USER’S MANUAL ISL9440EVAL2Z AN1550 Triple PWM Step-Down Synchronous Buck Controller and One LDO Rev 0.00 Evaluation Board Mar 8, 2010 ISL9440EVAL2Z Evaluation TABLE 1. FEATURES OF ISL944xx FAMILY Board SWITCHING SOFT-STARTING PART EARLY FREQUENCY TIME The ISL9440EVAL2Z evaluation board features the NUMBER WARNING (kHz) (ms) ISL9440. The ISL9440 is a quad-output controller that integrates three PWM synchronous buck controllers and ISL9440 Yes 300 1.7 one low-dropout linear regulator controller. The ISL9440 ISL9440A Yes 600 1.7 offers internal soft-start, independent enable functions and integrates UV/OV/OC/OT protection. Its current ISL9441 No 300 1.7 mode control architecture and internal compensation ISL9440B Yes 300 Programmable network keep peripheral component count minimal. Switching frequency of 300kHz minimizes losses while ISL9440C Yes 600 Programmable the strong gate drivers deliver up to 12A to each PWM The ISL9440EVAL2Z is easy to set up to evaluate the channel. performance of the ISL9440. Please refer to the Table 1 shows the difference in terms of ISL944xx family “Electrical Specifications” table on page2 for typical features. performance summary. FIGURE 1. ISL9440EVAL2Z EVALUATION BOARD AN1550 Rev 0.00 Page 1 of 12 Mar 8, 2010

ISL9440EVAL2Z Electrical Specifications Recommended operation conditions unless otherwise noted. Refer to the “Schematic” on page7 and “Typical Evaluation Board Performance Curves” on page4. PARAMETER TEST CONDITIONS MIN TYP MAX UNITS V All outputs are in regulation 6.0 12 16 V IN V 1 1.45 1.50 1.54 V OUT V 2 2.43 2.50 2.57 V OUT V 3 4.85 5.0 5.15 V OUT V 4 3.20 3.30 2.39 V OUT PWM1 Rated Current V = 12V, T = +25°C, No forced airflow, All 6 7 A IN A three PWM outputs are fully loaded PWM2 Rated Current 6 7 A PWM3 Rated Current 4 5 A LDO Rated Current R = 0, R is not populated 0.8 1.0 A 4 7 V 1 Peak-to-Peak Ripple V = 12V, All three PWM outputs are fully loaded, 29.4 mV OUT IN P-P Oscilloscope is with full bandwidth V 2 Peak-to-Peak Ripple 15.7 mV OUT P-P V 3 Peak-to-Peak Ripple 31.4 mV OUT P-P What’s Inside Quick Test Guide The evaluation board kit contains the following materials: 1. Ensure that the circuit is correctly connected to the supply and electronic loads prior to applying any • The ISL9440EVAL2Z power. Please refer to Figure 2 for proper set-up. • The ISL9440, ISL9440A, ISL9441 Datasheet FN6383 2. Connect Jumpers J , J and J in the ENx positions. 3 4 5 • This Evaluation Board Kit document (AN1550) 3. Turn on the power supply. 4. Adjust input voltage V within the specified range Recommended Equipment IN and observe output voltage. The output voltage The following materials are recommended to perform variation should be within 3%. testing: 5. Adjust load current within the specified range and observe output voltage. The output voltage • 0V to 20V Power Supply with at least 10A source variation should be within 3%. current capability 6. Use oscilloscope to observe output voltage ripple • Three electronic loads capable of sinking current up and phase node ringing. For accurate measurement, to7A please follow setup shown in Figure 3. • Digital Multimeters (DMMs) • 100MHz Quad-Trace Oscilloscope • Signal Generator (for load transient tests) AN1550 Rev 0.00 Page 2 of 12 Mar 8, 2010

