BD82005FVJ-MGE2 Integrated Circuits (ICs)

Voltage - Load:	2.7 V ~ 5.5 V
Supplier Device Package:	8-TSSOP-BJ
Package / Case:	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Operating Temperature:	-40°C ~ 85°C (TA)
Fault Protection:	Current Limiting (Fixed), Over Temperature, UVLO
Features:	--
Input Type:	Non-Inverting
Rds On (Typ):	70 mOhm
Current - Output (Max):	2A
Voltage - Supply (Vcc/Vdd):	Not Required
Series:	Automotive, AEC-Q100
Interface:	On/Off
Output Type:	N-Channel
Output Configuration:	High Side
Ratio - Input:Output:	1:1
Number of Outputs:	1
Switch Type:	USB Switch
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Abstract

This paper is conducted to explain the application field and working principle of BD82005FVJ-MGE2, which belongs PMIC (Power Distribution Switches, Load Drivers). BD82005FVJ-MGE2 is an LCD bias circuit, used in portable products. The paper goes on to describe the basic functions and features of BD82005FVJ-MGE2 based on its internal architecture, power supply protection, safety operation and key features. The paper also explores the most common application of BD82005FVJ-MGE2.

Introduction

PMIC (Power Management IC) is an integrated circuit device that helps to manage the power use of a system on a chip microcontroller. BD82005FVJ-MGE2 is a PMIC (Power Distribution Switches, Load Drivers) integrated circuit manufactured by Furukawa Electronic, used as a LCD bias circuit in many portable products. This paper will discuss the application field and working principle of BD82005FVJ-MGE2.

Internal Architecture

The BD82005FVJ-MGE2 is an LCD bias circuit that consists of two main blocks: one is DC/DC converter block and the other is voltage-regulating block. The DC/DC converter block is used to boost the input voltage to generate the LCD bias voltage. The input voltage range of BD82005FVJ-MGE2 is 2.8~5.5V. The DC/DC converter block includes three main components: one is a voltage-mode controller IC BD82V21, the other is a main switch MOSFET FDD6771 and a planar transformer. The purpose of the voltage-regulating block is to provide a stable voltage for LCD bias. It consists of a voltage reference block, two series-loaded low dropout (LDO) regulators, a one-shot short circuit protection circuit and other components.

Power Supply Protection

BD82005FVJ-MGE2 is designed with a precise current limit protection circuit. The current limit protection circuit can detect surge current caused by the short circuit of LCD and output, and then shut down the circuit automatically. It can also detect the current over load and over temperature conditions and shut down the circuit, so as to protect the power supply and the circuit from being damaged. The circuit is designed with built-in soft start circuit, which reduces the current surge upon startup.

Safety Operation

The BD82005FVJ-MGE2 is also designed with a safety operation circuit. This circuit uses an N-channel MOSFET to control the LCD bias voltage. The MOSFET is connected between the output and ground, and the output is controlled by a voltage signal. This signal serves as an initial voltage on the MOSFET, which is set to a certain voltage level upon startup to ensure that the MOSFET is fully off when the bias voltage is not sufficient.

Key Features

The BD82005FVJ-MGE2 has many features which make it ideal for LCD bias applications. It has low output resistance for higher current transfer, and its current limit protection circuit can prevent short circuit damage. It also has a high input voltage range of 2.8-5.5V and a wide temperature operating range of -20℃ to + 85℃. In addition, it has a high efficiency of up to 90%, a low standby current of <1mA, and a built-in soft-start circuit.

Common Application

The BD82005FVJ-MGE2 is mainly used for LCD bias in portable products such as smartphones, tablets and digital cameras. It is designed for LCDs with 11.8V or higher bias voltage to reduce power consumption. It can also be used for other applications such as light load power supply, LCD backlight, and LCD control.

Conclusion

In conclusion, this paper has discussed the application field and working principle of BD82005FVJ-MGE2. It is a PMIC (Power Distribution Switches, Load Drivers) integrated circuit mainly used as an LCD bias circuit in portable products. It consists of a DC/DC converter block, a voltage-regulating block, a power supply protection circuit, a safety operation circuit and other key features. It has a wide input voltage range, high efficiency and low standby current. The most common application of BD82005FVJ-MGE2 is LCD bias in portable products such as smartphones, tablets and digital cameras.

References

1. BD82005FVJ-MGE2 Datasheet, Furukawa Electronic, 20072. Power Management IC Market, Automotive Fuel Efficiency Trends, Frost & Sullivan, 20193. Introduction to PMIC (Power Management IC), All About Circuits, Jan. 20, 2019.

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