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RT7263B Datasheet(PDF) 3 Page - Richtek Technology Corporation |
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RT7263B Datasheet(HTML) 3 Page - Richtek Technology Corporation |
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3 / 15 page  RT7263B 3 DS7263B-01 September 2012 www.richtek.com © Copyright 2012 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. Function Block Diagram Operation The RT7263B is a constant frequency, current mode synchronous step-down converter. In normal operation, the high side N-MOSFET is turned on when the S-R latch is set by the oscillator and is turned off when the current comparator resets the S-R latch. While the high side N-MOSFET is turned off, the low side N-MOSFET is turned on to conduct the inductor current until next cycle begins. Error Amplifier The error amplifier adjusts its output voltage by comparing the feedback signal (VFB) with the internal reference. When the load current increases, it causes a drop in the feedback voltage relative to the reference, the error amplifier's output voltage then rises to allow higher inductor current to match the load current. Oscillator The internal oscillator runs at fixed frequency 500kHz. In short circuit condition, the frequency is reduced to 150kHz for low power consumption. Internal Regulator The regulator provides low voltage power to supply the internal control circuits and the bootstrap power for high side gate driver. Enable The converter is turned on when the EN pin is higher than 2V. When the EN pin is lower than 0.4V, the converter will enter shutdown mode and reduce the supply current to be less than 1 μA. Soft-Start (SS) An internal current source charges an internal capacitor to build a soft-start ramp voltage. The FB voltage will track the internal ramp voltage during soft-start interval. The typical soft-start time is 4ms. UV Comparator If the feedback voltage (VFB) is lower than 0.4V, the UV Comparator will go high to turn off the high side MOSFET. The output under voltage protection is designed to operate in Hiccup mode. When the UV condition is removed, the converter will resume switching. Thermal Shutdown The over temperature protection function will shut down the switching operation when the junction temperature exceeds 150 °C. Once the junction temperature cools down by approximately 30 °C, the converter will automatically resume switching. S Q R Driver - + Current Sense Amplifier PWM Comparator Oscillator Ramp Generator Regulator Reference + - Error Amplifier SW BOOT FB EN VIN GND + - + 10µA SS VCC 400k 30pF 1pF OC Limit Clamp SYNC |
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