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MP8670 Datasheet(PDF) 10 Page - Monolithic Power Systems |
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MP8670 Datasheet(HTML) 10 Page - Monolithic Power Systems |
10 / 15 page MP8670 – 6A, 30V, 420KHZ STEP-DOWN WITH SYNCHRONIZABLE GATE DRIVER MP8670 Rev. 1.3 www.MonolithicPower.com 10 4/4/2011 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. OPERATION IN EN/SYNC FB SW VCC BG GND BST REGULATOR OSCILLATOR 420KHz DRIVER CURRENT SENSE AMPLIFIER ERROR AMPLIFIER COMP CURRENT LIMIT COMPARATOR PWM COMPARATOR DRIVER D REGULATOR REFERENCE -- + -- + -- + S R R Q Q 54pF 1pF VCC VCC Figure 1—Functional Block Diagram The MP8670 is a fixed frequency, synchronous, step-down switching regulator with an integrated high-side power MOSFET and a gate driver for a low-side external MOSFET. It achieves 6A continuous output current over a wide input supply range with excellent load and line regulation. It provides a single highly efficient solution with current mode control for fast loop response and easy compensation. The MP8670 operates in a fixed frequency, peak current control mode to regulate the output voltage. A PWM cycle is initiated by the internal clock. The integrated high-side 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 until the next clock cycle starts. If, in 90% of one PWM period, the current in the power MOSFET does not reach the COMP set current value, the power MOSFET will be forced to turn off. Error Amplifier The error amplifier compares the FB pin voltage with the internal 0.8V reference (REF) and outputs a current proportional to the difference between the two. This output current is then used to charge or discharge the internal compensation network to form the COMP voltage, which is used to control the power MOSFET current. The optimized internal compensation network minimizes the external component counts and simplifies the control loop design. Internal Regulator Most of the internal circuitries are powered from the 5V internal regulator. This regulator takes the VIN input and operates in the full VIN range. When VIN is greater than 5.0V, the output of the regulator is in full regulation. When VIN is lower than 5.0V, the output decreases. Since this internal regulator provides the bias current for the bottom gate driver that requires significant amount of current depending upon the external MOSFET selection, a 1µF ceramic capacitor for decoupling purpose is required. |
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