GMK325BJ106KN-T

Application Note 1574 Author: Paul Orfanu ISL85033DUALEVAL1Z Wide VIN Dual Standard Buck Regulator With 3A/3A Output Current Description Quick Setup Guide 1. Ensure that the circuit is correctly connected to the supply and loads prior to applying any power. 2. Connect the bias supply to VIN1, the plus terminal to VIN1 and the negative return to GND2. 3. Verify that the position is ON for S1 and S2. 4. Turn on the power supply. 5. Verify the output voltage is 5V for VOUT1 and 3.3V for VOUT2. The ISL85033DUALEVAL1Z kit is intended for use by individuals with requirements for Point-of-Load applications sourcing from 4.5V to 28V. The ISL85033DUALEVAL1Z evaluation board is used to demonstrate the performance of the ISL85033 wide VIN dual standard buck regulator with 3A/3A output current converter. The ISL85033 is offered in a 4mmx4mm 28 Ld TQFN package with 1mm maximum height. The complete converter occupies 6.25cm2 area. Evaluating the Other Output Voltage The ISL85033DUALEVAL1Z kit outputs are preset to 5V for VOUT1 and 3.3V for VOUT2; however, output voltages can be adjusted from 0.8V to 5V. The output voltage programming resistor, R3 (or R14 in Channel 2), will depend on the desired output voltage of the regulator and the value for the feedback resistor R2 (R16 respectively), as shown in Equation 1. R3 = ( V OUT1 – V FB ) • R2 ⁄ V FB (EQ. 1) R14 = ( V OUT2 – V FB ) • R16 ⁄ V FB Key Features • Wide Input Voltage Range from 4.5V to 28V • Adjustable Output Voltage with Continuous Output Current up to 3A • Current Mode Control • Adjustable Switching Frequency from 300kHz to 2MHz • Independent Power-Good Detection • Selectable In-Phase or Out-of-Phase PWMs Switching Operation • Independent, Sequential, Ratiometric or Absolute Tracking Between Outputs • Internal 2ms Soft-start Time • Overcurrent and Hiccup Mode Short Circuit Protection, Thermal Overload Protection, UVLO • Boot Undervoltage Detection • Channels are Out-of-phase, Reducing Voltage Ripple and Component Size If the output voltage desired is 0.8V, then R3 (R14 respectively) is shorted. The value for R2 (R16 respectively) is typically between 1k and 10k. Please note that if VOUT is less than 2.5V, the switching frequency and compensation must be changed for 300kHz operation due to minimum on-time limitation. Please refer to the data sheet for further information (FN6676). Recommended Equipment The following materials are recommended to perform testing: • 0V to 30V Power Supply with at least 7A source current capability or 5V battery • Electronic Loads capable of sinking current up to 7A • Digital Multimeters (DMMs) • 100MHz quad-trace oscilloscope • Signal generator Frequency Control ISL85033 has an FS pin