Application Note 1743 Author: Jun Xiao Wide VIN Dual Integrated Buck Regulator With 6A/6A Continuous Output Current and LDOs Specifications FSW POSITION SWITCHING FREQUENCY (kHz) FSW = GND 300 FSW = OPEN 500 FSW = VCC 1000 Quick Setup Guide VIN RANGE (V) VOUT RANGE (V) 4.5V to 16V 0.6V to 5V PART SIZE (2mm) 5X6 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 VIN1, P1 and the negative return to PGND, P2. 3. Connect the output load to VOUT1 and VOUT2, the plus terminal to VOUT1, P6 and VOUT2, P8. The negative return to PGND, P7and P9. 4. Verify that the position is ON for SW1 and SW4. NOTES: 1. The Evaluation Kit default configuration is VOUT1 = 3.3V, VOUT2 = 5V, FSW = 1MHz. 2. VREF is 0.8. 5. Turn on the power supply. 6. Verify the output voltage is 3.3V for VOUT1 and 5V for VOUT2. Evaluating the Other Output Voltage Description The ISL95901EVAL1Z kit is intended for use by customers with requirements for Point-of-Load applications sourcing from 4.5V to 16V. The ISL95901EVAL1Z evaluation board is used to demonstrate the performance of the ISL95901 dual high-efficient buck regulator and LDOs. The ISL95901 is offered in a 5mmx6mm 46 Ld QFN package. Key Features • Wide input voltage range from 4.5V to 16V • Adjustable output voltages with continuous output current up to 6A The ISL95901 kit output is preset to 3.3V (VOUT1) and 5V (VOUT2), however, output voltages can be adjusted from 0.8V to 5V. The output voltage programming resistor, R3, R4 will depend on the desired output voltage of the regulator. The value for the feedback resistor is typically between 10Ω and 200kΩ, as shown in Equation 1. VO – VFB R 3, 4 = R 1, 2 ⎛ ------------------------⎞ ⎝ VFB ⎠ (EQ. 1) If the output voltage desired is 0.8V, then R3,4 is left unpopulated and R1,2 is shorted. For faster response performance, add 100pF in parallel to R3,4. Check bode plot to insure optimum performance. • 1% Accuracy over-temperature and VCC range Switches Control • Built-in low-power LDO for external µC The ISL95901 evaluation board contains switches SW1, SW3 and SW4 for various controls of the ISL95901 circuitries. Table 1 details this function. • Built-in compensation • Internally Set SS and OCP TABLE 1. SWITCH SETTINGS • Independent enable, power-good, and standby control inputs for each output SW1 ENABLE • Innovative R4(™) modulator 1 OFF DISABLE VOUT1 • Boot undervoltage detection 3 ON ENABLE VOUT1 SW3 MODE 1 PWM Fixed PWM frequency at light load 3 DCM Force continuous mode SW4 ENABLE 1 OFF DISABLE VOUT2 3 ON