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PDF MAX1909 Data sheet ( Hoja de datos )
| Número de pieza | MAX1909 | |
| Descripción | (MAX8725 / MAX1909) Multichemistry Battery Charger | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX1909 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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MAX1909/MAX8725
EVALUATION KIT AVAILABLE
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
system 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
Functional Diagrams appear at end of data sheet.
Benefits and Features
• Precise Measurement Improves Safety and
Performance
• ±0.5% Accurate Charge Voltage (0°C to +85°C)
• ±3% Accurate Input Current Limiting
• ±5% Accurate Charge Current
• Analog Inputs Control Charge Current and Charge
Voltage
• Charge Any Battery Chemistry: Li+, NiCd, NiMH,
Lead Acid, etc.
• Up to 17.65V (max) Battery Voltage
• Maximum 28V Input Voltage
• Programmable Charge Current > 4A
• Intelligent AC Adapter Interface Makes Design Easier
• Automatic System Power/Source Selection
• Analog Monitoring of Current Drawn from AC Input
Source
• Digital Output Indicates AC Adapter Presence
• Greater than 95% Efficiency Extends Battery Life
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX1909ETI
-40°C to +85°C
28 Thin QFN
MAX1909ETI+
-40°C to +85°C
28 Thin QFN
MAX8725ETI
-40°C to +85°C
28 Thin QFN
MAX8725ETI+
-40°C to +85°C
28 Thin QFN
+Denotes a lead(Pb)-free/RoHS-compliant package.
Minimum Operating Circuit
AC ADAPTER: INPUT
P3
0.01Ω
CSSP
CSSN
PDS DHIV
SRC PDL
DCIN
MAX1909
VCTL 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
0.015Ω
19-2805; Rev 3; 5/15
1 page  
MAX1909/MAX8725
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
DHIV Sink Current
DHI On-Resistance Low
DHI On-Resistance High
DLO On-Resistance High
DLO On-Resistance Low
ERROR AMPLIFIERS
GMV Loop Transconductance
GMI Loop Transconductance
GMS Loop Transconductance
CCI/CCS/CCV Clamp Voltage
LOGIC LEVELS
MODE Input Low Voltage
MODE Input Middle Voltage
MODE Input High Voltage
MODE Input Bias Current
ACOK AND PKPRES
ACOK Input Voltage Range
ACOK Sink Current
ACOK Leakage Current
PKPRES Input Voltage
Range
PKPRES Input Bias Current
SYMBOL
CONDITIONS
DHI = VDHIV, IDHI = -10mA
DHI = VCSSN, IDHI = 10mA
VDLOV = 4.5V, IDLO = +100mA
VDLOV = 4.5V, IDLO = -100mA
MIN TYP MAX UNITS
10 mA
25Ω
24Ω
37Ω
13Ω
VCTL = 3.6, VBATT = 16.8V, MODE = LDO
VCTL = 3.6, VBATT = 12.6V, MODE = FLOAT
MAX1909: ICTL = 3.6V, MAX8725: VICTL =
3.2V, VCSSP - VCSIN = 75mV
VCLS = 2.048V, VCSSP - VCSSN = 75mV
0.25V < VCCV < 2.0V, 0.25V < VCCI < 2.0V,
0.25V < VCCS < 2.0V
0.0625 0.125 0.2500
0.0833 0.167 0.3330
0.5 1
2
0.5 1
2
150 300 600
mA/V
mA/V
mA/V
mV
MODE = 0V or 3.6V
0.8
1.6 1.8 2.0
2.8
-2 +2
V
V
V
µA
VACOK = 0.4V, ACIN = 1.5V
VACOK = 28V, ACIN = 2.5V
0 28 V
1 mA
1 µA
0
LDO
V
-1 +1 µA
PKPRES Battery Removal Detect
Threshold
PKPRES Hysteresis
PDS, PDL SWITCH CONTROL
PDS Switch Turn-Off Threshold
PDS Switch Threshold Hysteresis
PDS Output Low Voltage, PDS
Below SRC
MAX8725, PKPRES rising
MAX8725
VDCIN - VBATT, VDCIN falling
VDCIN - VBATT
IPDS = 0A
55
1
% of
LDO
%
50 100 150
100 200 300
8 10 12
mV
mV
V
PDS Turn-On Current
PDS Turn-Off Current
PDL Switch Turn-On Threshold
PDL Switch Threshold Hysteresis
PDS = SRC
VPDS = VSRC - 2V, VDCIN = 16V
VDCIN - VBATT, VDCIN falling
VDCIN - VBATT
6 12
10 50
50 100 150
100 200 300
mA
mA
mV
mV
www.maximintegrated.com
Maxim Integrated | 5
5 Page 
MAX1909/MAX8725
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
www.maximintegrated.com
Maxim Integrated | 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MAX1909.PDF ] | |
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