User Guide 047 ISL8003xDEMO1Z Demonstration Boards User Guide Description Key Features The ISL8003xDEMO1Z boards are intended for use by individuals with requirements for point-of-load applications sourcing from 2.7V to 5.5V. The ISL8003xDEMO1Z boards are used to demonstrate the performance of the ISL80030, ISL80031 low quiescent current mode converter. • Small, compact design • VIN range of 2.7V to 5.5V • IOUT maximum is 3A • Switching frequency is 1MHz These devices are offered in an 8 Ld 2mmx2mm DFN package with 1mm maximum height. The complete converter occupies less than 64mm2 area. • Negative current protection Specifications • Over-temperature/thermal protection These boards have been configured and optimized for the following operating conditions: References • Internal soft-start and soft-stop • Overcurrent and short-circuit protection ISL80030, ISL80030A, ISL80031, ISL80031A Datasheet • VIN = 2.7V to 5.5V Ordering Information • VOUT = 1.8V • IOUT = 3A (maximum) PART NUMBER • Switching frequency is 1MHz • Up to 95% peak efficiency DESCRIPTION ISL80030DEMO1Z 3A, PWM, 1MHz demonstration board ISL80031DEMO1Z 3A, PFM, 1MHz demonstration board ISL80030/ISL80031 VIN 1 C1 GND 2 3 EN 4 PG L VIN PHASE VIN PGND EN PGND PG EPAD FB 9 8 VOUT C3 GND 7 C5 6 R1 5 R2 FIGURE 1. BLOCK DIAGRAM September 25, 2015 UG047.0 1 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 047 Test Steps PCB Layout Guidelines 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 (TP1) and negative return to PGND (TP2). 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 ISL8003xDEMO1Z boards provide a simple platform to evaluate performance of the ISL80030, ISL80031. These devices are highly efficient, monolithic, synchronous step-down DC/DC converters that can deliver up to 3A 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 switching frequency, thereby providing superior transient response and allowing for the use of a small inductor. FIGURE 2. ISL80030DEMO1Z TOP SIDE Submit Document Feedback 2 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 PHASEs 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 close 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. FIGURE 3. ISL80030DEMO1Z BOTTOM SIDE UG047.0 September 25, 2015 User Guide 047 ISL80030DEMO1Z 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 . For ISL80020, PIN 2 is EN and always tied to VIN. PIN 3 is SGND populate R8 = 0Ω to tie PIN 3 to ground. 21 (1 5 23(1 2)) For ISL80030, PIN 2 is VIN. PIN 3 is EN: Connect R7 = 100kΩ; R8 is open. $ FIGURE 4. ISL80030DEMO1Z SCHEMATIC Bill of Materials MANUFACTURER PART REFERENCE QTY UNITS DESIGNATOR C2012X5R0J226M 4 ea. C1-C4 GRM36COG220J050AQ 1 ea. 744-383560 10 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, SMD, 4.1mm2, 1.0µH, 20%, 7.2A, ROHS WE 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 ISL80030FRZ (ISL80030DEMO1Z) ISL80031FRZ (ISL80031DEMO1Z 1 ea. U1 IC-3A, PWM, 1MHz BUCK REGULATOR, 8P, DFN, 2x2, ROHS IC-3A, PFM, 1MHz BUCK REGULATOR, 8P, DFN, 2x2, ROHS INTERSIL ERJ2RKF1003 2 ea. R2, R7 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. R8 RES, SMD, 0402, DNP, DNP, DNP, TF, ROHS Submit Document Feedback 3 UG047.0 September 25, 2015 User Guide 047 Board Layout FIGURE 5. SILKSCREEN TOP FIGURE 6. LAYER 1 FIGURE 7. LAYER 2 FIGURE 8. LAYER 3 FIGURE 9. LAYER 4 FIGURE 10. SILKSCREEN BOTTOM Submit Document Feedback 4 UG047.0 September 25, 2015 User Guide 047 Typical Performance Curves 100 VOUT = 3.3V 93 EFFICIENCY (%) VEN 5V/DIV 87 VOUT 1V/DIV 80 VOUT = 1.2V 73 VOUT = 1.5V VOUT = 1.8V VOUT = 2.5V 67 60 0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0 IL 2A/DIV PG 5V/DIV LOAD (A) FIGURE 11. EFFICIENCY vs LOAD fSW = 1MHz, VIN = 5V, PFM, TA = +25°C 500µs/DIV FIGURE 12. START-UP AT 3A LOAD VIN = 5V, PWM, TA = +25°C VOUT 1V/DIV VEN 5V/DIV VOUT 1V/DIV IL 2A/DIV IL 2A/DIV PG 5V/DIV PG 5V/DIV 500µs/DIV FIGURE 13. SHUTDOWN AT 3A LOAD VIN = 5V, PWM, TA = +25°C 500µs/DIV FIGURE 14. OVERCURRENT PROTECTION VIN = 5V, PWM, 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 UG047.0 September 25, 2015