TM EV2109DQ-00A Dual 800mA, 6V, 1.2MHz Synchronous Step-Down Converter Evaluation Board The Future of Analog IC Technology TM DESCRIPTION FEATURES The EV2109DQ-00A is the evaluation board for the MP2109. The MP2109 contains two independent 1.2MHz constant frequency, current mode, PWM step-down converters. • • • • Each converter integrates a main switch and a synchronous rectifier for high efficiency without an external Schottky diode. The MP2109 is ideal for powering portable equipment that runs from a single cell Lithium-Ion (Li+) battery. Each converter can supply 800mA of load current from a 2.5V to 6V input voltage. The output voltage can be regulated as low as 0.6V. It can also run at 100% duty cycle for low dropout applications. Up to 95% Efficiency 800mA Load Current on Each Channel 2.5V to 6V Input Voltage Range Output Voltage as Low as 0.6V APPLICATIONS • • • • • • Cellular and Smart Phones Microprocessors and DSP Core Supplies PDAs MP3 Players Digital Still and Video Cameras Portable Instruments “MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic Power Systems, Inc. ELECTRICAL SPECIFICATIONS Parameter Input Voltage Output Voltage 1 Output Voltage 2 Load Max Symbol Value Units VIN1/IN2 VOUT1 VOUT2 2.5 to 6 1.8 1.2 800 V V V mA IOUT1/OUT2 EV2109DQ-00A EVALUATION BOARD Efficiency vs Load Current 100 VOUT=1.8V EFFICIENCY (%) 90 80 VOUT=1.2V 70 60 (L x W x H) 2.0” x 1.6” x 0.4” (5.0cm x 4.0cm x 1.0cm) Board Number Package QFN10 EV2109DQ-00A (3mm x 3mm) EV2109DQ-00A Rev. 1.1 10/14/2005 MPS IC Number 50 0.0 0.2 0.4 0.6 LOAD CURRENT (A) 0.8 EV2109_EC01 MP2109DQ www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. 1 TM EV2109DQ-00A – DUAL 800mA, 6V, 1.2MHz SYNCHRONOUS STEP-DOWN CONVERTER EVALUATION BOARD EVALUATION BOARD SCHEMATIC VOUT1 1.8V / 800mA EN1 C5 NS 1 2 3 VIN 4 10 U1 EN1 SW1 FB1 GND MP2109 IN2 IN1 FB2 GND SW2 5 9 8 7 EN2 6 VOUT2 1.2V / 800mA EN2 C6 NS EV2109_S01 EV2109DQ-00A BILL OF MATERIALS Qty Ref Value Description Package Manufacturer 2 C1, C2 10µF Ceramic Capacitor, 6.3V, X5R 1206 Any 2 C3, C4 22µF Ceramic Capacitor, 6.3V, X5R 1206 Any 2 C5, C6 NS 2 L1, L2 SMD Sumida Do Not Stuff 2.2µH Inductor, 1.2A 0603 Any 2 R1, R3, 300kΩ Resistor, 1% R4 R2 150kΩ Resistor, 1% 0603 Any 2 R5, R6 0603 Any 1 U1 QFN10 (3mm x 3mm) MPS 3 100kΩ Resistor, 5% EV2109DQ-00A Rev. 1.1 10/14/2005 Manufacturer P/N DC-DC Converter www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. CDRH3D16-2R2 MP2109DQ 2 TM EV2109DQ-00A – DUAL 800mA, 6V, 1.2MHz SYNCHRONOUS STEP-DOWN CONVERTER EVALUATION BOARD PRINTED CIRCUIT BOARD LAYOUT Figure 1—Top Silk Layer Figure 2—Top Layer Figure 3—Bottom Layer EV2109DQ-00A Rev. 1.1 10/14/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. 3 TM EV2109DQ-00A – DUAL 800mA, 6V, 1.2MHz SYNCHRONOUS STEP-DOWN CONVERTER EVALUATION BOARD QUICK START GUIDE The output voltages of this board are set to 1.8V (VOUT1) and 1.2V (VOUT2). The board layout accommodates most commonly used inductors and output capacitors. 1. Attach the positive and negative ends of the first load to the VOUT1 and GND pins, respectively. If using both outputs, attach the positive and negative ends of the second load to the VOUT2 and GND pins, respectively. 2. Attach the input voltage 2.5V ≤ VIN ≤ 6V and input ground to VIN and GND pins respectively. 3. A 100kΩ pull-up resistor has been connected to both the EN1 and EN2 pins, so both VOUT1 and VOUT2 will turn on without applying any external voltage to the EN1 and EN2 pins. 4. To turn on VOUT1/VOUT2 by using the EN1/EN2 functions, apply a voltage, 1.5V ≤ VEN1/EN2 ≤ 6V, to the EN1/EN2 pin. To disable VOUT1/VOUT2, apply a voltage, VEN1/EN2 < 0.3V, to the EN1/EN2 pin. 5. The output voltages VOUT1 and VOUT2 can be changed by varying R2 and R4, respectively. Calculate the new values by the following formulae: R2 = R4 = R1 ⎛ VOUT1 ⎞ ⎜⎜ ⎟⎟ − 1 ⎝ VFB ⎠ R3 ⎛ VOUT 2 ⎜⎜ ⎝ VFB ⎞ ⎟⎟ − 1 ⎠ Where VFB = 0.6V, R1 = 300kΩ and R3 = 300kΩ. Example: For VOUT1 = 1.8V: R2 = 300kΩ = 150kΩ ⎛ 1.8 V ⎞ ⎜ ⎟ −1 ⎝ 0 .6 V ⎠ Therefore, use a 150kΩ standard 1% value. 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. EV2109DQ-00A Rev. 1.1 10/14/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. 4