CS51033YD8G

Frequency - Switching:	200kHz
Base Part Number:	CS51033
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Frequency Control, Soft Start
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	No
Duty Cycle (Max):	83.3%
Series:	--
Voltage - Supply (Vcc/Vdd):	3 V ~ 16 V
Output Phases:	1
Number of Outputs:	1
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Obsolete
Packaging:	Tube

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CS51033YD8G Application Field and Working Principle

Introduction

The CS51033YD8G (or simply CS51033) is a low voltage DC/DC buck controller designed by Cypress Semiconductor Corporation. It is part of their SmartSync product line and is used mainly for automotive applications. It is targeted for microcontrollers and moderate-to-high voltage DC/DC buck applications. It is designed to directly provide 3V[1] power to automotive microprocessors, as well as to simplify the process of integrating DC/DC buck converters with microcontrollers.

Application Field

The CS51033YD8G is mainly used for automotive applications. It is capable of providing 3V power, and it is ideal for a wide range of embedded applications, including in-car systems, multimedia systems, LED lighting and displays, and instrument clusters. It is also suitable for a variety of industrial, communications, and medical systems, such as Power over Ethernet (PoE) applications and battery operated devices.

Features and Benefits

The CS51033YD8G offers a variety of features and benefits that make it the ideal choice for automotive applications. It has an integrated, highly accurate, low-power reference voltage; a high frequency, synchronous rectification output stage; an adjustable output voltage range of 0.8V to 3.3V; and selectable input current limit and short-circuit protection. It also provides frequency synchronization of up to 500kHz, as well as a fast switching transient response that reduces EMI/RFI. Additionally, the device is capable of delivering up to 12A continuous output current while providing excellent efficiency and low-profile packaging.

Pinouts and Functions

The CS51033YD8G has an 8-pin SOIC package and two separate ground pins. The pinout is as follows: VIN (input voltage), VCC (controller supply voltage), VD (output voltage command), RT (resistor voltage bias for output current limiting/short-circuit protection), BOOT (bootstrap voltage for the high-side FET driver), PG (power ground), FB (feedback from output voltage regulation), PGND (bulk ground).

Working Principle

The CS51033YD8G is a synchronous buck switching controller that utilizes a high-frequency, synchronous FET rectification topology to convert an input voltage into a regulated output voltage. The device operates by regulating the output voltage based on a feedback signal from the output voltage divider. The device can operate at a switching frequency of up to 500kHz and has an adjustable output voltage range of 0.8V to 3.3V.When the device is powered up, the output voltage ramp up slowly until it reaches the desired output voltage. During the normal operating mode, the CS51033YD8G evaluates the output voltage and adjusts the duty cycle of the output FETs accordingly to regulate the desired voltage. The output current is regulated by the over current protection circuit and the output current limit (OCL) pin. The OCL pin is connected to an external voltage divider, which sets the current limit threshold. When a short circuit or over current event occurs, the CS51033YD8G will reduce the duty cycle for the output FETs until the fault is removed. This protects the device from overheating and possible damage.

Conclusion

In conclusion, the CS51033YD8G is a low voltage DC/DC buck controller designed by Cypress Semiconductor Corporation. It is used mainly for automotive applications and provides a variety of features and benefits. It is capable of providing 3V power and has an adjustable output voltage range of 0.8V to 3.3V. It is suitable for a variety of embedded, industrial, communications and medical systems. The working principle of the CS51033YD8G is based on a high-frequency, synchronous FET rectification topology and is capable of providing excellent efficiency and low-profile packaging.

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