NSC LM3622MX-8.4, LM3622MX-8.2, LM3622MX-4.2, LM3622MX-4.1, LM3622M-4.1 Datasheet
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February 2000
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 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 ²wake up charge² source automatically to precondition a deeply discharged pack.
The LM3622 is available in a standard 8-lead SOIC surface mount package.
Features
nVersions for charging of 1 cell (4.1V or 4.2V) or 2 cells (8.2V or 8.4V)
nVersions for coke or graphite anode
nPrecision (±30mV/cell) end-of-charge control
nWide input range: 4.5V-24V
nLow battery drain leakage: 200nA
n15 mA available to drive low cost PNP
Applications
nCellular phone cradle charger
nPDA/Notebook cradle charger
nCamcorder cradle charger
Typical Application
DS100974-1
Controller Charger Battery Ion-Lithium LM3622
© 2000 National Semiconductor Corporation |
DS100974 |
www.national.com |
LM3622
Connection Diagram
8-Lead Surface Mount Package
DS100974-2
Refer to the Ordering Information Table in this Datasheet for Specific Part Number
See NS Package M08A
Pin Description
Pin No. |
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Name |
I/O |
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Description |
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1 |
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LVSEL |
Input |
Low-voltage detection threshold Select. The threshold is 2.15V/cell when this pin is |
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pulled low to GND and 2.70V/cell when it is pulled up to VCC. The battery voltage is |
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sensed between CEL and CS pins. |
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2 |
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Input |
Low-voltage detection Enable. The low-voltage detection is enabled when this pin is |
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LV |
ENB |
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pulled Low to GND. Pulling this pin HIGH to VCC disables the low-voltage detection. |
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3 |
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Output |
Output of the low-voltage detection. This pin is a NPN open-collector output that |
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LV |
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goes to low impedance state when |
LV |
ENB is pulled LOW and the battery voltage is |
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below the threshold set by LVSEL. |
LV |
stays in HIGH impedance state at any battery |
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voltage when |
LV |
ENB is pulled HIGH to VCC. |
LV |
can be used for turning on a low |
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current source to recondition a deeply depleted battery. |
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4 |
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GND |
Ground |
IC common. |
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5 |
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CS |
Input |
Input for battery charge current and battery negative-terminal voltage sensing. |
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Battery charging current is sensed through an external resistor, RCS, connected |
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between the battery's negative terminal and GND. The maximum charge current is |
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regulated to a value of 100mV/RCS. |
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6 |
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CEL |
Input |
Battery positive-terminal voltage sensing. |
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7 |
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EXT |
Output |
Output of the controller for driving a PNP transistor or P-MOSFET. The controller |
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modulates the current sinking into this pin to control the regulation of either the |
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charge current or the battery voltage. |
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8 |
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VCC |
Power Supply |
IC power supply |
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www.national.com |
2 |
Ordering Information
Voltage |
Grade |
Accuracy |
Order Information |
Supplied As |
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4.1V |
A |
±30mV |
LM3622AM-4.1 |
95 unit increments in rail |
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4.1V |
A |
±30mV |
LM3622AMX-4.1 |
2500 unit increments in tape and reel |
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4.1V |
Standard |
±50mV |
LM3622M-4.1 |
95 unit increments in rail |
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4.1V |
Standard |
±50mV |
LM3622MX-4.1 |
2500 unit increments in tape and reel |
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4.2V |
A |
±30mV |
LM3622AM-4.2 |
95 unit increments in rail |
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4.2V |
A |
±30mV |
LM3622AMX-4.2 |
2500 unit increments in tape and reel |
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4.2V |
Standard |
±50mV |
LM3622M-4.2 |
95 unit increments in rail |
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4.2V |
Standard |
±50mV |
LM3622MX-4.2 |
2500 unit increments in tape and reel |
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8.2V |
A |
±60mV |
LM3622AM-8.2 |
95 unit increments in rail |
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8.2V |
A |
±60mV |
LM3622AMX-8.2 |
2500 unit increments in tape and reel |
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8.2V |
Standard |
±100mV |
LM3622M-8.2 |
95 unit increments in rail |
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8.2V |
Standard |
±100mV |
LM3622MX-8.2 |
2500 unit increments in tape and reel |
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8.4V |
A |
±60mV |
LM3622AM-8.4 |
95 unit increments in rail |
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8.4V |
A |
±60mV |
LM3622AMX-8.4 |
2500 unit increments in tape and reel |
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8.4V |
Standard |
±100mV |
LM3622M-8.4 |
95 unit increments in rail |
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8.4V |
Standard |
±100mV |
LM3622MX-8.4 |
2500 unit increments in tape and reel |
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LM3622
3 |
www.national.com |
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