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부품번호 ADP3802AR 기능
기능 High Frequency Switch Mode Dual Li-Ion Battery Chargers
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ADP3802AR 데이터시트, 핀배열, 회로
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
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.
High Frequency Switch Mode
Dual Li-Ion Battery Chargers
ADP3801/ADP3802
FUNCTIONAL BLOCK DIAGRAM
VCC
DRV EOC CS+ CS– A/B
VL
SD
RESET
LDO +
GATE
REFERENCE DRIVE
CURRENT
LOOP
AMP + EOC
COMPARATOR
A/B
SELECT
MUX
SHUTDOWN
UVLO
+
RESET
PWM
SD\UVLO
ADP3801/ADP3802
FINAL BATTERY
VOLTAGE
PROGRAM
(4.2, 8.4, 12.6)
VOLTAGE
LOOP
AMP
BATTERY
VOLTAGE
ADJUST
؎10%
BATA
BATB
ISET
PROG
GND
COMP
ADJ
68H
40m
VIN
3.3V
VCC DRV
VL
EOC
CS+ CS–
A/B
BATA
SD
RESET
ADP3801/ADP3802
BATB
ISET
PROG
GND
COMP
ADJ
BATA
BATB
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




ADP3802AR pdf, 반도체, 판매, 대치품
ADP3801/ADP3802
ABSOLUTE MAXIMUM RATINGS*
Input Voltage (VCC to GND) . . . . . . . . . . . . . . –0.3 V to 20 V
DRV, VCS+, VCS– 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
θJA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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.
θJA is specified for worst case conditions with device soldered on a circuit board.
PIN FUNCTION DESCRIPTIONS
Pin
Number Mnemonic
1 DRV
2 RESET
3 VCC
4 VL
5 SD
6 CS–
7 CS+
8 ISET
9 COMP
10 EOC
11 ADJ
12 PROG
13 BATB
14 BATA
15 A/B1
16 GND
NOTE
1“L” = Battery “A.”
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
ORDERING GUIDE
Model
ADP3801AR
ADP3802AR
Package Option
R-16A
R-16A
Oscillator Frequency
200 kHz
500 kHz
PIN CONFIGURATION
DRV 1
RESET 2
VCC 3
16 GND
ADP3801 15 A/B
ADP3802 14 BATA
VL 4
13 BATB
TOP VIEW
SD 5 (Not to Scale) 12 PROG
CS– 6
11 ADJ
CS+ 7
10 EOC
ISET 8
9 COMP
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

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ADP3802AR 전자부품, 판매, 대치품
ADP3801/ADP3802
APPLICATIONS SECTION
PRODUCT DESCRIPTION
The ADP3801 and ADP3802 are complete Li-Ion battery charg-
ing ICs. Combined with a microcontroller, they also function as
voltage limited, µC programmable constant current source chargers
for NiCad and NiMH chemistries. Utilizing an external PMOS
pass transistor, the devices realize a buck type constant current,
constant voltage (CCCV) charger controller that is capable of
charging two separate battery packs for such applications as
portable computer chargers and cellular phone chargers. The
Functional Block Diagram shows the ICs’ functional blocks,
which are detailed below:
• A/B SELECT MUX—Two-channel multiplexer for charging
two battery stacks.
• FINAL BATTERY VOLTAGE PROGRAM—Multiplexer to
program 4.2 V, 8.4 V, or 12.6 V final battery voltage.
• VOLTAGE LOOP AMP—GM-type amplifier to control
the final battery voltage. It includes a built-in overvoltage
comparator.
EOC COMPARATOR—End-of-charge detection output to
signal when the battery is fully charged.
• BATTERY VOLTAGE ADJUST—Amplifier to adjust the
final battery voltage up to ± 10%.
• CURRENT LOOP AMP—High-side-current-sense amplifier
to sense and control the charge current at a programmable
level. It includes an overcurrent comparator.
• PWM—Pulsewidth modulator and oscillator (ADP3801-
200 kHz, ADP3802-500 kHz).
• GATE DRIVE—Gate drive to control an external pass tran-
sistor. It includes a clamp to limit the drive voltage to protect
the external PMOS.
• LDO + REFERENCE—3.3 V low dropout regulator to sup-
ply an external microcrontroller and for on-chip supply. In-
cludes an internal precision reference ( VREF = VL/2).
• SHUTDOWN—Logic input to shut down the charger. The
LDO remains on.
• UVLO—Undervoltage lockout circuit to shut down the charger
for low supply voltages.
• RESET—Active LOW output to reset external logic on power-
up.
During charging, the ADP3801/ADP3802 maintains a constant,
programmable charge current. The high side current sense
amplifier has low offset allowing the use of a low voltage drop
for current sensing: 165 mV for the maximum charge current.
The input common-mode range extends from ground to
VCC – 2 V ensuring current control over the full charging volt-
age of the battery, including a short circuit condition. A high
impedance dc voltage input (ISET) is provided for program-
ming the charge current over a wide range. When the battery
voltage approaches its final limit, the part automatically trans-
fers to voltage control mode. Both the current control loop and
the voltage control loop share the same compensation pin mini-
mizing the number of external components. An internal com-
parator monitors the charge current to detect the end-of-charge
(EOC). When the current decreases such that VCS 8 mV, the
EOC output pulls low.
A 3.3 V LDO is used to generate a regulated supply for internal
circuitry. Additionally, the LDO can deliver up to 10 mA of
current to power external circuitry such as a microcontroller. An
Undervoltage Lockout (UVLO) circuit is included to safely shut
down the charging circuitry when the input voltage drops below
its minimum rating. A shutdown pin is also provided to turn off
the charger when, for example, the battery has been fully charged.
The LDO remains active during shutdown or UVLO and has a
quiescent current of 110 µA.
Battery Charging Overview
Figure 20 shows a simplified Buck type battery charger applica-
tion circuit for the ADP3801/ADP3802. When a discharged
battery is first placed in the charger, the battery voltage is well
below the final charge voltage, so the current sense amplifier
controls the charge loop in constant current mode. The charge
current creates a voltage drop across the sense resistor RCS. This
voltage drop is buffered and amplified by amplifier GM1. Am-
plifier GM2 compares the output of GM1 to an external current
control voltage provided at the ISET pin and servos the charger
loop to make these voltages equal. Thus, the charge current is
programmed using the ISET input voltage.
The output of GM2 is analog “OR’ed” with the output of GM3,
the voltage loop amplifier. Only one or the other amplifier con-
trols the charge loop at any given time. As the battery voltage
approaches its final voltage, GM3 comes into balance. As this
occurs, the charge current decreases, unbalancing GM2, and
control of the feedback loop naturally transfers to GM3.
The ADP3801/ADP3802 can control the charging of two inde-
pendent battery stacks or a single battery stack. The A/B SELECT
MUX has a logic input to choose between the two batteries. See
Figure 31 for more information on dual battery charging. The
output of the multiplexer is applied to a precision thin-film
resistor string to divide down the battery voltage. The final
battery voltage is chosen by selecting the proper resistor divider
tap with the PROG multiplexer. The output of this mux goes
directly to the input of GM3, comparing the divided down
battery voltage to the internal reference. To guarantee ± 0.75%
accuracy, a high precision internal reference and high accuracy
thin film resistors are used. Including these components on-
chip saves the significant cost and design effort of adding them
externally.
REV. 0
–7–

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부품번호상세설명 및 기능제조사
ADP3802AR

High Frequency Switch Mode Dual Li-Ion Battery Chargers

Analog Devices
Analog Devices

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