a
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
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
ADP3811
Adjustable Final Battery Voltage
APPLICATIONS
Battery Charger Controller for:
LiIon Batteries (ADP3810)
NiCad, NiMH Batteries (ADP3811)
GENERAL DESCRIPTION
Secondary Side, Off-Line
Battery Charger Controllers
ADP3810/ADP3811
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
m
) stages, a preci-
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
Ω
sense resistor. An external dc voltage
on the V
CTRL
input sets the voltage drop. Because this input
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.
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,
FUNCTIONAL BLOCK DIAGRAM
GND
V
CS
V
CC
V
REF
V
SENSE
1.5MΩ
V
REF
80kΩ
UVLO
V
REF
UVLO
R1
R2
ADP3810
ONLY
V
CTRL
UVLO
GM1
ADP3810/
ADP3811
GM2
GM
COMP
OUT
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
World Wide Web Site: http://www.analog.com
Fax: 617/326-8703
© Analog Devices, Inc., 1996
ADP3810/ADP3811–SPECIFICATIONS
(–40 C
≤
T
≤
+85 C, V
A
CC
= 10.0 V, unless otherwise noted)
Units
mV
mV
V
dB
nA
%
Ω
Ω
Ω
Ω
mV
nA
dB
V
+1.0
+1.8
+0.25
0.02
%
%
%
%/V
µV
p-p
mA
mA
V
V/V
V
V
V
mA
mA
Parameter
CURRENT SENSE
1
Full-Scale Current Sense Voltage
Minimum Current Sense Voltage
Current Programming Input Range
Gain (V
OUT
/V
CS
)
Control Input Bias Current
VOLTAGE SENSE
Accuracy
2
—ADP3810
Input Resistance—ADP3810
Input Resistance—ADP3810
Input Resistance—ADP3810
Input Resistance—ADP3810
Offset Voltage—ADP3811
Bias Current—ADP3811
Gain (V
OUT
/V
SENSE
)
3
REFERENCE
Output Voltage
Accuracy
ADP3810
ADP3811
Load Regulation
Line Regulation
Output Voltage Noise
Load Current (Sourcing)
OUTPUT
Output Current
Saturation Voltage
Gain (V
OUT
/V
COMP
)
UNDERVOLTAGE LOCKOUT
Trip Point-On
Trip Point-Off
POWER SUPPLY
Operating Range
Quiescent Current
Turn-Off Current
OVERVOLTAGE COMPARATOR
Threshold
ADP3810
ADP3811
Response Time
Conditions
V
CTRL
= 1.2 V
0.0 V
≤
V
CTRL
≤
0.1 V
R
L
= 1 kΩ
V
CTRL
Pin
Symbol
ADP3810
Min
Typ
Max
–315
–32
0.0
74
–300
–25
86
10
–285
–18
1.2
40
+1.0
210k
420k
630k
840k
–2.5
60
1
74
2.000
–1.0
–1.8
–0.25
+2.5
10
V
CTRL
A
VCS
I
BCTRL
–1.0
4.2 V Option
8.4 V Option
12.6 V Option
16.8 V Option
R
IN
R
IN
R
IN
R
IN
V
OS
I
B
A
VBAT
V
REF
R
L
= 1 kΩ
C
L
= 0.1
µF
4
I
LOAD
= 0 mA to 5 mA
V
CC
= 2.7 V to 16 V
0.1 Hz to 10 Hz
e
N
I
L
I
OUT
V
SAT
A
VOUT
5
4
0.004
35
10
6
0.1
6
2.65
2.6
V
CC
= 2.7 V
I
OUT
= 4 mA, V
CC
–V
OUT
R
L
= 1 kΩ
0.4
2.7
2.5
2.7
I
Q
V
CC
≥
2.7 V
V
CC
≤
2.5 V
1.5
0.5
16
3
1
Percent Above Full Scale
5
Percent Above Full Scale
5
I
OUT
from 0 mA to 2 mA
V
OV
%
V
OV
%
t
r
6
6
8
%
%
µs
NOTES
1
20 kΩ resistor from current sense voltage to V
CS
pin.
2
Applies to 4.2 V, 8.4 V, 12.6 V and 16.8 V options. Includes all error from offset voltage, bias current, resistor divider and voltage reference.
3
Does not include attenuation of input resistor divider for ADP3810.
4
0.1
µF
load capacitor required for reference operation.