that controls the frequency of operation. Programmable frequency allows for optimization between efficiency and external component size. Default switching frequency is 500kHz when FS is tied to VCC (R9 = 0). By removing R9 and connecting R10 to ground, the switching frequency could be changed from 300kHz (R10 = 383k) to 2MHz (R10 = 40.2k). Please refer to the data sheet (FN6676) for calculating the value of R10. Do not leave this pin floating. November 29, 2010 AN1574.2 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. Copyright Intersil Americas Inc. 2010. All Rights Reserved. 1-888-INTERSIL or 1-888-468-3774 | 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. 1 Application Note 1574 Disabling/enabling Function The ISL85033 evaluation board contains S1, S2 switches to enable or disable each of the channels, thus allowing low quiescent current state. Table 1 details this function. TABLE 1. SWITCH SETTINGS S1 ON OFF ON OFF S2 OFF ON ON OFF ON/OFF CONTROL Enable VOUT1; Disable VOUT2 Disable VOUT1; Enable VOUT2 Enable VOUT1; Enable VOUT2 Disable VOUT1; Disable VOUT2 High Floating High Floating EN1 High Floating EN2 Floating High TABLE 2. VOUT1 First After VOUT2 > 90% Same time as VOUT2 VOUT2 After VOUT1 > 90% First Same time as VOUT1 Not Allowed NOTE SYNC Control The ISL85033 evaluation board has an SI pin that allows external synchronization frequency to be applied. Default board configuration has R18 = 0 to GND, which defaults to the internal selected switching frequency. Removing R18 allows the synchronization to be external between 600kHz to 4MHz. Do not leave this pin floating. If EN1 or EN2 are floating, then the outputs will start in the sequencing described in the data sheet section on output sequencing and also summarized in Table 2. 2 AN1574.2 November 29, 2010 ISL85033DUALEVAL1Z Schematic PG1 FS GND SI SO PG2 VCC R12 DNP R13 SYNCIN A PGOOD2 PGOOD1 FS 28 27 26 25 24 23 22 VOUT1 VOUT2 DNP A COMP2 COMP1 PGOOD1 FS NC SGND SYNCIN SYNCOUT PGOOD2 JVO1 C1 68PF A R1 0 R3 42.2K C13 C4 12PF R5 C15 12PF R11 R14 25.5K JVO2 C16 68PF R15 0 A R16 8.06K GND4 JLX2 VOUT1 VIN1 R21 DNP R22 0 A VOUT2 VIN2 A FB1 SS1 470PF 69.8K 2 1 COMP1 FB1 SS1 PGND1 BOOT1 COMP2 FB2 SS2 PGND2 BOOT2 21 20 69.8K 19 18 17 16 A SS2 C11 OPEN A JLX1 VO1 A A L1 D1 29 VIN1 VIN1 EN1 VCC EN2 VIN2 VIN2 EN1 VCC EN2 VOUT1 VOUT1=5V 8 9 10 11 12 13 14 GND2 VCC R19 DNP A R20 DNP C18 10UF C6 10UF A EN1 A C7 4.7UF 100K 100K 0 0 R4 R6 EN1 ON OPEN S1 OFF A EN2 S2 A ON OPEN OFF SS1 SS2 FS 0 A 0 3 GND1 VIN1 AN1574.2 November 29, 2010 C10 470PF SS1 C3 OPEN A C5 3 4 R2 8.06K A U1 ISL85033IRTZ SS2 BOOT2 C9 FB2 A A A BOOT1 5 6 Application Note 1574 0.01UF 7 PHASE1 PHASE1 EP A PHASE2 PHASE2 15 0.01UF A A L2 D2 7UH C17 