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Base Part Number:	SCY99090
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SCY99090SNT1G Application Field and Working Principle

Introduction to DC DC Switching Regulators

DC-DC switching regulators are used in a wide variety of commercial, industrial, and consumer electronics applications. They are used to convert a fixed input voltage to a desired output voltage. These regulators provide a high-efficiency solution to up or down converting voltage levels and are used in most portable electronic applications, including cell phones and other mobile devices.When it comes to choosing the right DC-DC regulator, there are several parameters that must be considered. These include the output power requirement, input and output voltage range requirements, switching frequency, output ripple requirements, and external components required.

SCY99090SNT1G Overview

The SCY99090SNT1G is a high-efficiency, 10-25V*, 1A DC-DC synchronous buck regulator IC from NXP® Semiconductors. The IC is designed to meet the Light Load Effciency Requirements for Portables and Industrial Embedded Systems and to improve system efficiency by reducing component count and board space, and simplifying board layout.The SCY99090SNT1G is available in a low-profile QFN-16 (4x4) package. The IC provides a range of adjustable output voltages, from 0.9V to 5.5V. It is a pin-for-pin replacement for the SCY99090 device featuring the same core functionality, however additional features have been added, such as an internal compensation network, a low-side reset option, and integrated switch current limit protection.*Input voltage range limit of 25V is limited only by the External components used.

Features of the SCY99090SNT1G

The SCY99090SNT1G offers a range of benefits, such as:• 3MHz Switching Frequency: The IC operates at a switching frequency of 3MHz, eliminating the need for an external clock in most cases. This allows for a smaller and simpler board layout.• High Efficiency: The SCY99090SNT1G has an efficiency of 95 percent and will reduce power losses and cut system cost.• Output Voltage Accuracy: The output voltage is adjustable from 0.9V to 5.5V with 0.1V programmable resolution, and accuracy of 12mV at light load.• Low Output Voltage Ripple: The device has low output voltage ripple, typically <10mV.• Thermal Shutdown and Over-Current Protection: The IC will automatically disable its output and limit current if the junction temperature reaches its preset thermal shutdown temperature. An over-current protection protects the IC from peak currents exceeding its maximum rating.• Low Operating Input Voltage: The device can operate from an input voltage as low as 4V, enabling it to be used in low-voltage systems.• Enable/Disable Input: A logic-level enable control is provided for the converter, enabling it to be turned on or off.• Pin Compatible Upgrade: The SCY99090SNT1G device is a pin compatible upgrade to the SCY99090 device, featuring the same core functionality, however additional features have been added.

Applications of the SCY99090SNT1G

The SCY99090SNT1G is suitable for a wide range of applications, such as:• Computing and Communications: The device can be used in computing and communication systems, such as servers, laptops, and smartphones. It can also be used in the power supply designs.• Test and Measurement: The SCY99090SNT1G can be used in automated test and measurement equipment, such as instruments, meters, and detectors.• Industrial: The IC can also be used in industrial control applications, such as motor drives and load testers.• Automotive: The device can be used in automotive electronics applications.

Working Principle of the SCY99090SNT1G

The core of this device is a voltage regulator. It consists of two parts: the controller and the power switch. The controller senses the input voltage, regulates it, and supervises the power switch to ensure that the required output voltage is maintained over the full range of temperatures and varying load conditions.The power switch is a power Mosfet that is controlled by the controller. The power switch operates in two distinct modes, either by pulse width modulation (PWM) or by pulse frequency modulation (PFM). In the PWM mode, the switch is switched on and off rapidly at a fixed frequency; when the power switch is in the PFM mode, the frequency of the pulse changes as the load conditions change.To maintain the desired output voltage, the power switch is operated for a certain percentage of the time in the PWM mode, and the output voltage is determined by the duty cycle of the power switch. The duty cycle is in turn determined by the output voltage demands. As the output voltage demands change, the duty cycle is automatically adjusted so that the desired output voltage is maintained.In summary, the SCY99090SNT1G is a high-efficiency, 10-25V*, 1A DC-DC synchronous buck regulator IC from NXP® Semiconductors. It is a pin-for-pin replacement for the SCY99090 device, featuring additional features such as an internal compensation network, a low-side reset option, integrated switch current limit protection, and a 3MHz switching frequency, saving component count and board space. The IC has a 95 percent efficiency and a low output voltage ripple of <10mV. It is suitable for a wide range of applications, including computing and communications, test and measurement, industrial, and automotive.

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