AOZ1010-EVA EZBuck™ 2A Simple Regulator Evaluation Board Note General Description Features The AOZ1010 evaluation board is a fully assembled and tested circuit board built with the AOZ1010 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 4.5V to 16V. The output voltage is preset and can be adjusted from 0.8V to VIN–0.4V ● ● ● ● ● The AOZ1010-EVA circuit has current limit, short circuit protection, input under voltage lock out, internal soft start, and thermal shut down features. It operates at a fixed 500kHz switching frequency. The current mode control and integrated internal MOSFET minimize component count, board area, and total cost. The AOZ1010 comes in an SO-8 package and is rated over a -40°C to +85°C ambient temperature range. ● ● ● 4.5V to 16V operating input voltage range Output voltage is preset to 3.3V and is adjustable down to 0.8V 2A continuous output current Fixed 500kHz PWM operation Internal soft start Cycle-by-cycle current limit Short-circuit protection Thermal shutdown Applications ● ● ● ● ● ● ● 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 C5 VIN L1 3.3µH EN C6 COMP AOZ1010 RC CC Rev. 1.0 December 2006 VOUT LX C4 R1 C2, C3 22µF Ceramic FB AGND PGND www.aosmd.com R2 Page 1 of 5 AOZ1010-EVA Component List Ref Designation Value Description Manufacture Part Number C1 22µF Ceramic Cap, 22µF, 25V, 1210, X5R GRM32ER61E226KE15L C2 22µF Ceramic Cap, 22µF, 25V, 1210, X5R GRM32ER61E226KE15L C3 22µF Ceramic Cap, 22µF, 25V, 1210, X5R GRM32ER61E226KE15L C4 NU C5 1µF Ceramic Cap, 1µF, 25V, 0603, X5R GRM188R61E105KA12D Manufacturer Murata C6 1000pF Ceramic Cap, 1000pF, 50V, 0603, X7R GRM188R71E102K CC* 1000pF Ceramic Cap, 1000pF, 50V, 0603, X7R GRM188R71E102K RC* 31.6kΩ Thick Film Res, 1%, 31.6kΩ, 0603 CRCW060331K6FKTAP R1* 31.6kΩ Thick Film Res, 1%, 31.6kΩ, 0603 CRCW060331K6FKTAP R2 10kΩ Thick Film Res, 1%, 10kΩ, 0603 CRCW060310K0FKTAP L1* 3.3µH Inductor, 3.3uH, 2.9A LQH55DN3R3M03 Murata U1 AOZ1010AI Buck regulator IC, 2A, 16V AOZ1010AI AOS DALE *For evaluation board with different output voltage, these values might be different. Ordering Information Output Preset Voltage IC Package Ambient Temperature Range AOZ1010-EVA-8.0V 8V SO-8 -40°C to +85°C AOZ1010-EVA-5.0V 5.0V SO-8 -40°C to +85°C AOZ1010-EVA-3.3V 3.3V SO-8 -40°C to +85°C AOZ1010-EVA-2.5V 2.5V SO-8 -40°C to +85°C AOZ1010-EVA-1.8V 1.8V SO-8 -40°C to +85°C Part Number Rev. 1.0 December 2006 www.aosmd.com Page 2 of 5 AOZ1010-EVA PCB Layout Figure 1. Top Silk Screen Figure 2. Top Layer Figure 3. Bottom Layer Rev. 1.0 December 2006 www.aosmd.com Page 3 of 5 AOZ1010-EVA BOM of 8V/2A AOZ1010 Regulator Ref Designation Value C1 22µF Ceramic Cap, 25V, X7R/X7R 1210 C2 22µF Ceramic Cap, 25V, X7R/X5R 1210 C3 22µF Ceramic Cap, 25V, X7R/X5R 1210 C4 NU C5 1µF Description Package Manufacturer Murata, AVX 0603 Ceramic Cap, 25V, X7R/X5R 0603 C6 1000pF Ceramic Cap, 50V, X7R 0603 CC 820pF Ceramic Cap, 50V, X7R 0603 RC 80.6kΩ Thick Film Res, 1% 0603 R1 90.9kΩ Thick Film Res, 1% 0603 R2 10kΩ Thick Film Res, 1% 0603 L1 10µH Inductor LQH55 series U1 AOZ1010A Buck regulator IC DALE Murata SO-8 AOS BOM of 5V/2A AOZ1010 Regulator Ref Designation Value Description Package C1 22µF Ceramic Cap, 25V, X7R/X5R 1210 C2 22µF Ceramic Cap, 25V, X7R/X5R 1210 C3 22µF Ceramic Cap, 25V, X7R/X5R 1210 C4 NU Murata, AVX 0603 C5 1µF Ceramic Cap, 25V, X7R/X5R 0603 C6 1000pF Ceramic Cap, 50V, X7R 0603 CC 1000pF Ceramic Cap, 50V, X7R 0603 RC 49.9kΩ Thick Film Res, 1% 0603 R1 52.3kΩ Thick Film Res, 1% 0603 R2 10kΩ Thick Film Res, 1% 0603 L1 4.7µH Inductor LQH55 series U1 AOZ1010A Rev. 1.0 December 2006 Manufacturer Buck regulator IC www.aosmd.com DALE Murata SO-8 AOS Page 4 of 5 AOZ1010-EVA BOM of 3.3V/2A AOZ1010 Regulator Ref Designation Value C1 22µF Ceramic Cap, 25V, X7R/X5R 1210 C2 22µF Ceramic Cap, 25V, X7R/X5R 1210 C3 22µF Ceramic Cap, 25V, X7R/X5R 1210 C4 NU C5 1µF Description Package Manufacturer Murata, AVX 0603 Ceramic Cap, 25V, X7R/X5R 0603 C6 1000pF Ceramic Cap, 50V, X7R 0603 CC 1000pF Ceramic Cap, 50V, X7R 0603 RC 31.6kΩ Thick Film Res, 1% 0603 R1 31.6kΩ Thick Film Res, 1% 0603 R2 10kΩ Thick Film Res, 1% 0603 L1 3.3µH Inductor LQH55 series U1 AOZ1010A Buck regulator IC DALE Murata SO-8 AOS BOM of 1.8V/2A AOZ1010 Regulator Ref Designation Value Description Package C1 22µF Ceramic Cap, 25V, X7R/X5R 1210 C2 22µF Ceramic Cap, 25V, X7R/X5R 1210 C3 22µF Ceramic Cap, 25V, X7R/X5R 1210 C4 NU Manufacturer Murata, AVX 0603 C5 1µF Ceramic Cap, 25V, X7R/X5R 0603 C6 1000pF Ceramic Cap, 50V, X7R 0603 CC 1500pF Ceramic Cap, 50V, X7R 0603 RC 20kΩ Thick Film Res, 1% 0603 R1 12.4kΩ Thick Film Res, 1% 0603 R2 10kΩ Thick Film Res, 1% 0603 L1 2.2µH Inductor LQH55 series U1 AOZ1010A Buck regulator IC DALE Murata SO-8 AOS 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 C2. Rev. 1.0 December 2006 www.aosmd.com Page 5 of 5