RT8237AZQW 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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RT8237AZQW is a high-performance, high-accuracy synchronous buck switching regulator controller. It integrates two independent MOSFET drivers that provides fast and accurate gate drive waveforms to the external power MOSFETs. This controller provides stable and reliable output voltage despite the variation of external components, such as input voltage and loading current. It also offers many protections and user-friendly features, such as adjustable soft-start, adjustable current limit, programmable over-current protection. Application FieldThe RT8237AZQW switching regulator controller is designed for a wide range of voltage regulation and power conversion applications. It is suitable for use in 12V/24V systems which demand high power conversion efficiency, low standby current, and high conversion accuracy. By leveraging the two independent MOSFET drivers, this regulator controller is ideal for applications in the field of power management where a single voltage output is needed in the range of 0.8V to 5.5V. A few examples of such applications are DVD/HDD players, laptop adapters, mobile phone chargers, smart phones, PDAs, and other consumer electronics that require regulated power supplies. Working PrincipleThe RT8237AZQW switching regulator controller operates by controlling the duty cycle of the external power MOSFETs. When an external MOSFET is on (in conduction), the input voltage is applied to the output node. When it is off (in cut-off), the output voltage is preserved by the series inductor and output capacitor. The output voltage is regulated by matching the on-time duration to the off-time duration of the external MOSFETs. The RT8237AZQW switching regulator controller provides two independent MOSFET drivers, each one can be used to control one external MOSFET (high side and low side). The operation of both high and low side MOSFETs can be controlled through one PWM signal, with several user-selectable switching frequency options and built-in PWM frequency dithering. This controller also features a programmable control loop and adjustable turn on/off logic to maintain stability and provide accurate output voltage regulation. When the load current changes, or the input voltage is changed, the RT8237AZQW controller will detect these signals, and adjust the duty cycle of the external power MOSFETs accordingly. In order to maintain a stable output voltage throughout the operating range, the RT8237AZQW is also equipped with adjustable over current protection and adjustable soft-start to ensure smooth operation during start-up. ConclusionThe RT8237AZQW switching regulator controller is a high-performance, high-accuracy synchronous buck voltage regulator that offers superior performance, power conversion efficiency, and high conversion accuracy. It is suitable for use in 12V/24V applications where high power conversion efficiency, low standby current, and high conversion accuracy is required. The controller provides two independent MOSFET drivers, adjustable over-current protection, adjustable soft-start, and user-selectable switching frequency options to ensure stable and reliable output voltage despite the variation in external components.

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