ISL9440CEVAL1Z: Triple PWM Step-Down Synchronous Buck Controller and One LDO ® Application Note June 30, 2009 ISL9440CEVAL1Z Evaluation Board AN1482.0 TABLE 1. FEATURES OF ISL944xx FAMILY The ISL9440CEVAL1Z evaluation board features the ISL9440C. The ISL9440C is quad-output controller that integrates three PWM synchronous buck controllers and one low-dropout linear regulator controller. The ISL9440C offers programmable soft-start, independent enable functions and integrates OV/OC/OT protection. The current mode control architecture and internal compensation network keep peripheral component counts minimized. 600kHz switching frequency can minimize inductor size while the strong gate driver is able to deliver 12A to each PWM channel. Table 1 shows the difference in terms of ISL944xx family features. EARLY WARNING SWITCHING FREQUENCY (kHz) SOFT-STARTING TIME (ms) ISL9440 YES 300 1.7 ISL9440A YES 600 1.7 ISL9441 NO 300 1.7 ISL9440B YES 300 PROGRAMMABLE ISL9440C YES 600 PROGRAMMABLE PART NUMBER The ISL9440CEVAL1Z is easy to set up to evaluate the performance of the ISL9440C. Please refer to the “Electrical Specifications” for typical performance summary. FIGURE 1. ISL9440CEVAL1Z EVALUATION BOARD 1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2009. All Rights Reserved All other trademarks mentioned are the property of their respective owners. Application Note 1482 Electrical Specifications Recommended operation conditions unless otherwise noted. Refer to schematic and typical performance curves. PARAMETER TEST CONDITIONS MIN TYP MAX UNITS 6.0 12 16 V VOUT1 0.97 1.00 1.03 V VOUT2 3.25 3.32 3.4 V VOUT3 4.85 5.0 5.15 V VOUT4 2.43 2.50 2.57 V 6 7 A 6 7 A 4 5 A 1.0 A VIN All outputs are in regulation VIN =12V, TA = +25°C, No forced airflow, All three PWM outputs are fully loaded PWM1 Rated Current PWM2 Rated Current PWM3 Rated Current LDO Rated Current R7 = 0Ω, R4 is not populated 0.8 VOUT1 Peak-to-Peak Ripple VIN = 12V, All three PWM outputs are fully loaded, Oscilloscope is with full bandwidth 19.8 mVP-P 59.6 mVP-P 66.5 mVP-P VOUT2 Peak-to-Peak Ripple VOUT3 Peak-to-Peak Ripple What’s Inside Quick Test Guide The Evaluation Board Kit contains the following materials: • The ISL9440CEVAL1Z • The ISL9440B, ISL9440C datasheet 1. Ensure that the circuit is correctly connected to the supply and electronic loads prior to applying any power. Please refer to Figure 2 for proper set-up. • This EVAL KIT document 2. Connect Jumpers J3, J4 and J5 in the ENx positions. Recommended Equipment 3. Turn on the power supply The following materials are recommended to perform testing: 4. Adjust input voltage VIN within the specified range and observe output voltage. The output voltage variation should be within 3%. • 0V to 20V Power Supply with at least 10A Source Current Capability • Three Electronic Loads Capable of Sinking Current up to 7A 5. Adjust load current within the specified range and