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RT4805BWSC Datasheet(PDF) 1 Page - Richtek Technology Corporation |
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RT4805BWSC Datasheet(HTML) 1 Page - Richtek Technology Corporation |
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1 / 23 page  RT4805B Copyright © 2017 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. DS4805B-01 April 2017 www.richtek.com 1 2.5MHz, Synchronous Boost Regulator with Bypass Mode General Description The RT4805B allows systems to take advantage of new battery chemistries that can supply significant energy when the battery voltage is lower than the required voltage for system power ICs. By combining built-in power transistors, synchronous rectification, and low supply current; this IC provides a compact solution for systems using advanced Li-Ion battery chemistries. The RT4805B is a boost regulator designed to provide a minimum output voltage from a single-cell Li-Ion battery, even when the battery voltage is below system minimum. In boost mode, output voltage regulation is guaranteed to a maximum load current of 2A. Quiescent current in Shutdown Mode is less than 1 A, which maximizes battery life. The regulator transitions smoothly between Bypass and normal Boost Mode. The device can be forced into Bypass Mode to reduce quiescent current. The RT4805B is available in the WL-CSP-16B 1.67x1.67 (BSC) package. Features 4 Few External Components : 0.47 H Inductor and 0603 Case Size Input and Output Capacitors Input Voltage Range : 1.8V to 5V Output Range from 2.85V to 4.4V VSEL = L 3.15V VSEL = H 3.6V Maximum Continuous Load Current : 2A at VIN > 2.65V Boosting VOUT to 3.35V Up to 96% Efficient True Bypass Operation when VIN > Target VOUT Internal Synchronous Rectifier True Load Disconnect when Shut Down Forced Bypass Mode VSEL Control to Optimize Target VOUT Short-Circuit Protection I 2C Controlled Interface Ultra Low Operating Quiescent Current Small WL-CSP 16B Package Applications Single-Cell Li-Ion, LiFePO4 Smart-Phones or Tablet 2.5G/3G/4G Mini-Module Data Cards Simplified Application Circuit VIN RT4805B VOUT LX VSEL EN AGND PGND CIN + - nBYP COUT SCL SDA L1 PGOOD To pull high voltage |
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