ENABLE VOUT2 Recommended Equipment The following materials are recommended to perform testing: • 0V to 20V power supply with at least 10A source current capability or 5V battery • Electronic loads capable of sinking current up to 7A FUNCTION FUNCTION • Digital Multimeters (DMMs) • 100MHz quad-trace oscilloscope • Signal generator July 29, 2013 AN1743.0 1 FUNCTION 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. 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. ISL95901EVAL1Z Schematic R26 VIN LDO3P3 MODE PG2 37 38 39 BYP5 C14 4.7UF -VINS 1UF R29 PGND2 PGND1 PGND2 PGND1 PGND2 PGND1 PGND2 0 0 VCC PG2 +VOS VO VO A VO VO VO REMOVABE VO TRACE VIN1 BYP5 MODE EN1 CH1 CH2 CH3 PG1 CH4 CH5 VOUT1 L2 VOUT2 2 1.5UH C7 25 C8 C23 C24 22UF 24 P8 22UF 22UF 22UF C27 C28 C29 C30 22UF 22UF 22UF 22UF A PHASE2 C31 C32 C33 C34 22UF 22UF 22UF 22UF VCC VOUT2 P9 R23 R21 A 1 P4 P15 C4 10UF 10UF A STB2 2 P19 C17 P5 FS P16 SW51 ON OFF GT11MSCBETR LDO3P3 LDO5 P23 1 3 100K J2 2 3 4 0 C3 C2 R25 10UF C1 10UF R28 20 1 26 PHASE2 VIN2 VIN1 1 P2 3 27 R27 DNP EN2 CH6 CH7 CH9 CH10 KEY2 100K A P1 R6 0.1UF R8 A VO A VIN1 VIN1 VIN1 VIN1 VIN1 A C12 28 100PF A 23 VIN2 VIN2 VIN2 22 14 A 20 GND 21 47 43 2 PHASE2 PHASE1 PHASE1 19 1 J1 30 29 C10 10K R4 52.3K EN2 31 BOOT2 32 A PHASE2 48 A R2 33 EPADS PHASE2 49 VOUT1 J4 B1 B2 B3 B4 B5 B6 B7 B8 B9 B10 B11 B12 B13 B14 B15 B16 B17 B18 B19 B20 B21 B22 B23 B24 B25 B26 B27 B28 B29 B30 VCC 13 A PGND1 4 P3 P3 P3 P3 P3 P3 P3 P3 P3 P3 P3 P3 P3 P3 P3 P3 P3 P3 P3 P3 P3 P3 P3 P3 P3 P3 P3 P3 P3 P3 68UF 12 1 2 34 P3 P3 P3 P3 P3 P3 P3 P3 P3 P3 P3 P3 P3 P3 P3 P3 P3 P3 P3 P3 P3 P3 P3 P3 P3 P3 P3 P3 P3 P3 2 11 PHASE1 C6 2 1.0UH PGND2 VIN1 C5 22UF C22 22UF 1 22UF 22UF 1 C21 VOUT1 PHASE2 PGND1 10 L1 ISL95901 PHASE1 18 9 0 17 R7 20 BOOT2 PHASE2 VIN1 8 STB2 35 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 A15 A16 A17 A18 A19 A20 A21 A22 A23 A24 A25 A26 A27 A28 A29 A30 C13 R32 R24 OPEN OPEN 4.7UF 4.7UF A A A A A VCC R17 R19 2K 2K R18 D1 MODE D2 2N7002 A P11 Q2 1 2N7002 A R12 100K SW1 3 PWM DCM EN1 P13 GT11MSCBETR R15 OPEN 2 1 SW4 ON OFF EN2 ON OFF 1 DRAWN BY: JUN XIAO DATE: 07/06/2011 RELEASED BY: DATE: UPDATED BY: DATE: ENGINEER: DATE: JUN XIAO TITLE: GT11MSCBETR P14 GT11MSCBETR 3 2 R11 R13 OPEN OPEN PATRICK COURTADE 3/25/2013 ISL95901EVAL1ZD TESTER 2 Q1 1 PG2 R10 100K SW3 3 2 P12 32 32 P10 1 2 PG1 100K 1 1 100K VIN R14 1 11 2 R16 100K VIN 2 VCC MASK# A HRDWR ID REV. N/A A A A FILENAME: D SHEET OF Application Note 1743 0.1UF U1 PHASE1 VIN1 R5 EN2 BOOT1 7 C11 GND EN1 16 A GND