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