observe output voltage. The output voltage variation should be within 3%. • Digital Multimeters (DMMs) • 100MHz Quad-Trace Oscilloscope • Signal Generator (for load transient tests) 2 6. Use oscilloscope to observe output voltage ripple and Phase node ringing. For accurate measurement, refer to Figure 3 for proper test set-up. AN1482.0 June 30, 2009 Application Note 1482 V Io1 + _ V LOAD Vo2 Io2 + A + _ Vo1 + VIN - + _ + _ A LOAD V A + _ V LOAD Vo3 Io3 + A FIGURE 2. PROPER TEST SET-UP 3. R27, R22 and R25 are 10kΩ resistors for discharging the MOSFET gates. OUTPUT CAP OUTPUT OUTPUT CAP CAP OR MOSFET OR MOSFET FIGURE 3. PROPER PROBE SET-UP TO MEASURE OUTPUT RIPPLE AND PHASE NODE RINGING Load Transient Circuit Set-up 4. R26, R23 and R24 are current sensing resistors to monitor the load step. For accurate measurement, please use 5% tolerance sensing resistor or better. To alleviate thermal stress, use 0.1Ω or smaller resistance. The resistance of the sensing resistors sets the current scale on the oscilloscope. 5. Apply pulse square waveform across R27, R22 or R25. The duty cycle of the pulse waveform should be small (<5%) to limit thermal stress on current sensing resistor and the MOSFETs (M8, M6 or M7) 1. Select a SOIC8 N-Channel MOSFET with VDSS breakdown > 20V. 6. The amplitude of the clock sets the current step amplitude. Adjust the clock amplitude and slew rate to set the current step and slew rate. 2. Install the load transient circuit as indicated on the schematic. Refer to Figure 4 for detail. 7. Monitor overshoot and undershoot at corresponding output. 3 AN1482.0 June 30, 2009 Application Note 1482 . OPT. LOAD TRAN. OPT R27 OPT M8 R26 OPT FIGURE 4. LOAD TRANSIENT CIRCUIT FOR PWM1 Typical Evaluation Board Performance Curves 90 VIN = 12V, Unless Otherwise Noted. 100 VIN = 9VDC 85 90 75 VIN = 12VDC EFFICIENCY (%) EFFICIENCY (%) 80 70 VIN = 16VDC 65 60 55 85 70 65 45 55 1 2 3 4 5 LOAD CURRENT (A) 6 7 8 FIGURE 5. PWM1 EFFICIENCY vs LOAD (VO = 1.0V) 100 VIN = 16VDC 75 60 0 VIN = 12VDC 80 50 40 VIN = 9VDC 95 50 0 1 2 3 4 5 LOAD CURRENT (A) 6 7 8 FIGURE 6. PWM2 EFFICIENCY vs LOAD (VO = 3.3V) VIN = 9VDC 95 EFFICIENCY (%) 90 VOUT1(AC), 10mV/DIV VIN = 12VDC 85 80 VIN = 16VDC 75 70 65 60 55 50 0 1 2 3 4 LOAD CURRENT (A) 5 FIGURE 7. PWM3 EFFICIENCY vs LOAD (VO = 5.0V) 4 6 500ns/DIV FIGURE 8. PWM1 OUTPUT RIPPLE UNDER MAX LOAD (VIN = 12V, IO1 = IO2 = 6A, IO3 = 4A, FULL BANDWIDTH) AN1482.0 June 30, 2009 Application Note 1482 Typical Evaluation Board Performance Curves VIN = 12V, Unless Otherwise Noted. (Continued) VOUT3(AC), 50mV/DIV VOUT2(AC), 50mV/DIV 500ns/DIV 500ns/DIV FIGURE 9. PWM2 OUTPUT RIPPLE UNDER MAX LOAD (VIN = 12V, IO1 = IO2 = 6A, IO3 = 4A, FULL BANDWIDTH) FIGURE 10. PWM3 OUTPUT RIPPLE UNDER MAX LOAD (VIN = 12V, IO1 = IO2 = 6A, IO3 = 4A, FULL BANDWIDTH) VOUT2(AC, 100mV/DIV) VOUT1(AC), 50mV/DIV ISTEP, 2A/DIV ISTEP, 2A/DIV 50µs/DIV 50µs/DIV FIGURE 11. PWM1 LOAD TRANSIENT