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1909ETI Schematic ( PDF Datasheet ) - Maxim Integrated Products

Teilenummer 1909ETI
Beschreibung MAX1909ETI
Hersteller Maxim Integrated Products
Logo Maxim Integrated Products Logo 




Gesamt 30 Seiten
1909ETI Datasheet, Funktion
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.






1909ETI Datasheet, Funktion
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
PDL Turn-On Resistance
PDL Turn-Off Current
SRC Input Bias Current
PDL = GND
VSRC - VPDL = 1.5V
SRC = 19V, DCIN = 0V
SRC = 19, VBATT = 16V
50 100 150 k
6 12
mA
1
450 1000
µA
Delay Time Between PDL and
PDS Transitions
2.5 5 7.5 µs
ELECTRICAL CHARACTERISTICS
(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 = -40°C to +85°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
CHARGE VOLTAGE REGULATION
VCTL Range
0 3.6 V
VVCTL = 3.6V (3 or 4 cells); not including
VCTL resistor tolerances
-0.8
+0.8
Battery Regulation Voltage
Accuracy
VVCTL = 3.6V/20 (3 or 4 cells); not including
VCTL resistor tolerances
VVCTL = 3.6V (3 or 4 cells); including VCTL
resistor tolerances of 1%
-0.8
-1.0
+0.8
+1.0
%
VVCTL = VLDO (3 or 4 cells, default
threshold of 4.2V/cell)
-0.8
+0.8
VVCTL Default Threshold
VCTL Input Bias Current
CHARGE-CURRENT REGULATION
ICTL Range
VVCTL rising
VVCTL = 3V
VDCIN = 0V, VVCTL = 5V
MAX1909
MAX8725
4.1 4.3 V
0 2.5
µA
0 12
0 3.6
V
0 3.2
CSIP-to-CSIN Full-Scale Current-
Sense Voltage
69.37
80.63 mV
MAX1909: VICTL = 3.6V (not including ICTL
resistor tolerances)
-7.5
+7.5
MAX8725: VICTL = 3.2V (not including ICTL
resistor tolerances)
-5
+5
Charge-Current Accuracy
MAX1909: VICTL = 3.6V x 0.5, MAX8725:
VICTL = 3.2V x 0.5 (not including ICTL
resistor tolerances)
-5
+5 %
MAX1909: VICTL = 0.9V (not including ICTL
resistor tolerances)
MAX8725: VICTL = 0.18V (not including
ICTL resistor tolerances)
-7.5
-30
+7.5
+30
6 _______________________________________________________________________________________

6 Page









1909ETI pdf, datenblatt
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.)
PDL-PDS SWITCHING,
AC ADAPTER INSERTION
MAX1909/MAX8725 toc15
VPDS
SYSTEM LOAD
VPDL
VPDL
100µs/div
20V
VWALLADAPTER
10V
20V
VSYSTEMLOAD, VPDS
10V
VPDS
20V
VPDL, VBATT
10V
0V
PDS-PDL SWITCHOVER,
BATTERY INSERTION
20VMAX1909/MAX8725 toc17
VPDS
15V
VSYSTEM
CONDITIONING MODE 10V
WALL ADAPTER = 18V
5V VPKDET
0V
VPKPRES
15V
VBATT
10V
50µs/div
5V VPDL
0V
PDS-PDL SWITCHOVER,
WALL ADAPTER REMOVAL
20VMAX1909/MAX8725 toc16
VSYSTEMLOAD
10V
VPDS
20V
VWALLADAPTER
10V
0V
VPDL 20V
VBATT
10V
VPDL
0V
500µs/div
VSYSTEMLOAD
PDL-PDS SWITCHING,
BATTERY REMOVAL
20VMAX1909/MAX8725 toc18
VSYSTEM
CONDITIONING MODE 15V
WALL ADAPTER = 18V
10V
VPDS
5V
VPKPRES
0V
VPDL
15V
VBATT
10V
MAX8725 ONLY
5V
10µs/div
0V
12 ______________________________________________________________________________________

12 Page





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