MAX17042G+T

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Packaging:	Tape & Reel (TR)
Part Status:	Active
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Base Part Number:	MAX17042

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Introduction

MAX17042G+T is an advanced battery management IC from Maxim Integrated, and it is ideal for applications requiring multi-cell battery monitoring and safety management. This integrated circuit (IC) combines multiple cores in a single package, including an analog-to-digital converter (ADC), two switch-mode charge pumps, a programmable current source, and a voltage detector. The MAX17042G+T is designed to provide all the functions needed to accurately monitor, charge, and protect multi-cell Li-ion, Li-polymer, and A123 (LiFePO4) batteries. This makes it highly suited to the range of applications for which battery monitoring and management is necessary.

Features and Benefits

The MAX17042G+T features comprehensive safety features, including over-voltage, over-current, under-voltage, thermal, and short-circuit protection. The integrated ADC provides up to 0.5% battery voltage accuracy and is capable of 25-bit resolution, while the charge pumps allow up to 1A of fast charging current, without the need for an external inductor. Other features of the MAX17042G+T include programmable charge current, low quiescent current, and low EMI radiation. The main benefits of the MAX17042G+T are its integrated protection, high-accuracy battery voltage monitoring, and fast charging. Its integrated protection ensures the safety of the battery and any external circuitry, while its highly accurate voltage monitoring provides a degree of battery diagnostics beyond that of other battery management ICs. The fast charging capabilities of the MAX17042G+T also make it suitable for applications with tight power constraints.

Applications and Installation

The MAX17042G+T is suitable for use in a wide range of applications which require multi-cell battery monitoring and management. These include electric vehicles, power tools, smart phones and tablets, electric bikes, wearable devices, and portable medical devices. The strong protection features make it well suited to applications with a high degree of safety requirements. The MAX17042G+T is installed by connecting the appropriate power (−IN, +IN), ground(VSS), and system supply(VCC) pins to the appropriate sources, and attaching external resistors as required to configure the current setting pins. The charge pump output pins are then connected to the battery in accordance with the supply voltage rating of the battery. An optional external temperature sensor can also be connected to the MAX17042G+T to enable further accuracy and control of the battery temperature.

Working Principle

The MAX17042G+T operates by monitoring the voltage of a multi-cell battery pack, and switching the charge pump on or off as required to maintain an appropriate level of charge. The integrated ADC measures the voltage of each cell in the battery pack and compares it to the programmed charge levels. If the voltage is below the threshold, the charge pump will switch on, sending a current through the corresponding cell and charging its voltage up to the desired level. Conversely, if the voltage of a cell is over the threshold, the charge pump will switch to a low power-consumption mode, allowing the battery to charge slowly in a trickle or “float” state. The integrated voltage guard detects and immediately switches off the charge pump in the event of an over-voltage or short-circuit. The temperature guard monitors the battery temperature and prevents the charge pump from switching on if the temperature rises above a predefined high-temperature level.

Conclusion

The MAX17042G+T is a versatile and reliable battery management IC from Maxim Integrated. It combines multiple cores in a single package and is suited to a wide range of applications requiring multi-cell battery monitoring and safety management. Its integrated protection and high-accuracy ADC provides a degree of monitoring beyond that of other battery management ICs, and its fast charge capabilities make it suitable for applications with tight power constraints.

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