Application Note 1817 ISL8002xDEMO1Z and ISL80019xDEMO1Z Demonstration Board User Guide Description Key Features The ISL8002, ISL80019, ISL8002A, ISL8002D and ISL80019A DEMO1Z kits are intended for use by individuals with requirements for Point-of-Load applications sourcing from 2.7V to 5.5V. The ISL8002DEMO1Z and ISL80019DEMO1Z boards are used to demonstrate the performance of the ISL8002 and ISL80019 low quiescent current mode converters. • High efficiency synchronous buck regulator with up to 95% efficiency The ISL8002 and ISL8019 are offered in a 8 pin 2mmx2mm TDFN package with 1mm maximum height. The complete converter occupies less than 64mm2 area. • Soft-stop output discharge during disable • 0.8% reference accuracy over temperature/load/line • Start-up with prebiased output • Internal soft-start - 1ms • 1MHz, 2MHz default frequency • Negative OC protection TABLE 1. KEY DIFFERENCES BETWEEN FAMILY OF PARTS IOUT (MAX) (A) FSW (MHz) ISL80019 1.5 1 ISL80019A 1.5 2 ISL8002 2 1 ISL8002A 2 2 ISL8002D 2 2 PART# TP1 VIN RANGE (V) VOUT RANGE (V) 2.7 to 5.5 0.6 to 5.5 Ordering Information PACKAGE SIZE PART NUMBER 8 pin 2mmx2mm TDFN ISL8002DEMO1Z Switching frequency 1MHZ; Output current: 2A; PG rising /falling delay time: 1ms/15µs ISL8002ADEMO1Z Switching frequency 2MHZ; Output current: 2A; PG rising /falling delay time: 1ms/15µs ISL80019DEMO1Z Switching frequency 1MHZ ; Output current: 1.5A; PG rising /falling delay time: 1ms/15µs ISL80019ADEMO1Z Switching frequency 2MHZ; Output current: 1.5A; PG rising /falling delay time: 1ms/15µs ISL8002DDEMO1Z Switching frequency 2MHZ; Output current: 2A; PG rising /falling delay time: 390µs/330µs U1 VIN VIN EN MODE C2 C1 22UF 22µF 22UF 22µF 1 2 3 4 9 A TP2 VIN EN MODE PG EP PHASE PGND FB COMP L1 2 1.2UH 1.2µH A VO VO R1 C5 22PF 22pF 200kΩ ISL8002 C6 220PF 220pF R14 100kΩ A 1 8 7 6 5 DESCRIPTION C7 OPEN R12 DNP C3 22µF TP3 C4 22UF 22µF R2 100kΩ TP4 A A VIN VIN A VIN VIN VIN VIN R7 100kΩ ON R6 100kΩ PWM R9 OPEN PFM MODE EN EN R8 OPEN OFF A A FIGURE 1. ISL8002DEMO1Z SCHEMATIC March 10, 2015 AN1817.1 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 2013, 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. Application Note 1817 ISL8002EVAL2Z Evaluation Board FIGURE 2. TOP SIDE FIGURE 3. BOTTOM SIDE Submit Document Feedback 2 AN1817.1 March 10, 2015 Application Note 1817 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. 