ISL85014EVAL1Z

User Guide 113 ISL85014EVAL1Z Evaluation Board User Guide Description Key Features The ISL85014 is a 3.8V to 18V input, 14A synchronous buck regulator for applications with input voltage from multi-cell batteries or regulated 5V and 12V power rails. The device also provides an integrated bootstrap diode for the high-side gate driver to reduce the external parts count. The ISL85014EVAL1Z platform allows quick evaluation of the high-performance features of the ISL85014 buck regulator. • Switch selectable EN (enabled/disabled) • Frequency synchronization option • Jumper selectable mode (DEM/Forced CCM) • Jumper selectable OCP mode (Hiccup/Latch-off) • Jumper selectable frequency (600kHz/300kHz) • Connectors and test points for easy probing Specifications • Compact design Related Literature This board has been configured and optimized for the following operating conditions: • For a full list of related documents, visit our website - ISL85014 product pages • Input voltage ranges from 4.5V to 18V • 1.8V nominal output voltage Ordering Information • Up to 14A output current capability • Default internally set to 600kHz switching frequency PART NUMBER • Default internally set to 3ms soft-start DESCRIPTION ISL85014EVAL1Z Evaluation board for ISL85014FRZ • Operating temperature range: -40°C to +85°C DISABLE ENABLE R1 R2 R3 C1 15 14 13 12 11 10 VIN EN DNC DNC COMP FB PVIN PVIN 9 PHASE 8 L1 4.5V TO 18V CIN VOUT 1.8V/14A COUT GND GND C4 7 GND SYNC 1 MODE 2 FREQ PG VDD BOOT 3 4 5 6 600kHz 300kHz HICCUP FCCM DEM LATCH-OFF C3 FIGURE 1. BLOCK DIAGRAM February 15, 2017 UG113.0 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 2017. 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 113 Connector and Test Point Descriptions The ISL85014EVAL1Z evaluation board includes I/O connectors and test points as shown in Table 1. TABLE 1. CONNECTORS AND TEST POINTS REFERENCE DESIGNATOR DESCRIPTION Quick Setup Guide Refer to the following instructions to configure and power-up the board for proper operation. 1. Set the power supply voltage to 12V and turn off the power supply. Connect the positive output of the power supply to J1 (PVIN) and the negative output to J3 (GND). 2. Connect an electronic load to J2 (VOUT) for the positive connection and J4 (GND) for the negative connection. J1 Input voltage positive connection J2 Output voltage positive connection J3 Input voltage return connection 4. Place scope probes on VOUT test point (J7) and other test points of interest. J4 Output voltage return connection 5. Toggle selection switch SW5 to ON position. J6 Two-position socket connector for PHASE to GND test J7 Two-position socket connector for VOUT to GND test 6. Set the load current to 0.1A and turn on the power supply. The output voltage should be in regulation with a nominal 1.8V output. PVIN PVIN positive test point GND GND test point VIN VIN positive test point 3. Measure the output voltage (test points VOUT and GND) with the voltmeter. 