Part # LM3420 datasheet

Part Manufacturer: National Semiconductor

National Semiconductor

Part Description: LM3420-4.2, -8.2, -8.4, -12.6, -16.8 Lithium-Ion Battery Charge Controller


Part Details:

LM3420-4.2, July 2000 LM3420-4.2, -8.2, -8.4, -12.6, -16.8Lithium-Ion Battery Charge Controller -8.2, General Description The LM3420 is available in a sub-miniature 5-lead SOT23-5surface mount package thus allowing very compact designs. -8.4, The LM3420 series of controllers are monolithic integratedcircuits designed for charging and end-of-charge control for Features Lithium-Ion rechargeable batteries. The LM3420 is availablein five fixed voltage versions for one through four cell charger n Voltage options for charging 1, 2, 3 or 4 cells -12.6, applications (4.2V, 8.2V/8.4V, 12.6V and 16.8V respec- n Tiny SOT23-5 package tively). n Precision (0.5%) end-of-charge control Included in a very small package is an (internally compen- n Drive capability for external power stage sated) op amp, a bandgap reference, an NPN output tran- n Low quiescent current, 85 µA (typ.) -16.8 sistor, and voltage setting resistors. The amplifier s invertinginput is externally accessible for loop frequency compensa- Applications tion. The output is an open-emitter NPN transistor capable ofdriving up to 15 mA of output current into external circuitry. n Lithium-Ion battery charging Lithium-Ion n Suitable for linear and switching regulator charger A trimmed precision bandgap reference utilizes temperature designs drift curvature correction for excellent voltage stability overthe operating temperature range. Available with an initialtolerance of 0.5% for the A grade version, and 1% for thestandard version, the LM3420 allows for precision end-of-charge control for Lithium-Ion rechargeable batteries. Battery Typical Application and Functional Diagram Charge Controller 01235901 Typical Constant Current/Constant Voltage Li-Ion Battery Charger 01235902 LM3420 Functional Diagram SIMPLE SWITCHER® is a registered trademark of National Semiconductor Corporation. © 2004 National Semiconductor Corporation DS012359 www.national.com Connection Diagrams and Order Information 5-Lead Small Outline Package (M5) Actual Size 01235904 01235903 *No internal connection, but should be soldered to PC board for best heattransfer. Top View For Ordering Information See Figure 1 in this Data SheetSee NS Package Number MF05A LM3420-4.2/LM3420-8.2/LM3420-8.4/LM3420-12.6/LM3420-16.8 www.national.com 2


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LM3420.pdf Datasheet