5
Full scale is the programmed final battery voltage: 4.2 V, 8.4 V, 12.6 V or 16.8 V for the ADP3810 or 2.0 V at V
SENSE
for the ADP3811.
All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC) methods.
Specifications subject to change without notice.
–2–
REV. 0
ADP3810/ADP3811
ABSOLUTE MAXIMUM RATINGS
PIN CONFIGURATION
V
SENSE
1
V
CS
2
COMP 3
8 V
CC
Supply Voltage, V
CC
. . . . . . . . . . . . . . . . . . . –0.4 V to 18 V
V
CTRL
, V
CS
Input Range . . . . . . . . . . . . . . . . . . –0.4 V to V
CC
V
SENSE
Input Range (ADP3811) . . . . . . . . . . . . –0.4 V to V
CC
V
SENSE
Input Range (ADP3810) . . . . . . . . . . . –0.4 V to 20 V
Maximum Power Dissipation . . . . . . . . . . . . . . . . . . 500 mW
Operating Temperature Range . . . . . . . . . . . –40°C to +85°C
Storage Temperature Range . . . . . . . . . . . . . –65°C to 150°C
Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . . +300°C
ORDERING GUIDE
ADP3810
ADP3811
7 V
REF
TOP VIEW
6 GND
(Not to Scale)
5 V
CTRL
OUT 4
PIN DESCRIPTION
Mnemonic Function
Model
ADP3810AR-4.2
ADP3810AR-8.4
ADP3810AR-12.6
ADP3810AR-16.8
ADP3811AR
Temperature
Range
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
Package
Option
SO-8
SO-8
SO-8
SO-8
SO-8
Battery
Voltage
4.2 V
8.4 V
12.6 V
16.8 V
Adjustable
V
SENSE
V
CS
V
REF
COMP
OUT
V
CTRL
V
CC
GND
Battery Voltage Sense Input.
Current Sense Input.
Reference Output. Nominally 2.0 V.
External Compensation Pin.
Optocoupler Current Output Drive.
DC Control Input to Set Current Limit, 0 V to 1.2 V.
Positive Supply.
Ground Pin.
V
BAT
OUT
V
IN
IN
CTRL
DC/DC
CONVERTER
GND
2.0V
R3
R1
0.1µF
0.1µF
R2
ADP3811
ONLY
I
CHARGE
RETURN
V
RCS
R
CS
BATTERY
V
CS
V
REF
1.5MΩ
V
CTRL
80kΩ
V
CC
UVLO
UVLO
V
REF
V
SENSE
R1 ADP3810
ONLY
R2
GM1
BUFFER
ADP3810/
ADP3811
200Ω
V
REF
GM2
UVLO
I
OUT
OUT
GM3
1.2V
100µA
COMP
C
C
R
C
GND
Figure 1. Simplified Battery Charger
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the ADP3810/ADP3811 features proprietary ESD protection circuitry, permanent
damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper
ESD precautions are recommended to avoid performance degradation or loss of functionality.
WARNING!
ESD SENSITIVE DEVICE
REV. 0
–3–
ADP3810/ADP3811–Typical Performance Characteristics
2 TYPICAL PARTS
REFERENCE VOLTAGE – Volts
DROPOUT VOLTAGE – mV
2.002
V
CC
= +10V
I
L
= 100µA
C
L
= 0.1µF
V
CC
= +10V
C
L
= 0.1µF
200
REFERENCE DROPOUT VOLTAGE – Volts
2.004
250
0.14
V
CC
= +10V
I
L
= 5mA
C
L
= 0.1µF
0.12
2.000
150
0.10
1.998
100
0.08
1.996
50
0.06
1.994
–50
0
–25
0
25
50
TEMPERATURE –
°C
75
100
0
3
6
9
12
LOAD CURRENT – mA
15
18
0.04
–50
–25
0
25
50
TEMPERATURE –
°C
75
100
Figure 2. Reference Output Voltage
vs. Temperature for Two Typical Parts
Figure 3. Reference Drop-Out Volt
age (V
CC
–V
REF
) vs. Load Current
Figure 4. Reference Dropout Voltage
vs. Temperature
–20
REFERENCE NOISE DENSITY – nV/
√
Hz
3000
1.6
CHARGE CURRENT – Amps
–30
V
CC
= +10V
I
L
= 100µA
C
L
= 0.1µF
2500
V
CC
= +10V
I
L
= 100µA
C
L
= 0.1µF
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
R
CS
= 0.25Ω
R3 = 20kΩ
–40
PSRR – dB
2000
–50
1500
–60
1000
–70
–80
100
500
0
1k
10k
100k
FREQUENCY – Hz
1M
1
10
100
1k
FREQUENCY – Hz
10k
0
0.2
0.4
0.6
0.8
1.0 1.2
CONTROL VOLTAGE, V
CTRL
– Volts
1.4
Figure 5. Reference PSRR vs.
