ADP1878ACPZ-1.0-R7

Frequency - Switching:	1MHz
Base Part Number:	ADP1878
Supplier Device Package:	14-LFCSP-WD (4x3)
Package / Case:	14-WFDFN Exposed Pad, CSP
Operating Temperature:	-40°C ~ 125°C (TJ)
Control Features:	Enable, Power Good, Soft Start
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	45%
Series:	--
Voltage - Supply (Vcc/Vdd):	3.25 V ~ 20 V
Output Phases:	1
Number of Outputs:	1
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

The ADP1878ACPZ-1.0-R7 (ADP1878) offers a highly efficient, low power, 3-channel synchronous Buck switching controller and multiple power management features. It is ideal for applications, such as distributed power systems, industrial automation systems, medical electronics and automotive applications. This article discusses the application field and working principle of the ADP1878.

Application Field and Working Principle

Application Field

The ADP1878 is primarily targeted for applications requiring multiple low-power output sources, such as Industrial Automation, Medical Electronics and Automotive applications. It has a flexible power architecture, allowing voltage conversion from a wide input range (from␣4V to 40V or higher) to multiple low-voltage outputs. It is therefore an ideal solution for distributed power systems, enabling high-efficiency voltages conversion to meet the power consumption requirements of the connected load. As it is able to achieve high efficiency across a wide load range, it is suitable for low-power applications, such as distributed power systems, industrial automation systems, medical electronics, automotive applications and more.

Working Principle

The ADP1878 utilizes a 3-channel synchronous Buck converter to provide high-efficiency voltage conversion. It operates under a fixed frequency switching scheme, which minimizes the total harmonic distortion (THD) and reduces the noise level of the power system. The 3-channel synchronous Buck converter can be operated in two different modes:1) Current Share Mode: In this mode, each individual output is controlled by an independent Buck controller. The Buck controllers are shared among the different outputs, and the current through each output is divided among them. This allows for a more efficient operation and improved line and load regulation.2) Synchronous Mode: In this mode, all outputs are connected to the same Buck controller and are operated in parallel. This allows for a more efficient operation and improved line and load regulation.Additionally, the ADP1878 features two integrated MOSFET drivers and an adjustable over-current protection (OCP) feature which provides system protection against short-circuits and transient current spikes. The ADP1878 also has several advanced power management features, such as voltage sequencing, tracking, device enable/disable, thermal shut-down and remote sensing.

Conclusion

The ADP1878ACPZ-1.0-R7 is a highly efficient, low power, 3-channel synchronous Buck switching controller. It is designed to provide optimal power efficiency and protection in low-power applications such as distributed power systems, industrial automation systems, medical electronics and automotive applications. It operates under a fixed frequency switching scheme and has two modes of operation (current share and synchronous mode) which allows for improved line and load regulation. Additionally, the ADP1878 features two integrated MOSFET drivers and an adjustable over-current protection (OCP) feature which provides system protection against short-circuits and transient current spikes.

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