ISL9440EVAL2Z FIGURE 2. PROPER TEST SET-UP Load Transient Circuit Set-up 1. Select a SOIC8 N-Channel MOSFET with VDS breakdown >20V. 2. Install the load transient circuit as indicated on the schematic. Refer to Figure 4 for detail. OOOUUUTTPTPUPUTUT TC C ACAPA P P 3. R , R and R are 10k resistors for discharging OOORRR MMMOOOSSSFEFFTEE TT 27 22 25 the MOSFET gates. 4. R , R and R are current sensing resistors to 26 23 24 monitor the load step. For accurate measurement, FIGURE 3. PROPER PROBE SET-UP TO MEASURE please use 5% tolerance sensing resistor or better. OUTPUT RIPPLE AND PHASE NODE To alleviate thermal stress, use 0.1or smaller RINGING resistance. The resistance of the sensing resistors sets the current scale on the oscilloscope. 5. Apply pulse square waveform across R , R or 27 22 R . The duty cycle of the pulse waveform should be 25 small (<5%) to limit thermal stress on current sensing resistor and the MOSFETs (M , M or M ). 8 6 7 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. 7. Monitor overshoot and undershoot at corresponding output. AN1550 Rev 0.00 Page 3 of 12 Mar 8, 2010

ISL9440EVAL2Z . OPT. LOAD TRAN. OPT R27 M8 OPT R26 OPT FIGURE 4. LOAD TRANSIENT CIRCUIT FOR PWM1 Typical Evaluation Board Performance Curves V = 12V, IN Unless Otherwise Noted. 95 100 VIN = 9V VIN = 9V 90 95 85 (%) 7850 VIN = 12V VIN = 16V Y (%) 8950 VIN = 12V VIN = 16V Y C 80 C 70 N EN 65 CIE 75 FFICI 60 EFFI 6750 E 55 50 60 45 55 40 50 0 1 2 3 4 5 6 7 8 0 1 2 3 4 5 6 7 LOAD CURRENT (A) LOAD CURRENT (A) FIGURE 5. PWM1 EFFICIENCY vs LOAD (V = 1.5V) FIGURE 6. PWM2 EFFICIENCY vs LOAD (V = 2.5V) O O 100 VIN = 9V 1.510 95 90 %) 85 VIN = 12V VIN = 16V 1.505 NCY ( 7850 (V)T1 1.500 E U CI 70 VO I F F 65 E 1.495 60 55 50 1.490 0 1 2 3 4 5 5 7 9 11 13 15 17 19 LOAD CURRENT (A) INPUT VOLTAGE (V) FIGURE 7. PWM3 EFFICIENCY vs LOAD (V = 5.0V) FIGURE 8. PWM1 LINE REGULATION (I = I = 6A, O O1 O2 I = 4A) O3 AN1550 Rev 0.00 Page 4 of 12 Mar 8, 2010

ISL9440EVAL2Z Typical Evaluation Board Performance Curves V = 12V, IN Unless Otherwise Noted. (Continued) 2.510 5.025 2.505 5.000 V) V) V (OUT2 2.500 V (OUT2 4.975 2.495 4.950 2.490 4.925 5 7 9 11 13 15 17 19 5 7 9 11 13 15 17 19 INPUT VOLTAGE (V) INPUT VOLTAGE (V) FIGURE 9. PWM2 LINE REGULATION (I = I = 6A, FIGURE 10. PWM3 LINE REGULATION (I = I = 6A, O1 O2 O1 O2 I = 4A) I = 4A) O3 O3 1.510 2.510 1.505 2.505 V) V) (OUT1 1.500 (OUT2 2.500 V V 1.495 2.495 1.490 2.490 0 1 2 3 4 5 6 7 8 0 1 2 3 4 5 6 7 8 LOAD CURRENT (A) LOAD CURRENT (A) FIGURE 11. PWM1 LOAD REGULATION (V = 12V, FIGURE 12. PWM2 LOAD REGULATION (V = 12V, IN IN I = 6A, I = 4A) I = 6A, I = 4A) O2 O3 O1 O3 5.025 VOUT1(AC), 10mV/DIV 5.000 ) V ( 2 4.975 T U O V 4.950 4.925 1µs/DIV 0 1 2 3 4 5 LOAD CURRENT (A) FIGURE 13. PWM3 LOAD REGULATION (V = 12V, FIGURE 14. PWM1 OUTPUT RIPPLE UNDER MAX LOAD IN I = 6A, I = 3A) (V = 12V, I = I = 6A, I = 4A, FULL O1 O2 IN O1 O2 O3 BANDWIDTH) AT V = 1.5V O AN1550 Rev 0.00 Page 5 of 12 Mar 8, 2010

