RT4805B
2.5MHz, Synchronous Boost Regulator with Bypass Mode
General Description
The RT4805B allows systems to take ad...
RT4805B
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 1A, 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 : 0.47H 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-Circ...