Features: 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 PNPApplicationCellular phone cradle charger
PDA/Notebook cradle charger
Camcorder cradle chargerPinout
SpecificationsSupply Voltage (VCC) ..........................................................-0.3 to 24V
LV .......................................................................................-0.3 to 24V
EXT (Note 2)....................................................................... -0.3 to 24V
LVSEL................................................................................. -0.3 to 24V
LVENB................................................................................ -0.3 to 24V
ESD Susceptibility (Note 3)........................................................ 2500V
Storage Temperature ............................................−40°C to +125°C
Lead Temp. Soldering
Vapor Phase (60 sec.) .......................................................215°C
Infrared (15 sec.)..............................................................220°C
Power Dissipation (TA = 25°C)(Note 4)
Max. Package Dissipation ........................................................350mW
| Full Charge Vmax |
8.2, 4.1 Volt |
| Input Min Voltage |
4.5 Volt |
| Input Max Voltage |
24 Volt |
| Battery Cells |
1 or 2 cells |
| Battery Chemistry |
Li-Ion |
| Charge Current |
Depends on external transistor - drive current is 25mA |
| Charge Modes |
CC, CV |
| On/Off Pin |
No |
| Special Features |
Analog CC/CV control, 0.7% tolerance, low-voltage battery detection, coke and graphic anode versions available, Analog CC/CV control, 1.2% tolerance, low-voltage battery detection, coke and graphic anode versions available |
| Full Charge Vmin |
8.2, 4.1 Volt |
| Error Flag |
Yes |
| Adjustable Output |
No |
| Voltage Fault Protection |
Yes |
| Output Current |
Undefined mA |
| RegType |
Linear/LDO Controller |
| Temperature Min |
-20 deg C |
| Temperature Max |
85 deg C |
| View Using Catalog |
DescriptionThe 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.
LM3622 Data Sheet
