LM3622 Datasheet, PDF (2/9 Pages) National Semiconductor (TI) – Lithium-Ion Battery Charger Controller

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.
1
2
3
4
5
6
7
8
Name
LV_SEL
LV_ENB
LV
GND
CS
CEL
EXT
V_CC
I/O
Input
Input
Output
Ground
Input
Input
Output
Power Supply
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 V_CC. 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 V_CC 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 LV_ENB is pulled LOW and the battery voltage is
below the threshold set by LV_SEL. LV stays in HIGH impedance state at any battery
voltage when LV_ENB is pulled HIGH to V_CC. 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, R_CS, connected
between the battery’s negative terminal and GND. The maximum charge current is
regulated to a value of 100mV/R_CS.
Battery positive-terminal voltage sensing.
Output of the controller for driving a PNP transistor or P-MOSFET. The controller
modulates the current sinking into this pin to control the regulation of either the
charge current or the battery voltage.
IC power supply
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