uModule battery chargers with active current limit deliver 2-A from up to 32-VIN
October 04, 2010 // Paul Buckley
Linear Technology has unveiled the LTM8061 and LTM8062, the first devices in a new family of complete system-in-a-package uModule chargers, supporting an output charge current up to 2 A.
Both parts provide a complete, efficient 1 MHz switching step-down charger solution with as few as just one input capacitor. The LTM8061 features active input-current management to protect against supply rail droop, while providing maximum charge current to the load. The LTM8062 actively manages the output charge current to maximize the power sourced from a solar cell following Maximum Peak Power Tracking (MPPT) principles. The LTM8061 and LTM8062 operate from an input voltage range of 4.95V to 32 V with support for preconditioning, constant-current and constant-voltage mode operation. A 0.5% and 0.75% accurate float voltage respectively ensures maximum energy storage at charge termination set by a minimum current threshold detection or adjustable internal timeout.
The LTM8061 is specifically targeted for charging Li-Ion or Li-polymer batteries with float voltages of 4.1 V, 4.2 V, 8.2 V and 8.4 V. An externally adjustable float voltage allows the LTM8062 to support charging of single-and multi-cell Li-Ion, Li-polymer, Lithium iron phosphate (LiFePO4) and sealed lead acid (SLA) batteries up to 14.4 V.
To maintain the battery at full charge, the LTM8061 and LTM8062 automatically initiate a recharge cycle once the battery voltage drops to 2.5% below the float voltage. Safety features include bad-battery detection and NTC resistor input with fault indicator suitable for use with a LED. An internal input reverse voltage blocking diode is available to prevent leakage current from the battery when the power source is not present.
Packaged in a RoHS compliant 9 mm x 15 mm x 4.32 mm LGA package, pricing for the LTM8061 and LTM8062 starts at 8.85 US Dollars each and 9.85 US Dollars each, respectively in 1,000-piece quantities.
More information about the the LTM8061 and LTM8062 at www.linear.com/8061 and www.linear.com/8062
Visit Linear Technology at www.linear.com
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