MAX1873SEEE

Series:	--
Part Status:	Obsolete
Battery Chemistry:	Multi-Chemistry
Number of Cells:	3
Current - Charging:	Constant - Programmable
Programmable Features:	--
Fault Protection:	--
Charge Current - Max:	4A
Battery Pack Voltage:	12.6V
Voltage - Supply (Max):	28V
Interface:	--
Operating Temperature:	-40°C ~ 85°C (TA)

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Introduction

The MAX1873SEEE is a power management integrated circuit (PMIC) designed by Maxim Integrated designed for battery charging applications. It is a highly integrated solution featuring the industry’s highest peak current and charge progress monitoring accuracy, plus an accurate temperature monitor with pre-charge and trickle charging capability. Equipped with advanced comparators and dedicated fault protection pins, it meets all necessary safety standards. In this article, we will discuss the application fields and working principle of the MAX1873SEEE.

Application Fields

The MAX1873SEEE is mainly used as a battery charger in mobile devices such as cell phones and tablets, as well as portable electronics and other battery-powered products. It is also suitable for charging single cell Li-Polymer and Li-Ion battery packs with up to four cells. This IC is an excellent choice for newer battery types, such as those that feature higher rates of charge and discharge, because of the high current accuracy feature of the device, which allows for extremely fast and efficient charging of batteries.

Features

The MAX1873SEEE has a wide range of features that make it an ideal choice for battery charging applications. It includes an adjustable switching frequency, up to 4.1A of peak current and can support both Li-Ion and Li-Polymer chemistries. It also has an adjustable current limit and voltage regulation, input overvoltage protection, and a timer register to control the charge time. The IC also has an internal temperature monitor that allows for charging with pre-charge and trickle charging cycles. It also features two pulse-width modulation (PWM) outputs, one for controlling the charger’s current limit and another for controlling the charger’s voltage regulation.

Working Principle

The MAX1873SEEE operates on the principle of voltage regulation, whereby the voltage across the battery is regulated so it can receive a constant flow of current while it is being charged. This is achieved by measuring the voltage across the battery and then adjusting the current to the correct value. Once the voltage reaches the correct level, the IC switches to a constant voltage mode, where the voltage is maintained without the need for adjustment. When the battery is full, the IC will switch to a trickle charge mode, where it will reduce the output current to prevent overcharge of the battery. The MAX1873SEEE also has active protection circuits that protect against common fault conditions such as overvoltage, short circuit and overtemperature. These protection circuits are programmed through the fault protection terminals and can be triggered by external signals, as well as internal safety criteria.

Conclusion

The MAX1873SEEE is a highly integrated power management integrated circuit (PMIC) designed for battery charging applications. It features the industry’s highest peak current and charge progress monitoring accuracy and the ability to directly control the current and voltage of a single battery cell for fast and efficient charging. The MAX1873SEEE also features advanced comparators and dedicated fault protection pins, designed to meet all necessary safety standards. Its versatile feature set makes it ideal for a variety of battery charging applications.

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