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MP2143 Datasheet(PDF) 13 Page - Monolithic Power Systems |
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MP2143 Datasheet(HTML) 13 Page - Monolithic Power Systems |
13 / 14 page MP2143 – 3A, 5.5V, 1.2MHz, 40μA IQ, COT SYNCHRONOUS STEP-DOWN SWITCHER MP2143 Rev. 1.07 www.MonolithicPower.com 13 7/4/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. Selecting the Output Capacitor The output capacitor (C2) maintains the output DC voltage. Use ceramic capacitors. Low-ESR capacitors keep the output voltage ripple low. The output voltage ripple can be estimated by: OUT OUT OUT ESR S1 IN S VV 1 V1 R fL V 8 f C2 Where L1 is the inductor value and RESR is the equivalent series resistance of the output capacitor. Using ceramic capacitors, the impedance at the switching frequency is dominated by the capacitance. The output voltage ripple is mainly caused by the capacitance. For simplification, the output voltage ripple can be estimated by: OUT OUT OUT 2 IN S1 VV ΔV1 V 8f L C2 For tantalum or electrolytic capacitors, the ESR dominates the impedance at the switching frequency. For simplification, the output ripple can be approximated as: OUT OUT OUT ESR IN S1 VV ΔV1 R fL V The characteristics of the output capacitor also affect the stability of the regulation system. PCB Recommendation of MP2143 Proper layout of the switching power supplies is very important, and sometimes critical for proper operation. For high-frequency switching converters, poor layout could lead to poor line or load regulation and stability issues. The high current paths (GND, VIN, and SW) should be placed very close to the device using short, direct, and wide traces. The input capacitor needs to be as close as possible to the VIN and GND pins. The external feedback resistors should be placed next to the FB pin. Keep the switching node SW short and away from the feedback network. 8 7 6 5 L1 R4 R3 1 2 3 4 OUT VIN GND SW C1 C1A Figure 3: Layout Recommendation TYPICAL APPLICATION CIRCUITS MP2143 VIN 2.5-5.5V R3 100k R2 200k R1 200k R4 499k U1 SW VOUT GND C2A NS 1206 IN EN PG PGND AGND FB OUT SW 2 8 1 46 7 5 3 GND EN PG VIN Figure 4: MP2143 Typical Application Circuit |
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