LTC4126EV#TRMPBF

LTC4126 is a low-power wireless single-cell Li-Ion battery charger with an integrated step-down DC/DC regulator. The step-down regulator is a low-noise multi-mode charge pump which is powered from the battery and provides a regulated 1.2V at the output. The switching frequency is set to either 50KHz or 75KHz depending on the mode to keep any switching noise out of the audible range. This device charger is a full-featured constant-current constant-voltage Li-Ion battery charger with automatic recharge, automatic termination by safety timer, and battery temperature monitoring via an NTC pin. Charge current is fixed at 7.5mA with a 6-hour termination timer. Undervoltage protection disconnects the battery from all loads when the battery voltage is below 3V. It is widely used in application such as hearing aids, low power Li-Ion powered devices, wireless headsets, IoT wearables etc.

• Wideband Rx frequency: DC to <gt/>10MHz
• Integrated rectifier with overvoltage limit
• Pin selectable charge voltage is 4.2V or 4.35V
• VCC quiescent current is 50µA typ at (charging done, DC/DC off, VNTC <gt/> VDIS, TA = 25°C)
• Input voltage range is 2.7V to 5.5V
• NTC pin for temperature qualified charging
• DC/DC regulated output is 1.2V, DC/DC output current upto 60mA
• Pushbutton and/or digital on/off control for DC/DC
• DC/DC switching frequency is 50KHz typ at (3:1 mode, VBAT <gt/> VLOBAT2)
• Operating temperature is -20°C to 85°C, package style is 12-lead LQFN

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