MAX8903JETI+

Series:	Smart Power Selector™
Packaging:	Tube
Part Status:	Active
Battery Chemistry:	Lithium-Ion
Number of Cells:	1
Current - Charging:	Constant - Programmable
Programmable Features:	Current, Timer
Fault Protection:	Over Voltage
Charge Current - Max:	2A
Battery Pack Voltage:	4.35V
Voltage - Supply (Max):	16V
Interface:	USB
Operating Temperature:	-40°C ~ 85°C (TA)
Package / Case:	28-WFQFN Exposed Pad
Supplier Device Package:	28-TQFN (4x4)
Base Part Number:	MAX8903

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Application field and Working Principle of MAX8903JETI+

PMIC - Battery ChargersBattery chargers are widely used in modern electronic devices. Many electronic products contain battery chargers, especially portable electronic products such as mobile phones and digital cameras. The MAX8903JETI+ battery charger is one of the most popular solutions for charging Li-ion and Li-polymer batteries. In this article, we will discuss the application field and working principle of the MAX8903JETI+ battery charger. The MAX8903JETI+ is a highly integrated single-cell battery charger designed for portable applications. It features a 200-mA maximum output charge current, low-cost and small-size packaging. In addition, it offers a high efficiency PWM-mode operation, adjustable voltage and current, and reverse-current protection. This makes it the ideal solution for Li-ion and Li-polymer battery charging applications in portable electronic devices. The MAX8903JETI+ can operate in either constant-current (CC) or constant-voltage (CV) mode. It has adjustable CC/CV regulation levels and a programmable charge-end current threshold. In addition, it features a three-level charge algorithm that provides efficient charging while minimizing overcharging of the battery. It also incorporates a timer-based charge cycle that terminates the charge if it takes longer than the pre-programmed time. The working principle of the MAX8903JETI+ is simple. During the CC mode, a current is supplied to the battery, depending on the CC regulation level. This level is fixed until the battery voltage reaches the CV regulation level. If the battery voltage reaches the CV regulation level while the current is still high, the charge cycle is terminated and the charging process stops. Once the battery is fully charged, the MAX8903JETI+ turns off the charge circuit and enters the standby mode. When the battery voltage decreases, it re-enters the CC mode and once again supplies the battery with a current, depending on the predetermined CC regulation level. Meanwhile, the timer-based charge cycle keeps track of the amount of time and automatically terminates the charging process if it takes longer than allowed. Overall, the MAX8903JETI+ is a reliable and efficient battery charger for Li-ion and Li-polymer batteries. Its highly integrated solution, adjustable voltage and current settings, and reverse-current protection make it a great solution for portable electronics devices. In addition, its timer-based charge cycle and three-level charge algorithm maximize the charging efficiency and minimize overcharging of the battery.

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