General Description
The RT4823 integrates built-in power transistors,
synchronous rectification, and low supply current to
provide a compact solution for systems using advanced
Li-Ion battery chemistries. The RT4823 is capable of
supplying significant energy when the battery voltage is
lower than the required voltage for system power ICs.
The RT4823 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 1500mA.
Quiescent current in shutdown mode is less than 1A,
which maximizes the 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 RT4823 is available in the WL-CSP-9B 1.3x1.2
(BSC) package.

Applications
NFC Device Power Supply
USB Charging Ports
PC Accessory Application (Keyboard, Mouse...etc.)
TWS (True Wireless Stereo) Hall Sensor
Gaming Device Sensor

Features
⚫ Ultra-Low Operating Quiescent Current
⚫ Quickly Start-Up Time (< 400sec)
⚫ 3 Few External Components : 1H Inductor, 0402
Case Size Input and 0603 Case Size Output Case
Size Capacitors
⚫ Input Voltage Range : 1.8V to 5.5V
⚫ Support VIN > VOUT Operation
⚫ Default Boost Output Voltage Setting :
VOUT = 5V
⚫ Maximum Continuous Load Current : 1.3A at
VIN > 3.6V Boosting VOUT to 5V
⚫ Up to 93% Efficiency
⚫ EN(H) : Boost Mode
⚫ EN(L), BP(H) : Bypass Mode
⚫ EN(L), BP(L) : Shutdown Mode
⚫ Internal Synchronous Rectifier
⚫ Over-Current Protection
⚫ Cycle-by-Cycle Current Limit
⚫ Over-Voltage Protection
⚫ Short-Circuit Protection
⚫ Over-Temperature Protection
⚫ Small WL-CSP-9B 1.3x1.2 (BSC) Package