ADP3810AR-16.8 Analog Devices Inc, ADP3810AR-16.8 Datasheet

ADP3810AR-16.8

Manufacturer Part Number

ADP3810AR-16.8

Description

Manufacturer

Analog Devices Inc

Type

Battery Chargerr

Datasheet

1.ADP3810AR-16.8.pdf (14 pages)

Specifications of ADP3810AR-16.8

Output Voltage

16.8V

Operating Supply Voltage (min)

2.7V

Operating Supply Voltage (max)

16V

Operating Temp Range

-40C to 85C

Package Type

SOIC N

Mounting

Surface Mount

Pin Count

Operating Temperature Classification

Industrial

Lead Free Status / Rohs Status

Not Compliant

Current page: 1 of 14
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The ADP3810 and ADP3811 combine a programmable current

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

GENERAL DESCRIPTION

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

constant voltage battery charger controller. In secondary side,

REV.O

Information

reliable. However, no responsibility

use, nor for any infringements

otherwise

W DEVICES

Wide Operating Supply Range: 2.7 V to 16 V

SO-8 Package

ADP3810

ADP3811

APPLICATIONS

Battery Charger Controller for:

FEATURES

Programmable

High Precision Battery Voltage Limit

Precision 2.000 V Reference

Full Operation in Shorted and Open Battery Conditions

Drives Diode-Side of Optocoupler

Undervoltage

Low Voltage Drop Current Sense: 300 mV Full Scale

Internal Precision Voltage Divider for Battery Sense

8.4 V, 12.6 V, 16.8 V

Adjustable Final Battery Voltage

Lilon Batteries (ADP3810)

NiCad, NiMH Batteries (ADP3811)

Four Final Battery Voltage Options Available: 4.2 V,

under any patent or patent rights of Analog Devices.

furnished

ANALOG

Lockout

by Analog Devices is believed to be accurate

Charge Current

VCTRL

of patents or other rights of third parties

VREF

is assumed

1.5MQ

OUT

GND

by Analog Devices for its

80kQ

FUNCTIONAL

Vcs

and

UVLO

BLOCK DIAGRAM

VCC

ADP3810/

ADP3811

Tel: 617/329-4700

One Technology

Fax: 617/326-8703

As the battery voltage approaches its voltage limit, the voltage

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.

voltage comparator.

The current limit amplifier senses the voltage drop across an

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

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

on the VCTRL input sets the voltage drop. Because this input

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

the voltage.

sense amplifier takes over to maintain a constant battery volt-

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

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 (grJ stages, a preci-

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

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

external sense resistor to control the average current for charg-

1.2 amps with a 0.25 .Qsense resistor. An external dc voltage

BatteryChargerControllers

VREF VSENSE

Secondary Side,Off-Line

Way, P.O. Box 9106, Norwood,

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

ADP381~DP3811

CaMP

@ Analog Devices, Inc., 1996

MA 02062-9106,

U.S.A.

Related parts for ADP3810AR-16.8

ADP3810AR-16.8 Summary of contents

Page 1

ANALOG W 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 ...

Page 2

ADP381 O /ADP3811-SPECIFICATIONS Parameter CURRENT SENSEI Full-Scale Current Sense Voltage Minimum Current Sense Voltage Current Programming Input Range Gain (VoUTNcs) Control Input Bias Current VOLTAGE SENSE Accuracy2-ADP381 0 Input Resistance-ADP3810 Input Resistance-ADP3810 Input Resistance-ADP3810 Input Resistance-ADP381 0 Offset Voltage-ADP3811 Bias ...

Page 3

... Temperature Package Model Range Option ADP3810AR-4.2 -40°C to +85°C SO-8 SO-8 ADP3810AR-8.4 -40°C to +85°C ADP3810AR-12.6 -40°C to +85°C SO-8 -40°C to +85°C SO-8 ADP3810AR-16.8 -40°C to +85°C SO-8 ADP3811AR OUT DC/DC V'N IN CONVERTER GND CTRL VCTRL lOUT ... OUT CAUTION ESD (electrostatic discharge) sensitive device ...

Page 4

ADP381 O /ADP3811-Typical 2.004 .. '6 2.002 > 2.000 0 > ~ 1.998 z w II: w "- II! 1.996 1.994 100 - -50 TEMPERATURE-'C Figure 2. Reference Output Voltage vs. Temperature ...

Page 5

I 135 rJ 180 :J: Q. 225 100 1k 10k 1OOk 1M - FREQUENCY Hz Figure 11. GM2 Open-Loop Gain and Phase vs. Frequency 1 Vee +10V ...

Page 6

ADP3810/ADP3811 240 I VC='+10V +25°C 200 A RL= 1kQ ~ 160 .. '" 120 1= z -0: 580 r 40 r-U 0 5.0 5.2 5.4 5.6 5.8 6.0 6.2 6.4 6.6 6.8 7.0 - OUTPUT ...

Page 7

Each GM stage is designed to be asymmetrical so that each am- plifier can only source ...

Page 8

DP3810/ADP3811 large current levels can be obtained by either reducing the Ilue of Res or increasing the value of R3. The main penalty of Icreasing R3 is lower efficiency due to the larger voltage drop :ross Res, and the penalty ...

Page 9

Vcc .COMP RF CF 1nF 3.3kQ VFB 3.3ka PWM 3845 " 1% TOLERANCE .. TX1 f = 120kHz LpA = 750llH LSEC=7.5I1H Figure 23. ADP3810/ADP3811 between inductive and capacitive component sizes, switching losses and cost. The primary PWM-IC circuit derives ...

Page 10

ADP3810/ADP3811 battery voltage is at least 1.5 V with a programmed charge cur- rent of 0.1 A. For a higher programmed charge current, the battery voltagecan drop below 1.5 V, and Vee is stilI maintained above 2.7 V. This is ...

Page 11

TA=+25'C 00"" 9!1!!!!!!!!! !!!!! = V'N 220VAC = !!!! !!!!! 1V VCTRL 10V 10 .... ........ .... ........ ........ .... I 0%"" 2VIDIV 50mseclD..IV OV Figure 27. Output Voltage Transient Response to Battery Connect/Disconnect ...

Page 12

ADP3810/ADP3811 +V'N' R1 80.61ill VREF VCTRL R2 0.1pF 201ill VCTRL & VREF RTN V'N, RTN Figure 29. ADP3811 Controlling a Linear Battery Charger The trade-off between using a linear regulator as shown versus using a flyback or buck type of ...

Page 13

POWER STAGE r,Vc COMP RF 3.31ill VFe VOLTAGE ERROR AMPLIFIER Figure 31. Block Diagram of the Linearized Feedback Model amplifiers are represented by voltage controlled current sources, the optocoupler by a current controlled current source, and the error amplifier by ...

Page 14

ADP3810/ADP3811 either present or absent. If the battery is present, its large ca- pacitance creates a very low frequency dominant pole, giving a single pole system. The more demanding case is when the bat- tery is removed. Now the output ...

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