ISL6237EVAL1 Evaluation Kit ® Application Note This application note describes the ISL6237 evaluation board intended for applications in notebook computers and other battery-powered devices. Description As notebook computer and battery-powered equipment complexity increases, higher levels of power management integration are required to meet market demands. To respond to the dynamic needs of its customers, Intersil introduces the quad outputs, multi-function power supply controller ISL6237. Its two fully programmable Switch-Mode Power Supplies (SPMS), one programmable and one fixed LDO outputs provide a robust power management solution for an extremely wide range of applications. In addition, it includes an optional 14V charge pump. For more information on the detailed workings of the ISL6237, please consult the ISL6237 Data Sheet on the Intersil Company website (http://www.intersil.com) September 23, 2008 AN1302.1 Quick Setup Guide 1. Set the +25V power supply to +7V and place in the “STANDBY” or “OFF” position. Connect the positive terminal (+) of the supply to the +VIN terminal P1 and the negative terminal (-) of the supply to GND P2. 2. Connect the positive terminal (+) of the electronic load to the VOUT1 terminal P5. Connect the negative terminal (-) of the electronic load to the GND terminal P6. Make sure the electronic load is set to the 0A condition. 3. Check to ensure all switches are in their default positions prior to application of power (refer to “Detailed Description of Switch Settings.” on page 2). 4. Set all power supplies to the “ON” position. Check both 5V and 25V power supply outputs with a DMM to ensure correct voltage levels. Adjust if necessary. 5. Measure the default output voltages using DMM across the test points. •VOUT1: P7(+) to P8(-), it should read 5.0V •VOUT2: P5(+) to P6(-), It should read 3.3V What’s Inside The Evaluation Board Kit contains the following materials: •LDO: P3(+) to P4(-), It should read 3.3V •VREF3: P14(+) to P8(-), It should read 3.3V • ISL6237 EVAL1 REV B Board •CHARGE PUMP: P28(+) to P8(-), it should read 14.0V. • ISL6237 Data Sheet • ISL6237 Application Note (this document) At this point, the board has been properly powered up. Normal testing can begin. What’s Needed Summary The following materials will be needed to perform testing: The ISL6237EVAL1 is an adaptable evaluation tool which showcases the performance of the ISL6237 chipset designed to meet the power management requirements of personal notebook computers or portable devices. • +25V, 20A Power Supply • +5.0V, 750mA Power Supply • Electronic Load up to 15A The following pages provide jumper settings, pinout, schematic of the board, bill of materials and layout drawings to support implementation of this solution. • Precision digital multimeter • 4-Channel oscilloscope Note: amperage rating of power supplies are determined by maximum expected loading plus a percentage margin of error. The Intersil’s total power management portfolio continues to expand with new selections to better fit our customer’s needs. Refer to our web site for updated information: http://www.intersil.com For technical assistance or other assistance please call 1-888-INTERSIL (468-3774). 