxxDEMO1Z Demonstration Boards User Guide Description Key Features The ISL800xxxDEMO1Z boards are intended for use by individuals with requirements for point-of-load applications sourcing from 2.7V to 5.5V. The ISL800xxxDEMO1Z boards are used to demonstrate the performance of the ISL80020, ISL80020A, ISL80015, ISL80015A low quiescent current mode converter. • Small, compact design These devices are offered in an 8 Ld 2mmx2mm TDFN package with 1mm maximum height. The complete converter occupies less than 64mm2 area. • VIN range of 2.7V to 5.5V • IOUT maximum is 2A or 1.5A • Switching frequency is 1MHz or 2MHz • Negative current protection • Internal soft-start and soft stop • Overcurrent and short-circuit protection • Over-temperature/thermal protection Specifications These boards have been configured and optimized for the following operating conditions: • VIN = 2.7V to 5.5V References ISL80020, ISL80020A, ISL80015, ISL80015A Datasheet Ordering Information • VOUT = 1.8V • IOUT maximum - 2A for ISL80020, ISL80020A - 1.5A for ISL80015, ISL80015A • Switching frequency - 2MHz for ISL80020A, ISL80015A - 1MHZ for ISL80020, ISL80015 PART NUMBER DESCRIPTION ISL80020DEMO1Z 2A, 1MHz Demonstration Board ISL80020ADEMO1Z 2A, 2MHz Demonstration Board ISL80015DEMO1Z 1.5A, 1MHz Demonstration Board ISL80015ADEMO1Z 1.5A, 2MHz Demonstration Board • Up to 95% peak efficiency FIGURE 1. ISL80020DEMO1Z TOP SIDE June 1, 2015 UG026.0 1 FIGURE 2. ISL80020DEMO1Z BOTTOM SIDE CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2015. All Rights Reserved Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries. All other trademarks mentioned are the property of their respective owners. User Guide 026 Test Steps These devices are configured in PWM (Pulse Width Modulation) for fast transient response, which helps reduce the output noise and RF interference. 1. Ensure that the circuit is correctly connected to the supply and loads prior to applying any power. PCB Layout Guidelines 2. Connect the bias supply to VIN. Plus terminal to VIN (TP1) and negative return to PGND (TP2). The PCB layout is a very important converter design step to make sure the designed converter works well. The power loop is composed of the output inductor L’s, the output capacitor COUT, the PHASE’s pins and the PGND pin. It is necessary to make the power loop as small as possible and the connecting traces among them should be direct, short and wide. The switching node of the converter, the PHASE pins and the traces connected to the node are very noisy, so keep the voltage feedback trace away from these noisy traces. The input capacitor should be placed as close as possible to the VIN pin and the ground of the input and output capacitors should be connected as closely as possible. The heat of the IC is mainly dissipated through the thermal pad. Maximizing the copper area connected to the thermal pad is preferable. In addition, a solid ground plane is helpful for better EMI performance. It is recommended to add at least 4 vias ground connection within the pad for the best thermal relief. 3. Connect the output load to VO (TP3), and the negative return to PGND (TP4). 