EV2112DQ-00A 1A, 1MHz Synchronous Step-Down Converter The Future of Analog IC Technology EVALUATION BOARD DESCRIPTION FEATURES The EV2111/12DQ-00A is an evaluation board for the MP2112DQ. • • • The MP2112 is a 1MHz constant frequency, current mode, PWM step-down converter. The device integrates a main switch and a synchronous rectifier for high efficiency without an external Schottky diode. It is ideal for powering portable equipment that runs from a single cell Lithium-Ion (Li+) battery. The MP2112 can supply 1A of load current from a 2.5V to 6V input voltage. The output voltage can be regulated as low as 0.6V. The MP2112 can also run at 100% duty cycle for low dropout applications. High Efficiency: Up to 95% 1A Available Load Current 2.5V to 6V Input Voltage Range APPLICATIONS • • • • • • • Cellular and Smart Phones Microprocessors and DSP Core Supplies PDAs MP3 Players Set-top Box Digital Still and Video Cameras Portable Instruments “MPS” and “The Future of Analog IC Technology”, are Trademarks of Monolithic Power Systems, Inc. The MP2112 is available in a space-saving 6-pin 3mmx3mm QFN package with an exposed pad. ELECTRICAL SPECIFICATIONS Parameter Input Voltage Output Voltage Output Current Symbol Value Units VIN VOUT IOUT 2.5 – 6 1.8 1 V V A EV2111/12DQ-00A EVALUATION BOARD Efficiency vs Load Current 100 90 VIN = 3.3V EFFICIENCY (%) 80 VIN = 4.2V 70 60 50 40 30 20 (L x W x H) 2.1”x 2.1” x 0.4” (5.3cm x 5.3cm x 1.0cm) Board Number MPS IC Number EV2111/12DQ-00A MP2112DQ 10 0 10 100 LOAD CURRENT (mA) 1000 MP2112-EC01 EV2112DQ-00A Rev. 1.0 3/17/2006 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2006 MPS. All Rights Reserved. 1 EV2112DQ-00A – 1A, 1MHz SYNCHRONOUS STEP-DOWN CONVERTER EVALUATION BOARD EVALUATION BOARD SCHEMATIC 5 VIN EN VINA 6 EN C3 1nF GND 4 VINB MP2112 SW 3 VOUT 1.8V @ 1A GND FB U1 1 GND 2 EV2112_S01 EV2112DQ-00A BILL OF MATERIALS Qty 1 Ref C1 Value 10µF Description Package Manufacturer Manufacturer P/N Ceramic Cap., 10V, X7R 1206 Ceramic Cap., 10V, X7R 1210 Ceramic Cap., 10V, X7R 1210 AVX 1210ZC106KAT2A Ceramic Cap., 10V, X5R 1210 TDK C3225X5R1A106K KEMET C1206C106K8RAC C1210C106K8RAC 1 C2 22µF Ceramic Cap, 6.3V, X5R 1210 TDK C3225X5R0J226M 1 C3 1nF Ceramic Cap., 50V, X7R 0805 TDK C2012X7R1H102K 1 L1 4.7µH 4.7µH, 2A, D63CB SMD TOKO A916CY-4R7M 4.7µH, 1.87A, D53LC SMD TOKO A915AY-4R7M 4.7µH, 1.6A, CDC5D23 SMD Sumida CDC5D23B-4R7MC 1 R1 499kΩ Resistor, 1% 0805 Panasonic ERJ-6ENF4993V 1 R2 249kΩ Resistor, 1% 0805 Panasonic ERJ-6ENF2493V 1 R3 220kΩ Resistor, 5% 0805 Panasonic ERJ-6GEYJ224V 1 U1 MP2112 DC-DC Converter QFN6 MPS MP2112DQ EV2112DQ-00A Rev. 1.0 3/17/2006 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2006 MPS. All Rights Reserved. 2 EV2112DQ-00A – 1A, 1MHz SYNCHRONOUS STEP-DOWN CONVERTER EVALUATION BOARD PRINTED CIRCUIT BOARD LAYOUT Figure 1—Top Silk Layer Figure 2—Top Layer Figure 3—Bottom Silk Layer EV2112DQ-00A Rev. 1.0 3/17/2006 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2006 MPS. All Rights Reserved. 3 EV2112DQ-00A – 1A, 1MHz SYNCHRONOUS STEP-DOWN CONVERTER EVALUATION BOARD QUICK START GUIDE The output voltage of this board is set to 1.8V, and the board accommodates most commonly used inductors and capacitors. 1. Attach the positive and negative ends ot the load to the VOUT and GND pins, respectively. 2. Attach the input voltage (2.5V ≤ VIN ≤ 6V) and input ground to the VIN and GND pins, respectively. The IC should automatically startup. To operate the IC through the enable pin without automatic startup, first remove resistor R3. Apply a voltage greater than 1.5V to enable the IC; lower than 0.3V to shut it off. Be careful not to exceed 6V on the EN pin. 3. The output voltage of this board can be changed by varying the value of resistor R2. Calculate the value of R2 using the equation: R2 = R1 VOUT −1 VFB Where VFB=0.6V and R1=499kΩ. For example, if VOUT=2.5V is desired: R2 = 499k = 158k 2. 5 V −1 0. 6 V Therefore, use a 158kΩ (1%) resistor for R2. 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. EV2112DQ-00A Rev. 1.0 3/17/2006 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2006 MPS. All Rights Reserved. 4