LM3647 National Semiconductor, LM3647 Datasheet

LM3647

Manufacturer Part Number

LM3647

Description

Universal Battery Charger for Li-Ion/ Ni-MH and Ni-Cd Batteries

Manufacturer

National Semiconductor

Datasheet

1.LM3647.pdf (17 pages)

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LM3647

Universal Battery Charger

for Li-Ion, Ni-MH and Ni-Cd Batteries

1.0 General Description

The LM3647 is a charge controller for Lithium-Ion (Li-Ion),

Nickel-Metal Hydride (Ni-MH) and Nickel-Cadmium (Ni-

Cd) batteries. The device can use either a pulsed-current

charging or a constant-current charging technique. The

device can also be conﬁgured to discharge before charg-

ing. Throughout the charging sequence the LM3647 mon-

itors voltage and/or temperature and time in order to

terminate charging.

If both voltage and temperature fail to trigger the termina-

tion requirements, then the maximum time (conﬁgured by

external hardware) steps in which terminates the charging.

In Ni-Cd/Ni-MH mode, four different charging stages are

used:

In Li-Ion mode, four different charging stages are used:

The charge current of the LM3647 is conﬁgured via exter-

nal resistors, which in turn controls the duty cycle of the

PWM switching control output. For cost-sensitive applica-

tions, the LM3647 charge controller can be conﬁgured

without a temperature sensor and to use an external cur-

rent source.

Negative delta voltage (- V)

Maximum voltage

Optional: Delta temperature/delta time ( T/ t)

Optional: Maximum temperature

Backup: Maximum time

Soft-start charge

Fast charge

Topping charge

Maintenance charge

Qualiﬁcation

Fast Charge Phase 1, Constant Current

Fast Charge phase 2, Constant Voltage

Maintenance charge

When using an external current source, the current is con-

trolled by the LM3647 which turns the current source on

and off. The LM3647 automatically detects the presence of

a battery and starts the charging procedure when the bat-

tery is installed. Whenever an error occurs (e.g., short cir-

cuit, temperature too high, temperature too low, bad

battery, charge time over, etc.) the LM3647 will stay in error

mode until the battery is removed or it gets within the al-

lowed charging temperature range. The LM3647 is avail-

able in a standard 20-lead SOIC surface mount package.

Key Features

Applications

Auto-adaptive fast charge

High-resolution, accurate voltage monitoring prevents

Li-Ion undercharge or overcharge

Fast charge, pre-charge and maintenance currents are

provided. Different currents are selectable via external

resistors.

Fast-charge termination by

mum voltage, maximum temperature, negative

age and maximum time

Dynamically detects battery insertion, removal, short

circuit and bad battery without additional hardware

Supports charging of battery packs with 2-8 cells of Ni-

Cd/Ni-MH or 1-4 cells of Li-Ion

Three LED indicators and Buzzer output indicate oper-

ational modes

Ni-MH/Ni-Cd charge mode, Li-Ion charge mode or dis-

charge mode can be selected manually

PWM switching controller

Battery charging systems for:

— Portable consumer electronics

— Audio/video equipment

— Communications equipment

— Point of sale devices

— Power tools

— Personal convenience products

temperature/ time, maxi-

PRELIMINARY

www.national.com

March 2000

volt-

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