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PDF ADP3804JRU Data sheet ( Hoja de datos )
| Número de pieza | ADP3804JRU | |
| Descripción | High Frequency Switch Mode Li-Ion Battery Charger | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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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
RProgrammable Charge Current with
ARail-to-Rail Sensing
System Current Sense with Reverse Input Protection
INSoftstart Charge Current
LUndervoltage Lockout
IM ABoosted Synchronous Drive For External NMOS
EL ICProgrammable Oscillator Frequency
Oscillator SYNC Pin
R NConstant Current/Constant Voltage Flag
P HTrickle Charge
TEC TAAPPLICATIONS
DAPortable 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
1 page  
ADP3804
VIN
C14
2.2µF
Q1
IRF7807
R13
10Ω C15 +
220µ F
C9
0.1µF
VCC BST DRVH SW
L1
Q2
22µ H
C16
+
IRF7807D2 220µF
DRVL PGND
CS+
RCS
50mΩ
R3
249Ω
C13
22nF
CS-
RSS1
10mΩ
R4
249Ω
C1
470nF
R1
10Ω
SYS+ SYS-
SYSTEM
DC/DC
R2
10Ω
C2
470nF
ISYS
BATTERY
12.6V
BOOSTED
SYNCHRONOUS
DRIVER
+
AMP
1
AMP+
2
BSTREG
7.0V
C10
0.1µF
VREF + VREG
UVLO
BIAS
VREF
gm1
SD LOGIC
CONTROL
RYCCCV
A**R7
IN L100k ADP3804
LIM ICAAGND
OSCILLATOR
gm2
REG
6.0V
REF
2.5V
SYNC
C7
200pF
CT
C6
200pF
COMP
C8
1µF
R8
56Ω
VREF
ADJ
RE NC17
P H100nF
C A* ADP3804-12.6: R11 = SHORT, R12 = OPEN
TE DAT** R7, OPEN IF CCCV FUNCTION IS NOT USED
Figure 1. Typical Application
2.5V
ADP3804-12.6
SD
LIMIT
ISET
BAT
ADP3804-12.5
R5
6.81kΩ
R6
7.5kΩ
*R11
412k
0.1%
*R12
102k
0.1%
THEORY OF OPERATION
The ADP3804 combines a boosted synchronous switching
driver with programmable current control and accurate final
battery voltage control in a Constant Current, Constant Volt-
age (CCCV) Li-Ion battery charger. High accuracy voltage
control is needed to safely charge Li-Ion batteries, which are
typically specified at 4.2 V ± 1% per cell. For a typical note-
book computer battery pack, three cells are in series giving a
total voltage of 12.6 V. The ADP3804 is available in three
versions, a fixed 12.525 V output, a fixed 12.6 V output and an
adjustable output. The adjustable output is useful for charging
batteries with slightly different chemistry that result in a final
battery voltage slightly higher or lower than 4.2 V/ cell.
Another requirement for safely charging Li-Ion batteries is
accurate control of the charge current. The actual charge cur-
rent depends on the number of cells in parallel within the bat-
tery pack. Typically this is in the range of 2 A to 3 A. The
ADP3804 provides flexibility in programming the charge cur-
rent over a wide range. An external resistor is used to sense the
charge current and this voltage is compared to a DC input
voltage. This programmability allows the current to be changed
during charging. For example, the charge current can be re-
duced for trickle charging.
The synchronous driver provides high efficiency when charging
at high currents. Efficiency is important mainly to reduce the
amount of heat generated in the charger, but also to stay within
the power limits of the AC adapter. With the addition of a
boosted high side driver, the ADP3804 drives two external
power NMOS transistors for a simple, lower cost power stage.
The ADP3804 also provides an uncommitted current sense
amplifier. This amplifier provides an analog output pin for
monitoring the current through an external sense resistor. The
amplifier can be used anywhere in the system that high side
current sensing is needed.
Charge Current Control
AMP1 in Figure 1 has a differential input to amplify the voltage
drop across an external sense resistor RCS. The input common
mode range is from ground to VCC allowing current control in
short circuit and low drop-out conditions. The gain of AMP1 is
internally set to 25 V/V for low voltage drop across the sense
resistor. During CC mode, gm1 forces the voltage at the output
of AMP1 to be equal to the external voltage at the ISET pin.
By choosing RCS and VISET appropriately, a wide range of
charge currents can be programmed:
ICHARGE
=
VISET
25×RCS
(1)
REV. PrI
–5–
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| PDF Descargar | [ Datasheet ADP3804JRU.PDF ] | |
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