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| TM EV2104DJ-00A 600mA Synchronous Buck Step-Down Converter The Future of Analog IC Technology TM DESCRIPTION The EV2104 evaluation board is designed for low dropout step down converter applications. It implements the MP2104 1.7MHz Fixed 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 equipments that runs from a single cell Lithium-Ion (Li+) Battery. It can supply 600mA of load current from a 2.5V to 6V input voltage. The output voltage can be regulated as low as 0.6V. In 100% Duty Cycle Dropout operation, it works with minimum input voltage as low as output voltage. FEATURES * * * * * * * * * High Efficiency: Up to 95% 600mA Available Load Current 2.5V to 6V Input Voltage Range Output Voltage as Low as 0.6V 100% Duty Cycle in Dropout Short Circuit Protection Thermal Fault Protection <0.1A Shutdown Current Programmable Enable Control Cellular and Smart Phones Microprocessors/DSP Core Supplies PDAs MP3 Players Digital Still and Video Cameras Portable Instruments APPLICATIONS ELECTRICAL SPECIFICATIONS Parameter Input Voltage Range Output Voltage Load Max Symbol VIN VOUT IOUT Value 2.5 - 6.0 1.8 600 Units V V mA * "Monolithic Power Systems" and "The Future of Analog IC Technology" are Trademarks of Monolithic Power Systems, Inc. EV2104DJ-00A EVALUATION BOARD Efficiency vs Load Current 100 90 80 VIN = 3.3V VIN = 4.2V EFFICIENCY (%) 70 60 50 40 30 20 10 Dimensions (2.0"X x 2.0"Y x 0.5"Z) Board Number EV2104DJ-00A MPS IC Number MP2104DJ 0 10 100 LOAD CURRENT (mA) 1000 MP2104-TPC01 EV2104DJ-00A Rev. 1.1 8/24/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved. 1 TM EV2104DJ-00A - 600mA SYNCHRONOUS BUCK STEP-DOWN CONVERTER EVALUATION BOARD SCHEMATIC J1 INPUT 2.5V - 6V IN SW VOUT R3 NS EN MP2104 GND FB OFF ON C3 NS EV2104_S01 EV2104DJ-00A BILL OF MATERIALS Qty 1 1 1 1 1 1 1 1 1 Ref C1 C2 C3 J1 L1 R1 R2 R3 U1 Value Description Ceramic Capacitor, 6.3V, X5R Ceramic Capacitor, 6.3V, X5R Do Not Stuff Jumper 10H 1.04A 300k Resistor, 1% 150k Resistor, 1% Do Not Stuff DC-DC Converter 4.7F 10F Package SM0805 SM0805 Manufacturer AVX AVX Manufacturer P/N 08056D475KAT2A 08056D106KAT2A SMD SM0805 SM0805 SOT23-5 Sumida Yageo Panasonic MPS CR43-100 9C08052A3003FKHFT ERJ-6ENF1503V MP2104DJ EV2104DJ-00A Rev. 1.1 8/24/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved. 2 TM EV2104DJ-00A - 600mA SYNCHRONOUS BUCK STEP-DOWN CONVERTER PRINTED CIRCUIT BOARD LAYOUT Figure 1--Top Silk Layer Figure 2--Top Layer Figure 3--Bottom Silk Layer Figure 4--Bottom Layer EV2104DJ-00A Rev. 1.1 8/24/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved. 3 EV2104DJ-00A - 600mA SYNCHRONOUS BUCK STEP-DOWN CONVERTER INITIAL RELEASE QUICK START GUIDE (ADJUSTABLE OUTPUT) The default output voltage of this board is set to 1.8V. The board layout accommodates most commonly used inductors and output capacitors. 1. Attach the positive and negative ends of 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. 3. To enable the MP2104 apply a voltage, 1.5V VEN 6V, to the EN pin. To disable the MP2104 apply a voltage, VEN < 0.3V, to the EN pin. The default setting for the jumper J1 on the board connects VIN to the EN pin. In this configuration, the part will operate without applying any external voltage to the EN pin. 4. The Output Voltage VOUT can be changed by varying R2. Calculate the new value by formula: R2 = R1 VOUT -1 V FB Where VFB = 0.6V and R1 = 300k. Example: For VOUT = 2.5V: R2 = 300k = 150k 2.5 V -1 0. 6 V Therefore, use a 150k standard 1% value. QUICK START GUIDE (MODIFICATION FOR FIXED OUTPUT) For modifying the EV2104DJ-00A to accommodate a fixed output voltage version of the MP2104: 1. Verify that a fixed output version of the MP2104 chip is on the evaluation board. Refer to MP2104 datasheet for fixed voltage package codes. 2. Remove both R1 and R2. 3. Short R1 while leaving R2 open. 4. Attach the positive and negative ends of the load to the VOUT and GND pins, respectively. 5. Attach the Input Voltage (2.5V VIN 6V) and Input Ground to the VIN and GND pins, respectively. 6. To enable the MP2104 apply a voltage, 1.5V VEN 6V, to the EN pin. To disable the MP2104 apply a voltage, VEN < 0.3V, to the EN pin. The default setting for the jumper J1 on the board connects VIN to the EN pin. In this configuration, the part will operate without applying any external voltage to the EN pin. 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. Ev2104DJ-00A Rev. 1.1 8/24/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved. 4 |
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