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LTC4121IUD#PBF

LTC4121IUD#PBF

Analog Devices
Battery Management 40V 400mA Sync Buck Bat Chr
NRND2,164 in stock
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Overview

The LTC4121IUD#PBF is a synchronous step-down battery charger designed to handle input voltages up to 40V and deliver up to 400mA of charge current. It features a maximum power point tracking (MPPT) function that optimizes power extraction from high-impedance sources like solar panels.

Why Choose This Part

The 40V input rating allows for direct connection to high-voltage supplies without pre-regulation, and the programmable float voltage accommodates various battery chemistries. Its internal synchronous switch architecture ensures high efficiency in a compact 4mm x 4mm QFN package.

Applications

Solar Powered Systems
Utilizes the integrated MPPT capability to maximize energy harvest from small photovoltaic panels under varying light conditions.
Industrial Remote Sensors
Charges Li-Ion, LiFePO4, or lead-acid batteries in remote monitoring stations using high-voltage industrial supply rails.
Energy Harvesting Systems
Acts as a power management interface for high-impedance transducers requiring efficient buck conversion to battery voltages.

Getting Started

Engineers should evaluate the LTC4121 using the DC2151A demonstration circuit to test MPPT performance and thermal behavior. Design requires selecting an external inductor and programming resistors for the MPPT setpoint and float voltage based on the target battery chemistry.