ADP3804 Просмотр технического описания (PDF) - Analog Devices
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ADP3804 Datasheet PDF : 7 Pages
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Preliminary Technical Data
High Frequency Switch Mode
Li-Ion Battery Charger
ADP3804
FEATURES
GENERAL DESCRIPTION
Li-Ion Battery Charger
The ADP3804 is a complete Li-Ion battery charging IC. The
Fixed 12,525 V, 12.600 V, or Adjustable Battery
device combines high output voltage accuracy with constant
Voltage
current control to simplify the implementation of Constant-
High End-of-Charge Voltage Accuracy
Current, Constant-Voltage (CCCV) chargers. The ADP3804 is
؎0.4% @ +25؇C
؎0.6% @ 5؇C to 55؇C
Y ؎0.75% @ 0؇C to 85؇C
R Programmable Charge Current with
A Rail-to-Rail Sensing
System Current Sense with Reverse Input Protection
IN Softstart Charge Current
L Undervoltage Lockout
IM A Boosted Synchronous Drive For External NMOS
EL IC Programmable Oscillator Frequency
Oscillator SYNC Pin
R N Constant Current/Constant Voltage Flag
P H Trickle Charge
TEC TA APPLICATIONS
DA Portable Computers
available in two options. The ADP3804-12.6 guarantees the
final battery voltage to 12.6 V ± 0.6%, the ADP3804-12.5
guarantees 12.525 V ± 0.6% and the ADP3804 is adjustable
using two external resistors to set the battery voltage. The
current sense amplifier has rail-to-rail inputs to accurately
operate under low drop out and short circuit conditions. The
charge current is programmable with a DC voltage on ISET. A
second differential amplifier senses the system current across an
external sense resistor and outputs a linear voltage on the ISYS
pin. The boosted synchronous driver allows the use of two
NMOS transistors for lower system cost.
Fast Chargers
FUNCTIONAL BLOCK DIAGRAM
VCC BSTREG
BST DRVH SW DRVL PGND
CS+ CS SYS+ SYS
REG
REF
SD
BOOST
REGULATOR
+
SUPPLY
REGULATOR
REFERENCE
+
BIAS
ADP3804
AGND
BOOSTED
SYNCHRONOUS
DRIVER
AMP
1
AMP
2
UVLO
VREF
OSCILLATOR
gm1
gm2
INPUT
DIVIDER
ADP3804-12.6
ADP3804-12.5
VREF
BATTERY
ADJUST
SYNC
CT COMP CCCV
LIMIT
ISYS
ISET
BAT
ADJ
REV. PrI
12/5/00
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., 2000
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