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MP2303DQ Datasheet(PDF) 7 Page - Monolithic Power Systems |
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MP2303DQ Datasheet(HTML) 7 Page - Monolithic Power Systems |
7 / 14 page MP2303 – 3A, 28V, 340KHz SYNCHRONOUS RECTIFIED, STEP-DOWN CONVERTER INITIAL RELEASE – SPECIFICATIONS SUBJECT TO CHANGE MP2303 Rev. 0.92 www.MonolithicPower.com 7 5/2/2006 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2006 MPS. All Rights Reserved. TM OPERATION MP2303_BD01 LOCKOUT COMPARATOR INTERNAL REGULATORS IN EN + ERROR AMPLIFIER 1.2V OVP RAMP CLK 0.8V 0.3V CURRENT COMPARATOR CURRENT SENSE AMPLIFIER 0.95V SHUTDOWN COMPARATOR COMP SS FB GND OSCILLATOR 340KHz S R Q SW BS IN 5V OVP IN < 4.05V EN OK + Q + + 1.5V + + 2.5V + + -- -- -- -- -- -- -- Figure 1—Functional Block Diagram The MP2303 is a synchronous rectified, current-mode, step-down regulator. It regulates input voltages from 4.75V to 28V down to an output voltage as low as 0.8V, and supplies up to 3A of load current. The MP2303 uses current-mode control to regulate the output voltage. The output voltage is measured at FB through a resistive voltage divider and amplified through the internal transconductance error amplifier. The voltage at COMP pin is compared to the switch current measured internally to control the output voltage. The converter uses internal N-Channel MOSFET switches to step-down the input voltage to the regulated output voltage. Since the high-side MOSFET requires a gate voltage greater than the input voltage, a boost capacitor connected between SW and BS is needed to drive the high-side gate. The boost capacitor is charged from the internal 5V rail when SW is low. When the MP2303 FB pin exceeds 20% of the nominal regulation voltage of 0.8V, the over voltage comparator is tripped; the COMP pin and the SS pin are discharged to GND, forcing the high-side switch off. |
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