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LTC4121 - 40V 400mA Synchronous Step-Down Battery Charger

General Description

The LTC®4121 is a 400mA constant-current/constantvoltage (CC/CV) synchronous step-down battery charger.

In addition to CC/CV operation, the LTC4121 regulates its input voltage to a programmable percentage of the input open-circuit voltage.

Key Features

  • nn Wide Input Voltage Range: 4.4V to 40V nn Temperature Compensated Input Voltage Regulation for Maximum Power Point Tracking (MPPT) nn Adjustable Float Voltage 3.5V to 18V (LTC4121) nn Fixed 4.2V Float Voltage Option (LTC4121-4.2) nn High Efficiency: Up to 95% nn 50mA to 400mA Programmable Charge Current nn ±1% Feedback Voltage Accuracy nn Programmable 5% Accurate Charge Current nn Thermally Enhanced, Low Profile (0.75mm) 16-Lead (3mm × 3mm) QFN Package.

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Other Datasheets by Linear Technology (now Analog Devices)

Part Number Description
LTC4121-4.2 40V 400mA Synchronous Step-Down Battery Charger
LTC4120 Wireless Power Receiver and 400mA Buck Battery Charger
LTC4120-4.2 Wireless Power Receiver and 400mA Buck Battery Charger
LTC4125 5W AutoResonant Wireless Power Transmitter
LTC4100 Smart Battery Charger Controller

Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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LTC4121/LTC4121-4.2 40V 400mA Synchronous Step-Down Battery Charger FEATURES nn Wide Input Voltage Range: 4.4V to 40V nn Temperature Compensated Input Voltage Regulation for Maximum Power Point Tracking (MPPT) nn Adjustable Float Voltage 3.5V to 18V (LTC4121) nn Fixed 4.2V Float Voltage Option (LTC4121-4.2) nn High Efficiency: Up to 95% nn 50mA to 400mA Programmable Charge Current nn ±1% Feedback Voltage Accuracy nn Programmable 5% Accurate Charge Current nn Thermally Enhanced, Low Profile (0.75mm) 16-Lead (3mm × 3mm) QFN Package APPLICATIONS nn Handheld Instruments nn Solar Powered Devices nn Industrial/Military Sensors and Devices L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks of Linear Technology Corporation.