4. Turn on the power supply. 5. Verify the output voltage is 1.8V for VOUT. Functional Description The ISL800xxxDEMO1Z boards provide a simple platform to evaluate performance of the ISL80020, ISL80020A, ISL80015, ISL80015A. These devices are highly efficient, monolithic, synchronous step-down DC/DC converters that can deliver up to 1.5A or 2A of continuous output current from a 2.7V to 5.5V input supply. They use peak current mode control architecture to allow very low duty cycle operation. The devices operate at 1MHz or 2MHz switching frequency, thereby providing superior transient response and allowing for the use of small inductor. ISL80020DEMO1Z Schematic 8 / 9,1 73 9,1 (1 (1 & 8) & 8) $ 3+$6( 3*1' 6*1' 1& 3* )% 92 73 )% $ & 3) 9 5 . & 8) & 8) (3 ,6/ 5 . 73 73 $ $ $ )25,6/3,1,6(1$1'$/:$<67,(729,13,1,66*1'3238/$7(5 2+0727,(3,172*5281' )25,6/3,1,69,13,1,6(1:,//&211(&75 .2+065,623(1 9,1 5 23(1 21 (1 5 2)) $ FIGURE 3. ISL80020DEMO1Z SCHEMATIC Submit Document Feedback 2 UG026.0 June 1, 2015 User Guide 026 Bill of Materials MANUFACTURER PART REFERENCE QTY UNITS DESIGNATOR C2012X5R0J226M 4 ea C1-C4 GRM36COG220J050AQ 1 ea VLCF4028T-1R2N2R7-2 1 5000 DESCRIPTION MANUFACTURER CAP, SMD, 0805, 22µF, 6.3V, 20%, X5R, ROHS TDK C5 CAP, SMD, 0402, 22pF, 50V, 5%, NP0, ROHS MURATA ea L1 COIL-PWR INDUCTOR, WW, SMD, 4mm, 1.2µH, 30%, 2.7A, ROHS TDK 2 ea TP1, TP3 CONN-MINI TEST PT, VERTICAL, RED, ROHS KEYSTONE 5001 2 ea TP2, TP4 CONN-MINI TEST PT, VERTICAL, BLK, ROHS KEYSTONE ISL80020AIRZ (ISL80020ADEMO1Z) ISL80020IRZ (ISL80020DEMO1Z) ISL80015IRZ (ISL80015DEMO1Z) ISL80015AIRZ (ISL80015ADEMO1Z) 1 ea U1 IC-2A, 2MHz BUCK REGULATOR, 8P, TDFN, 2X2, ROHS IC-2A, 1MHz BUCK REGULATOR, 8P, TDFN, 2X2, ROHS IC-1.5A, 1MHz BUCK REGULATOR, 8P, TDFN, 2X2, ROHS IC-1.5A, 2MHz BUCK REGULATOR, 8P, TDFN, 2X2, ROHS INTERSIL ERJ2RKF1003 1 ea R2 RES, SMD, 0402, 100k, 1/16W, 1%, TF, ROHS PANASONIC MCR01MZPF2003 1 ea R1 RES, SMD, 0402, 200k, 1/16W, 1%, TF, ROHS ROHM 0 ea R7 RES, SMD, 0402, DNP, DNP, DNP, TF, ROHS 1 ea R8 RES, SMD, 0603, 0Ω, 1/16W, TF, ROHS ERJ-3GEY0R00V Submit Document Feedback 3 PANASONIC UG026.0 June 1, 2015 User Guide 026 Board Layout FIGURE 4. SILKSCREEN TOP FIGURE 5. LAYER 1 FIGURE 6. LAYER 2 FIGURE 7. LAYER 3 FIGURE 8. LAYER 4 FIGURE 9. SILKSCREEN BOTTOM Submit Document Feedback 4 UG026.0 June 1, 2015 User Guide 026 Typical Performance Curves 100 VIN 5V/DIV EFFICIENCY (%) 90 VOUT 1V/DIV 80 2.5VOUT 70 1.5VOUT 1.8VOUT 3.3VOUT IL 1A/DIV 60 50 PG 5V/DIV 40 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 OUTPUT LOAD (A) 500µs/DIV FIGURE 10. EFFICIENCY vs LOAD, fSW = 2MHz, VIN = 5V, TA = +25°C FIGURE 11. START-UP VIN AT 2A LOAD, fSW = 2MHz, VIN = 5V, TA = +25°C VIN 5V/DIV VOUT 0.5V/DIV IL 1A/DIV IL 1A/DIV VOUT 1V/DIV PG 5V/DIV PG 5V/DIV 1ms/DIV FIGURE 12. SHUTDOWN VIN AT 2A LOAD, fSW = 2MHz, VIN = 5V, TA = +25°C 500µs/DIV FIGURE 13. OVERCURRENT PROTECTION, fSW = 2MHz, VIN = 5V, TA = +25°C Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that the document is current before proceeding. For information regarding Intersil Corporation and its products, see www.intersil.com Submit Document Feedback 5 UG026.0 June 1, 2015