LTC4002ES8-4.2#TRPBF

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Battery Chemistry:	Lithium-Ion
Number of Cells:	1
Current - Charging:	Constant - Programmable
Programmable Features:	Timer
Fault Protection:	--
Charge Current - Max:	--
Battery Pack Voltage:	4.2V
Voltage - Supply (Max):	22V
Interface:	--
Operating Temperature:	-40°C ~ 85°C (TA)
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Supplier Device Package:	8-SOIC
Base Part Number:	LTC4002

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A PMIC - Battery charger plays a very important role in many sophisticated electronic applications. The LTC4002ES8-4.2#TRPBF is one such device that is used in a wide range of applications for charging Li-ion and LiD battery packs. This part is designed for applications that require high current charging of up to 4.2A. It utilizes an external P-channel MOSFET (Metal Oxide Semiconductor Field Effect Transistor) integrated with a MOSFET driver. In this article, we\'ll review the application field and working principle of this product.

Application Field:
The LTC4002ES8-4.2#TRPBF is utilized in a variety of portable electronic applications, including power tool batteries, digital cameras, portable audio players, and wearable medical devices. Its maximum output current of up to 4.2A ensures fast and safe charging of Li-ion and LiD battery packs. This device also offers over-voltage and over-temperature protection as required by certain applications.

Working Principle:
The LTC4002ES8-4.2#TRPBF operates with an external P-channel MOSFET and built-in MOSFET driver. The charge process begins when a voltage is applied to the IN terminal. This voltage must be at least 0.2V higher than the lower UVLO (Under Voltage Lock Out). The voltage from IN then triggers a current limit timer, eventually causing the MOSFET driver to turn on. This in turn allows current to flow from the BAT terminal, thus charging the Li-ion or LiD battery pack.The device utilizes two primary components for the charge current control. The first is the current sense resistor which limits the amount of current that can be drawn from the IN terminal. The second is the MOSFET gate which is adjusted by the voltage on the GATE terminal. By altering the voltage on the GATE terminal, the device can regulate the charging current during various stages of the charge cycle.Once the battery pack has been fully charged, the device will automatically enter a low current sleep mode, reducing power consumption. In this mode, the P-channel MOSFET is still on, but has been forced to a low on-resistance setting. During this low current sleep mode, the charge current is maintained at around 3mA to provide a “trickle” charge.When an over-voltage or over-temperature protection condition is detected, the device will actively switch off the P-channel MOSFET and go into standby mode. This safeguards the battery pack from potential damage.

In conclusion, the LTC4002ES8-4.2#TRPBF is a reliable and cost-effective battery charger suitable for a wide range of portable electronic applications. Its integrated P-channel MOSFET and MOSFET driver allows it to handle up to 4.2A of charging current while offering high levels of protection against over-voltage and over-temperature conditions.

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