ISL8009AEVAL1Z: 1.5A Synchronous Buck Regulator with Integrated MOSFETs

Transcription

1 ISL8009EVLZ:.5 Synchronous Buck Regulator with Integrated MOSFETs pplication Note October 9, 008 N88. Description The ISL8009EVLZ kit is intended for use by individuals with requirements for Point-of-Load applications sourcing from.7v to 5.5V. The ISL8009EVLZ evaluation board demonstrates the performance of the ISL8009 low quiescent current mode converter. The ISL8009 is offered in a mmxmm 8 Ld DFN package with mm maximum height. The complete converter occupies less than cm area. Key Features High Efficiency Synchronous Buck Regulator With up to 95% Efficiency ms Reset Timer Soft Discharge Output Cap During Disable.7V to 5.5V Supply Voltage % Output ccuracy Over-Temperature/Load/Line.5 Guaranteed Output Current 7µ Quiescent Supply Current in PFM Mode Selectable Forced PWM Mode and PFM Mode Less Than µ Logic Controlled Shutdown Current 90% Maximum Duty Cycle for Lowest Dropout Internal Current Mode Compensation Internal Digital Soft-Start Peak Current Limiting, Short Circuit Protection Over-Temperature Protection Enable Small 8 Ld mmxmm DFN Pb-Free (RoHS Compliant) Recommended Equipment The following materials are recommended to perform testing: Quick Setup Guide. Ensure that the circuit is correctly connected to the supply and loads prior to applying any power.. Connect the bias supply to. Plus terminal to P4() and negative return to P5(GND).. Verify that position is ON for SW. 4. Turn on the power supply. 5. Verify the output voltage is.8v for V OUT Evaluating the Other Output Voltage The ISL8009EVLIZ kit output is preset to.8v; however, output voltages can be adjusted from 0.8V to.v by following Equations and : V OUT 0.8 R = R Let s set R = 4kΩ: ( R ) R = V OUT 0.8 If desired output is 0.8V then short R and open R. Mode Control The ISL8009 has a SKIP pin that controls the operation mode. When the SKIP pin is driven to low or shorted to ground, the regulator operates in a forced PWM mode. The forced PWM mode remains the fixed PWM frequency at light load instead of entering the skip mode. TBLE. SWITCH SETTINGS SW SKIP FUNCTION PWM Fixed PWM frequency at light load PFM Force continuous mode SW ENBLE ON/OFF CONTROL OFF Disable V OUT ON Enable V OUT (EQ. ) (EQ. ) 0V to 0V power supply with at least 5 source current capability, battery, notebook C adapter Two electronic loads capable of sinking current up to 5 Digital Multimeters (DMMs) 00MHz quad-trace oscilloscope Signal generator CUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures INTERSIL or Intersil (and design) is a registered trademark of Intersil mericas Inc. Copyright Intersil mericas Inc ll Rights Reserved ll other trademarks mentioned are the property of their respective owners.

2 pplication Note 88 Schematic J P4 C 0µF C 0µF EN POR SKIP 4 EN POR SKIP ISL8009IRZ-T 9 E U RSI VFB GND LX RSI L.µH R 4k C4 0pF C5 0µF J C6 0µF P7 P8 P5 R 00k P RSI R 00k P PG R4 00k DD R5 k N700 Q P SKIP R6 00k R9 OPEN SW PFM PWM P6 EN R7 00k R8 OPEN SW ON/EX OFF N88. October 9, 008

3 pplication Note 88 TBLE. COMPONENT LIST REF DES QTY VLUE TOL. VOLTGE PCKGE PRT NUMBER MNUFCTURER DESCRIPTION C, C, C5, C6 4 0µF 0% 0V 06 GRMCR706K0L-T MURT CP, SMD, 06, 0µF, 0V, 0%, X7R, ROHS, MONOLITHIC C4 0pF 5% 50V 060 H V5-T VENKEL CP, SMD, 060, 0pF, 50V, 5%, C0G, ROHS L.µH 0% 7.6x6 DR7-R-R COOPER ELECTRONIC TECH. COIL-PWR INDUCTOR, SMD, 7.6x6,.µH, 0%, 4.5, ROHS D mmx.5mm LTST-C70CKT LITEON/VISHY LED-Gas RED, SMD, mmx.5mm, 00mW, 40m, 0mcd, ROHS U x ISL8009IRZ INTERSIL IC-.5 SYNC BUCK REGULTOR, 8P, DFN, x, ROHS Q - 60V N-CHNNEL N700-7-F-T DIODES, INC. TRNSISTOR, N-CHNNEL, LD SOT-, 60V, 5m, ROHS R-R4, R6, R7 5 00k % 00V 060 H5-000-/0W-T RES, SMD, 060, 00k, /0W, %, TF, ROHS R 4k % 00V 060 H5-04-/0W-T YGEO RES, SMD, 060, 4k,/0W,%, TF, ROHS R5 k % 00V 060 H5-000-/0W-T KO RES, SMD, 060, k, /0W, %, TF, ROHS R8, R9 0 00V 060 H5-DNP RES, SMD, 060, DNP-PLCE HOLDER, ROHS SW, SW GTMSCBE-T C&K COMPONENTS SWITCH-TOGGLE, SMD, ULTRMINI, P, SPST MINI N88. October 9, 008

4 pplication Note 88 ISL8009EVLZ Board Layout FIGURE. TOP COMPONENTS FIGURE. TOP LYER ETCH 4 N88. October 9, 008

5 pplication Note 88 ISL8009EVLZ Board Layout (Continued) FIGURE. BOTTOM LYER COMPONENTS (MIRRORED) FIGURE 4. BOTTOM LYER ETCH (MIRRORED) Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. ccordingly, the reader is cautioned to verify that the pplication Note or Technical Brief is current before proceeding. For information regarding Intersil Corporation and its products, see 5 N88. October 9, 008

6 Mouser Electronics uthorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Intersil: ISL8009EVLZ