Product details

Number of series cells 1, 2, 3, 4 Charge current (Max) (A) 0.015 Operating Vin (Max) (V) 20 Cell chemistry Li-Ion/Li-Polymer Battery charge voltage (Min) (V) 4.2 Battery charge voltage (Max) (V) 4.2 Absolute Vin (safety rating) (Max) ((V)) 20 Control interface Standalone (RC-Settable) Features IC thermal regulation Operating Vin (Min) (V) 13 Rating Catalog
Number of series cells 1, 2, 3, 4 Charge current (Max) (A) 0.015 Operating Vin (Max) (V) 20 Cell chemistry Li-Ion/Li-Polymer Battery charge voltage (Min) (V) 4.2 Battery charge voltage (Max) (V) 4.2 Absolute Vin (safety rating) (Max) ((V)) 20 Control interface Standalone (RC-Settable) Features IC thermal regulation Operating Vin (Min) (V) 13 Rating Catalog
SOT-23 (DBV) 5 5 mm² 2.9 x 1.6
  • Input Voltage Range: up to 20 V
  • Voltage Options for Charging 1, 2, 3, or 4 Cells
  • Output Current up to 15 mA
  • Precision (0.5%) End-of-Charge Control
    • LM3420 ±1%
    • LM3420A ±0.5%
  • Drive Capability for External Power Stage
  • Temperature Drift Curvature Correction for
    Voltage Stability
  • Low Quiescent Current, 85 µA (Typ.)
  • Tiny SOT-23-5 package
  • Input Voltage Range: up to 20 V
  • Voltage Options for Charging 1, 2, 3, or 4 Cells
  • Output Current up to 15 mA
  • Precision (0.5%) End-of-Charge Control
    • LM3420 ±1%
    • LM3420A ±0.5%
  • Drive Capability for External Power Stage
  • Temperature Drift Curvature Correction for
    Voltage Stability
  • Low Quiescent Current, 85 µA (Typ.)
  • Tiny SOT-23-5 package

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.

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.

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Technical documentation

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Type Title Date
* Data sheet LM3420 8.4-V Li-Ion Battery Charge Controller datasheet (Rev. E) PDF | HTML 15 Dec 2014
Technical article When to use rechargeable batteries in small battery applications 01 Oct 2019
Technical article Should I use a linear charger or a switching charger? 31 Oct 2015
Technical article Summertime and the livin' is easy 20 Jun 2014
EVM User's guide AN-1967 LM3424 Buck-Boost Evaluation Board (Rev. A) 03 May 2013
EVM User's guide AN-1969 LM3424 Boost Evaluation Board (Rev. A) 03 May 2013
EVM User's guide AN-1985 LM3429 Buck-Boost Evaluation Board (Rev. C) 03 May 2013
EVM User's guide AN-1986 LM3429 Boost Evaluation Board (Rev. B) 03 May 2013
EVM User's guide AN-1872 LM3423 Boost Evaluation Board (Rev. B) 01 May 2013
EVM User's guide AN-1907 LM3423 Buck-Boost Configuration Evaluation Board (Rev. A) 01 May 2013
Application note Battery Charging 21 Mar 2007

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SOT-23 (DBV) 5 View options

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