47UF A A C2 7UH C14 47UF DNP B340B A B340B C12 VOUT2 VOUT2=3.3V VO2 FB1 R23 DNP R24 DNP FB2 DNP A A VIN1 C8 10UF A VIN2 BOOT1 D3 VIN2 COMP1 COMP2 BOOT2 D4 GND3 SS1 R25 DNP SS2 SGND A DNP EN2 PGOOD1 PGOOD2 VCC D5 DNP A BOOT1 DNP VCC R7 R8 R9 R17 DNP R26 DNP BOOT2 D6 DNP EXT_5V R27 DNP SYNCIN R18 R10 DNP VOUT1 VOUT2 A Application Note 1574 TABLE 3. BILL OF MATERIALS PART NUMBER ISL85033EVAL1ZREVBPCB QTY UNITS 1 ea REFERENCE DESIGNATOR SEE LABEL-RENAME BOARD DNP (C2, C12) DESCRIPTION PWB-PCB, ISL85033EVAL1Z, REVB, ROHS CAP, SMD, 8X10.2, 100µF, 35V, 20%, AL.EL., ROHS CAP, SMD, 1210, 10µF, 35V, 10%, X5R, ROHS CAP, SMD, 0402, 12pF, 50V, 5%, NPO, ROHS CAP, SMD, 0402, 68pF, 50V, 5%, NPO, ROHS CAP, SMD, 0603, 0.01µF, 50V, 10%, X7R, ROHS CAP, SMD, 0603, 470pF, 50V, 5%, NPO, ROHS CAP, SMD, 0603, 4.7µF, 6.3V, 10%, X5R, ROHS MANUFACTURER TBD MANUFACTURER PART # ISL85033EVAL1ZREVBPCB EEE-FK1V101P-T 0 ea PANASONIC EEE-FK1V101P GMK325BJ106KN-T 2 ea C6, C8 TAIYO YUDEN GMK325BJ106KN-T H1044-00120-50V5-T 2 ea C13, C15 AVX VENKEL MURATA PANASONIC VENKEL 04025C120JAT C0402C0G500-120JNE GRM36COG680J050AQ ECJ-0EC1H680J C0402COG500-680JNE GRM39X7R103K050 06035C103KAT2A C0603X74500-103KNE ECJ-1VC1H471J C0603COG500-471JNE C0603X5R6R3-475KNE C1608X5R0J475K ECJ-1VB0J475K GRM188R60J475KE19D C0603C475K9PACTU JMK107BJ475KA-T H1044-00680-50V5-T 2 ea C1, C16 H1045-00103-50V10-T 2 ea C5, C9 MURATA AVX VENKEL H1045-00471-50V5-T 2 ea C4, C10 PANASONIC VENKEL VENKEL TDK PANASONIC MURATA KEMET TAIYO YUDEN H1045-00475-6R3V10-T 1 ea C7 H1045-DNP 0 ea C3, C11 CAP, SMD, 0603, DNP-PLACE HOLDER, ROHS CAP, SMD, 1210, 10µF, 50V, 10%, X5R, ROHS CAP, SMD, 1210, 47µF, 16V, 20%, X5R, ROHS TAIYO YUDEN UMK325BJ106KM-T H1082-00106-50V10-T 1 ea C18 H1082-00476-16V20-T 2 ea C14, C17 TDK PANASONIC MURATA TAIYO YUDEN KEMET VENKEL C3225X5R1C476M ECJ-4YB1C476M GRM32ER61C476ME15L EMK325BJ476MM-T C1210C476M4PACTU C1210X5R160-476MNE SQL004 SQL004 2 ea L1, L2 COIL-PWR INDUCTOR, SMD, 10mm, 7µH, 25%, 4.8A, ROHS FALCO 131-4353-00 4 ea JLX1, JLX2, JVO1, JVO2 CONN-SCOPE PROBE TEST PT, COMPACT, PCB MNT, ROHS TEKTRONIX 131-4353-00 4 AN1574.2 November 29, 2010 Application Note 1574 TABLE 3. BILL OF MATERIALS (Continued) PART NUMBER 1514-2 QTY UNITS 8 ea REFERENCE DESIGNATOR VO1, VO2, GND1GND4, VIN1, VIN2 DESCRIPTION CONN-TURRET, TERMINAL POST, TH, ROHS MANUFACTURER KEYSTONE MANUFACTURER PART # 1514-2 5002 11 ea a) FS, SI, SO, EN1, EN2, CONN-MINI TEST GND, PG1, PG2 POINT, VERTICAL, WHITE, ROHS b) SS1, SS2, EXT_5V CONN-MINI TEST POINT, VERTICAL, WHITE, ROHS KEYSTONE 5002 5002 0 ea KEYSTONE 5002 B340B-13-F-T 2 ea D1, D2 DIODE-SCHOTTKY, DIODES INC. SMD, SMB, 2P, 40V, 3A, ROHS IC-3A DUAL STD REGULATOR, 28P, TQFN, 4x4, ROHS RESISTOR, SMD, 0603, 