LM3622AM-8.2 NSC [National Semiconductor], LM3622AM-8.2 Datasheet

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LM3622AM-8.2

Manufacturer Part Number
LM3622AM-8.2
Description
Lithium-Ion Battery Charger Controller
Manufacturer
NSC [National Semiconductor]
Datasheet

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© 2000 National Semiconductor Corporation
LM3622
Lithium-Ion Battery Charger Controller
General Description
The LM3622 is a charge controller for Lithium-Ion batteries.
This monolithic integrated circuit accurately controls an ex-
ternal pass transistor for precision Lithium-Ion battery charg-
ing. The LM3622 provides a constant voltage or constant
current (CVCC) configuration that changes, as necessary, to
optimally charge lithium-ion battery cells. Voltage charging
versions (4.1V, 4.2V, 8.2V, and 8.4V) are available for one or
two cell battery packs and for coke or graphite anode battery
chemistry.
The LM3622 accepts input voltages from 4.5V to 24V. Con-
troller accuracy over temperature is
and
nal resistors are required. Furthermore, the LM3622’s propri-
etary output voltage sensing circuit drains less than 200nA
from the battery when the input source is disconnected.
The LM3622 circuitry includes functions for regulating the
charge voltage with a temperature compensated bandgap
reference and regulating the current with an external sense
resistor. The internal bandgap insures excellent controller
performance over the operating temperature and input sup-
ply range.
The LM3622 can sink 15mA minimum at the EXT pin to drive
the base of an external PNP pass transistor. It also has
Typical Application
±
50mV/cell for the standard grade. No precision exter-
±
30mV/cell for A grade
DS100974
low-voltage battery threshold circuitry that removes this drive
when the cell voltage drops below a preset limit. The LV
pin programs this threshold voltage to either 2.7V/cell or
2.15V/cell. The low-voltage detection, which is a user en-
abled feature, provides an output signal that can be used to
enable a wake up charge source automatically to precon-
dition a deeply discharged pack.
The LM3622 is available in a standard 8-lead SOIC surface
mount package.
Features
n Versions for charging of 1 cell (4.1V or 4.2V) or 2 cells
n Versions for coke or graphite anode
n Precision (
n Wide input range: 4.5V-24V
n Low battery drain leakage: 200nA
n 15 mA available to drive low cost PNP
Applications
n Cellular phone cradle charger
n PDA/Notebook cradle charger
n Camcorder cradle charger
(8.2V or 8.4V)
±
30mV/cell) end-of-charge control
DS100974-1
February 2000
www.national.com
SEL

Related parts for LM3622AM-8.2

LM3622AM-8.2 Summary of contents

Page 1

LM3622 Lithium-Ion Battery Charger Controller General Description The LM3622 is a charge controller for Lithium-Ion batteries. This monolithic integrated circuit accurately controls an ex- ternal pass transistor for precision Lithium-Ion battery charg- ing. The LM3622 provides a constant voltage or ...

Page 2

Connection Diagram Refer to the Ordering Information Table in this Datasheet for Specific Part Number Pin Description Pin No. Name I Input SEL 2 LV Input ENB 3 LV Output 4 GND Ground 5 CS Input 6 CEL ...

Page 3

... LM3622M-4.1 ± 50mV LM3622MX-4.1 ± 30mV LM3622AM-4.2 ± 30mV LM3622AMX-4.2 ± 50mV LM3622M-4.2 ± 50mV LM3622MX-4.2 ± 60mV LM3622AM-8.2 ± 60mV LM3622AMX-8.2 100mV LM3622M-8.2 100mV LM3622MX-8.2 ± 60mV LM3622AM-8.4 ± 60mV LM3622AMX-8.4 100mV LM3622M-8.4 100mV LM3622MX-8.4 3 Supplied As 95 unit increments in rail ...

Page 4

Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage ( EXT (Note 2) LV SEL LV ENB ESD Susceptibility (Note 3) Storage Temperature ...

Page 5

Typical Performance Characteristics Output Voltage Regulation DS100974-5 Output Drive Current DS100974-6 Unless otherwise specified, T Current Sense Voltage Regulation DS100974-8 Output Drive Current DS100974 25˚C. A ...

Page 6

Functional Description The simplified LM3622 block diagram in Figure 1 gives a general idea of the circuit operation. The controller integrates the reference, feedback and drive functions on-chip to con- trol a linear, lithium-ion battery charger in constant voltage and ...

Page 7

Typical Application FIGURE 2. Low Dropout, Constant Current/Constant Voltage Li-ion Battery Charger The low dropout linear charger shown in Figure 2 provides constant current and constant voltage charging of 1-cell lithium-ion battery packs. J1 and J2 are used for selecting ...

Page 8

Timing Diagram FIGURE 3. Typical Charge Cycle with Low-Voltage Detection Enabled. www.national.com DS100974-12 8 ...

Page 9

Physical Dimensions LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. ...

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