ISL9440EVAL2Z Typical Evaluation Board Performance Curves V = 12V, IN Unless Otherwise Noted. (Continued) VOUT2(AC), 10mV/DIV VOUT3(AC), 20mV/DIV 1µs/DIV 1µs/DIV FIGURE 15. PWM2 OUTPUT RIPPLE UNDER MAX LOAD FIGURE 16. PWM3 OUTPUT RIPPLE UNDER MAX LOAD (V = 12V, I = I = 6A, I = 4A, FULL (V = 12V, I = I = 6A, I = 4A, FULL IN O1 O2 O3 IN O1 O2 O3 BANDWIDTH) AT V = 2.5V BANDWIDTH) AT V = 5V O O VOUT1(AC), 50mV/DIV VOUT2(AC, 50mV/DIV) ISTEP, 2A/DIV ISTEP, 2A/DIV 50µs/DIV 50µs/DIV FIGURE 17. PWM1 LOAD TRANSIENT RESPONSE FIGURE 18. PWM2 LOAD TRANSIENT RESPONSE (LOAD STEP FROM 1.5A TO 4.5A) AT (LOAD STEP FROM 1.5A TO 4.5A) AT V =1.5V V =2.5V O O VOUT1, 1V/DIV VOUT2, 1V/DIV VOUT3(AC), 20mV/DIV VOUT3, 2V/DIV VOUT4, 1V/DIV ISTEP, 1A/DIV 500µs/DIV 50µs/DIV FIGURE 19. PWM3 LOAD TRANSIENT RESPONSE FIGURE 20. SOFT-START WAVEFORMS (LOADSTEP FROM 1A TO 3A) AT V = 5V O AN1550 Rev 0.00 Page 6 of 12 Mar 8, 2010

MA Schematic IS aN L r 815 94 , 250 40 0 E 1R V 0e A v 0 L2 .0 Z 0 P a g e 7 o f 1 2

ISL9440EVAL2Z TABLE 2. BILL OF MATERIALS ESSENTIAL COMPONENTS ITEM QTY PART REFERENCE VALUE DESCRIPTION PART # MANUFACTURER 1 3 CB1, CB2, CB3 0.1µF CAP Ceramic X7R, 16V, SMD, 0603 Generic 2 1 CFIN1 0.47µF CAP Ceramic Y5V, 50V, SMD, 0603 Generic 3 2 CIN1, CIN2 100µF Alum. Elec. CAP 35V EEU-FC1V101 Panasonic 4 4 CIN3, CIN4, CIN5, CIN6 10µF CAP Ceramic X5R, 35V, SMD, 1210 Generic 5 3 CL1, CL2, CL3 820pF CAP Ceramic X5R, 50V, SMD, 0603 Generic 6 2 CO11, CO12 330µF POSCAP, 2.5V, SMD, D2E 2R5TPE330M7 Sanyo 7 5 CO13, CO14, CO24, 10µF CAP Ceramic X5R, 6.3V, SMD, 0805 Generic CO33,CO41 8 2 CO21, CO22 330µF POSCAP, 6.3V, SMD, D3L 6TPF330M9L Sanyo 9 1 CO31 220uF POSCAP, 6.3V, SMD 6TPE220MI Sanyo 10 1 CO42 100µF POSCAP, 4.0V, SMD, B 4TPE100MZB Sanyo 11 1 CVCC1 4.7µF CAP Ceramic X5R, 6.3V, SMD, 0805 Generic 12 1 Cff1 220pF CAP Ceramic X7R, 50V, SMD, 0603 Generic 13 1 Cff2 1200pF CAP Ceramic X7R, 50V, SMD, 0603 Generic 14 1 Cff3 270pF CAP Ceramic X7R, 50V, SMD, 0603 15 1 C1 0.22µF CAP Ceramic X5R, 16V, SMD, 0603 Generic 16 1 C2 22pF CAP Ceramic X5R, 16V, SMD, 0603 Generic 17 1 C3 1µF CAP Ceramic X5R, 16V, SMD, 0603 Generic 18 1 L1 2.0µH SHIELDED INDUCTOR #744325550 Wurth 19 1 L2 2.8µH SHIELDED INDUCTOR #7443552280 Wurth 20 1 L3 5.5µH SHIELDED INDUCTOR #744325550 Wurth 21 3 M1, M2, M3 Dual N MOSFET, 30V, SOIC8 IRF7907 International Rectifier 22 1 M4 P MOSFET, SOIC8 Si4423DY Vishay 23 1 R 10 RESISTOR, SMD, 0805, 10% Generic FIN1 24 3 RL1, RL2, RL3 1.2 RESISTOR, SMD, 0603, 10% Generic 25 1 RPG1 100k RESISTOR, SMD, 0603, 1% Generic 26 1 ROC1, ROC3 120k RESISTOR, SMD, 0603, 1% Generic 27 1 ROC2 160k RESISTOR, SMD, 0603, 1% Generic 28 2 R , R 1.5k RESISTOR, SMD, 0603, 1% Generic SEN1 SEN3 29 1 R 2k RESISTOR, SMD, 0603, 1% Generic SEN2 30 1 R1 9.31k RESISTOR, SMD, 0603, 1% Generic 31 1 R2 10.7k RESISTOR, SMD, 0603, 1% Generic 32 1 R3 105k RESISTOR, SMD, 0603, 1% Generic 33 1 R5 51 RESISTOR, SMD, 0603, 1% Generic 34 1 R6 20k RESISTOR, SMD, 0603, 1% Generic 35 1 R8 24.3k RESISTOR, SMD, 0603, 1% Generic 36 1 R9 15k RESISTOR, SMD, 0603, 1% Generic 37 1 R10 4.75k RESISTOR, SMD, 0603, 1% Generic AN1550 Rev 0.00 Page 8 of 12 Mar 8, 2010

