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PDF 1909ETI Data sheet ( Hoja de datos )

Número de pieza 1909ETI
Descripción MAX1909ETI
Fabricantes Maxim Integrated Products 
Logotipo Maxim Integrated Products Logotipo



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19-2805; Rev 2; 9/04
EVALUATION
KIT
AVAILABLE
www.DataSheet4U.com
Multichemistry Battery Chargers with Automatic
System Power Selector
General Description
The MAX1909/MAX8725 highly integrated control ICs
simplify construction of accurate and efficient multi-
chemistry battery chargers. The MAX1909/MAX8725
use analog inputs to control charge current and volt-
age, and can be programmed by a host microcontroller
(µC) or hardwired. High efficiency is achieved through
use of buck topology with synchronous rectification.
The maximum current drawn from the AC adapter is pro-
grammable to avoid overloading the AC adapter when
supplying the load and the battery charger simultane-
ously. The MAX1909/MAX8725 provide a digital output
that indicates the presence of an AC adapter, and an
analog output that monitors the current drawn from the
AC adapter. Based on the presence or absence of the
AC adapter, the MAX1909/MAX8725 automatically select
the appropriate source for supplying power to the sys-
tem by controlling two external p-channel MOSFETs.
Under system control, the MAX1909/MAX8725 allow the
battery to undergo a relearning or conditioning cycle in
which the battery is completely discharged through the
system load and then recharged.
The MAX1909 includes a conditioning charge feature
while the MAX8725 does not. The MAX1909/MAX8725
are available in space-saving 28-pin, 5mm 5mm thin
QFN packages and operate over the extended -40°C to
+85°C temperature range. The MAX1909/MAX8725 are
now available in lead-free packages.
Applications
Notebook and Subnotebook Computers
Hand-Held Data Terminals
Pin Configuration
TOP VIEW
28 27 26 25 24 23 22
DCIN 1
LDO 2
ACIN 3
REF 4
GND/PKPRES 5
ACOK 6
MODE 7
MAX1909
MAX8725
21 DLOV
20 DLO
19 PGND
18 CSIP
17 CSIN
16 BATT
15 GND
8 9 10 11 12 13 14
THIN QFN
Features
±0.5% Accurate Charge Voltage (0°C to +85°C)
±3% Accurate Input Current Limiting
±5% Accurate Charge Current
Programmable Charge Current >4A
Automatic System Power-Source Selection
Analog Inputs Control Charge Current and
Charge Voltage
Monitor Outputs for
Current Drawn from AC Input Source
AC Adapter Presence
Up to 17.65V (max) Battery Voltage
Maximum 28V Input Voltage
Greater than 95% Efficiency
Charge Any Battery Chemistry: Li+, NiCd, NiMH,
Lead Acid, etc.
Ordering Information
PART
TEMP RANGE
MAX1909ETI
-40°C to +85°C
MAX1909ETI+
-40°C to +85°C
MAX8725ETI
-40°C to +85°C
MAX8725ETI+
-40°C to +85°C
+Denotes lead-free package.
PIN-PACKAGE
28 Thin QFN
28 Thin QFN
28 Thin QFN
28 Thin QFN
Minimum Operating Circuit
AC ADAPTER: INPUT
P3
0.01
CSSP
PDS
SRC
DCIN
CSSN
DHIV
PDL
VCTL
MAX1909
MAX8725
LDO
LDO ICTL
MODE
DLOV
ACIN
LDO IINP IINP
REF CLS
DHI
ACOK
LDO
DLO
MAX8725 ONLY
PKPRES
PGND
CSIP
CCV
CSIN
CCI
BATT
CCS REF GND
TO
EXTERNAL LOAD
SRC
P2
P1
N1 10µH
0.015
Functional Diagrams appear at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