Frequency
Figure 6. Reference Noise Density
vs. Frequency
Figure 7. Charge Current vs. Control
Voltage
–294
–294
100
CURRENT SENSE VOLTAGE – mV
CURRENT SENSE VOLTAGE – mV
V
CC
= +10V
R3 = 20kΩ
–296
V
CC
= +10V
R3 = 20kΩ
–296
OPEN-LOOP GAIN – dB
80
60
40
20
0
–20
–40
PHASE
GAIN
C
COMP
= 0.01µF
T
A
= +25°C
V
CC
= +10V
45
90
135
180
225
1M
–300
–300
–302
–302
–304
–50
–304
–25
0
25
50
TEMPERATURE –
°C
75
100
2
6
8
10
12
14
4
SUPPLY VOLTAGE, V
CC
– Volts
16
–60
10
100
1k
10k
100k
FREQUENCY – Hz
Figure 8. Full-Scale Current Sense
Voltage vs. Temperature
Figure 9. Full-Scale Current Sense
Voltage vs. V
CC
Figure 10. GM1 Open-Loop Gain and
Phase vs. Frequency
–4–
REV. 0
PHASE SHIFT – Degrees
–298
–298
0
ADP3810/ADP3811
100
VOLTAGE SENSE ACCURACY – %
GAIN
VOLTAGE SENSE ACCURACY – %
80
OPEN-LOOP GAIN – dB
60
40
20
0
–20
–40
–60
10
PHASE
C
COMP
= 0.01µF
T
A
= +25°C
V
CC
= +10V
1.0
V
CC
= +10V
0.5
1.0
T
A
= +25°C
0.5
0
45
90
135
180
225
1M
PHASE SHIFT – Degrees
0
0
–0.5
–0.5
–1.0
–1.0
100
1k
10k
100k
FREQUENCY – Hz
–1.5
–50
–1.5
–25
0
25
50
TEMPERATURE –
°C
75
100
0
6
9
12
15
3
SUPPLY VOLTAGE, V
CC
– Volts
18
Figure 11. GM2 Open-Loop Gain and
Phase vs. Frequency
Figure 12. ADP3810 Voltage Sense
Accuracy vs. Temperature
Figure 13. ADP3810 Voltage Sense
Accuracy vs. V
CC
1.0
V
CC
= +10V
0.5
GM2 OFFSET – mV
1.0
T
A
= +25°C
2.5
V
CC
= +10V
0
0
V
SENSE
BIAS CURRENT – nA
0
6
9
12
15
3
SUPPLY VOLTAGE, V
CC
– Volts
18
0.5
2.0
GM2 OFFSET – mV
1.5
–0.5
–0.5
1.0
–1.0
–1.0
0.5
–1.5
–50
–25
0
25
50
TEMPERATURE –
°C
75
100
–1.5
0
–50
–25
0
25
50
TEMPERATURE –
°C
75
100
Figure 14. ADP3811 GM2 Offset vs.
Temperature
Figure 15. ADP3811, GM2 Offset
vs. V
CC
Figure 16. ADP3811 V
SENSE
Bias
Current vs. Temperature
2.5
T
A
= +25°C
V
SENSE
BIAS CURRENT – nA
120
V
CC
= +10V
T
A
= +25°C
12
V
CC
= +10V
10
2.0
100
QUANTITY – Parts
80
60
1.0
V
OV%
– %
1.5
8
6
40
4
0.5
20
0
5.0 5.2 5.4 5.6 5.8 6.0 6.2 6.4 6.6 6.8 7.0
V
OV%
– %
0
0
6
9
12
15
3
SUPPLY VOLTAGE, V
CC
– Volts
18
2
–50
–25
0
25
50
TEMPERATURE –
°C
75
100
Figure 17. ADP3811 V
SENSE
Bias
Current vs. V
CC
Figure 18. Overvoltage Comparator
Distribution (V
OV%
)
Figure 19. Overvoltage Comparator
Threshold (V
OV%)
vs. Temperature
REV. 0
–5–
京公网安备 11010802033920号
EEWORLD
