TM EV2309DS-00A 1A, 23V, 340KHz Synchronous Step-Down Converter Evaluation Board The Future of Analog IC Technology TM GENERAL DESCRIPTION FEATURES The EV2309DS-00A is an evaluation board for the MP2309, a monolithic synchronous buck regulator. The device integrates 140mΩ MOSFETS that provide 1A continuous load current over a wide operating input voltage of 4.75V to 23V. Current mode control provides fast transient response and cycle-by-cycle current limit. • • • An adjustable soft-start prevents inrush current at turn-on. In shutdown mode, the supply current is only 1µA. • • • • Up to 1A Output Current Wide 4.75V to 23V Operating Input Range Monolithic Synchronous Buck with 140mΩ High-Side and Low-Side FETs Fixed 340KHz Frequency All Ceramic Input and Output Capacitors Programmable Soft-Start Programmable Input Under Voltage Lockout APPLICATIONS This device, available in an 8-pin SOIC package, provides a very compact system solution with minimal reliance on external components. • • • • • ELECTRICAL SPECIFICATIONS “MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic Power Systems, Inc. Parameter Supply Voltage Output Voltage Output Current Symbol Value Units VIN VOUT IOUT 4.75 to 23 3.3 0 to 1 V V A Distributed Power Systems Networking Systems FPGA, DSP, ASIC Power Systems Green Electronics/ Appliances Notebook Computers EV2309DS-00A EVALUATION BOARD Efficiency vs Load Current 100 EFFICIENCY (%) 90 80 VIN = 5V 70 VIN = 12V 60 VIN = 23V 50 40 30 20 (L x W x H) 2.0” x 1.5” x 0.5” (5.0cm x 3.8cm x 1.2cm) 0 0.25 0.5 0.75 LOAD CURRENT (A) 1.0 MP2309-EC01 Board Number MPS IC Number EV2309DS-00A MP2309 EV2309DS-00A Rev. 1.3 9/29/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. 1 TM EV2309DS-00A – 1A, 23V, 340KHz SYNCHRONOUS STEP-DOWN EV BOARD EVALUATION BOARD SCHEMATIC C1 10nF VIN C8 NS GND 2 7 EN C7 NS R5 NS 1 BS 3 SW EN SS GND FB COMP 4 (optional) 5 C5 NS GND 6 C4 NS VOUT 3.3V / 1A D1 B130LAW MP2309 8 SS U1 IN C3 3.3nF EV2309_S01 EV2309DS-00A BILL OF MATERIALS Qty Ref Value Description 1 C1 10nF 1 C2 10µF 1 C3 3.3nF 4 C4, C5, C7, C8 NS 1 C6 0.1µF 1 C9 22µF 1 D1 1 L1 1 R1 26.1kΩ Resistor, 1% 1 R2 7.5kΩ Resistor, 5% 1 R3 10kΩ Resistor, 1% 1 R4 100kΩ Resistor, 5% 1 R5 NS 1 U1 Ceramic Capacitor, 50V, X7R Ceramic Capacitor, 25V, X7R Ceramic Capacitor, 50V, X7R 0805 1210 0805 Manufacturer: Manufacturer P/N Distributor: Distributor P/N Panasonic: ECJ-2VB1H223K TDK: C3225X7R1E106M Panasonic: ECJ-2VB1H332K Digikey: PCC223BGCT-ND Digikey: 445-1434-1-ND Digikey: PCC332BNCT-ND Not Stuffed Ceramic Capacitor, 50V, X7R Ceramic Capacitor, 16V, X5R Diode Schottky, 30V, 1A 10µH EV2309DS-00A Rev. 1.3 9/29/2005 Package Inductor, 1.5A TDK: C2012X7R1H104K TDK: 1210 C3225X5R1C226M Diodes Inc.: SOD-123 B130LAW Sumida: SMD CDRH6D26NP-100NB Panasonic: 0805 ERJ-6ENF2612V Panasonic: 0805 ERJ-6GEYJ752V Panasonic: 0805 ERJ-6ENF1002V Panasonic: 0805 ERJ-6GEYJ104V 0805 Digikey: 445-1349-1-ND Digikey: 445-1436-1-ND Digikey: B130LAWDICT-ND Digikey: P26.1KCCT-ND Digikey: P7.5KACT-ND Digikey: P10.0KCCT-ND Digikey: P100KACT-ND Not Stuffed Step-Down Converter, 1A, 340KHz SO8 MPS: MP2309DS www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. 2 TM EV2309DS-00A – 1A, 23V, 340KHz SYNCHRONOUS STEP-DOWN EV BOARD PRINTED CIRCUIT BOARD LAYOUT Figure 1—Top Silk Layer Figure 2—Top Layer Figure 3—Bottom Layer EV2309DS-00A Rev. 1.3 9/29/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. 3 TM EV2309DS-00A – 1A, 23V, 340KHz SYNCHRONOUS STEP-DOWN EV BOARD QUICK START GUIDE 1. Connect the positive terminal of the load to VOUT pins, and the negative terminal of the load to GND pins. 2. Preset power supply output to 4.75V to 23V and turn off the power supply. 3. Connect the positive terminal of the power supply output to VIN pin, and the negative terminal of the power supply output to GND pin. 4. Turn power supply on and the MP2309 will automatically startup. 5. To use Enable function, apply a digital input to EN pin. Drive EN higher than 2.5V to turn on the regulator, drive EN 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 EN threshold is 2.5V, so VIN UVLO threshold is: ⎜1 + ⎝ R4 ⎞ ⎟ × 2. 5 V . R5 ⎠ RECOMMENDED COMPONENTS FOR STANDARD OUTPUT VOLTAGES The output voltage of this board is set to 3.3V. This board is laid out to accommodate most commonly used inductors and output capacitors and to be programmed for most standard output voltages. The following table lists recommended components for some standard output voltages. Listed compensation components (R2, C3) values are based on the output capacitor installed on this board. VOUT 1.8V 2.5V 3.3V 5V 12V R1 9.53kΩ 16.9kΩ 26.1kΩ 44.2Ω 121kΩ R2 4.99kΩ 5.6kΩ 7.5kΩ 10kΩ 25.5kΩ C3 4.7nF 4.7nF 3.3nF 3.3nF 2.2nF L1 4.7µH 4.7µH to 6.8µH 6.8µH to 10µH 10µH to 15µH 33µH to 47µH 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. EV2309DS-00A Rev. 1.3 9/29/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. 4