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MP29296 Datasheet(PDF) 5 Page - Monolithic Power Systems |
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MP29296 Datasheet(HTML) 5 Page - Monolithic Power Systems |
5 / 10 page MP29296 – 2A, 23V SYNCHRONOUS RECTIFIED, STEP-DOWN CONVERTER MP29296 Rev. 1.7 www.MonolithicPower.com 5 2/5/2010 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2010 MPS. All Rights Reserved. OPERATION FUNCTIONAL DESCRIPTION The MP29296 is a synchronous rectified, current-mode, step-down regulator. It regulates input voltages from 4.75V to 23V down to an output voltage as low as 0.923V, and supplies up to 2A of load current. The MP29296 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 the 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 MP29296 FB pin exceeds 20% of the nominal regulation voltage of 0.923V, the over voltage comparator is tripped and the COMP pin and the SS pin are discharged to GND, forcing the high-side switch off. INTERNAL REGULATORS IN EN + ERROR AMPLIFIER 1.2V EN OK OVP RAMP CLK 0.923V 0.3V CURRENT COMPARATOR CURRENT SENSE AMPLIFIER 1.1V SHUTDOWN COMPARATOR LOCKOUT COMPARATOR 7 COMP 6 SS 8 FB 5 GND 4 OSCILLATOR 100/340KHz S R Q SW 3 BS 1 IN 5V 2 OVP IN < 4.10V 5V + Q + + 1.5V 2.5V + + + + EN -- -- -- -- -- -- -- Figure 1—Functional Block Diagram |
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