LM3622 Charger Controller Datasheet

LM3622 Datasheet, PDF, Equivalent


Part Number

LM3622

Description

Lithium-Ion Battery Charger Controller

Manufacture

etcTI

Total Page 14 Pages
Datasheet
Download LM3622 Datasheet


LM3622
LM3622
www.ti.com
SNVS043A – MAY 2004 – REVISED OCTOBER 2004
LM3622 Lithium-Ion Battery Charger Controller
Check for Samples: LM3622
FEATURES
1
2 Versions for charging of 1 cell (4.1V or 4.2V) or
2 cells (8.2V or 8.4V)
• Versions for coke or graphite anode
• Precision (±30mV/cell) end-of-charge control
• Wide input range: 4.5V-24V
• Low battery drain leakage: 200nA
• 15 mA available to drive low cost PNP
APPLICATIONS
• Cellular phone cradle charger
• PDA/Notebook cradle charger
• Camcorder cradle charger
DESCRIPTION
The LM3622 is a charge controller for Lithium-Ion batteries. This monolithic integrated circuit accurately controls
an external pass transistor for precision Lithium-Ion battery charging. 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. Controller accuracy over temperature is ±30mV/cell for A
grade and ±50mV/cell for the standard grade. No precision external resistors are required. Furthermore, the
LM3622's proprietary 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 supply range.
The LM3622 can sink 15mA minimum at the EXT pin to drive the base of an external PNP pass transistor. It also
has low-voltage battery threshold circuitry that removes this drive when the cell voltage drops below a preset
limit. The LVSEL pin programs this threshold voltage to either 2.7V/cell or 2.15V/cell. The low-voltage detection,
which is a user enabled feature, provides an output signal that can be used to enable a "wake up charge" source
automatically to precondition a deeply discharged pack.
The LM3622 is available in a standard 8-lead SOIC surface mount package.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2004, Texas Instruments Incorporated

LM3622
LM3622
SNVS043A – MAY 2004 – REVISED OCTOBER 2004
Typical Application
www.ti.com
Connection Diagram
8-Lead Surface Mount Package
Figure 1. Refer to the Ordering Information Table in this Datasheet for Specific Part Number
See NS Package M08A
Pin No.
1
2
3
Name
LVSEL
LVENB
LV
4 GND
5 CS
6 CEL
I/O
Input
Input
Output
Ground
Input
Input
Table 1. Pin Description
Description
Low-voltage detection threshold Select. The threshold is 2.15V/cell when this pin is pulled
low to GND and 2.70V/cell when it is pulled up to VCC. The battery voltage is sensed
between CEL and CS pins.
Low-voltage detection Enable. The low-voltage detection is enabled when this pin is pulled
Low to GND. Pulling this pin HIGH to VCC disables the low-voltage detection.
Output of the low-voltage detection. This pin is a NPN open-collector output that goes to low
impedance state when LVENB is pulled LOW and the battery voltage is below the threshold
set by LVSEL. LV stays in HIGH impedance state at any battery voltage when LVENB is
pulled HIGH to VCC. LV can be used for turning on a low current source to recondition a
deeply depleted battery.
IC common.
Input for battery charge current and battery negative-terminal voltage sensing. Battery
charging current is sensed through an external resistor, RCS, connected between the
battery's negative terminal and GND. The maximum charge current is regulated to a value
of 100mV/RCS.
Battery positive-terminal voltage sensing.
2 Submit Documentation Feedback
Product Folder Links: LM3622
Copyright © 2004, Texas Instruments Incorporated


Features LM3622 www.ti.com SNVS043A – MAY 200 4 – REVISED OCTOBER 2004 LM3622 Lith ium-Ion Battery Charger Controller Chec k for Samples: LM3622 FEATURES 1 •2 Versions for charging of 1 cell (4.1V o r 4.2V) or 2 cells (8.2V or 8.4V) • V ersions for coke or graphite anode • Precision (±30mV/cell) end-of-charge c ontrol • Wide input range: 4.5V-24V Low battery drain leakage: 200nA 15 mA available to drive low cost PNP APPLICATIONS • Cellular phone cradle charger • PDA/Notebook cradle charge r • Camcorder cradle charger DESCRIP TION The LM3622 is a charge controller for Lithium-Ion batteries. This monolit hic integrated circuit accurately contr ols an external pass transistor for pre cision Lithium-Ion battery charging. Th e LM3622 provides a constant voltage or constant current (CVCC) configuration that changes, as necessary, to optimall y charge lithium-ion battery cells. Vol tage charging versions (4.1V, 4.2V, 8.2 V, and 8.4V) are available for one or two cell battery packs and for coke or graphite .
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