7. Slowly increase the load up to 14A while monitoring the output voltage, which should remain in regulation with a nominal 1.8V output. VOUT Output voltage positive test point 8. Slowly sweep VIN from 4.5V to 18V. The output voltage should remain in regulation with a nominal 1.8V output. SYNC External synchronization clock connection 9. Decrease the input voltage to 0V to shut down the regulator. EN VDD PG Enable test point Internal LDO output test point Power-good output Selection Switch and Jumper Descriptions • Switch SW5 (Enable) The switch enables and disables the ISL85014: - When the switch is in the ON position, the ISL85014 is enabled. - When the switch is in the OFF position, the ISL85014 is disabled. • Jumper J9 The jumper provides the selection of different operating modes, detailed as follows: - When the jumper is in the FCCM position, the ISL85014 operates in Forced CCM. - When the jumper is in the DEM position, the ISL85014 operates in Diode Emulation mode and enables automatic transition from CCM to DCM at light-load conditions. • Jumper J10 sets the switching frequency at either 600kHz or 300kHz. • Jumper J11 sets the OCP scheme in either Hiccup mode or Latch-Off mode. Submit Document Feedback 2 Frequency Synchronization The ISL85014 can be synchronized to an external clock with frequency ranges from 100kHz to 1MHz by applying the external clock to test point SYNC on the ISL85014EVAL1Z evaluation board. The external clock should meet the specifications of pulse width and voltage level described in the ISL85014 datasheet. Evaluating Other Output Voltages The ISL85014EVAL1Z has a nominal 1.8V output voltage. The output voltage is programmable by an external resistor divider formed by R1 and R2 as shown in Figure 1 on page 1. R1 is usually chosen first, then the value for R2 can be calculated based on R1 and the desired output voltage using Equation 1: R 1  0.6V R 2 = ---------------------------------V OUT – 0.6V (EQ. 1) UG113.0 February 15, 2017 User Guide 113 PCB Layout Considerations 3. Place the VDD decoupling capacitor close to the IC between VDD and GND. A 1µF ceramic capacitor is typically used. The PCB layout is critical for proper operation of the ISL85014. The following guidelines should be followed to achieve good performance. 4. Place a bootstrap capacitor close to the IC between the BOOT and PHASE pins. A 0.1µF ceramic capacitor is typically used. 1. Use a multilayer PCB structure to achieve optimized performance. A four-layer PCB is recommended for this design. 2. Use a combination of bulk capacitors and smaller ceramic capacitors with lower ESL for the input capacitors, and place them as close to the IC as possible. 5. Connect the feedback resistor divider between the output capacitor positive terminal and AGND pin of the IC, and place the resistors close to the FB pin of the IC. 6. Connect the GND of the IC to the ground planes underneath using multiple thermal vias to improve thermal performance. ISL85014EVAL1Z Evaluation Board FIGURE 2. TOP VIEW Submit Document Feedback 3 UG113.0 February 15, 2017 User Guide 113 ISL85014EVAL1Z Schematic EN Disable SW5 C3 DNP DNP R3 C1 DNP DNP R1 200k R7 20 R2 100k 10 12 COMP 14 VIN R9 0 DNP EN U1 15 GND R5 NC C7 1nF 13 VIN C2 FB R10 200 11 R4 100k C5 1u Internal Compensation SW SPDT NC1 Enable PVIN J1 