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. 2007, 2008. All Rights Reserved All other trademarks mentioned are the property of their respective owners. Application Note 1302 Detailed Description of Switch Settings. SWITCH NAME FUNCTION POSITION CONNECTION SW1 EN2 VOUT2 OUTPUT CONTROL 1 EN2 to GND. VOUT2 output shut-down. 2 EN2 to VCC. VOUT2 output active. 3 EN2 to REF. VOUT2 sequence to VOUT1 output. 1 BYP to GND Sets BYP to 0V, no LDO switchover 2 BYP to Vout1 Sets BYP to Vout1 3 BYP to Vout2 Sets BYP to Vout2 1 LDO to GND LDO output shut-down 2 LDO to VCC LDO output active 3 N/C 1 EN1 to GND. VOUT1 output shut-down. 2 EN1 to VCC. VOUT1 output active. 3 EN1 to REF. VOUT1 sequence to VOUT2 output. 1 SKIP# to GND Normal Operation Mode, allow automatic PWM/PFM switchover for pulse -skipping at light load 2 SKIP# to VCC Low Noise, Fixed-frequency PWM Mode 3 SKIP# to REF Ultrasonic pulse-skipping mode(20KHz Min) SW3 SW4 SW5 BYP EN_LDO OPERATING MODE LDO CONTROL EN1 SKIP# Evaluating Variable Output Voltage No connect Pinouts The ISL6237EVAL1 kit outputs are preset to 5V/7A, 3.3V/11A and 5V/200mA on LDO. 2 SKIP# POK2 EN2 UGATE2 PHASE2 31 30 29 28 27 26 25 2 23 LGATE VCC 3 22 PGND EN_LDO 4 21 GND N/C 5 20 N/C VIN 6 19 PVCC LDO 7 18 LGATE LDOREFIN 8 17 BOOT1 9 10 11 12 13 14 15 UGATE1 TON EN1 24 BOOT2 POK1 1 ILIM1 REF FB1 The VOUT2 can track REFIN2 at 1:1 ratio with input voltage range from 0.7V to 2.5V. Likewise, the LDO output can also track LDOREFIN at 1:2 with voltage range from 0.35V to 2.25V. 32 OUT1 where VFB = 0.7V OUT2 (EQ. 1) BYP R13 R14 = --------------------------------------------( V OUT ⁄ V FB ) – 1 ILIM2 The VOUT1 can also be adjusted between 0.7V to 5.5V by changing the value of R13 and R14 given by Equation : REFIN2 ISL6237 (32 LD 5X5 QFN) TOP VIEW 16 PHASE1 SW2 RESULT AN1302.1 September 23, 2008 I 1 P18 R22 P3 5 0.1UF R5 SW3 EN1 POK1 P24 POK2 1 2 3 1 P17 C26 3 0.1UF C24 2 1 C31 DNP D1 DNP 1 2 1 C29 2 3 1 DNP 3 D8 OPEN R6 C5 P28 SW4 1 2 3 P16 330UF 0.1UF 3 1 C23 D6 2 DNP 1 OPEN 330UF C32 2 1 D7 1 2 200K 200K R4 1 1 2 P23 4 P8 DNP OPEN VOUT2 61 5 VOUT1 4 6 5 4 C12 C2 VCC OPEN OPEN 1 2 3 P15 DNP R26 DNP C30 5 2 4 C28 6 OPEN 3 C17 1 7 D5 1 8 Q4 2 DNP IRF7811AV PVCC OPEN 1 EN_LDO P27 R34 BYP AN1302.1 September 23, 2008 FIGURE 1. ISL6237EVAL1 REV B KIT SCHEMATIC R33 DNP SKIP# P7 VOUT1 1 2 C6 C1 1UF L1 4.7UH C13 1 2 3 4 4 3 6 OPEN P12 2 3 C15 2 7 R32 EN2 0 R17 1 0.1UF 1 3 2 3 1 2 P21 DNP 1 DNP C16 R8 17 PHASE1 1 6 5 4 R14 P6 VIN 8 Q3 10UF 1 18 FB1 1 1 2 P22 4 1 OPEN 1 2 3 1 2 3 P11 R25 DNP IRF7807V OPEN 6 5 4 D4 5 TON SW5 1 C27 6 4 IRF7811AV P30 SW2 VOUT2 P5 OPEN 7 3 REF 6 5 4 C14 10UF 2 R23 SW1 1 1 8 