Application Note 1929 ISL85413EVAL1Z, ISL85412EVAL1Z Evaluation Boards Description Key Features The ISL85413EVAL1Z, ISL85412EVAL1Z kits are intended for use in point-of-load applications sourcing from 3.5V to 40V. The kits are used to demonstrate the performance of the ISL85413, ISL85412 Wide VIN Low Quiescent Current High Efficiency Synchronous Buck Regulator with 300mA or 150mA output current. • Small, compact design The ISL85413, ISL85412 are offered in a 3mmx3mm 8 Ld DFN package with 1mm maximum height. Specifications The evaluation boards are designed to operate at the following operating conditions: • Switch selectable EN (enable/disabled) • Switch selectable MODE (auto PFM/forced PWM) • Connectors, test points and jumpers for easy probing References • Reference ISL85413 and ISL85412 datasheets for efficiency and typical performance curves Ordering Information PART NUMBER DESCRIPTION • Input voltage rating from 3.5V to 40V ISL85413EVAL1Z Evaluation Board (300mA Output Current) • Fixed 3.3V output voltage ISL85412EVAL1Z Evaluation Board (150mA Output Current) • Up to 300mA output current (ISL85413), up to 150mA output current (ISL85412) • 700kHz switching frequency • Operating junction temperature range: -40°C to +125°C FIGURE 1. FRONT OF EVALUATION BOARD ISL85413EVAL1Z March 13, 2015 AN1929.1 1 FIGURE 2. BACK OF EVALUATION BOARD ISL85413EVAL1Z 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 2014, 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 1929 Functional Description Quick Setup Guide The ISL85413EVAL1Z, ISL85412EVAL1Z provide simple platforms to demonstrate the features of the ISL85413, ISL85412 wide input synchronous buck regulator. The ISL85413EVAL1Z is for 300mA output current and ISL85412EVAL1Z is for 150mA output current. The evaluation boards have been functionally optimized for best performance of the ISL85413, ISL85412 ICs. The ISL85413EVAL1Z board is shown in Figures 1 and 2. The evaluation board contains an S1 switch that enables or disables the part, thus allowing low quiescent current state. The MODE function is controlled by a S2 switch that allows different mode operation. Default board configuration has R6 = 200k to VCC, which defaults to PWM operation mode. If this pin is tied to GND, the IC will operate in PFM mode. The schematic of the ISL85413EVAL1Z evaluation board is shown on page 3. The PCB layout images for top and bottom layers are shown in Figures 3 and 4. The Bill of Materials of the ISL85413EVAL1Z and ISL85412EVAL1Z is shown on page 3. 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 GND1. 3. Verify that the position is ON for S1. 4. Turn on the power supply. 5. Verify the output voltage is 3.3V for VOUT. Evaluating the Other Output Voltage The ISL85413VAL1Z and ISL85412VAL1Z kit outputs are preset to 3.3V; however, output voltages can be adjusted from 0.6V to 12V. The output voltage programming resistor, R2, will depend on the desired output voltage of the regulator. The value for the feedback resistor is typically between 0Ω and 50kΩ as shown in Equation 1. 