LM3420 Datasheet, PDF (1/26 Pages) Texas Instruments – 8.4-V Li-Ion Battery Charge Controller

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LM3420
SNVS116E – MAY 1998 – REVISED DECEMBER 2014
LM3420 8.4-V Li-Ion Battery Charge Controller
1 Features
•1 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
2 Applications
• Lithium-Ion Battery Charging
• Suitable for Linear and Switching Regulator
Charger Designs
space
space
3 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 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.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM3420
SOT-23 (5)
2.90 mm x 1.60 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Simplified Schematic
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.