a
FEATURES
Stand-Alone Li-Ion Battery Chargers
High End-of-Charge Voltage Accuracy
0.4% @ +25 C
0.75% @ –10 C to +70 C
Intelligent End-of-Charge Output Signal
Pin Programmable Cell Number Select
On Chip 3.3 V LDO Regulator
Programmable Charge Current with High Side Sense
Softstart Charge Current
Undervoltage Lockout
Drives External PMOS
10% Adjustable End-of-Charge Voltage
Charges NiCad, NiMH (with External Controller)
PWM Oscillator Frequency:
ADP3801: 200 kHz
ADP3802: 500 kHz
APPLICATIONS
Fast Chargers
Universal Chargers
Cellular Phones
Portable Computers
Portable Instrumentation
Desktop Chargers
Personal Digital Assistants
High Frequency Switch Mode
Dual Li-Ion Battery Chargers
ADP3801/ADP3802
FUNCTIONAL BLOCK DIAGRAM
VCC
DRV
EOC
CS+ CS–
A/B
VL
LDO +
REFERENCE
GATE
DRIVE
CURRENT
LOOP
AMP + EOC
COMPARATOR
A/B
SELECT
MUX
BATA
BATB
ISET
SD
RESET
SHUTDOWN
UVLO
+
RESET
PWM
FINAL BATTERY
VOLTAGE
PROGRAM
(4.2, 8.4, 12.6)
BATTERY
VOLTAGE
ADJUST
10%
PROG
SD\UVLO
VOLTAGE
LOOP
AMP
ADP3801/ADP3802
GND
COMP
ADJ
68 H
V
IN
40m
BATA
BATB
GENERAL DESCRIPTION
The ADP3801 and ADP3802 are complete battery charging
ICs. The devices combine a high accuracy final battery voltage
control with a constant charge current control and an on-board
Low Drop-Out Regulator (LDO). The accuracy of the final
battery voltage control is guaranteed to
±
0.75% to safely charge
Li-Ion batteries. An internal multiplexer allows the alternate
charging of two separate battery stacks. The final voltage is pin
programmable to one of three Li-Ion options: 4.2 V (one Li-Ion
cell), 8.4 V (two Li-Ion cells), or 12.6 V (three Li-Ion cells).
Paired with an external microcontroller for charge termination,
the ADP3801/ADP3802 works as a fast charger for NiCad/
NiMH batteries or as a universal charger for all three battery
chemistries. In addition, a pin is provided for changing the final
battery voltage by up to
±
10% to adjust for variations in battery
chemistry from different Li-Ion manufacturers without loss of
accuracy in the final battery voltage.
VCC DRV
3.3V
VL
EOC
CS+
CS–
A/B
BATA
BATB
SD
RESET
ADP3801/ADP3802
ISET
PROG
GND
COMP
ADJ
Figure 1. 4 Amp Dual Battery Charger
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: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 1998
ADP3801/ADP3802–SPECIFICATIONS
(@ –40 C
≤
T
≤
+85 C, VCC = 10.0 V, unless otherwise noted)
A
Parameter
FINAL BATTERY VOLTAGE
One Li-Ion Cell
Conditions
PROG = V
T1
, ADJ = VL, T
A
= +25°C
PROG = V
T1
, ADJ = VL, –10°C
≤
T
A
≤
+70°C
PROG = V
T1
, ADJ = VL, –40°C
