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LTC4126 - 7.5mA Wireless Li-Ion Charger

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General Description

The LTC®4126 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.

Overview

LTC4126 7.5mA Wireless Li-Ion Charger with 1.2V Step-Down DC/DC.

Key Features

  • n Wireless Li-Ion Battery Charger Plus High Efficiency Multi-Mode Charge Pump DC/DC n Wideband Rx Frequency: DC to >10MHz n Integrated Rectifier with Overvoltage Limit n Pin Selectable Charge Voltage: 4.2V or 4.35V n Charge Current: 7.5mA (Fixed) n Low Battery Disconnect: 3.0V n NTC Pin for Temperature Qualified Charging n DC/DC Regulated Output: 1.2V n DC/DC Output Current: Up to 60mA n 50kHz/75kHz Switching, No Audible Noise n Pushbutton and/or Digital on/off Control for DC/DC n Thermally Enha.

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