1 page




1909ETI pdf
www.DataSheet4U.com
Multichemistry Battery Chargers with Automatic
System Power Selector
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, VDCIN = VCSSP = VCSSN = 18V, VBATT = VCSIP = VCSIN = 12V, VVCTL = VICTL = 1.8V, MODE = float, ACIN = 0, CLS =
REF, GND = PGND = 0, PKPRES = GND, LDO = DLOV, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
DHIV Sink Current
10 mA
DHI On-Resistance Low
DHI On-Resistance High
DLO On-Resistance High
DLO On-Resistance Low
ERROR AMPLIFIERS
DHI = VDHIV, IDHI = -10mA
DHI = VCSSN, IDHI = 10mA
VDLOV = 4.5V, IDLO = +100mA
VDLOV = 4.5V, IDLO = -100mA
25
24
37
13
GMV Loop Transconductance
VCTL = 3.6, VBATT = 16.8V, MODE = LDO
VCTL = 3.6, VBATT = 12.6V, MODE = FLOAT
0.0625 0.125 0.2500
mA/V
0.0833 0.167 0.3330
GMI Loop Transconductance
MAX1909: ICTL = 3.6V, MAX8725: VICTL =
3.2V, VCSSP - VCSIN = 75mV
0.5
1
2 mA/V
GMS Loop Transconductance
VCLS = 2.048V, VCSSP - VCSSN = 75mV
0.5 1
2 mA/V
CCI/CCS/CCV Clamp Voltage
LOGIC LEVELS
0.25V < VCCV < 2.0V, 0.25V < VCCI < 2.0V,
150
300
600
0.25V < VCCS < 2.0V
mV
MODE Input Low Voltage
0.8 V
MODE Input Middle Voltage
MODE Input High Voltage
1.6 1.8 2.0
2.8
V
V
MODE Input Bias Current
ACOK AND PKPRES
MODE = 0V or 3.6V
-2 +2 µA
ACOK Input Voltage Range
0 28 V
ACOK Sink Current
ACOK Leakage Current
PKPRES Input Voltage
Range
PKPRES Input Bias Current
VACOK = 0.4V, ACIN = 1.5V
VACOK = 28V, ACIN = 2.5V
1 mA
1 µA
0
LDO
V
-1 +1 µA
PKPRES Battery Removal Detect
Threshold
MAX8725, PKPRES rising
55
% of
LDO
PKPRES Hysteresis
MAX8725
1%
PDS, PDL SWITCH CONTROL
PDS Switch Turn-Off Threshold
PDS Switch Threshold Hysteresis
VDCIN - VBATT, VDCIN falling
VDCIN - VBATT
50 100 150
100 200 300
mV
mV
PDS Output Low Voltage, PDS
Below SRC
IPDS = 0A
8 10 12 V
PDS Turn-On Current
PDS = SRC
6 12
mA
PDS Turn-Off Current
PDL Switch Turn-On Threshold
PDL Switch Threshold Hysteresis
VPDS = VSRC - 2V, VDCIN = 16V
VDCIN - VBATT, VDCIN falling
VDCIN - VBATT
10 50
50 100 150
100 200 300
mA
mV
mV
_______________________________________________________________________________________ 5

5 Page





1909ETI arduino
www.DataSheet4U.com
Multichemistry Battery Chargers with Automatic
System Power Selector
Typical Operating Characteristics (continued)
(Circuit of Figure 2, VDCIN = 20V, charge current = 3A, 4 Li+ series cells, TA = +25°C, unless otherwise noted.)
SWITCHING FREQUENCY vs. VIN - VBATT
500
450
400
350
300
250
200
150
100
50
0
0 2 4 6 8 10
VIN - VBATT (V)
IINP ACCURACY vs. INPUT CURRENT
8
6
4
2
0
-2
-4
-6
-8
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
INPUT CURRENT (A)
INPUT CURRENT-LIMIT ACCURACY
vs. SYSTEM LOAD
4
3
2
1 VBATT = 16V VBATT = 12V
0
-1
-2
0
VBATT = 13V
VBATT = 10V
0.5 1.0 1.5 2.0 2.5 3.0 3.5
SYSTEM LOAD (A)
IINP ERROR vs. INPUT CURRENT
4.0
3.5
CHARGER
3.0 DISABLED
2.5
2.0
1.5
1.0
0.5
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5
INPUT CURRENT (A)
INPUT CURRENT-LIMIT ACCURACY
vs. SYSTEM LOAD
4
VBATT = 13V
3 VBATT = 10V
2
1
VBATT = 16V
0 VBATT = 12V
ICHARGE = 3A
-1
MAX1909 ONLY
-2
0.5 1.0 1.5
2.0
SYSTEM LOAD (A)
2.5
3.0
INPUT CURRENT-LIMIT ACCURACY vs. VCLS
3
2
1
0
-1
-2
-3
1.5
2.0 2.5 3.0
VCLS (V)
3.5
______________________________________________________________________________________ 11

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