Texas Instruments LM3420AM5-4.2

Contains Lead RoHS Compliant INDUSTRIAL GULL WING IC (Function) 85C 1.6mm 4.242V
IC BATT CNTL LI-ION 1CEL SOT23-5
IC CTRLR LIION BAT CHRG SOT23-5
The LM3420 series of controllers are monolithic integrated circuits designed for charging and end-of-charge control for Lithium-Ion rechargeable batteries. The LM3420 is available in five fixed voltage versions for one through four cell charger applications (4.2V, 8.2V/8.4V, 12.6V and 16.8V respectively). Included in a very small package is an (internally compensated) op amp, a band gap reference, an NPN output transistor, and voltage setting resistors. The amplifier's inverting input is externally accessible for loop frequency compensation. The output is an open-emitter NPN transistor capable of driving up to 15 mA of output current into external circuitry. A trimmed precision band gap reference utilizes temperature drift curvature correction for excellent voltage stability over the operating temperature range. Available with an initial tolerance of 0.5% for the A grade version, and 1% for the standard version, the LM3420 allows for precision end-of charge control for Lithium-Ion rechargeable batteries. The LM3420 is available in a sub-miniature 5-lead SOT23-5 surface mount package thus allowing very compact designs.