EV2145-D-00A 5.5V, 6A, 1.2MHz, High-Efficiency, 40μA IQ Constant On-Time Synchronous, Step-Down Switcher Evaluation Board The Future of Analog IC Technology DESCRIPTION FEATURES The MP2145 is a monolithic, step-down, switchmode converter with internal power MOSFETs. It can achieve up to 6A continuous output current from a 2.8V-to-5.5V input voltage with excellent load and line regulation. The output voltage can be regulated to as low as 0.6V. Constant-on-time control provides a fast transient response and eases loop stabilization. Fault condition protections include cycle-bycycle current limiting and thermal shutdown. • • • • • • • • • • The MP2145 is available in a small QFN2×3mm package and requires only a minimal number of readily-available, standard, external components. • • • The MP2145 is ideal for a wide range of applications, including storage (SSD, HDD), high-performance DSPs, FPGAs, and distributed power systems. • • • APPLICATIONS ELECTRICAL SPECIFICATION Parameter Input Voltage (1) Output Voltage Output Current Up to 6A Output Current Wide 2.8V-to-5.5V Operating Input Range 20mΩ and 12mΩ Internal Power MOSFETs 40µA Quiescent Current 1.2MHz Fixed Switching Frequency 1% Feedback Accuracy External Mode Control External VCON Control Adjustable Output from 0.6V 1.5ms Internal SS Time with Pre-Bias Startup Cycle-by-Cycle Over Current Protection Short Circuit Protection with Hiccup Mode Stable with Low-ESR Output Ceramic Capacitors Thermal Shutdown Available in a 2mm×3mm QFN Package Output Discharge Function Symbol Value Units VIN 2.8–5.5 V VOUT IOUT 1.2 6 V A Notes: 1) If VIN < 3.6V, need more input capacitors. • • • Storage (SSD, HDD) Portable Instruments Battery-Powered Devices All MPS parts are lead-free and adhere to the RoHS directive. For MPS green status, please visit MPS website under Products, Quality Assurance page. “MPS” and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc. EV2145-D-00A EVALUATION BOARD Board Number MPS IC Number EV2145-D-00A MP2145GD EV2145-D-00A Rev.1.0 www.MonolithicPower.com 8/14/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 1 EV2145-D-00A – 6A, 5.5V, 1.2MHZ, SYNC STEP-DOWN SWITCHER EVALUATION BOARD SCHEMATIC L1 744373240047 VIN 2.8V to 5.5V C1 C2 R5 100k C3 SW VIN C8 C9 C10 C6 C7 22uF 22uF NS NS NS OUT 10uF 10uF 0.1uF R1 200k MP2145 R3 NS PG R6 NS EN FB R2 200k PG MODE/ VCON MODE/ VCON R4 NS VOUT 1.2V/6A 0.47uH C4 1uF Ramp GND C5 NS EV2145-D-00A BILL OF MATERIALS Qty RefDes Value 2 1 1 2 1 1 1 1 C1, C2 C3 C4 C6,C7 L1 R1 R2 R5 10μF 0.1μF 1μF 22μF 0.47μH 200K 200K 100K 1 U1 0 C5,C8, C9,C10, R3,R4,R6 Description Ceramic Cap,10V,X5R Ceramic Cap,16V,X7R Ceramic Cap,6.3V,X7R Ceramic Cap,10V,X5R Inductor, 14.5A, 14mΩ Film Res,1% Film Res,1% Film Res,5% Synchronous step-down MP2145 switcher Package 0805 0603 0603 0805 4x4mm 0603 0603 0603 QFN12 (2x3mm) Manufacturer Manufacturer P/N muRata muRata muRata muRata Wurth ROYAL ROYAL ROYAL MPS GRM21BR61A106KE19L GRM188R71C104KA01D GRM188R60J105KA01D GRM21BR61A226ME51L 744 373 240 047 RL0603FR-07200KL RL0603FR-07200KL RC0603JR-07100KL MP2145GD NS EV2145-D-00A Rev.1.0 www.MonolithicPower.com 8/14/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 2 EV2145-D-00A – 6A, 5.5V, 