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LM3622

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SNVS043B –FEBRUARY 2000–REVISED APRIL 2013

LM3622 Lithium-Ion Battery Charger Controller

Check for Samples: LM3622

FEATURES

DESCRIPTION

The LM3622 is a charge controller for Lithium-Ion

• Versions for Charging of 1 Cell (4.1V or 4.2V)

batteries. This monolithic integrated circuit accurately

or 2 Cells (8.2V or 8.4V)

controls an external pass transistor for precision

• Versions for Coke or Graphite Anode

Lithium-Ion battery charging. The LM3622 provides a

• Precision (±30mV/Cell) End-of-Charge Control

constant voltage or constant current (CVCC)

configuration that changes, as necessary, to optimally

• Wide Input Range: 4.5V-24V

charge lithium-ion battery cells. Voltage charging

• Low Battery Drain Leakage: 200nA

versions (4.1V, 4.2V, 8.2V, and 8.4V) are available

• 15 mA Available to Drive Low Cost PNP

for one or two cell battery packs and for coke or

graphite anode battery chemistry.

APPLICATIONS

The LM3622 accepts input voltages from 4.5V to

• Cellular Phone Cradle Charger 24V. Controller accuracy over temperature is

±30mV/cell for A grade and ±50mV/cell for the

• PDA/Notebook Cradle Charger

standard grade. No precision external resistors are

• Camcorder Cradle Charger

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 LV

SEL

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.

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.

2All trademarks are the property of their respective owners.

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.

Summary of content (15 pages)

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LM3622 www.ti.com SNVS043B – FEBRUARY 2000 – REVISED APRIL 2013 LM3622 Lithium-Ion Battery Charger Controller Check for Samples: LM3622 FEATURES 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.
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LM3622 SNVS043B – FEBRUARY 2000 – REVISED APRIL 2013 www.ti.com TYPICAL APPLICATION CONNECTION DIAGRAM Figure 1.
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LM3622 www.ti.com SNVS043B – FEBRUARY 2000 – REVISED APRIL 2013 PIN DESCRIPTION Pin No. Name I/O Description 1 LVSEL Input 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. 2 LVENB Input Low-voltage detection Enable. The low-voltage detection is enabled when this pin is pulled Low to GND.
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LM3622 SNVS043B – FEBRUARY 2000 – REVISED APRIL 2013 www.ti.com ELECTRICAL CHARACTERISTICS LM3622-XX Unless otherwise specified VCC = 5V/Cell TA =TJ = 25°C. Limits with standard typeface apply for TJ = 25°C, and limits in boldface type apply over the indicated temperature range. Symbol 4 Conditions Min Typ 4.5 Max Units 24.0 V Operating power supply range ICC Quiescent Current TJ = 0°C to +70°C VCC = 4.5V/cell (1) VCEL Regulation Voltage LM3622A-4.1 LM3622A-8.2 LM3622A-4.2 LM3622A-8.
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LM3622 www.ti.com SNVS043B – FEBRUARY 2000 – REVISED APRIL 2013 TYPICAL PERFORMANCE CHARACTERISTICS Unless otherwise specified, TA = 25°C. Output Voltage Regulation Vs VCC Current Sense Voltage Regulation Vs VCC Figure 2. Figure 3. Current Sense Voltage Regulation Vs Temperature Output Drive Current Vs VCC Figure 4. Figure 5. Output Drive Current Vs VCC Quiescent Current Vs VCC Figure 6. Figure 7.
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LM3622 SNVS043B – FEBRUARY 2000 – REVISED APRIL 2013 www.ti.com FUNCTIONAL DESCRIPTION Figure 8. LM3622 Simplified Block Diagram The simplified LM3622 block diagram in Figure 8 gives a general idea of the circuit operation. The controller integrates the reference, feedback and drive functions on-chip to control a linear, lithium-ion battery charger in constant voltage and constant current (CVCC) charge operation.
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LM3622 www.ti.com SNVS043B – FEBRUARY 2000 – REVISED APRIL 2013 APPLICATION INFORMATION CEL PIN CURRENT DRAIN The LM3622 has an internal power down switch in series with the on-chip resistor divider that is used for sensing the battery voltage. In the event that the VCC supply is removed, the power down switch will disconnect the resistor divider from the CS pin, preventing the battery from discharging through the CEL pin.
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LM3622 SNVS043B – FEBRUARY 2000 – REVISED APRIL 2013 www.ti.com I-charge = 0.1V/R1 which is equal to 0.5A in this case. Once the battery voltage reaches the target regulation level set by the LM3622, Q2 is controlled to regulate the voltage across the battery, and the constant voltage mode of the charging cycle starts.
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LM3622 www.ti.com SNVS043B – FEBRUARY 2000 – REVISED APRIL 2013 REVISION HISTORY Changes from Revision A (April 2013) to Revision B • Page Changed layout of National Data Sheet to TI format ............................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.com 18-Oct-2013 PACKAGING INFORMATION Orderable Device Status (1) LM3622MX-8.2/NOPB ACTIVE Package Type Package Pins Package Drawing Qty SOIC D 8 2500 Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Green (RoHS & no Sb/Br) SN | CU SN Level-1-260C-UNLIM Op Temp (°C) Device Marking (4/5) -20 to 85 3622 M-8.2 (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device LM3622MX-8.2/NOPB Package Package Pins Type Drawing SOIC D 8 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 2500 330.0 12.4 Pack Materials-Page 1 6.5 B0 (mm) K0 (mm) P1 (mm) 5.4 2.0 8.0 W Pin1 (mm) Quadrant 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM3622MX-8.2/NOPB SOIC D 8 2500 367.0 367.0 35.
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