AOZ1018-EVA EZBuck™ 2A Simple Buck Regulator Evaluation Board Note General Description Features The AOZ1018 evaluation board is a fully assembled and tested circuit board built with the AOZ1018 buck regulator IC. It outputs a preset or adjustable voltage at up to 2A of continuous current. The evaluation board requires an input voltage from 4.5 V to 16 V. The output voltage is preset and can be adjusted from 0.8 V to VIN–0.4V ● ● ● ● ● The AOZ1018-EVA circuit has features like current limit, short circuit protection, input under voltage lock out, internal soft start and thermal shut down. It operates at a fixed 500 kHz switching frequency. The current mode control and integrated internal MOSFET minimize component count, board area and total cost. ● ● ● 4.5V to 16V operating input voltage range Output voltage was preset to 3.3 V, adjustable to as low as 0.8V 2A continuous output current Fixed 500kHz PWM operation Internal soft start Cycle-by-cycle current limit Short-circuit protection Thermal shutdown Applications ● The AOZ1018 comes in SO-8 package and is rated over a -40°C to +85°C ambient temperature range. ● ● ● ● ● ● Point of load DC/DC conversion PCIe graphics cards Set top boxes DVD drives and HDD LCD panels Cable modems Telecom/networking/datacom equipment Evaluation Board Schematic VIN C1 22µF Ceramic C7 1µF VIN From µPC L1 3.3µH U1 EN AOZ1018 C2 C3 COMP R1 C5 Rev. 1.1 January 2007 VOUT LX R2 FB AGND PGND www.aosmd.com D1 +3.3V Output @2A C4, C6 22µF Ceramic R3 Page 1 of 6 AOZ1013-EVA Component List Ref Designation Value Description Manufacture Part Number Manufacture Murata C1 22µF Ceramic Cap, 22uF, 25V, 1210, X5R GRM32ER61E226KE15L C2 1000pF Ceramic Cap, 1000pF, 50V, 0603, X7R GRM188R71E102K C3 NU C4 22µF Ceramic Cap, 22uF, 25V, 1210, X5R GRM32ER61E226KE15L C5* 1000pF Ceramic Cap, 1000pF, 50V, 0603, X7R GRM188R71E102K C6 22µF Ceramic Cap, 22uF, 25V, 1210, X5R GRM32ER61E226KE15L C7 1µF Ceramic Cap, 1uF, 25V, 0603, X5R GRM188R61E105KA12D R1* 31.6kΩ Thick Film Res, 1%, 31.6k, 0603 CRCW060331K6FKTAP R2* 31.6kΩ Thick Film Res, 1%, 31.6k, 0603 CRCW060331K6FKTAP R3 10kΩ Thick Film Res, 1%, 10k, 0603 CRCW060310K0FKTAP L1* 3.3µH Inductor, 3.3uH, 2.9A LQH55DN3R3M03 Murata Schottky Barrier Diode, 2A, 30V, SMA B230A-FDICT-ND DIODES Buck regulator IC, 2A, 16V AOZ1018AI AOS D1 U1 AOZ1018AI DALE *For evaluation board with different output voltage, these values might be different. Ordering Information Part Number Output Preset Voltage IC package Ambient Temperature Range AOZ1018-EVA-8.0V 8V SO-8 -40°C to +85°C AOZ1018-EVA-5.0V 5.0 V SO-8 -40°C to +85°C AOZ1018-EVA-3.3V 3.3 V SO-8 -40°C to +85°C AOZ1018-EVA-2.5V 2.5 V SO-8 -40°C to +85°C AOZ1018-EVA-1.8V 1.8 V SO-8 -40°C to +85°C Rev. 1.1 January 2007 www.aosmd.com Page 2 of 6 AOZ1013-EVA PCB Layout (1" x 1.25") Figure 1. Top Silk Screen Figure 2. Top Layer Figure 3. Bottom Layer Rev. 1.1 January 2007 www.aosmd.com Page 3 of 6 AOZ1013-EVA BOM of 8V/2A AOZ1018 Regulator Ref Designation Value C1 22µF C2 1000pF C3 NU C4 22µF Ceramic Cap, 25V, X7R/X5R 1210 C5 820pF Ceramic Cap, 50V, X7R 0603 C6 22µF Ceramic Cap, 25V, X7R/X5R 