TM EV2303DN-00A 3A, 28V, 340KHz Synchronous Rectified Step-Down Converter The Future of Analog IC Technology TM EVALUATION BOARD DESCRIPTION FEATURES The EV2303DN-00A is an evaluation board for the MP2303, a monolithic synchronous buck regulator. • • • The MP2303 integrates 120mΩ MOSFETS that provide 3A continuous load current over a wide operating input voltage of 4.75V to 28V. APPLICATIONS Current mode control provides fast transient response and cycle-by-cycle current limiting. An adjustable soft-start prevents inrush current at turn-on. In shutdown mode, the supply current drops to 0.3µA. • • • 3A Output Current Wide 4.75V to 28V Operating Input Range 3.3V Output, Adjustable from 0.80V to 25V Distributed Power Systems Pre-Regulator for Linear Regulators Notebook Computers “MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic Power Systems, Inc. This device, available in an 8-pin SOIC package, provides a very compact system solution with minimal reliance on external components. ELECTRICAL SPECIFICATIONS Parameter Input Voltage Output Voltage Output Current Symbol Value Units VIN VOUT IOUT 4.75 – 28 3.3 3 V V A EV2303DN-00A EVALUATION BOARD Efficiency vs Load Current 100 VIN=8V 95 EFFICIENCY (%) 90 (L x W x H) 2.0” x 1.5” x 0.5” (5.0cm x 3.8 x 1.2cm) Board Number MPS IC Number EV2303DN-00A MP2303DN EV2303DN-00A Rev. 1.1 2/13/2006 85 VIN=12V 80 VIN=24V 75 70 65 60 VOUT=3.3V 55 50 0 1000 2000 3000 LOAD CURRENT (mA) www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2006 MPS. All Rights Reserved. EV2303_EC01 1 TM EV2303DN-00A – 3A, 28V, 340KHz SYNCHRONOUS RECTIFIED, STEP-DOWN CONVERTER EVALUATION BOARD EVALUATION BOARD SCHEMATIC EN C7 NS SS C1 10nF 1 2 VIN U1 BS SS IN EN R5 NS 8 7 MP2303 3 GND 4 SW GND COMP FB 6 C3 4.7nF 5 C4 NS C10 470pF VOUT SW D1 NS GND EV2303_S01 EV2303DN-00A BILL OF MATERIALS Qty Ref Value 1 2 1 2 2 1 1 1 1 1 1 1 1 1 1 C1 C2 C8 C3 C4 C7 C5 C9 C6 C10 D1 L1 R1 R2 R3 R4 R5 U1 10nF 10µF 4.7nF Description Ceramic Capacitor, 50V, X7R Ceramic Capacitor, 35V, X7R Ceramic Capacitor, 50V, X7R Open 22µF Ceramic Capacitor, 16V, X5R 0.1µF Ceramic Capacitor, 50V, X7R 470pF Ceramic Capacitor, 50V, X7R Open 10µH Inductor, 4.45A 30.9kΩ Resistor, 1% 4.42kΩ Resistor, 1% 10kΩ Resistor, 1% 100kΩ Resistor, 5% Open Synchronous Step-Down Converter EV2303DN-00A Rev. 1.1 2/13/2006 Package Manufacturer Part Number 0603 1210 0603 Any Holystone Any 1210 0805 0805 Taiyo Yuden Any Any EMK325BJ226MM SMD 0603 0603 0603 0603 Sumida Any Any Any Any CDRH105R-100NC SO8 MPS MP2303DN www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2006 MPS. All Rights Reserved. C1210X106M035T 2 TM EV2303DN-00A – 3A, 28V, 340KHz SYNCHRONOUS RECTIFIED, STEP-DOWN CONVERTER EVALUATION BOARD PRINTED CIRCUIT BOARD LAYOUT Figure 1—Top Silk Layer Figure 2—Top Layer Figure 3—Bottom Layer EV2303DN-00A Rev. 1.1 2/13/2006 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2006 MPS. All Rights Reserved. 3 TM EV2303DN-00A – 3A, 28V, 340KHz SYNCHRONOUS RECTIFIED, STEP-DOWN CONVERTER EVALUATION BOARD QUICK START GUIDE 1. Connect the positive and negative terminals of the load to the VOUT and GND pins, respectively. 2. Preset the power supply output to between 4.75V and 28V, then turn it off. 3. Connect the positive and negative terminals of the power supply output to the VIN and GND pins, respectively. 4. Turn the power supply on (the MP2303 will automatically startup). 5. To use the Enable function, apply a digital input to the EN pin. Drive EN higher than 2.5V to turn on the regulator or less than 0.7V to turn it off. 6. An under voltage lockout (UVLO) function can be implemented by the addition of a resistor divider (R4 and R5). The Enable threshold is 2.5V, so the VIN UVLO threshold is: ⎛ R4 ⎞ ⎜1 + ⎟ × 2. 5 V . ⎝ R5 ⎠ NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications. Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not assume any legal responsibility for any said applications. EV2303DN-00A Rev. 1.1 2/13/2006 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2006 MPS. All Rights Reserved. 4