0.1%, MF, DNP-PLACE HOLDER VENKEL RES, SMD, 0402, 0Ω, 1/16W, 5%, TF, PANASONIC ROHS RES,SMD, 0402, 25.5k, 1/16W, 1%, TF, ROHS VENKEL PANASONIC VISHAY/DALE STACKPOLE INTERSIL B340B-13-F ISL85033IRTZ 1 ea U1 ISL85033IRTZ H2505-DNP 0 ea R10, R17, R19, R20, R23-R27 H2510-00R00-1/16W-T 2 ea R1, R15 CR0402-16W-00T ERJ-2GE0JR00 CR0402-16W-2552FT ERJ-2RKF2552X CRCW040225K5FKED RMC 1/16S 25.5K 1% R ERJ-2RKF4222X CR0402-16W-4222FT CR0402-16W-8061FT ERJ-2RKF8061X MCR01MZPF8061 RC0402FR-078K06L CRCW04028K06FKED CR0603-10W-000T MCR03EZPJ000 ERJ-3GEY0R00V RC0603JR-070RL CRCW06030000Z0EA ERJ-3EKF1004V CR0603-10W-1004FT RC0603FR-071ML MCR03EZPFX1004 RK73H1JTTD1004F CRCW06031M00FKEA H2510-02552-1/16W1-T 1 ea R14 H2510-04222-1/16W1-T 1 ea R3 RES,SMD, 0402, 42.2k, 1/16W, 1%, TF, ROHS RES, SMD, 0402, 8.06k, 1/16W, 1%, TF, ROHS PANASONIC VENKEL VENKEL PANASONIC ROHM YAGEO VISHAY/DALE H2510-08061-1/16W1-T 2 ea R2, R16 H2511-00R00-1/10W-T 4 ea R7-R9, R18 RES, SMD, 0603, 0Ω, 1/10W, TF, ROHS VENKEL ROHM PANASONIC YAGEO VISHAY/DALE H2511-01004-1/10W1-T 2 ea R4, R6 PANASONIC RES, SMD, 0603, 1M, 1/10W, 1%, TF, VENKEL ROHS YAGEO ROHM KOA VISHAY/DALE 5 AN1574.2 November 29, 2010 Application Note 1574 TABLE 3. BILL OF MATERIALS (Continued) PART NUMBER H2511-06982-1/10W1-T QTY UNITS 2 ea REFERENCE DESIGNATOR R5, R11 DESCRIPTION RES, SMD, 0603, 69.8k, 1/10W, 1%, TF, ROHS MANUFACTURER VENKEL YAGEO VISHAY/DALE KOA H2511-DNP 0 ea R12, R13 RES, SMD, 0603, DNP-PLACE HOLDER, ROHS RES, SMD, 1210, VENKEL 0Ω, 1/4W, TF, ROHS RES, SMD, 1210, DNP, DNP, DNP, TF, ROHS SWITCH-TOGGLE, THRU-HOLE, 5PIN, SPDT, 3POS, ONOFF-ON, ROHS BUMPONS, 0.44’ W x 0.20’ H, DOMETOP, BLACK BAG, STATIC, 5X8, ZIPLOC, ROHS DO NOT POPULATE OR PURCHASE LABEL, TO RENAME INTERSIL BOARD LABEL, FOR SERIAL NUMBER AND BOM REV # LABEL-RENAME BOARD C&K COMPONENTS GT13MCBE CR1210-4W-000 MANUFACTURER PART # CR0603-10W-6982FT RC0603FR-0769K8L CRCW060369K8FKEA RK73H1JTTD6982F H2514-00R00-1/4W-T H2514-DNP 1 0 ea ea R22 R21 GT13MCBE 2 ea S1, S2 SJ-5003-BLACK 4 ea Bottom four corners 3M SJ-5003SPBL 5X8-STATIC-BAG DNP LABEL-RENAME BOARD LABEL-SERIAL NUMBER 1 0 1 1 ea ea ea ea Place assy in bag D3-D6 RENAME PCB TO: ISL85033DUALEVAL1Z INTERSIL 212403-013 6 AN1574.2 November 29, 2010 Application Note 1574 ISL85033DUALEVAL1Z Board Layout FIGURE 1. TOP LAYER COMPONENTS FIGURE 2. TOP LAYER ETCH 7 AN1574.2 November 29, 2010 Application Note 1574 ISL85033DUALEVAL1Z Board Layout (Continued) FIGURE 3. SECOND LAYER ETCH FIGURE 4. THIRD LAYER ETCH 8 AN1574.2 November 29, 2010 Application Note 1574 ISL85033DUALEVAL1Z Board Layout (Continued) FIGURE 5. BOTTOM LAYER ETCH FIGURE 6. BOTTOM LAYER COMPONENTS 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 9 AN1574.2 November 29, 2010