1210 C7 1µF Ceramic Cap, 25V, X5R 0603 R1 80.6kΩ Thick Film Res, 1% 0603 R2 90.9kΩ Thick Film Res, 1% 0603 R3 10kΩ Thick Film Res, 1% 0603 L1 10µH Inductor LQH55 series D1 U1 Description Ceramic Cap, 25V, X7R/X7R Ceramic Cap, 50V, X7R 1210 Manufactures Murata, AVX 0603 0603 Schottky Barrier Diode, 2A, 30V, SMA AOZ1018A Package Buck regulator IC DALE Murata B230A-FDICT-ND SO-8 DIODES AOS BOM of 5V/2A AOZ1018 Regulator Ref Designation Value C1 22µF C2 1000pF C3 NU C4 22µF C5 1000pF C6 C7 Description Package Ceramic Cap, 25V, X7R/X5R 1210 Ceramic Cap, 50V, X7R 0603 1210 Ceramic Cap, 50V, X7R 0603 22µF Ceramic Cap, 25V, X7R/X5R 1210 1µF Ceramic Cap, 25V, X5R 0603 R1 49.9kΩ Thick Film Res, 1% 0603 R2 52.3kΩ Thick Film Res, 1% 0603 R3 10kΩ Thick Film Res, 1% 0603 L1 4.7µH Inductor LQH55 series U1 Rev. 1.1 January 2007 Schottky Barrier Diode, 2A, 30V, SMA AOZ1018A Murata, AVX 0603 Ceramic Cap, 25V, X7R/X5R D1 Manufactures Buck regulator IC www.aosmd.com DALE Murata B230A-FDICT-ND SO-8 DIODES AOS Page 4 of 6 AOZ1013-EVA BOM of 3.3V/2A AOZ1018 Regulator Ref Designation Value C1 22µF C2 1000pF C3 NU C4 22µF C5 1000pF C6 22µF Ceramic Cap, 25V, X7R/X5R 1210 C7 1µF Ceramic Cap, 25V, X5R 0603 R1 31.6kΩ Thick Film Res, 1% 0603 R2 31.6kΩ Thick Film Res, 1% 0603 R3 10kΩ Thick Film Res, 1% 0603 L1 3.3µH Inductor LQH55 series D1 U1 Description Ceramic Cap, 25V, X7R/X5R Ceramic Cap, 50V, X7R 1210 Manufactures Murata, AVX 0603 0603 Ceramic Cap, 25V, X7R/X5R 1210 Ceramic Cap, 50V, X7R 0603 Schottky Barrier Diode, 2A, 30V, SMA AOZ1018A Package Buck regulator IC DALE Murata B230A-FDICT-ND SO-8 DIODES AOS BOM of 1.8V/2A AOZ1018 Regulator Ref Designation Value C1 22µF C2 1000pF C3 NU C4 22µF C5 1500pF C6 C7 Description Package Ceramic Cap, 25V, X7R/X5R 1210 Ceramic Cap, 50V, X7R 0603 1210 Ceramic Cap, 50V, X7R 0603 22µF Ceramic Cap, 25V, X7R/X5R 1210 1µF Ceramic Cap, 25V, X5R 0603 R1 20kΩ Thick Film Res, 1% 0603 R2 12.4kΩ Thick Film Res, 1% 0603 R3 10kΩ Thick Film Res, 1% 0603 L1 2.2µH Inductor LQH55 series U1 Rev. 1.1 January 2007 Schottky Barrier Diode, 2A, 30V, SMA AOZ1018A Murata, AVX 0603 Ceramic Cap, 25V, X7R/X5R D1 Manufactures Buck regulator IC www.aosmd.com DALE Murata B230A-FDICT-ND SO-8 DIODES AOS Page 5 of 6 AOZ1013-EVA Quick Start Guide 1. 2. 3. 4. 5. Connect the terminals of load to +VOUT pins and GND pins. Set load current between 0A and 2A. Connect the DC power supply to +VIN pin and GND pins. Set DC power supply voltage between 4.5V and 16V. Connect EN pin to +VIN or any voltage source which is between 2.0V and 16V. Turn on DC power supply and evaluation circuit will start. Measure input voltage at the +VIN pin and GND pins to eliminate the effect of voltage drop on wire between DC power supply and the evaluation board. 6. Measure output voltage at the +VOUT pin and GND pins to eliminate the effect of voltage drop on wire between load and the evaluation board. 7. Use an oscilloscope to monitor input ripple voltage across input capacitor C1. 8. Use an oscilloscope to monitor output ripple voltage across output capacitor C4. Rev. 1.1 January 2007 www.aosmd.com Page 6 of 6