 | Author | Message | < Power Electronic ~ Switch-mode lithium-ion battery charger | | eric | | Posted: Thu Oct 05, 2006 2:27 am Post subject: Switch-mode lithium-ion battery charger | | | | Site Admin Joined: 01 Jan 1970 Posts: 311 | A Maxim application
More and more lithium-ion batteries are being used in all kinds of
appliances. These require a battery charger and for this Maxim’s
MAX745 is ideal. It provides all the functions necessary for charging
such batteries or packs of them. It provides a regulated charging
current of up to 4 A without getting hot, and a regulated voltage
with a total error at the battery terminals of only ±0.75%. It
uses low-cost, 1% resistors to set the output voltage, and a lowcost
n-channel MOSFET as the power switch.
The MAX745 regulates the voltage set point and charging current
using two loops that work together to transition smoothly
between voltage and current regulation. The per-cell battery voltage
regulation limit is set between 4.0 V and 4.4 V using standard
1% resistors, and then the number of cells is set from 1 to 4 by pinstrapping.
The total output voltage error is less than ±0.75%.
The charger is available as an evaluation kit, which is an assembled
and tested printed-circuit board that implements a step-down,
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