≤
T
A
≤
+85°C
PROG = V
T2
, ADJ = VL, T
A
= +25°C
PROG = V
T2
, ADJ = VL, –10°C
≤
T
A
≤
+70°C
PROG = V
T2
, ADJ = VL, –40°C
≤
T
A
≤
+85°C
PROG = V
T3
, ADJ = VL, T
A
= +25°C
PROG = V
T3
, ADJ = VL, –10°C
≤
T
A
≤
+70°C
PROG = V
T3
, ADJ = VL, –40°C
≤
T
A
≤
+85°C
Symbol
V
BAT
V
BAT
V
BAT
V
BAT
V
BAT
V
BAT
V
BAT
V
BAT
V
BAT
Min
4.180
4.168
4.150
8.366
8.337
8.300
12.550
12.505
12.450
Typ
4.200
Max
4.220
4.232
4.250
8.434
8.463
8.500
12.650
12.695
12.750
Units
V
V
V
V
V
V
V
V
V
Two Li-Ion Cells
1
8.400
Three Li-Ion Cells
1
12.600
BATTERY PROGRAMMING
INPUT (PROG)
One Li-Ion Cell
(4.2 V)
Two Li-Ion Cells
(8.4 V)
Three Li-Ion Cells
(12.6 V)
Fail Safe Voltage
(4.2 V)
PROG Input Current
V
T1
V
T2
V
T3
Defaults to 1 Li-Ion Cell
I
B
V
IH
V
IL
I
IN
R
IN
I
BA
, I
BB
I
BA
, I
BB
0.00
1.00
2.05
3.10
1.5
2.0
0.02
265
0.2
0.2
90
110
2.475
10
8
2
150
375
200
500
1.0
2.0
0.20
1.20
2.30
3.30
5
V
V
V
V
µA
V
V
µA
kΩ
µA
µA
%
%
V
nA
%
µs
A/B SELECT MUX
Select Battery BATB
Select Battery BATA
A/B Input Current
BATA or BATB Input Resistance
Channel Selected
BATA or BATB Input Current
Channel Not Selected
BATA or BATB Shutdown Current Part in Shutdown
BATTERY ADJUST INPUT
2
(ADJ)
% of Final Battery Voltage
% of Final Battery Voltage
ADJ Disable Voltage Threshold
ADJ Bias Current
OVERVOLTAGE COMPARATOR
Trip Point
Response Time
OSCILLATOR
200 kHz Option
500 kHz Option
0% Duty Cycle Threshold
100% Duty Cycle Threshold
GATE DRIVE
Rise Time
Fall Time
Output High Saturation Voltage
Output Low Voltage
CURRENT SENSE AMPLIFIER
Input Common-mode Range
Input Differential Mode Range
Input Offset Voltage
4
Input Bias Current
Input Offset Current
Over Current Trip Point
Response Time
ISET INPUT
Charge Current Programming
Function
Programming Function Accuracy
ISET Bias Current
ADJ = 1.0 V, –10°C
≤
T
A
≤
+70°C
ADJ = 2.3 V, –10°C
≤
T
A
≤
+70°C
0% Change
1.0 V
≤
ADJ
≤
2.3 V
Percent Above V
BAT
DRV Goes High
(ADP3801)
(ADP3802)
@ COMP Pin
@ COMP Pin
C
L
= 1 nF, VCC – 4 V to 90%
C
L
= 1 nF, 90% to VCC – 4 V
VCC – V
DRV
VCC = 8 V
VCC > 8 V
V
CS+
and V
CS–
V
CS3
0.0 V
≤
V
CSCM
≤
VCC – 2 V
0.0 V
≤
V
CSCM
≤
VCC – 2 V
0.0 V
≤
V
CSCM
≤
VCC – 2 V
V
CS3
DRV Goes High
0.8
1
1
1
91
111
2.6
100
185
89
109
I
B
tr
f
OSC
f
OSC
250
625
kHz
kHz
V
V
ns
ns
mV
V
V
t
r
t
f
V
OH
V
OL
V
OL
V
CSCM
V
CSDM
V
CSVOS
V
CSIB
V
CSIOS
tr
35
75
275
1.0
2.0
VCC – 7 VCC – 6
0.0
0.0
1
0.3
0.01
185
2
VCC – 2
185
1
0.15
V
mV
mV
µA
µA
mV
µs
0.0 V
≤
V
ISET
≤
1.65 V
V
ISET
= 1.65 V, –10°C
≤
T
A
≤
+70°C
V
ISET
= 0.10 V, –10°C
≤
T
A
≤
+70°C
0.0 V
≤
V
ISET
≤
1.65 V
V
CS
/V
ISET3
–5
