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 an 8.4-V version for one through four cell charger applications.
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. The LM3420 series allows for precision end-of-charge voltage threshold for lithium-ion rechargeable batteries. The premium grade LM3420A is available with an initial voltage threshold tolerance of ±0.5%, while the standard grade LM3420 has an initial voltage threshold tolerance of ±1%.
The LM3420 is available in a sub-miniature 5-lead surface mount package thus allowing very compact designs.
| Typ | Titel | Datum | ||
|---|---|---|---|---|
| * | Data sheet | LM3420 8.4-V Li-Ion Battery Charge Controller datasheet (Rev. E) | PDF | HTML | 15 Dez 2014 |
| EVM User's guide | AN-1967 LM3424 Buck-Boost Evaluation Board (Rev. A) | 03 Mai 2013 | ||
| EVM User's guide | AN-1969 LM3424 Boost Evaluation Board (Rev. A) | 03 Mai 2013 | ||
| EVM User's guide | AN-1985 LM3429 Buck-Boost Evaluation Board (Rev. C) | 03 Mai 2013 | ||
| EVM User's guide | AN-1986 LM3429 Boost Evaluation Board (Rev. B) | 03 Mai 2013 | ||
| EVM User's guide | AN-1872 LM3423 Boost Evaluation Board (Rev. B) | 01 Mai 2013 | ||
| EVM User's guide | AN-1907 LM3423 Buck-Boost Configuration Evaluation Board (Rev. A) | 01 Mai 2013 | ||
| Application note | Battery Charging | 21 Mär 2007 |
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