Q2 DNP C10 0.1UF 1 R1 3 3 R2 OPEN POK1 EN1 1 1 2 P20 4 P4 OPEN C8 1UF OPEN 1 2 L2 1 D9 BYP 9 OPEN C3 R19 OPEN R20 VCC 0 5 D2 VOUT1 0 R3 VCCIN R24 LDO PVCC 1 4 19 BOOT1 0 P29 OPEN R27 OPEN 6 DNP 0 EP 7 3 20 LGATE1 LDOREFIN 2 C11 4.7UF PHASE2 P19 4 21 PVCC LDO OPEN 1 P26 ISL6237 VIN Q1 22 NC VIN 8 1 23 GND NC 33 24 PGND U1 EN_LDO R12 R7 R31 C19 P2 8 VCC 200K LDO OPEN C7 1UF 7 LGATE2 1 1 Application Note 1302 6 0 TON R16 5 1 R15 32 31 30 29 28 27 26 25 REFIN2 ILIM2 OUT2 SKIP# POK2 EN2 UGATE2 PHASE2 4 BOOT2 BYP OUT1 FB1 ILIM1 POK1 EN1 UGATE1 PHASE1 3 VIN R30 1 P1 2 D3 PVCC 1 DNP 10 VOUT1 11 12 13 14 15 16 TON VCC EN_LDO 1 IRF7807V VCC R13 REF R11 C4 P14 1 C9 OPEN VCC VREF3 REF 0.1UF C18 OPEN 0 3 R10 R9 OPEN 1 OPEN VREF3 150K VOUT2 SKIP# POK2 EN2 0 R21 LDO OPEN Application Note 1302 Components List REF DES PART NUMBER QTY MANUFACTURER DESCRIPTION C1, C7, C8 08053D105KAT2A 3 AVX 1µF, 25V, X7R, 0805 C11 H1065-00475-10V10 1 GENERIC 4.7µF, 10V X5R 1206 C14, C16 TMK432BJ106KM 2 TAIYO-YUDEN 10µF, 25V X5R 1210 C4, C6, C10, C23, C24, C26 H1046-00104-50V10 6 GENERIC 0.1µF, 50V, X7R, 0805 C27, C28 OPEN 0 C29, C30 6TPD330M 2 C2, C3, C5, C9, C12, C13, C15, C17, C18, C19 OPEN C31, C32 OPEN 0 POSCAP Cap, SMD, Size D, DNP D1, D4, D5, D6 OPEN 0 DIODES-INC DNP D2, D3 OPEN 0 ON-SEMI DNP D7, D8 OPEN 0 DIODES DNP, 0.2A, 30V, Schottky SOT23 D9 Open 0 ON-SEMI 2A, 30V, Schottky SOT23 L1. L2 SD1003 2 FALCO 4.7µH, 20% 8.3A, 12.5mmx12.5mm Shielded P1, P2, P5 to P8 1514-2 6 KEYSTONE Test Point Turret 0.150 Pad 0.100 Thole P19 to P23 131-4353-00 5 TEKTRONIX Scope Probe Test Point PCB Mount P3, P11, P12, P14 to P18, P24, P26, P27, P28, P29 5000 KEYSTONE Miniature Red Test Point 0.100 Pad 0.040 Thole P4, P30 5001 2 KEYSTONE Miniature Black Test Point 0.100 Pad 0.040 Thole Q1 IRF7821 1 IR 30V 13.6A HEXFET Power MOSFET Q2 IRF7832 1 IR 30V 20A HEXFET Power MOSFET Q3 IRF7807V 1 IR 30V 8.3A N-Channel Power MOSFET Q4 IRF7811AV 1 IR 30V 10.8A N-Channel Power MOSFET R1, R8 H2512-00010-1/8W 2 GENERIC 1Ω, 1%, 0805 R15 H2512-01503-1/10W1 1 GENERIC 150kΩ, 1%, 0805 R2, R6, R7, R9, R11, R13, R14, R19, R20, R22, R23, R27, R32, R33, R34 OPEN R25, R26 OPEN R3, R10, R12, R17, R21, R24, R30, R31 H2512-00R00-1/10W R4, R5, R16, H2512-02003-1/10W1 SW1 to SW5 U1 Cap, SMD, 1206, Do Not Populate(DNP) POSCAP SANYO Cap, SMD, 0805, Do Not Populate(DNP) 0 13 330µF, 6.3V, POS CAP 9mΩ, D size Res, SMD, 0805, DNP 0 0 CAP, SMD, 1206, DNP GENERIC 0Ω, 1%, 0805 3 GENERIC 200kΩ, 1%, 0805 78B03S 5 GRAYHILL Dip Switch SPST (Raised Slide) ISL6237IRZA 1 INTERSIL High-Efficiency, Quad Output Controller 4 8 AN1302.1 September 23, 2008 Application Note 1302 Layout FIGURE 2. TOP COMPONENTS FIGURE 3. TOP ETCH FIGURE 4. 2nd LAYER FIGURE 5. 3rd LAYER 5 AN1302.1 September 23, 2008 Application Note 1302 Layout (Continued) FIGURE 6. BOTTOM COMPONENTS (MIRRORED) FIGURE 7. BOTTOM ETCH (MIRRORED) 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 6 AN1302.1 September 23, 2008