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ADP3801_15

Description
High Frequency Switch Mode Dual Li-Ion Battery Chargers
File Size258KB,20 Pages
ManufacturerADI
Websitehttps://www.analog.com
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ADP3801_15 Overview

High Frequency Switch Mode Dual Li-Ion Battery Chargers

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

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