RT8203GA

Voltage - Supply (Vcc/Vdd):	7 V ~ 24 V
Supplier Device Package:	28-SSOP
Package / Case:	28-SSOP (0.154", 3.90mm Width)
Operating Temperature:	-10°C ~ 85°C (TA)
Control Features:	Current Limit, Enable, On Time Control, Phase Control, Power Good
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	80%, 84%, 88%, 92%
Frequency - Switching:	200kHz, 300kHz, 400kHz, 500kHz
Series:	--
Output Phases:	1
Number of Outputs:	4
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tape & Reel (TR)

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IntroductionRT8203GA is a high performance DC-DC switch controller with current mode operation, enabling a variety of multi-phase DC-DC converters. It provides Constant On-Time (COT) control in 1S, 2S and 3S configurations. The RT8203GA ensures an accurate valley current protection for current-mode control and low EMI for universal voltage input applications.Application FieldRT8203GA is an ideal choice for a variety of portable power systems. It is suitable for applications such as battery chargers, DC/DC converter, and adapters for notebooks, tablet PCs, mobile phones, and various consumer electronics. In addition, RT8203GA is also widely used in Industrial control systems and Automotive systems.Working PrincipleTo understand the working principle of RT8203GA, we must first understand what Constant On-Time (COT) control is. COT control is an alternative to the well-known pulse generator based voltage-mode control. In COT control, the on-time of the controller is kept constant regardless of input or output voltage. When the input or output voltage changes, a compensating mechanism is activated to vary the frequency so that the average output voltage is maintained.At any moment, the RT8203GA checks the input voltage and determines the compensation factor to control the output voltage. When the input voltage drops, the compensating factor will increase, making the output voltage drop. When the input voltage rises, it will decrease the compensating factor, resulting in a higher output voltage.Another key feature of the RT8203GA is the low quiescent current. This device can operate at a much lower quiescent current than conventional voltage-mode control, making it more suitable for applications with limited power.ConclusionRT8203GA is a high performance DC-DC switch controller with current mode operation. It provides Constant On-Time (COT) control in 1S, 2S, and 3S configurations. It ensures an accurate valley current protection for current-mode control and low EMI for universal voltage input applications. RT8203GA is well-suited for applications such as battery chargers, DC/DC converters, and adapters for notebooks, tablet PCs, mobile phones, various consumer electronics, Industrial control systems and Automotive systems. All of these applications benefit from the low quiescent current, high accuracy and consistent performance of the RT8203GA.

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