–25
I
B
0.1
±
1.0
±
10
15
+5
+25
100
V/V
%
%
nA
–2–
REV. 0
ADP3801/ADP3802
Parameter
EOC
OUTPUT
5
Trip Point
Hysteresis
SHUTDOWN (SD)
ON
OFF
SD
Input Current
LOW DROPOUT REGULATOR
Output Voltage
6
0 mA
≤
I
LOAD
≤
10 mA,
4.1 V
≤
VCC
≤
20 V, –10°C
≤
T
A
≤
+70°C
0 mA
≤
I
LOAD
≤
10 mA,
4.1 V
≤
VCC
≤
20 V, –40°C
≤
T
A
≤
+85°C
I
LOAD
= 10 mA
Conditions
100 kΩ to VL
100 kΩ to VL
Symbol
V
CS3
V
CS3
SD
H
SD
L
2.0
0.2
0.8
1
Min
Typ
10
0.2
Max
Units
mV
mV
V
V
µA
VL
VL
V
DO
I
VL
3.267
3.250
10
2.5
2.4
2.4
3.3
3.333
3.350
0.8
V
V
V
mA
V
V
V
mA
µA
V
V
Dropout Voltage (VCC – VL)
Output Current Drive
RESET
OUTPUT
VL Rising Threshold
VL Falling Threshold
Output High Logic Level
POWER SUPPLY
ON Supply Current
OFF Supply Current
UVLO
6, 7
VCC Rising Threshold
VCC Falling Threshold
0.4
20
2.7
2.55
2.9
5.0
115
RESET
High
RESET
Low
1 MΩ to Ground External
No External Loads
No External Loads
Turn On
Turn Off, I
VL
= 1 mA
I
SYON
I
SYOFF
2.9
2.8
7.0
180
4.0
3.8
3.9
3.4
NOTES
1
VCC = V
BAT
+ 2 V.
2
See Figure 5.
3
V
CS
= (V
CS+
) – (V
CS–
).
4
Accuracy guaranteed by ISET INPUT, Programming Function Accuracy specification.
5
EOC
Output Comparator monitors charge current, and it is enabled when V
BAT
≥
95% of the final battery voltage.
6
LDO is active during
SD
and UVLO.
7
Turn-off threshold depends on LDO dropout.
All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC) methods.
Specifications subject to change without notice.
REV. 0
–3–
ADP3801/ADP3802
ABSOLUTE MAXIMUM RATINGS*
ORDERING GUIDE
Input Voltage (VCC to GND) . . . . . . . . . . . . . . –0.3 V to 20 V
DRV, V
CS+
, V
CS–
to GND . . . . . . . . . . . . . . . . –0.3 V to VCC
BATA, BATB to GND . . . . . . . . . . . . . . . . . –0.3 V to 14.0 V
A/B, ISET, PROG, ADJ to GND . . . . . . . . . . . –0.3 V to VL
SD, RESET,
COMP,
EOC
to GND . . . . . . . . . . –0.3 V to VL
Power Dissipation . . . . . . . . . . . . . . . . . . . . Internally Limited
θ
JA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75°C/W
Ambient Temperature Range . . . . . . . . . . . . –40°C to +85°C
Storage Temperature Range . . . . . . . . . . . . –65°C to +150°C
Lead Temperature Range (Soldering 10 sec) . . . . . . . +300°C
NOTES
*This is a stress rating only and functional operation of the device at these or any
other conditions above those indicated in the operation section of this specification
is not implied. Exposure to absolute maximum rating conditions for extended
periods may affect device reliability.
θ
JA
is specified for worst case conditions with device soldered on a circuit board.
