RT4805AWSC

DC-DC开关升压升压稳压器, 可调, 1.8V至5V输入, 2.85V-4.4V/2A输出, WLCSP-16

The from is a 2.5MHz, synchronous boost regulator with bypass mode in 16 pin WL-CSP package. The RT4805A 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 RT4805A 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 1µA 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.

.

Few external components 0.47µH inductor and 0603 case size Input and output capacitors

.

Input voltage range from 1.8V to 5V

.

Output range from 2.85V to 4.4VVSEL = L 3.6V, VSEL = H 3.7V

.

Maximum continuous load current is 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, I2C controlled interface, ultra low quiescent current is 0.055mA