RESPONSE (LOAD STEP FROM 1.5A TO 4.5A) FIGURE 12. PWM2 LOAD TRANSIENT RESPONSE (LOAD STEP FROM 1.5A TO 4.5A) VOUT1, 1V/DIV VOUT3(AC), 100mV/DIV VOUT2, 2V/DIV VOUT4, 2V/DIV ISTEP, 1A/DIV VOUT3, 2V/DIV 50µs/DIV FIGURE 13. PWM3 LOAD TRANSIENT RESPONSE (LOAD STEP FROM 1A TO 3A) 5 1ms/DIV FIGURE 14. SOFT START WAVEFORMS AN1482.0 June 30, 2009 Schematic TP1 VIN VIN+ TP20 1 VIN 1 VIN VIN CIN1 VINTP21 1 GND TP2 100u 25V OPT. Load Tran. CIN2 100u 25V 1 VIN- UG1 Q1 M2 IRF7907 Q2 PH2 UG2 CIN6 10u 25V 10u 25V CIN3 VO1 1 PH1 L1 1V @ 6A CO14 CO13 CO12 CO11 10u 6.3V 10u 6.3V DNP 6.3V 330u 2.0V LG1 R15 6 M8 Sany o, 2R5TPE330M7 L2 0 0 CL1 820p R26 DNP CB1 0.1u R13 0 R14 0 CL2 820p CB2 0.1u 1 VO2 TP7 1.8u RL2 1.2 R16 DNP R27 DNP R23 DNP VO2 LG2 RL1 1.2 OPT. Load Tran. R22 DNP M6 TOKO, #919AS-1R8N Q2 1.0u 1 DNP 10u 25V TOKO, #919AS-1R0N TP5 VO1 TP6 Q1 M1 IRF7907 CIN5 CO21 CO22 CO23 CO24 220u 6.3V DNP 6.3V DNP 10V 10u 6.3V 3.3V @ 5.0A+1.0A 1 TP8 GND 1 TP19 GND Sany o, 6TPE220MI TP3 PGOOD R2 102K 1% RST_N TP4 26 27 25 PHASE2 BOOT2 28 LGATE2 UGATE2 30 29 LGATE1 UGATE1 BOOT1 ISEN3 EN/SS3 LG3 R18 0 R17 0 20 R4 DNP 0.1u 16V PH3 TOKO, #919AS-2R8M VO3 L3 Rsen3 18 3.32K TP9 VO3 1 2.8u 19 RL3 1.2 17 CO31 CO32 CO33 CO34 220u 6.3V DNP 6.3V 10u 6.3V DNP 6.3V 5V @ 4A 1 TP10 GND Sany o, 6TPE220MI CL3 820p R20 0 R3 105K 1% R5 51 C1 0.22u R12 0 1 Cf f 3 VO2 1u R19 0 R8 107K 1% ROC3 200K FB2 1 2 EN3 Css3 ROC2 200K M5 DNP 2 100p FB3 C3 J4 EN3 1 VO3 CB3 R6 20K 1% 10n Cp3 J5 EN2 Cf f 2 100p 2 TP15 R9 21.5K 1% 1 LDOFB 10n C2 2.5V @ 1.0A TP16 GND Css2 1 CO41 CO42 10u 100u 4.0V 4TPE100MZB 1 2 1 TP14 EN2 3 Enabled Disabled 3 VO4 3 Enabled Disabled DNP M4 Si4423DY TP13 EN3 3 R7 0 R24 DNP Q2 21 1 VO2 R25 DNP M7 10u 25V 1 RST PHASE3 OCSET1 33 3.3n ROC1 100K FB1 M3 IRF7907 23 22 FB3 Cp1 8 UG3 24 16 2.2n PAD Cf f 1 BOOT3 OCSET3 7 1 UGATE3 ISL9440C EN/SS1 15 6 VIN EN/SS2 VO1 R1 25.5K 1% FB2 5 10n R21 0 14 EN1 LGATE3 13 3 4 PGND VCC_5V DNP CIN4 Q1 ISEN2 PGOOD OCSET2 2 3 3 TP17 GND 1 2 Css1 35V VCC5V SGND 1 Enabled Disabled J3 EN1 SVIN CFIN1 1 12 16V 2 TP12 EN1 ISEN1 11 0.47u 1 LDOFB CVCC1 4.7u OPT. Load Tran. VIN Rsen2 3.32K Application Note 1482 10 G4 VIN RFIN1 10 1 PHASE1 Rsen1 1.82K TP11 Int. VCC U1 32 16V 31 16V RPG1 100K 9 1 PGOOD 22p R10 10K 1% R11 34K 1% Cp2 DNP Title ISL9440CEVAL1Z EVALUATION BOARD Size Date: Document Number <Doc> Monday , May 11, 2009 Rev B Sheet 1 of 1 AN1482.0 June 30, 2009 Application Note 1482 TABLE 2. BILL OF MATERIALS ESSENTIAL COMPONENTS ITEM QTY PART REFERENCE 1 3 CB1, CB2, CB3 0.1µF CAP Ceramic X5R, 16V, SMD, 0603, Generic 2 1 CFIN1 0.47µF CAP Ceramic X5R, 25V, SMD, 0603, Generic 3 2 CIN1, CIN2 100µF Alum. Elec. CAP 25V Panasonic 4 4 CIN3, CIN4, CIN5, CIN6 10µF CAP Ceramic X5R, 25V, SMD, 1206, Generic 5 3 CL1, CL2, CL3 820pF CAP Ceramic X5R, 16V, SMD, 0603, Generic 6 1 CO11 330µF POSCAP, 2.0V, SMD, D2E 7 5 CO13, CO14, CO24, CO33, CO41 10µF CAP Ceramic X5R, 6.3V, SMD, 0805 8 2 CO21, CO31 