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LM3420-8.4

National Semiconductor
Part Number LM3420-8.4
Manufacturer National Semiconductor
Description Lithium-Ion Battery Charge Controller
Published Mar 22, 2005
Detailed Description LM3420-4.2, -8.2, -8.4, -12.6, -16.8 Lithium-Ion Battery Charge Controller July 2000 LM3420-4.2, -8.2, -8.4, -12.6, -1...
Datasheet PDF File LM3420-8.4 PDF File

LM3420-8.4
LM3420-8.4

Overview
LM3420-4.
2, -8.
2, -8.
4, -12.
6, -16.
8 Lithium-Ion Battery Charge Controller July 2000 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 respectively).
Included in a very small package is an (internally compensated) op amp, a bandgap 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 bandgap 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.
Features n n n n n Voltage options for charging 1, 2, 3 or 4 cells Tiny SOT23-5 package Precision (0.
5%) end-of-charge control Drive capability for external power stage 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 DS012359-1 Typical Constant Current/Constant Voltage Li-Ion Battery Charger DS012359-2 LM3420 Functional Diagram SIMPLE SWITCHER ® is a registered trademark of National Semiconductor Corporation.
© 2000 National Semiconductor Corporation DS012359 www.
national.
com LM3420-4.
2/LM3420-8.
2/LM3420-8.
4/LM3420-12.
6/LM3420-16...


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