1 9 PVIN ISL85014 VOUT J2 L1 330uF/25V C14 C13 22uF 22uF 8 PHASE C9 1 0.68uH 22uF 1 7 C4 100n J6 SYNC BOOT J7 C10 C11 C12 C16 100uF 100uF 100uF DNP J4 1 6 VDD 5 4 PG FREQ 3 1 2 MODE SYNC 2 GND 1 1 J3 2 C6 VDD PG C8 2.2uF 300kHz 3 600kHz Latch off DEM Hiccup FCCM 1 J10 3 J11 1 3 1 2 2 2 R6 100k J9 FIGURE 3. ISL85014EVAL1Z SCHEMATIC Submit Document Feedback 4 UG113.0 February 15, 2017 User Guide 113 Bill of Materials REFERENCE DESIGNATOR QTY U1 1 IC-14A BUCK REGULATOR, 15P, TDFN, 3.5x3.5, ROHS ISL85014FRZ INTERSIL C6 1 CAP-OSCON, SMD, 10.3x10.3mm, 330µF, 25V, 20%, 14mΩ, ROHS 25SVPF330M SANYO C4 1 CAP, SMD, 0402, 0.1µF, 50V, 10%, X7R, ROHS C1005X7R1H104K TDK C5 1 CAP, SMD, 0603, 1.0µF, 25V, 10%, X5R, ROHS GRM188R61E105KA12D MURATA C8 1 CAP, SMD, 0603, 2.2µF, 10V, 10%, X7R, ROHS GRM188R71A225KE15D MURATA C10, C11, C12, C18 4 CAP, SMD, 1206, 100µF, 6.3V, 20%, X5R, ROHS GRM31CR60J107ME39L MURATA C9, C13, C14, C17 4 CAP, SMD, 1210, 22µF, 25V, 10%, X7R, ROHS GRM32ER71E226KE15L MURATA J6, J7 2 CONN-SOCKET STRIP, TH, 2P, 2.54mmPITCH, ROHS 310-87-102-41-001101 PRECI-DIP VDD, SYNC, PG, EN, GND, VIN, PVIN, VOUT 8 CONN-MINI TEST POINT, VERTICAL, WHITE, ROHS 5002 KEYSTONE J9, J10, J11 3 CONN-HEADER, 1x3, BREAKAWY 1x36, 2.54mm, ROHS 68001-203HLF BERG/FCI L1 1 COIL-PWR CHOKE, SMD, 10x10x9.0mm, 0.68µH, 20%, ROHS 7443330068 WURTH ELEKTRONIK R7 1 RES, SMD, 0402, 20Ω, 1/16W, 1%, TF, ROHS ERJ2RKF20R0 PANASONIC R9 1 RES, SMD, 0402, 0Ω, 1/16W, 5%, TF, ROHS CR0402-16W-00T VENKEL R2, R4, R6 3 RES, SMD, 0402, 100k, 1/16W, 1%, TF, ROHS ERJ2RKF1003 PANASONIC R10 1 RES, SMD, 0402, 200Ω, 1/16W, 1%, TF, ROHS ERJ-2RKF2000X PANASONIC R1 1 RES, SMD, 0402, 200k, 1/16W, 1%, TF, ROHS MCR01MZPF2003 ROHM C7 1 CAP, SMD, 0402, 1nF, 50V, 10%, X7R, ROHS SW5 1 SWITCH-TOGGLE, SMD, 6PIN, SPDT, 2POS, ON-NONE-ON, ROHS GT11MSCBE-T ITT INDUSTRIES/C&K DIVISION J1, J2 2 CONN-GEN, BIND. POST, INSUL-RED, THMBNUT-GND 111-0702-001 JOHNSONS J3, J4 2 CONN-GEN, BIND. POST, INSUL-BLK, THMBNUT-GND 111-0703-001 JOHNSONS Jumper 1 CONN-JUMPER, SHORTING, 2PIN, BLK, OPEN TOP, 2.54mmPITCH, ROHS 929950-00 3M R3, R5 0 RES, SMD, 0402, DNP, TF, ROHS C1, C2, C3, C16 0 CAP, SMD DNP-PLACE HOLDER, ROHS PCB 1 PWB-PCB, ISL85014EVAL1Z, REVA, ROHS ISL85014EVAL1Z Any DESCRIPTION Submit Document Feedback 5 PART NUMBER MANUFACTURER MURATA UG113.0 February 15, 2017 User Guide 113 ISL85014EVAL1Z PCB Layout FIGURE 4. TOP LAYER FIGURE 5. LAYER 2 FIGURE 6. LAYER 3 FIGURE 7. BOTTOM LAYER Submit Document Feedback 6 UG113.0 February 15, 2017 User Guide 113 Typical Performance Curves VIN = 12V, VOUT = 1.8V, L = 0.68µH, fSW = 600kHz, TA = +25°C, unless otherwise noted. 100 VOUT (1V/DIV) EFFICIENCY (%) 90 80 70 IL (10A/DIV) 60 50 VIN = 12V, fsw = 600kHz, DEM 40 VIN = 5V, fsw = 600kHz, DEM EN (10V/DIV) 30 0 2 4 6 8 10 12 14 OUTPUT CURRENT (A) FIGURE 8. EFFICIENCY vs LOAD 1ms/DIV FIGURE 9. START-UP WITH EN, IOUT = 14A VOUT (10mV/DIV), AC COUPLING VOUT (50mV/DIV), AC COUPLING IOUT (5A/DIV) PHASE (5V/DIV) 50µs/DIV 1µs/DIV FIGURE 10. LOAD TRANSIENT, 0A → 14A → 0A, 2.5A/µs FIGURE 11. OUTPUT VOLTAGE RIPPLE, IOUT = 14A 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 7 UG113.0 February 15, 2017