LM3420-8.2

 Voltageoptionsforcharging1,2,3or4cells
TinySOT23-5package
Precision(0.5%)end-of-chargecontrol
Drivecapabilityforexternalpowerstage
Lowquiescentcurrent,85µA(typ.)

 AbsoluteMaximumRatings
(Note1)
IfMilitary/Aerospacespecifieddevicesarerequired,pleasecontacttheNationalSemiconductorSalesOffice Distributorsforavailabilityandspecifications. InputVoltageV(IN)                                                 20V
OutputCurrent                                                        20mA
JunctionTemperature                                             150 C
StorageTemperature                                            -65 Cto+150 C
LeadTemperature
VaporPhase(60seconds)                                       +215 C
Infrared(15seconds)                                             +220 C
PowerDissipation(^TA=25˚C)(Note2)                       300mW

The LM3420-8.2 series of controllers are monolithic integrated circuits designed for charging and end-of-charge control for Lithium-lon rechargeable batteries.The LM3420-8.2 is available in five fixed voltage versions for one through four cell charger applications(4.2V,8.2V/8.4V,12.6Vand16.8Vrespec-tively).

Included in avery small package is an(internallycompen-sated)op amp,abandgap reference,an NPN output transis-tor,and voltage setting resistors.The amplifier's inverting in-put 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 bandgap reference utilizes temperature drift curvature correction for excellent voltage stability over the operating temperature range.Available with an initial tol-erance of0.5% for the Agrade version,and 1% for the stan-dard version,the LM3420 allows for precision end-of-chargecontrol for Lithium-Ion rechargeable batteries.