ADP3810 Analog Devices, ADP3810 Datasheet

ADP3810

Manufacturer Part Number

ADP3810

Description

Secondary Side/ Off-Line Battery Charger Controllers

Manufacturer

Analog Devices

Datasheets

1.ADP3810.pdf (16 pages)

2.ADP3810.pdf (16 pages)

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Part Number

Manufacturer

Quantity

Price

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Part Number:

ADP3810AR-4.2

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Company:

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Part Number:

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GENERAL DESCRIPTION

The ADP3810 and ADP3811 combine a programmable current

limit with a battery voltage limit to provide a constant current,

constant voltage battery charger controller. In secondary side,

REV. 0

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

FEATURES

Programmable Charge Current

High Precision Battery Voltage Limit

Precision 2.000 V Reference

Low Voltage Drop Current Sense: 300 mV Full Scale

Full Operation in Shorted and Open Battery Conditions

Drives Diode-Side of Optocoupler

Wide Operating Supply Range: 2.7 V to 16 V

Undervoltage Lockout

SO-8 Package

ADP3810

ADP3811

APPLICATIONS

Battery Charger Controller for:

Internal Precision Voltage Divider for Battery Sense

Four Final Battery Voltage Options Available: 4.2 V,

8.4 V, 12.6 V, 16.8 V

Adjustable Final Battery Voltage

LiIon Batteries (ADP3810)

NiCad, NiMH Batteries (ADP3811)

CTRL

REF

1.5M

GND

OUT

UVLO

80k

FUNCTIONAL BLOCK DIAGRAM

GM1

UVLO

ADP3810/

ADP3811

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 617/329-4700

Fax: 617/326-8703

off-line applications, the output directly drives the diode side of

an optocoupler to give isolated feedback control of a primary

side PWM. The circuitry includes two gain (g

sion 2.0 V reference, a control input buffer, an Undervoltage

Lock Out (UVLO) comparator, an output buffer and an over-

voltage comparator.

The current limit amplifier senses the voltage drop across an

external sense resistor to control the average current for charg-

ing a battery. The voltage drop can be adjusted from 25 mV

to 300 mV, giving a charging current limit from 100 mA to

1.2 amps with a 0.25

on the V

is high impedance, a filtered PWM output can be used to set

the voltage.

As the battery voltage approaches its voltage limit, the voltage

sense amplifier takes over to maintain a constant battery volt-

age. The two amplifiers essentially operate in an “OR” fash-

ion. Either the current is limited, or the voltage is limited.

The ADP3810 has internal thin-film resistors that are trimmed

to provide a precise final voltage for LiIon batteries. Four volt-

age options are available, corresponding to 1-4 LiIon cells as

follows: 4.2 V, 8.4 V, 12.6 V and 16.8 V.

The ADP3811 omits these resistors allowing any battery volt-

age to be programmed with external resistors.

REF

Battery Charger Controllers

CTRL

REF

input sets the voltage drop. Because this input

Secondary Side, Off-Line

SENSE

GM2

World Wide Web Site: http://www.analog.com

ADP3810/ADP3811

sense resistor. An external dc voltage

ADP3810

ONLY

COMP

) stages, a preci-

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