MP2112DQ

EV2112DQ-00A 1A, 1MHz Synchronous Step-Down Converter The Future of Analog IC Technology EVALUATION BOARD DESCRIPTION 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. The MP2112 is available in a space-saving 6-pin 3mmx3mm QFN package with an exposed pad. FEATURES • • • • • • • • • • High Efficiency: Up to 95% 1A Available Load Current 2.5V to 6V Input Voltage Range Cellular and Smart Phones Microprocessors and DSP Core Supplies PDAs MP3 Players Set-top Box Digital Still and Video Cameras Portable Instruments APPLICATIONS “MPS” and “The Future of Analog IC Technology”, are Trademarks of Monolithic Power Systems, Inc. ELECTRICAL SPECIFICATIONS Parameter Input Voltage Output Voltage Output Current Symbol VIN VOUT IOUT Value 2.5 – 6 1.8 1 Units V V A EV2111/12DQ-00A EVALUATION BOARD Efficiency vs Load Current 100 90 80 EFFICIENCY (%) VIN = 3.3V VIN = 4.2V 70 60 50 40 30 20 10 0 10 (L x W x H) 2.1”x 2.1” x 0.4” (5.3cm x 5.3cm x 1.0cm) Board Number EV2111/12DQ-00A EV2112DQ-00A Rev. 1.0 3/17/2006 MPS IC Number MP2112DQ 100 LOAD CURRENT (mA) 1000 MP2112-EC01 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 VIN GND 5 VINA EN 6 EN C3 1nF 4 VINB MP2112 SW 3 VOUT 1.8V @ 1A GND FB 1 U1 GND 2 EV2112_S01 EV2112DQ-00A BILL OF MATERIALS Qty Ref Value Description Ceramic Cap., 10V, X7R 1 C1 10µF Ceramic Cap., 10V, X7R Ceramic Cap., 10V, X7R Ceramic Cap., 10V, X5R 1 1 1 1 1 1 1 C2 C3 L1 R1 R2 R3 U1 22µF 1nF 4.7µH 499kΩ 249kΩ 220kΩ MP2112 Ceramic Cap, 6.3V, X5R Ceramic Cap., 50V, X7R 4.7µH, 2A, D63CB 4.7µH, 1.87A, D53LC 4.7µH, 1.6A, CDC5D23 Resistor, 1% Resistor, 1% Resistor, 5% DC-DC Converter Package Manufacturer 1206 1210 1210 1210 1210 0805 SMD SMD SMD 0805 0805 0805 QFN6 KEMET AVX TDK TDK TDK TOKO TOKO Sumida Panasonic Panasonic Panasonic MPS Manufacturer P/N C1206C106K8RAC C1210C106K8RAC 1210ZC106KAT2A C3225X5R1A106K C3225X5R0J226M C2012X7R1H102K A916CY-4R7M A915AY-4R7M CDC5D23B-4R7MC ERJ-6ENF4993V ERJ-6ENF2493V ERJ-6GEYJ224V 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