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LM3420AM5-16.8 Fiches technique(PDF) 1 Page - National Semiconductor (TI) |
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LM3420AM5-16.8 Fiches technique(HTML) 1 Page - National Semiconductor (TI) |
1 / 17 page LM3420-4.2, -8.2, -8.4, -12.6, -16.8 Lithium-Ion Battery Charge Controller General Description 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 respec- tively). Included in a very small package is an (internally compen- sated) op amp, a bandgap 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 of 0.5% for the A grade version, and 1% for the stan- dard 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. Features n Voltage options for charging 1, 2, 3 or 4 cells n Tiny SOT23-5 package n Precision (0.5%) end-of-charge control n Drive capability for external power stage n Low quiescent current, 85 µA (typ.) Applications n Lithium-Ion battery charging n Suitable for linear and switching regulator charger designs Typical Application and Functional Diagram SIMPLE SWITCHER® is a registered trademark of National Semiconductor Corporation. DS012359-1 Typical Constant Current/Constant Voltage Li-Ion Battery Charger DS012359-2 LM3420 Functional Diagram July 2000 © 2000 National Semiconductor Corporation DS012359 www.national.com |
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