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MP4561DQ Datasheet(PDF) 7 Page - Monolithic Power Systems |
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MP4561DQ Datasheet(HTML) 7 Page - Monolithic Power Systems |
7 / 17 page MP4561 – 1.5A, 2MHz, 55V STEP-DOWN CONVERTER MP4561 Rev. 1.0 www.MonolithicPower.com 7 11/5/2012 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. BLOCK DIAGRAM -- + LOGIC -- + COMP ISW VIN BST SW FREQ GND COMP FB EN SS 0V8 REFERENCE UVLO INTERNAL REGULATORS OSCILLATOR Figure 1—Functional Block Diagram OPERATION The MP4561 is a programmable frequency, non-synchronous, step-down switching regulator with an integrated high-side high voltage power MOSFET. It provides a single highly efficient solution with current mode control for fast loop response and easy compensation. It features a wide input voltage range, external soft-start control for start-up ramp-up flexibility, and precision current limiting. Its very low operational quiescent current makes it suitable for battery powered applications. PWM Control Mode At moderate to high output current, the MP4561 operates in a fixed frequency, peak current control mode to regulate the output voltage. A PWM cycle is initiated by the internal clock. The power MOSFET is turned on and remains on until its current reaches the value set by the COMP voltage. When the power switch is off, it remains off for at least 100ns before the next cycle starts. If, in one PWM period, the current in the power MOSFET does not reach the COMP set current value, the power MOSFET remains on, saving a turn-off operation. Pulse Skipping Mode Under light load condition the switching frequency stretches down zero to reduce the switching loss and driving loss. Error Amplifier The error amplifier compares the FB pin voltage with the internal reference (REF) and outputs a current proportional to the difference between the two. This output current is then used to charge the external compensation network to form the COMP voltage, which is used to control the power MOSFET current. |
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