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MP1542 Datasheet(PDF) 5 Page - Monolithic Power Systems |
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MP1542 Datasheet(HTML) 5 Page - Monolithic Power Systems |
5 / 10 page MP1542 – 700KHz/1.3MHz BOOST CONVERTER WITH A 2A SWITCH MP1542 Rev. 1.3 www.MonolithicPower.com 5 9/7/2006 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2006 MPS. All Rights Reserved. PIN FUNCTIONS Pin # Name Description 1 COMP Compensation Pin. Connect a capacitor and resistor in series to ground for loop stability. 2 FB Feedback Input. Reference voltage is 1.25V. Connect a resistor divider to this pin. 3 EN Regulator On/Off Control Input. A high input at EN turns on the converter, and a low input turns it off. When not used, connect EN to the input source (through a 100kΩ pull-up resistor if VIN > 6V) for automatic startup. EN cannot be left floating. 4 GND Ground. 5 SW Power Switch Output. SW is the drain of the internal MOSFET switch. Connect the power inductor and output rectifier to SW. SW can swing between GND and 25V. 6 IN Input Supply Pin. IN must be locally bypassed. 7 FSEL Frequency Select Pin. Tie to IN (through a 100kΩ resistor if VIN > 6V) for 1.3MHz operation or to GND for 700KHz operation. 8 SS Soft-Start Control Pin. Connect a soft-start capacitor to this pin. The soft-start capacitor is charged with a constant current of 6µA. OPERATION The MP1542 uses a constant frequency, peak current mode boost regulation architecture to regulate the feedback voltage. The operation of the MP1542 can be understood by referring to the block diagram of Figure 1. PWM CONTROL LOGIC CURRENT SENSE AMP OSCILLATOR INTERNAL REGULATOR AND ENABLE CIRCUITRY -- + GM + -- GND FB COMP SS 1.25V SW IN -- + FSEL EN 4 5 2 1 3 7 8 6 Figure 1—Functional Block Diagram |
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