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. Recommended Equipment The following materials are recommended to perform testing: • 0V to 10V power supply with at least 5A source current capability or 5V battery • Electronic loads capable of sinking current up to 7A PCB Layout Guidelines 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 pin 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 closely 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 best thermal relief. • Digital Multimeters (DMMs) • 100MHz quad-trace oscilloscope Signal generator FIGURE 4. SILKSCREEN TOP Submit Document Feedback 3 FIGURE 5. SILKSCREEN BOTTOM AN1817.1 March 10, 2015 Application Note 1817 TABLE 2. BILL OF MATERIALS PART NUMBER QTY UNITS REFERENCE DESIGNATOR COMMENT DESCRIPTION MANUFACTURER H1044-00220-50V5-T 1 ea. C5 CAP, SMD, 0402, 22pF, 50V, 5%, NP0 H1044-00221-50V5-T 1 ea. C6 CAP, SMD, 0402, PANASONIC, TDK 220pF, 50V, 5%, C0G H1044-DNP 0 ea. C7 CAP, SMD, 0402, DNP-PLACE HOLDER H1046-00226-6R3V10-T 4 ea. C1, C2, C3, C4 CAP, SMD, 0805, 22µF, JOHANSON DIELECTRICS 6R3R15X226KV4E 6.3V, 10%, X5R, ROHS INC JMK212BJ226KG-T VLCF-4028T-1R2N2R7-2 1 ea. TDK L1 for ISL8002A, COIL-PWR INDUCTOR, WW, ISL80019A, SMD, 4mm, 1.2µH, 2MHz 30%, 2.7A, ROHS VLCF4028T-1R2N2R7-2 74437324022 1 ea. Wurth Electronics L1 for ISL8002, COIL-PWR ISL80019, 1MHz INDUCTOR, SMD, 4.45x4.6, 2.2µH, 20%, 3.25A, ROHS 74437324022 ISL8002IRZ 1 ea. U1 IC-2A BUCK REGULATOR, 8P, µTDFN, 2X2, ROHS INTERSIL ISL8002IRZ H2510-01003-1/16W1-T 2 ea. R2, R14 RES, SMD, 0402, 100kΩ, 1/16W, 1% PANASONIC ERJ2RKF1003 H2510-02003-1/16W1-T 1 ea. R1 RES,SMD, 0402, 200kΩ, 1/16W, 1% VISHAY/DALE, VENKEL CRCW0402200KFKED CR0402-16W-2003FT PANASONIC ROHM ERJ-3EKF1003V MCR03EZPFX1003 H2510-DNP 0 ea. R12 RES, SMD, 0402, DNP H2511-01003-1/10W1-T 2 ea. R6, R7 RES, SMD, 0603, 100kΩ, 1/10W, 1% H2511-DNP 0 ea. R8, R9 RES, SMD, 060 3, DNP-PLACE HOLDER MURATA PANASONIC MANUFACTURER PART GRM36COG220J050AQ ECU-E1H220JCQ ECU-E1H221JCQ C1005C0G1H221J VLCF4028T-1R2N2R7-2 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 Application Note or Technical Brief is current before proceeding. For information regarding Intersil Corporation and its products, see www.intersil.com Submit Document Feedback 4 AN1817.1 March 10, 2015 Application Note 1817 Typical Performance Curves LX 5V/DIV VIN 5V/DIV VOUT 1V/DIV VOUT 2V/DIV VEN 2V/DIV IL 1A/DIV PG 5V/DIV PG 5V/DIV 500µs/DIV 1ms/DIV FIGURE 6. ISL8002A START-UP AT 2A LOAD fSW = 2MHz, VIN = 5V, MODE = PWM, TA = +25°C FIGURE 7. ISL8002D START-UP VIN AT 2A LOAD fSW = 2MHz, VIN = 5V, MODE = PWM, TA = +25°C LX 5V/DIV VOUT 0.5V/DIV IL 1A/DIV IL 2A/DIV VOUT 1V/DIV PG 5V/DIV PG 5V/DIV 5µs/DIV 500µs/DIV FIGURE 8. ISL8002A OUTPUT SHORT-CIRCUIT fSW = 2MHz, VIN = 5V, MODE = PFM, TA = +25°C FIGURE 9. ISL8002A OVERCURRENT PROTECTION fSW = 2MHz, VIN = 5V, MODE = PWM, TA = +25°C PHASE 5V/DIV PHASE 5V/DIV VOUT 0.5V/DIV VOUT 2V/DIV IL 2A/DIV IL 2A/DIV PG 5V/DIV PG 5V/DIV 200µs/DIV FIGURE 10. ISL8002D OUTPUT SHORT-CIRCUIT fSW = 2MHz, VIN = 5V, MODE = PFM, TA = +25°C Submit Document Feedback 5 500µs/DIV FIGURE 11. ISL8002D OVERCURRENT PROTECTION fSW = 2MHz, VIN = 5V, MODE = PWM, TA = +25°C AN1817.1 March 10, 2015