220µF POSCAP, 6.3V, SMD, D2E 6TPE220MI Sanyo 9 1 CO42 100µF POSCAP, 4.0V, SMD, B 4TPE100MZB Sanyo 10 1 CVCC1 4.7µF CAP Ceramic X5R, 16V, SMD, 0805, Generic 11 1 Cff1 2.2nF CAP Ceramic, SMD, 0603, Generic 12 2 Cff2, Cff3 100pF CAP Ceramic, SMD, 0603, Generic 13 1 Cp1 3.3nF CAP Ceramic, SMD, 0603, Generic 14 3 Css1, Css2, Css3 10nF CAP Ceramic, SMD, 0603, Generic 15 1 C1 0.22µF CAP Ceramic X5R, 16V, SMD, 0603, Generic 16 1 C2 22pF CAP Ceramic, SMD, 0603, Generic 17 1 C3 1µF CAP Ceramic, 6.3V,SMD, 0603, Generic 18 1 L1 1.0µH SHIELDED INDUCTOR #919AS-1R0N TOKO 19 1 L2 1.8µH SHIELDED INDUCTOR #919AS-1R8N TOKO 20 1 L3 2.8µH SHIELDED INDUCTOR #919AS-2R8M TOKO 21 3 M1, M2, M3 Dual N MOSFET, 30V , SOIC8 IRF7907 International Rectifier 22 1 M4 P MOSFET, SOIC8 Si4423DY Vishay 23 1 RFIN1 10Ω RESISTOR, SMD, 0805, 10% Generic 24 3 RL1, RL2, RL3 1.2Ω RESISTOR, SMD, 0603, 10% Generic 25 2 RPG1, ROC1 100kΩ RESISTOR, SMD, 0603,1% Generic 26 2 ROC2, ROC3 200kΩ RESISTOR, SMD, 0603,1% Generic 27 1 RSEN1 1.82kΩ RESISTOR, SMD, 0603,1% Generic 28 2 RSEN2, RSEN3 3.32kΩ RESISTOR, SMD, 0603,1% Generic 29 1 R1 25.5kΩ RESISTOR, SMD, 0603,1% Generic 30 1 R2 102kΩ RESISTOR, SMD, 0603,1% Generic 31 1 R3 105kΩ RESISTOR, SMD, 0603,1% Generic 32 1 R5 51Ω RESISTOR, SMD, 0603,1% Generic 33 1 R6 20kΩ RESISTOR, SMD, 0603,1% Generic 34 1 R8 107kΩ RESISTOR, SMD, 0603,1% Generic 35 1 R9 21.5kΩ RESISTOR, SMD, 0603,1% Generic 36 1 R10 10kΩ RESISTOR, SMD, 0603,1% Generic 37 1 R11 34kΩ RESISTOR, SMD, 0603,1% Generic 38 1 U1 - 7 VALUE DESCRIPTION QUAD OUTPUT CONTROLLER PART # 2R5TPE330M7 MANUFACTURER Sanyo Generic ISL9440C Intersil AN1482.0 June 30, 2009 Application Note 1482 TABLE 2. BILL OF MATERIALS (Continued) OPTIONAL COMPONENTS OR RESISTOR JUMPERS ITEM QTY REFERENCE VALUE 39 10 R7, R12, R13, R14, R15, R16, R17, R18, R19, R20, R21 40 3 CO12, CO22, CO32 DNP 41 2 CO23, CO34 DNP 42 2 Cp2, Cp3 DNP 43 1 M5 DNP P MOSFET TO-252 44 3 M6, M7, M8 DNP N MOSFET 45 4 R4, R22, R25, R27 DNP RESISTOR, SMD, 0603 46 3 R23, R24, R26 DNP RESISTOR, SMD, 1206 0 DESCRIPTION PART # RESISTOR Jumpers, SMD, 0603, 10% MANUFACTURER Generic EVALUATION BOARD HARDWARES ITEM QTY REFERENCE VALUE DESCRIPTION PART # MANUFACTURER 47 3 J3, J4, J5 - 3 Head Jumper 68000-236HLF Generic 48 11 TP1, TP2, TP3, TP4, TP6, TP17, TP11, TP12, TP13, TP14, TP7 - TEST POINT 5007 Keystone 49 9 TP8, TP10, TP16, TP19, TP21, TP9, TP5, TP15, TP20 GND TURRET 1514-2 Keystone 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 8 AN1482.0 June 30, 2009 ISL9440CEVAL1Z PCB Layout 9 Application Note 1482 FIGURE 15. TOP COMPONENTS FIGURE 16. TOP LAYER AN1482.0 June 30, 2009 ISL9440CEVAL1Z PCB Layout (Continued) 10 Application Note 1482 FIGURE 17. SECOND LAYER (SOLID GROUND) FIGURE 18. THIRD LAYER AN1482.0 June 30, 2009 ISL9440CEVAL1Z PCB Layout (Continued) 11 Application Note 1482 FIGURE 19. BOTTOM LAYER (MIRRORED) FIGURE 20. BOTTOM COMPONENTS (MIRRORED) AN1482.0 June 30, 2009