PHASE1 100PF FB2 15 1 31.6K EN1 5 BOOT1 6 FB1 36 1 4 10K VSIN2 VO VO VO VO A C19 2 R1 C9 R3 STB2 VSIN1 3 C18 P21 A -VOS FS 2 2 68UF KEY1 BYP5 DNP A 0 2 1 VIN1 VIN1 VIN1 VIN1 A R20 FS P7 1UF C16 A P6 EDGE FINGERS TO DUT C15 VIN VCC P20 PG2 VSOUT2 VCC 40 VCC VSOUT2 BYP5 LDO5 42 41 VIN 43 BYP3P3 3 LDO3P3 PG1 A 1VOUT1 2 J3 4 44 46 0 P18 P17 MODE PG1 R9 45 P22 DNP R22 BYP3P3 LDO5 2 AN1743.0 July 29, 2013 ISL95901EVAL1Z Bill of Materials PART NUMBER QTY UNITS 3 ISL95901EVAL1ZREVDPCB 1 ea H1044-00104-16V10-T 2 ea H1045-00101-50V5-T 2 H1045-00106-16V20-T REFERENCE DESIGNATOR DESCRIPTION MANUFACTURER MANUFACTURER PART IMAGINEERING INC ISL95901EVAL1ZREVDPCB C11, C12 CAP, SMD, 0402, 0.1µF, 16V, 10%, X7R, ROHS VENKEL C0402X7R160-104KNE ea C9, C10 CAP, SMD, 0603, 100pF, 50V, 5%, C0G, ROHS PANASONIC ECJ-1VC1H101J 2 ea C15, C16 CAP, SMD, 0603, 10µF, 16V, 20%, X5R, ROHS TAIYO YUDEN EMK107BBJ106MA-T H1046-00106-25V10-T 4 ea C1-C4 CAP, SMD, 0805, 10µF, 25V, 10%, X5R, ROHS TDK C2012X5R1E106K H1046-00226-6R3V10-T 8 ea C5-C8, C21-C24 CAP, SMD, 0805, 22µF, 6.3V, 10%, X5R, ROHS JOHANSON DIELECTRICS INC 6R3R15X226KV4E H1046-00475-10V10-T 3 ea C13, C14,C17 CAP, SMD, 0805, 4.7µF, 10V, 10%, X5R, ROHS AVX 0805ZD475KAT2A H1046-DNP 0 ea C27-C34 CAP, SMD, 0805, DNP-PLACE HOLDER, ROHS 131-4353-00 4 ea J1-J4 CONN-SCOPE PROBE TEST PT, COMPACT, PCB MNT, TEKTRONIX ROHS 131-4353-00 1514-2 8 ea P1, P2, P4-P9 CONN-TURRET, TERMINAL POST, TH, ROHS KEYSTONE 1514-2 5000 14 ea P10-P23 CONN-MINI TEST PT, VERTICAL, RED, ROHS KEYSTONE 5000 LTST-C190KGKT-T 2 ea D1, D2 LED, SMD, 0603, GREEN CLEAR, 2V, 20mA, 571nm, LITEON/VISHAY 35mcd, ROHS LTST-C190KGKT ETQ-P3W1R0WFN 1 ea L1 COIL-PWR CHOKE, SMD, 7.3x6.6, 1.0µH, 20%, 8.1A, PANASONIC 6.9mΩ, ROHS ETQ-P3W1R0WFN ETQ-P3W1R5WFN 1 ea L2 COIL-PWR CHOKE, SMD, 7.3x6.6, 1.5µH, 20%, 6.6A, PANASONIC 9.8mΩ, ROHS ETQ-P3W1R5WFN ISL95901IRZ 1 ea U1 IC-PMIC SOLUTION, 46P, QFN, 5x5, ROHS INTERSIL ISL95901IRZ 2N7002-7-F-T 2 ea Q1, Q2 TRANSISTOR, N-CHANNEL, 3 LD, SOT-23, 60V, 115mA, ROHS DIODES, INC. 2N7002-7-F H2505-DNP 0 ea R22, R29 RESISTOR, SMD, 0603, 0.1%, MF, DNP-PLACE HOLDER H2510-00R00-1/16W-T 2 ea R7, R8 RES, SMD, 0402, 0Ω, 1/16W, 5%, TF, ROHS VENKEL CR0402-16W-00T H2511-00020-1/10W1-T 1 ea R26 RES, SMD, 0603, 2Ω, 1/10W, 1%, TF, ROHS YAGEO 9C06031A2R00FGHFT Application Note 1743 AN1743.0 July 29, 2013 PWB-PCB, ISL95901EVAL1Z, REVD, ROHS ISL95901EVAL1Z Bill of Materials (Continued) PART NUMBER QTY UNITS REFERENCE DESIGNATOR DESCRIPTION MANUFACTURER MANUFACTURER PART ea R5, R6 RES, SMD, 0603, 