MAX1873SEEE+T

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
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)
Package / Case:	16-SSOP (0.154", 3.90mm Width)
Supplier Device Package:	16-QSOP
Base Part Number:	MAX1873

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Introduction to MAX1873SEEE+T

The MAX1873SEEE+T is a Power Management Integrated Circuit (PMIC) that provides a complete, dual-channel battery charging solution, featuring cell balancing and all necessary power management functions.

Features & Benefits

The MAX1873SEEE+T integrates all necessary devices and functions required for powering, charging, and managing a battery in a single, cost-effective package. It supports two active cell-balancing/charging channels and provides essential battery diagnostics, including open/short/overvoltage detection. It also features an adjustable 3-level Current Limit, which allows the device to be used with a wide range of battery designs. In addition, the MAX1873SEEE+T includes onboard Supervisory and Enable Inputs, as well as a status output for active cell-balancing feedback.

Typical Applications

The MAX1873SEEE+T is ideal for powering and charging Li-Ion/Li-Polymer/LiFePO4 batteries in a variety of portable applications, such as smartphones, tablets, and personal navigation devices. It can also be used as a drop-in charger for such widely used communication protocols and transports as USB, RS232, CAN, and Ethernet.

Battery Charger Working Principle

The MAX1873SEEE+T utilizes a standard three-stage charging algorithm incorporating a pre-conditioning, constant-current, and constant-voltage phase. During the pre-conditioning phase, the device initiates charging and applies a small, user-defined current to precondition a weakened battery. The constant-current phase follows, during which the device applies the main charge to bring the battery up to a user-defined voltage set-point. The device slowly adjusts the charging current to maintain a safe and consistent current feed-rate. This ensures that the battery is charged with the least amount of time and risk to the battery’s longevity. Finally, the constant-voltage phase occurs. At this stage, the battery is almost fully charged, and the device enters a maintenance mode. The device maintains the battery’s voltage near the set-point and adjusts the current feed-rate as the battery approaches full charge. Once the battery is full, the device switches to a standby mode until current is required again.

Conclusion

The MAX1873SEEE+T from Maxim Integrated is a complete, dual-channel battery charging solution designed to power, charge, and manage a battery. Its features include cell balancing and essential battery diagnostics, enabling it to be used in a variety of portable applications. Its standard three-stage charging algorithm ensures the safety and longevity of the battery.

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