0.6 R 2 = R 1 ------------------------------ V OUT – 0.6 (EQ. 1) If the output voltage desired is 0.6V, then R1 is shorted. Operating Range The VIN range of the boards is 3.5V to 40V. The VOUT range is 0.6V to 12V. The operating junction temperature range is -40°C to +125°C. Table 1 shows the component selection that should be used for the respective VOUT. Recommended Equipment The following materials are recommended to perform testing: • 0V to 50V power supply with at least 2A source current capability • Electronic loads capable of sinking current up to 1.5A • Digital Multimeters (DMMs) • 100MHz quad-trace oscilloscope • Signal generator TABLE 1. EXTERNAL COMPONENT SELECTION (REFER TO Figure 1) VOUT (V) C4 (pF) C8 (µF) L1 (µH) R1 (kΩ) R2 (kΩ) 1.0 100 2x22 10 90.9 137 1.2 100 2x22 10 90.9 90.9 1.5 100 2x22 16 90.9 60.4 1.8 100 2x22 16 90.9 45.3 2.5 100 22 22 90.9 28.7 3.3 100 22 33 90.9 20.0 5.0 100 22 47 90.9 12.4 12 100 22 100 90.9 4.75 Submit Document Feedback 2 AN1929.1 March 13, 2015 Application Note 1929 ISL85413EVAL1Z Schematic JVO 1 2 VO 1 C1 10UF C2 10UF L1 VO C8 C7 33UH 22UF 22UF GND2 JLX 4 A 1 FB 8 8 VCC 7 7 1MODE 2 2BOOT 3 3VIN PG 6 4 4PHASE EN 5 9 EP A 1 2 VCC VCC 6PG 5EN ISL85413FRZ C5 R3 C4 20 VO 100PF R2 1UF 90.9K 20K A A 3 C3 150UF C6 0.1UF VIN 2 GND1 MODE A VIN R1 U1 3 4 A A VCC VIN R5 200K EN 2 ON 3 S1 1 MODE S2 1 PFM R7 OFF R6 2 PWM 3 PG PG 1 D1 A Q1 1 DNP DNP 2.05K 2N7002 2 EN MODE R9 R8 200K 32 R4 200K A A ISL85413EVAL1Z, ISL85412EVAL1Z Bill of Materials MANUFACTURER PART REFERENCE DESIGNATOR QTY UNITS ISL85413EVAL1ZREVAPCB 1 ea SEE LABELRENAME BOARD C1608X7R1C105K 1 ea EEE-FK1H151P 1 06035C104KAT2A DESCRIPTION MANUFACTURER PWB-PCB, ISL85413EVAL1Z, REVA, ROHS TBD C5 CAP, SMD, 0603, 1.0µF, 16V, 10%, X7R, ROHS TDK ea C3 CAP, SMD, 10.3mm, 150µF, 50V, 20%, ROHS, ALUM.ELEC. PANASONIC 1 ea C6 CAP, SMD, 0603, 0.1µF, 50V, 10%, X7R, ROHS AVX ECJ-1VC1H331J 1 ea C4 CAP, SMD, 0603, 100pF, 50V, 5%, NP0, ROHS PANASONIC C3216X5R1H106K 2 ea C1, C2 CAP, SMD, 1206, 10µF, 50V, 10%, X5R, ROHS TDK GRM31CR60J226KE19L 1 ea C7 CAP, SMD, 1206, 22µF, 6.3V, 10%, X5R, ROHS MURATA 0 ea C8 CAP, SMD, 1206, DNP-PLACE HOLDER, ROHS DR73-330-R 1 ea L1 COIL-PWR INDUCTOR, SMD, 7.6mm, 33µH, 20%, 1.31A, ROHS 131-4353-00 2 ea JLX, JVO Submit Document Feedback 3 COOPER/ COILTRONICS CONN-SCOPE PROBE TEST PT, COMPACT, TEKTRONIX PCB MNT, ROHS AN1929.1 March 13, 2015 Application Note 1929 ISL85413EVAL1Z, ISL85412EVAL1Z Bill of Materials (Continued) QTY UNITS REFERENCE DESIGNATOR 1514-2 4 ea VO, VIN, GND1, GND2 CONN-TURRET, TERMINAL POST, TH, ROHS KEYSTONE 5000 4 ea EN, PG, VCC, SYNC CONN-MINI TEST PT, VERTICAL, RED, ROHS KEYSTONE LTST-C190KGKT 1 ea D1 LED, SMD, 0603, GREEN CLEAR, 2V, 20mA, 571nm, 35mcd, ROHS LITEON/VISHAY ISL85412FRZ for ISL85412EVAL1Z 1 ea U1 IC-150mA BUCK REGULATOR, 12P, DFN, INTERSIL 3X3, ROHS ISL85413FRZ for ISL85413EVAL1Z 1 ea U1 IC-300mA BUCK REGULATOR, 12P, DFN, INTERSIL 3X3, ROHS 2N7002-7-F 1 ea Q1 TRANSISTOR, N-CHANNEL, 3LD, SOT-23, DIODES, INC. 60V, 115mA, ROHS 0 ea R6, R7 RESISTOR, SMD, 0603, 0.1%, MF, DNPPLACE HOLDER ERJ-3EKF20R0V 1 ea R3 RES, SMD, 0603, 20Ω, 1/10W, 1%, TF, ROHS PANASONIC CR0603-10W-2002FT 1 ea R2 RES, SMD, 0603, 20k, 1/10W, 1%, TF, ROHS VENKEL CR0603-10W-2003FT 3 ea R4, R5, R8 RES, SMD, 0603, 200k, 1/10W, 1%, TF, ROHS VENKEL CR0603-10W-2051FT 1 ea R9 RES, SMD, 0603, 2.05k, 1/10W, 1%, TF, VENKEL ROHS ERJ-3EKF9102V 1 ea R1 RES, SMD, 0603, 91k, 1/10W, 1%, TF, ROHS PANASONIC GT11MSCBE 2 ea S1, S2 SWITCH-TOGGLE, SMD, 6PIN, SPDT, 2POS, ON-ON, ROHS ITT INDUSTRIES/ C&K DIVISION MANUFACTURER PART DESCRIPTION MANUFACTURER 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 4 AN1929.1 March 13, 2015 Application Note 1929 ISL85413EVAL1Z Board Layout FIGURE 3. SILK SCREEN TOP FIGURE 4. TOP LAYER COMPONENT SIDE Submit Document Feedback 5 AN1929.1 March 13, 2015 Application Note 1929 ISL85413EVAL1Z Board Layout (Continued) FIGURE 5. LAYER 2 FIGURE 6. LAYER 3 Submit Document Feedback 6 AN1929.1 March 13, 2015 Application Note 1929 ISL85413EVAL1Z Board Layout (Continued) FIGURE 7. LAYER 4 FIGURE 8. SILK SCREEN BOTTOM Submit Document Feedback 7 AN1929.1 March 13, 2015