20Ω, 1/10W, 1%, TF, ROHS PANASONIC ERJ-3EKF20R0V H2511-00R00-1/10W-T 2 ea R9, R20 RES, SMD, 0603, 0Ω, 1/10W, TF, ROHS VENKEL CR0603-10W-000T H2511-01002-1/10W1-T 2 ea R1, R2 RES, SMD, 0603, 10k, 1/10W, 1%, TF, ROHS KOA RK73H1JT1002F H2511-01003-1/10W1-T 7 ea R10, R12, R14, R16, R18, R21, R23 RES, SMD, 0603, 100k, 1/10W, 1%, TF, ROHS VENKEL CR0603-10W-1003FT H2511-02001-1/10W1-T 2 ea R17, R19 RES, SMD, 0603, 2k, 1/10W, 1%, TF, ROHS KOA RK73H1JTTD2001F H2511-03162-1/10W1-T 1 ea R3 RES, SMD, 0603, 31.6k, 1/10W, 1%, TF, ROHS VISHAY CRCW06033162F H2511-05232-1/10W1-T 1 ea R4 RES, SMD, 0603, 52.3k, 1/10W, 1%, TF, ROHS VENKEL CR0603-10W-5232FT H2511-DNP 0 ea R11, R13, R15, R24, R32 RES, SMD, 0603, DNP-PLACE HOLDER, ROHS H2514-00R00-1/4W-T 2 ea R25, R28 RES, SMD, 1210, 0Ω, 1/4W, TF, ROHS VENKEL CR1210-4W-000 H2514-DNP 0 ea R27 RES, SMD, 1210, DNP, DNP, DNP, TF, ROHS GT11MSCBE-T 4 ea SW1, SW3-SW5 SWITCH-TOGGLE, SMD, 6PIN, SPDT, 2POS, ON-ON, ROHS ITT INDUSTRIES/C&K DIVISION GT11MSCBE 4X6-STATIC-BAG 1 ea PLACE ASSY IN BAG BAG,STATIC, 4x6, ZIPLOC,ROHS ULINE S-2261 DNP 0 ea C18,C19 (16TQC68M) DO NOT POPULATE OR PURCHASE DNP 0 ea P3 (3VH30/1JN5) DO NOT POPULATE OR PURCHASE LABEL-DATE CODE 1 ea AFFIX TO BACK OF PCB LABEL-DATE CODE_BOM REV#_SERIAL# LABEL ON INTERSIL ZIL & QUEL LABEL-DATE CODE Application Note 1743 2 4 H2511-00200-1/10W1-T AN1743.0 July 29, 2013 Application Note 1743 ISL95901EVAL1Z Board Layout FIGURE 1. ASSEMBLY TOP 5 AN1743.0 July 29, 2013 Application Note 1743 ISL95901EVAL1Z Board Layout (Continued) FIGURE 2. SILKSCREEN TOP 6 AN1743.0 July 29, 2013 Application Note 1743 ISL95901EVAL1Z Board Layout (Continued) FIGURE 3. LAYER 1 (PRIMARY SIDE) 7 AN1743.0 July 29, 2013 Application Note 1743 ISL95901EVAL1Z Board Layout (Continued) FIGURE 4. LAYER 2 8 AN1743.0 July 29, 2013 Application Note 1743 ISL95901EVAL1Z Board Layout (Continued) FIGURE 5. LAYER 3 9 AN1743.0 July 29, 2013 Application Note 1743 ISL95901EVAL1Z Board Layout (Continued) FIGURE 6. LAYER 4 10 AN1743.0 July 29, 2013 Application Note 1743 ISL95901EVAL1Z Board Layout (Continued) FIGURE 7. LAYER 5 11 AN1743.0 July 29, 2013 Application Note 1743 ISL95901EVAL1Z Board Layout (Continued) FIGURE 8. BOTTOM LAYER 12 AN1743.0 July 29, 2013 Application Note 1743 ISL95901EVAL1Z Board Layout (Continued) FIGURE 9. SILKSCREEN BOTTOM 13 AN1743.0 July 29, 2013 Application Note 1743 ISL95901EVAL1Z Board Layout (Continued) FIGURE 10. SILKSCREEN BOTTOM 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 14 AN1743.0 July 29, 2013