NCP81233MNTXG

Voltage - Supply (Vcc/Vdd):	4.5 V ~ 20 V
Supplier Device Package:	52-QFN (6x6)
Package / Case:	52-VFQFN Exposed Pad
Operating Temperature:	-40°C ~ 100°C (TA)
Control Features:	Current Limit, Enable, Frequency Control, On Time Control, Ramp, Soft Start
Serial Interfaces:	I²C
Clock Sync:	Yes
Synchronous Rectifier:	--
Duty Cycle (Max):	--
Frequency - Switching:	200kHz ~ 1.2MHz
Series:	--
Output Phases:	4
Number of Outputs:	1
Topology:	Buck, Boost
Output Configuration:	Positive
Function:	Step-Up, Step-Down
Output Type:	PWM Signal
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

The NCP81233MNTXG is a third generation DC/DC synchronous step down controller designed and manufactured by ON Semiconductor, a world leader in power semiconductor and analog integrated circuit technology. NCP81233MNTXG mainly operates in system standby power supplies and is an ideal choice for industrial grade, mobile telecommunication and computing applications.

Application Field

NCP81233MNTXG is a high current DC-DC synchronous converter module with a wide variety of useful features and parametric performance. With its extremelu efficient power delivery and precisely tuned operation, this controller can support a wide range of AC and DC input load currents from 0.5A to 3A. Its power efficiency reaches up to 95% with its step-down capability from 6.5V to 0.8V, enabling a wide variety of mobile, computing and other applications.

Features

The NCP81233MNTXG is highly integrated to save design time, cost and space. It is a single chip solution which contains a voltage regulator, oscillator, logic and drivers. All of the necessary components are integrated into one package, resulting in a simple solution that drastically reduces development costs, board space and complexity. Key features include:•Low operating current: The NCP81233MNTXG offers extremely low operating current of just 2mA. This is ideal for battery-powered applications, as it helps to prolong battery life.•Programmable frequency: The NCP81233MNTXG allows for programmable frequency from 200kHz to 1MHz. This allows for efficient use of energy, by achieving high efficiency over a wide range of load current. •Built-in soft start feature: This feature allows the output to ramp up smoothly from 0mA to the desired current, preventing inrush current from affecting output accuracy and stability. •Over current protection: An integrated comparator compares the output voltage and current to a user-defined threshold, to provide over current protection.

Working Principle

The NCP81233MNTXG uses synchronous rectification to convert a DC or AC input voltage to a regulated DC output voltage. It consists of an oscillator, a logic module, logic drivers and high current MOSFETs. The oscillator produces the necessary clock signals that control the logic module and logic drivers, which in turn control the MOSFETs.The input voltage is applied across two MOSFETs operating in a synchronous manner. During the on-time of the switching cycle one MOSFET is turned on and the other is turned off. This allows the input voltage to be stepped down, as the current flows from the input terminals to the output terminals. The duty cycle of the MOSFETs can be adjusted by the logic module and logic drivers, which control the on-time and off-time of the MOSFETs. This results in a regulated output voltage that is proportional to the duty cycle.

Conclusion

The NCP81233MNTXG is a highly integrated DC/DC synchronous step down controller designed and manufactured by ON Semiconductor. It is ideal for applications that require low operating current and high efficiency, as it can support a wide range of input voltages and current loads. It is also a cost-effective solution, as it contains a wide range of components which are all integrated into one chip. The NCP81233MNTXG uses synchronous rectification to convert an AC or DC input voltage to a regulated DC output voltage, while featuring built in soft start and over current protection features.

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