RT8237CZQW Integrated Circuits (ICs)

Voltage - Supply (Vcc/Vdd):	4.5 V ~ 5.5 V
Supplier Device Package:	10-WDFN (3x3)
Package / Case:	10-WFDFN Exposed Pad
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Current Limit, Enable, Phase Control, Power Good
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	--
Frequency - Switching:	290kHz ~ 430kHz
Series:	--
Output Phases:	1
Number of Outputs:	1
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Discontinued at Digi-Key
Packaging:	Tape & Reel (TR)

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RT8237CZQW Application Field and Working Principle

The RT8237CZQW is an LDO (Low Dropout Voltage Regulator) type DC-DC switching controller for notebooks and other mobile devices. Designed for high efficiency applications, it can operate from an input between 4V to 16V, and supply output voltages of 0.8V to 5.25V.At the heart of the RT8237CZQW is an advanced high-voltage switch mode DC to DC buck-boost converter which controls the output stage. It has built-in current limit and fixed frequency oscillator, multiple voltage control methods and a smooth transition from PWM to PFM operating mode.The RT8237CZQW is configured through a PMBus or I2C interface, which is highly configurable. The controller can be set up for both synchronous and asynchronous operations, enabling high-efficiency switching for either step up/down or single-ended/push-pull operation. With an integrated short-circuit protection and built-in UnderVoltage Lockout (UVLO) circuit, the device can guarantee a safe operation. It also supports both bootstrap and PWM/MOSFET driving capabilities.The RT8237CZQW is suitable for a range of application such as notebook, graphics cards, and tablet charger power supplies. It is designed to meet the requirements of the IT equipment industry, offering high efficiency, low noise and small size.In addition to its DC-DC switching applications, the RT8237CZQW can also be used as an active clamp low ESR (Equivalent Series Resistance) LDO regulator. This function can be used to provide additional output ripple and cleaner power during heavy load conditions.The following sections will explain the details of the RT8237CZQW’s application field and working principle in greater detail.

Application Field

The RT8237CZQW is a DC-DC buck-boost controller that can supply up to 5.25V from a 4V to 16V input. It is suitable for applications such as notebook charger power supplies, graphics cards, and tablet charger supplies. It offers a high efficiency of up to 96% and a low-EMI (electromagnetic interference) operation with ultra-low switching noise.The device supports multiple voltage control methods and active-clamp LDO regulators, enabling high-efficiency switching for either step up/down or single-ended/push-pull operations. It is designed to meet the requirements of the IT equipment industry, offering high efficiency and small size.

Working Principle

The RT8237CZQW is a high voltage switch-mode DC to DC buck-boost converter, which controls the output stage. It uses a high performance Advanced PMOS (A-PMOS) technology that reduces on-resistance, increases switch-on time, and ensures the operation of the device at high switching frequency.The controller features a fixed frequency oscillator, current limit and multiple voltage control methods. It also has an integrated high-side bootstrap, a soft-start circuit, a voltage correction circuit and a thermal shutdown circuit which prevents the internal components from being damaged by high temperature.The device has an independent low-voltage loop and an adjustable current limit maximum duty cycle setting which makes it suitable for low voltage applications. It also has an integrated VPEAK and VMIN load line comparators to provide protection against excessive output voltage and load line excursion respectively.In addition, the RT8237CZQW supports both PWM and MOSFET modes of operation, allowing it to be used in synchronous and asynchronous applications. With an integrated short-circuit protection and built-in UVLO circuit, it can guarantee a safe operation.

Conclusion

The RT8237CZQW is a LDO type DC-DC switching controller for notebooks and other mobile devices. It has an advanced high-voltage switch mode DC to DC buck-boost converter and can operate from an input of 4V to 16V, providing output voltages of up to 5.25V. Additionally, it has an advanced A-PMOS technology which helps to increase efficiency, as well as current limit and fixed frequency oscillator capabilities which ensure a smooth and reliable operation. Furthermore, it supports both PWM and MOSFET modes of operation, and has integrated protection circuits.

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