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LM3622
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MFG:NS Package Cooled:06+ D/C:500

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Part Number: LM3622

MFG: NS

Package Cooled: 06+

D/C: 500

Description: The LM3622 is a charge controller for Lithium-Ion batteries. This monolithic integrated circuit accurately controls an ...

LM3622 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.

LM3622 Maximum Ratings

Supply Voltage (V_CC) ..........................................................-0.3 to 24V
LV .......................................................................................-0.3 to 24V
EXT (Note 2)....................................................................... -0.3 to 24V
LV_SEL................................................................................. -0.3 to 24V
LVE_NB................................................................................ -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

LM3622 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 PNP

LM3622 Typical Application

Cellular phone cradle charger
PDA/Notebook cradle charger
Camcorder cradle charger

LM3622 Connection Diagram

LM3622 datasheet

LM3622
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Datasheet: LM3622
File Size: 176600 KB
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