1.2MHZ, SYNC STEP-DOWN SWITCHER EVB TEST RESULTS Performance waveforms are tested on the evaluation board. VIN = 5V, VOUT = 1.2V, L = 0.47µH, COUT = 22µF×2, TA = 25ºC, unless otherwise noted. EV2145-D-00A Rev.1.0 www.MonolithicPower.com 8/14/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 3 EV2145-D-00A – 6A, 5.5V, 1.2MHZ, SYNC STEP-DOWN SWITCHER EVB TEST RESULTS (continued) Performance waveforms are tested on the evaluation board. VIN = 5V, VOUT = 1.2V, L = 0.47µH, COUT = 22µF×2, TA = 25ºC, unless otherwise noted. EV2145-D-00A Rev.1.0 www.MonolithicPower.com 8/14/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 4 EV2145-D-00A – 6A, 5.5V, 1.2MHZ, SYNC STEP-DOWN SWITCHER EVB TEST RESULTS (continued) Performance waveforms are tested on the evaluation board. VIN = 5V, VOUT = 1.2V, L = 0.47µH, COUT = 22µF×2, TA = 25ºC, unless otherwise noted. EV2145-D-00A Rev.1.0 www.MonolithicPower.com 8/14/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 5 EV2145-D-00A – 6A, 5.5V, 1.2MHZ, SYNC STEP-DOWN SWITCHER EVB TEST RESULTS (continued) Performance waveforms are tested on the evaluation board. VIN = 5V, VOUT = 1.2V, L = 0.47µH, COUT = 22µF×2, TA = 25ºC, unless otherwise noted. EV2145-D-00A Rev.1.0 www.MonolithicPower.com 8/14/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 6 EV2145-D-00A – 6A, 5.5V, 1.2MHZ, SYNC STEP-DOWN SWITCHER PRINTED CIRCUIT BOARD LAYOUT Figure 1—Top Silk Layer Figure 2—Top Layer Figure 3—Inner 1 Layer Figure 4—Inner 2 Layer Figure 5—Bottom Layer EV2145-D-00A Rev.1.0 www.MonolithicPower.com 8/14/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 7 EV2145-D-00A – 6A, 5.5V, 1.2MHZ, SYNC STEP-DOWN SWITCHER QUICK START GUIDE 1. Connect the positive and negative terminals of the load to the VOUT and GND pins, respectively. 2. Preset the power supply output between 2.8V and 5.5V, and then turn off the power supply. 3. Connect the positive and negative terminals of the power supply output to the VIN and GND pins, respectively. 4. Turn the power supply on. The board will automatically start up. 5. To use the Enable function, apply a digital input to the EN pin. Drive EN higher than 1.2V to turn on the regulator or less than 0.4V to turn it off. LAYOUT RECOMMENDATION OF MP2145 Proper layout of the switching power supplies is very important, and sometimes critical to make it work properly. Especially, for the high switching converter, if the layout is not carefully done, the regulator could show poor line or load regulation, stability issues. For MP2145, the high speed step-down regulator, the input capacitor should be placed as close as possible to the IC pins. As shown in Figure 6, the 0805 size ceramic capacitor is used, please make sure the two ends of the ceramic capacitor be directly connected to PIN 8 (the Power Input Pin) and PIN 10/11/12 (the Power GND Pin). Cout Pin10,11 ,12 (PGND ) GND GNDGND 12 11 10 Lout SW 1 VIN OUT 2 8 VIN FB 3 GND R2 R1 Cin 9 SW 7 PG 4 RAMP 5 Pin8 (VIN ) 6 MODE/ EN VCON Figure 6— Two ends of Input decoupling Capacitor close to Pin 8 and Pin 10/11/12 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. EV2145-D-00A Rev.1.0 www.MonolithicPower.com 8/14/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 8