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40V 400mA Synchronous Step-Down Battery Charger
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LTC4121/LTC4121-4.2
40V 400mA Synchronous
Step-Down Battery Charger
FEATURES DESCRIPTION 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 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. This technique maintains maximum
power transfer with high impedance input sources such
as solar panels. nn APPLICATIONS
Handheld Instruments
Solar Powered Devices
nn Industrial/Military Sensors and Devices …