Model
ADP3801AR
ADP3802AR
Package Option
R-16A
R-16A
Oscillator Frequency
200 kHz
500 kHz
PIN CONFIGURATION
DRV
1
RESET
2
VCC
3
VL
4
GND
A/B
BATA
16
ADP3801
ADP3802
15
14
13
BATB
TOP VIEW
SD
5
(Not to Scale)
12
PROG
CS–
6
11
10
9
ADJ
EOC
COMP
PIN FUNCTION DESCRIPTIONS
CS+
7
ISET
8
Pin
Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Mnemonic
DRV
RESET
VCC
VL
SD
CS–
CS+
ISET
COMP
EOC
ADJ
PROG
BATB
BATA
A/B
1
GND
Function
External Transistor Drive
Power on
RESET
Output
Supply Voltage
LDO Output
Shutdown Control Input
Negative Current Sense Input
Positive Current Sense Input
Charge Current Program Input
External Compensation Node
End-of-Charge Output Signal
Adjust Battery Voltage
±
10%
Program Final Battery Voltage Input
Battery “B” Voltage Sense
Battery “A” Voltage Sense
“A” or “B” Battery Select Input
Ground
NOTE
1
“L” = Battery “A.”
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 ADP3801/ADP3802 features proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precau-
tions are recommended to avoid performance degradation or loss of functionality.
WARNING!
ESD SENSITIVE DEVICE
–4–
REV. 0
Typical Performance Characteristics–ADP3801/ADP3802
100
VCC = 10V
T
A
= +25 C
0.4
VCC = 10V
0.3
0.3
0.2
V
BAT
ACCURACY – %
TOTAL NUMBEROF PARTS
80
T
A
= +25 C
V
BAT
= 4.2V
V
BAT
ACCURACY – %
0.2
0.1
0
–0.1
–0.2
–0.3
0.1
60
0
–0.1
40
20
–0.2
–0.3
6
8
10
12
14
16
18
SUPPLY VOLTAGE – Volts
20
0
–0.5
–0.1
–0.3
0.1
0.3
0.5
–0.4
–0.2
0
0.2
0.4
0.6
V
BAT
ACCURACY – %
–0.4
–40
–20
0
20
40
60
TEMPERATURE – C
80
100
Figure 2. V
BAT
Accuracy Distribution
Figure 3. V
BAT
Accuracy vs.
Temperature
Figure 4. V
BAT
Accuracy vs. Supply
Voltage
15
10
VCC = 10V
T
A
= +25 C
10
VCC = 10V
9
200
VCC = 10V
195
V
BAT
PERCENT CHANGE – %
THRESHOLD – %
5
8
0
–5
THRESHOLD – mV
–20
0
20
40
60
TEMPERATURE – C
80
100
190
7
185
–10
–15
0
0.5
1.0
2.0
2.5
V
ADJ
– Volts
1.5
3.0
3.5
6
5
–40
180
–40
–20
0
20
40
60
TEMPERATURE – C
80
100
Figure 5. V
BAT
Percent Change vs. V
ADJ
Figure 6. Overvoltage Comparator
Threshold vs. Temperature
Figure 7. Overcurrent Comparator
Threshold vs. Temperature
3.7
T
A
= +25 C
0.3
VCC = 10V
0.2
0.2
T
A
= +25 C
0.1
UVLO TRIP POINT – Votts
LDO ACCURACY – %
0.1
LDO ACCURACY – %
3.6
3.5
0
0
–0.1
3.4
–0.1
–0.2
3.3
0
1
2
3 4
5
6
7
8
LDO LOAD CURRENT – mA
9
10
–0.3
–40
–0.2
–20
0
20
40
60
TEMPERATURE – C
80
100
4
6
8
10 12 14 16 18
SUPPLY VOLTAGE – Volts
20
Figure 8. UVLO Trip Point-Off vs.
LDO Load Current
Figure 9. LDO Accuracy vs.
Temperature
Figure 10. LDO Accuracy vs. Supply
Voltage
REV. 0
–5–
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