ISL9440EVAL2Z TABLE 2. BILL OF MATERIALS (Continued) ESSENTIAL COMPONENTS ITEM QTY PART REFERENCE VALUE DESCRIPTION PART # MANUFACTURER 38 1 R11 11.5k RESISTOR, SMD, 0603, 1% Generic 39 1 U1 QUAD OUTPUT CONTROLLER ISL9440IRZ Intersil OPTIONAL COMPONENTS OR RESISTOR JUMPERS ITEM QTY REFERENCE VALUE DESCRIPTION PART # MANUFACTURER 40 10 R4, R12, R13, R14, 0 RESISTOR Jumpers, SMD, 0603, 10% Generic R15, R16, R17, R18, R19, R20, R21 41 2 CO23, CO32 CO34 DNP 42 3 Cp1, Cp2, Cp3 DNP 42 1 M5 DNP P MOSFET TO-252 43 3 M6, M7, M8 DNP N MOSFET 44 4 R7, R22, R25, R27 DNP RESISTOR, SMD, 0603 45 3 R23, R24, R26 DNP RESISTOR, SMD, 1206 EVALUATION BOARD HARDWARE ITEM QTY REFERENCE VALUE DESCRIPTION PART # MANUFACTURER 46 3 J3, J4, J5 3 Head Jumper 68000-236HLF Generic 47 11 TP1, TP2, TP3, TP4, TEST POINT 5007 Keystone TP6, TP17, TP11, TP12, TP13, TP14, TP7 48 9 TP8, TP10, TP16, TP19, GND TURRET 1514-2 Keystone TP21, TP9, TP5, TP15, TP20 AN1550 Rev 0.00 Page 9 of 12 Mar 8, 2010

MA ISL9440EVAL2Z PCB Layout IS aN L r 815 94 , 250 40 0 E 1R V 0e A v 0 L2 .0 Z 0 FIGURE 21. TOP LAYER FIGURE 22. SECOND LAYER (SOLID GROUND) P a g e 1 0 o f 1 2

MaAN ISL9440EVAL2Z PCB Layout (Continued) ISL r 815 94 , 250 40 0 E 1R V 0e A v 0 L2 .0 Z 0 FIGURE 23. THIRD LAYER FIGURE 24. BOTTOM LAYER P a g e 1 1 o f 1 2

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