EV20045DN-00A Low Noise, 1A, Linear Regulator EV Board The Future of Analog IC Technology DESCRIPTION FEATURES The EV20045DN-00A evaluation board demonstrates the performance of MP20045, a low noise and low dropout linear regulator. It operates from a 2.5V to 5.5V input voltage and the output voltage can be set externally which ranges from 1.5V to 5V. • • • • • • • • The EV20045DN-00A can supply up to 1A of load current, and features current limiting, over temperature protection and power-good status. An internal PMOS pass element is used to allow a low 110uA ground current, marking the MP20045 suitable for battery-power devices. ELECTRICAL SPECIFICATIONS Parameter Symbol Value Units VIN 3.5 – 5.5 V Output Voltage VOUT 3 V Load Current IOUT 1 A Input Voltage Up to 1A Output Current Low 140mV Dropout at 1A Adjustable Output 56dB PSRR at 1kHz 13μVRMS Low Noise Output Open Drain Power-Good Status Output Very Fast Transient Responses Current Limit and Thermal Protection APPLICATIONS • • • • • • Notebook Computers Cordless Telephones Cellular Phones Modems Hand-Held Instruments PDA and Palmtop Computers MPS” and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc. EV20045DN-00A EVALUATION BOARD (L x W x H) 2.5” x 2.5” x 0.4” (6.35cm x 6.35cm x 1.1cm) EV20045DN-00A Rev. 1.0 11/3/2009 Board Number MPS IC Number EV20045DN-00A MP20045DN www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2009 MPS. All Rights Reserved. 1 EV20045DN-00A – LOW NOISE, 1A LINEAR REGULATOR EVALUATION BOARD SCHEMATIC PG U1 7,8 VIN C1 NS R3 100k VOUT 1,2 EN GND 4 VOUT R1 10k MP20045 6 EN 5 PG VIN R4 100k FB COUT NS 3 R2 10k EV20045DN-00A BILL OF MATERIALS Qty Ref Value 1 CIN 10uF 1 C2 2.2uF 1 C3 100pF 0 C1,COUT NS 2 R1, R2 10kΩ 2 R3, R4 100kΩ 1 U1 EV20045DN-00A Rev. 1.0 11/3/2009 Description Ceramic Capacitor,X7R,16V Ceramic Capacitor,X7R,16V Ceramic Capacitor,C0G,50V Film Res, 1% Film Res, 5% LDO Regulator Package Manufacturer 1210 TDK C3225X7R1C106M 0805 TDK C2012X7R1C225K 0603 TDK C1608C0G1H101J 0603 Any 0603 Any SOIC8E MPS www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2009 MPS. All Rights Reserved. Part Number MP20045DN 2 EV20045DN-00A – LOW NOISE, 1A LINEAR REGULATOR PRINTED CIRCUIT BOARD LAYOUT Figure 1—Top Layer Figure 2—Bottom Layer Figure 3—Top Silk Layer EV20045DN-00A Rev. 1.0 11/3/2009 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2009 MPS. All Rights Reserved. 3 EV20045DN-00A – LOW NOISE, 1A LINEAR REGULATOR QUICK START GUIDE (ADJUSTABLE OUTPUT) The output voltage of this board is set externally which ranges from 1.5V to 5V by operating from +2.5V to +5.5V input as the figure 4. The default output voltage of this board is set to 3.0V. The board layout accommodates most commonly used resistors and capacitors. 1. Attach the positive and negative ends of the load to the VOUT and GND pins, respectively. 2. Attach the Input Voltage (3.5V ≤ VIN ≤ 5.5V) and Input Ground to the VIN and GND pins, respectively. 3. To enable the MP20045, apply a voltage, 1.5V ≤ VEN ≤ 5.5V, to the EN pin. To disable the MP20045, apply a voltage, VEN < 0.4V, to the EN pin. The EN pin can be connected to VIN with a 100kΩ resistor for automatic startup. 4. The Output Voltage VOUT can be changed by varying R2. Calculate the new value by formula: R1 R2 = ( VOUT ) −1 VFB Where VFB = 1.5V and R1 = 10kΩ. Example: For VOUT = 3.0V: R2 = 10kΩ = 10kΩ 3.0 ( ) −1 1.5 Therefore, use a 10kΩ standard 1% value. VIN R3 100k VOUT R1 PG C3(optioanl) 0.1 MP20045 FB R2 EN COUT 2.2 VIN R3 100k VOUT CIN 10 PG MP20045 FB EN COUT 2.2 R1 VOUT =1.5 × (1+ R )Volts 2 Figure 4—Adjustable Version EV20045DN-00A Rev. 1.0 11/3/2009 Figure 5—Fixed Version www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2009 MPS. All Rights Reserved. 4 EV20045DN-00A – LOW NOISE, 1A LINEAR REGULATOR QUICK START GUIDE (MODIFICATION FOR FIXED OUTPUT) For modifying the EV20045DN-00A to accommodate a fixed output voltage version of the MP20045 as the figure 5: 1. Carefully remove the IC(U1) and replace it with the corresponding fixed output version of the MP20045 chip. 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 (3.5V ≤ VIN ≤ 5.5V) and Input Ground to the VIN and GND pins, respectively. 6. To enable the MP20045, apply a voltage, 1.5V ≤ VEN ≤ 5.5V, to the EN pin. To disable the MP20045, apply a voltage, VEN < 0.4V, to the EN pin. The EN pin can be connected to VIN with a 100kΩ resistor for automatic startup. Please refer to the datasheet for the detailed information of the different output voltage option of MP20045. 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. EV20045DN-00A Rev. 1.0 11/3/2009 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2009 MPS. All Rights Reserved. 5