With the MAX8804Y/MAX8804Z, Maxim has released what it claims are the industry's smallest, fully integrated, dual-input, standalone, USB/AC-adapter chargers for 1-cell lithium-ion (Li+) batteries. Capable of shutting off an input voltage higher than 7,5 V, as well as withstanding a 30 V d.c. or 16 V USB input, the MAX8804Y/MAX8804Z protect against loosely regulated power sources. Requiring only 6 mm² of board space, these chargers also integrate proprietary thermal regulation and constant-current, constant-voltage (CCCV) circuitry to eliminate overheating during fast charging and simplify hardware design.
In a tiny 2 mm x 3 mm footprint, the MAX8804Y/MAX8804Z feature intelligent USB/DC-input circuitry that automatically selects between either a USB or AC-adapter input source. Additionally, each charger integrates two high-voltage, low-Rds(on) charging FETs, a reverse-current-blocking diode, a current-sensing resistor and input over-voltage-protection (OVP) circuitry. To further ensure high performance, they feature a flexible single-wire interface that enables programming of the charge-current level, they deliver up to 700 mA of fast-charging current, and they offer a low 2 μA battery-leakage current when no input current is supplied.
The main difference between these devices is that they utilise different charging sequences: before initiating fast charging, the MAX8804Z utilises a prequalification charging stage to bring the battery voltage to 2,5 V, whereas the MAX8804Y starts fast-charging without a pre-charging stage.
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