Linear Technology
Corp.'s LTC4071 is a tiny shunt battery
system for Li-Ion/Polymer batteries that integrates a charger and battery pack
protection in one IC. The LTC4071, with its 550nA operating current, charges
and protects batteries from previously unusable very low current, intermittent
or continuous charging sources. The LTC4071 can charge at currents up to 50mA.
A near zero current (<0.1nA) low battery latching disconnect function
protects even low capacity batteries from deep discharge and potentially
irreparable damage. LTC4071 is housed in a low
profile (0.75 mm) 8-lead 2 x 3 mm DFN package. The device's feature set is
useful for high impedance, lower power charging source applications, such as
energy scavenging/harvesting, resistive isolation or solar-powered systems. It
can charge Li-Ion/Polymer, coin cell and thin film batteries.
With pin-selectable settings of 4.0, 4.1, or 4.2V, the LTC4071's 1 percent
accurate battery float voltage allows the user to optimize the balance between
battery capacity and lifetime. An independent high battery supervisory status
output indicates a near-fully charged battery. The internal thermal battery
conditioner reduces the float voltage to protect Li-Ion/Polymer cells at
elevated battery temperatures. Multiple-cell battery stacks can be charged and
balanced by configuring several LTC4071 ICs in series.
The LTC4071 is offered in an 8-lead MSOP package. The devices are rated for
operation from -40 to 125C. 1,000 piece quantity pricing is $2.20 and $2.30 for
the E grade in the DFN & MSOP packages respectively, and $2.53 and $2.65
for the I grade in DFN & MSOP respectively.
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