RT4731

Triple Output AMOLED Bias

The RT4731 is a highly integrated Boost, two LDOs (one channel for AVDD and the other channel for VOP) and inverting charge pump to generate positive and negative output voltage. The negative output voltages can be adjusted from -0.6V to -2.4V with 100mV per step by SWIRE interface protocol. The part maintains the highest efficiency by utilizing a -0.33x/-0.5x mode fractional charge pump with automatic mode transition. With its input voltage range of 2.9V to 4.8V, the RT4731 is optimized for products powered by single-cell battery and the output current up to 30mA. The RT4731 is available in UBGA-21B 1.82x3.23 package to achieve optimized solution for PCB space.

Applications

AMOLED Bias in Portable Device

Key Spec.
	RT4731
Status	Last Time Buy
Vin (min) (V)	2.9
Vin (max) (V)	4.8
Number of Channels	3
Number of Buck Converters	0
Number of Boost Converters	1
Number of Negative Outputs	1
Number of LED Drivers	0
Number of LDO Regulators	1
Application	OLED for Watch
Features	Current Mode Control;Cycle-by-Cycle Current Limit;Enable Input;Fast Transient Response;Internal Compensation;OCP;SCP;UVP
Package Type	UBGA1.82x3.23-21

Features

2.9V to 4.8V Supply Voltage Range
Single Wire Protocol
Fixed 4.6V Positive Voltage Output
Positive Output Voltage AVDD 2.8V
Negative Voltage Output from -0.6V to -2.4V per 0.1V by SWIRE Pin
Auto-Mode Transition of -0.33x/-0.5x Charge Pump
Built-in Soft-Start
30mA Maximum Output Current
Programmable Output Fast Discharge Function
High Impedance Output when IC Shutdown
UVLO, OCP, SCP, OTP Protection
Shutdown Current < 1μA
Available in 21-Ball UBGA Package

Datasheet
Title	Version	Last Update	Download
RT4731: Triple Output AMOLED Bias	V2.0	2019/04/10

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