Linear Technology Corp. introduced the LT3652HV, a higher voltage
version of the innovative LT3652 monolithic buck battery charger for modern
battery chemistries. The LT3652HV offers a wider battery float voltage range
than the LT3652— up to 18V—and features the same input voltage regulation
loop that controls charge current to hold the input voltage at a programmed
level. The LT3652HV has the flexibility to charge many different battery
configurations from various input supplies, and when it is connected to a solar
panel, the input regulation loop maintains the panel at peak output power.
accepts a wide range of inputs from 4.95 to 34V with a 40V absolute maximum
rating for added system margin. The input voltage regulation loop also allows
optimized charging from poorly regulated sources where the input can collapse
under overcurrent conditions. It charges a variety of battery pack
configurations, including 1 to 4 Li-Ion / Polymer cells in series, 1 to 5
LiFePO4 (Lithium Iron Phosphate) cells in series and sealed lead
acid (SLA) batteries up to 18V. Applications include solar-powered systems, 12
to 24V automotive equipment and battery chargers.
LT3652HV's charge current is programmable up to 2A. This stand-alone battery
charger requires no external microcontroller and features user-selectable
termination, including C/10 or an onboard timer. The device's 1MHz fixed
switching frequency enables small solution sizes. Float voltage feedback
accuracy is specified at ±0.5 percent, charge current accuracy is ±5 percent
and C/10 detection accuracy is ±2.5 percent. Once charging is terminated, the
LT3652HV automatically enters a low current standby mode, which reduces the
input supply current to 85µA. In shutdown, the input bias current is reduced to
15µA. For autonomous charge control, an auto-recharge feature starts a new
charging cycle if the battery voltage falls 2.5 percent below the programmed
Pricing starts at $3.40 and $3.70 each, respectively in
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