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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

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MAX1909/MAX8725
Multichemistry Battery Chargers with
Automatic System Power Selector
Absolute Maximum Ratings
DCIN, CSSP, CSSN, SRC, ACOK to GND..............-0.3V to +30V
DHIV ........................................................…SRC + 0.3, SRC - 6V
DHI, PDL, PDS to GND ...............................-0.3V to (VSRC + 0.3)
BATT, CSIP, CSIN to GND .....................................-0.3V to +20V
CSIP to CSIN or CSSP to CSSN or PGND to GND ...-0.3V to +0.3V
CCI, CCS, CCV, DLO, IINP, REF,
ACIN to GND ........................................-0.3V to (VLDO + 0.3V)
DLOV, VCTL, ICTL, MODE, CLS, LDO,
PKPRES to GND ...................................................-0.3V to +6V
DLOV to LDO.........................................................-0.3V to +0.3V
DLO to PGND ..........................................-0.3V to (DLOV + 0.3V)
LDO Short-Circuit Current...................................................50mA
Continuous Power Dissipation (TA = +70°C)
28-Pin TQFN (derate 20.8mW/°C above +70°C) .......1666mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-60°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
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 = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
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 Default Threshold
VCTL Input Bias Current
CHARGE-CURRENT REGULATION
ICTL Range
CSIP-to-CSIN Full-Scale Current-
Sense Voltage
VVCTL = VLDO (3 or 4 cells, default
threshold of 4.2V/cell)
VVCTL rising
VVCTL = 3V
VDCIN = 0, VVCTL = 5V
-0.5
4.1
0
0
+0.5
4.3
2.5
12
V
µA
MAX1909
MAX8725
0 3.6
0 3.2
69.37 75.00 80.63
MAX1909: VICTL = 3.6V (not including ICTL
resistor tolerances)
MAX8725: VICTL = 3.2V (not including ICTL
resistor tolerances)
-7.5
-5
+7.5
+5
V
mV
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)
-7.5
+7.5
MAX8725: VICTL = 0.18V (not including
ICTL resistor tolerances)
-30
+30
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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
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Charge-Current Accuracy
MAX1909: VICTL = 3.6V x 0.5, MAX8725:
VICTL = 3.2V x 0.5 (including ICTL resistor
tolerances of 1%)
-7.0
+7.0
%
VICTL Default Threshold
BATT/CSIP/CSIN Input Voltage
Range
VICTL = VLDO (default threshold of 45mV)
-5
+5
VICTL rising
4.1 4.2 4.3
0 19
V
V
CSIP/CSIN Input Current
ICTL Power-Down Mode
Threshold Voltage
ICTL Power-Up Mode Threshold
Voltage
ICTL Input Bias Current
INPUT CURRENT REGULATION
CSSP-to-CSSN Full-Scale
Current-Sense Voltage
Input Current-Limit
Accuracy
CSSP/CSSN Input Voltage Range
CSSP/CSSN Input Current
CLS Input Range
CLS Input Bias Current
IINP Transconductance
Charging enabled
350 650
Charging disabled; VDCIN = 0 or VICTL = 0
0.1 1
MAX1909
0.75
MAX8725
0.06
MAX1909
0.85
MAX8725
0.11
VICTL = 3V
VDCIN = 0V, VICTL = 5V
-1 +1
-1 +1
µA
V
V
µA
VCLS = REF
VCLS = REF x 0.75
VCLS = REF x 0.5
VCSSP = VCSSN = VDCIN > 8.0V
VDCIN = 0
VCLS = 2.0V
VCSSP - VCSSN = 56mV
VCSSP - VCSSN = 75mV, terminated with
10kΩ
72.75 75.00 77.25
-3 +3
-3 +3
-4 +4
8.0 28
450 730
0.1 1
1.6 REF
-1 +1
2.7 3.0 3.3
-7.5 +7.5
mV
%
V
µA
V
µA
mA/V
IINP Accuracy
VCSSP - VCSSN = 56mV, terminated with
10kΩ
-5
+5 %
IINP Output Current
IINP Output Voltage
VCSSP - VCSSN = 20mV, terminated with
10kΩ
VCSSP - VCSSN = 150mV, VIINP = 0V
VCSSP - VCSSN = 150mV, VIINP = float
-10
350
3.5
+10
µA
V
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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
SYMBOL
SUPPLY AND LINEAR REGULATOR
DCIN Input Voltage Range
VDCIN
DCIN Undervoltage-Lockout Trip
Point
DCIN Quiescent Current
IDCIN
BATT Input Current
IBATT
LDO Output Voltage
LDO Load Regulation
LDO Undervoltage-Lockout Trip
Point
REFERENCE
REF Output Voltage
REF Undervoltage-Lockout Trip
Point
TRIP POINTS
BATT POWER_FAIL Threshold
BATT POWER_FAIL Threshold
Hysteresis
ACIN Threshold
ACIN Threshold Hysteresis
ACIN Input Bias Current
SWITCHING REGULATOR
DHI Off-Time
DHI Minimum Off-Time
DLOV Supply Current
Sense Voltage for Minimum
Discontinuous Mode Ripple
Current
Ref
IDLOV
CONDITIONS
DCIN falling
DCIN rising
8.0V < VDCIN < 28V
VBATT = 19V, VDCIN = 0V, or ICTL = 0V
VBATT = 16.8V, VDCIN = 19V, ICTL = 0V
VBATT = 2V to 19V, VDCIN > VBATT + 0.3V
8.0V < VDCIN < 28V, no load
0 < ILDO < 10mA
VDCIN = 8.0V
0 < IREF < 500µA
REF falling
VDCIN - VBATT, VDCIN falling
ACIN rising
VACIN = 2.048V
VBATT = 16.0V, VDCIN = 19V, VMODE = 3.6V
VBATT = 16.0V, VDCIN = 17V, VMODE = 3.6V
DLO low
MIN TYP MAX UNITS
8.0 28
7 7.4
7.5 7.85
2.7 6
0.1 1
0.1 1
200 500
5.25 5.4 5.55
80 115
3.20 4 5.15
V
V
mA
µA
V
mV
V
4.2023 4.2235 4.2447
3.1 3.9
V
V
50 100 150
100 200 300
2.007
10
-1
2.048
20
2.089
30
+1
mV
mV
V
mV
µA
360 400 440
260 300 350
5 10
ns
ns
µA
7.5 mV
Cycle-by-Cycle Current-Limit
Sense Voltage
97 mV
Sense Voltage for Battery
Undervoltage Charge Current
MAX1909 only, BATT = 3.0V per cell
3 4.5 6 mV
Battery Undervoltage Threshold
DHIV Output Voltage
MAX1909 only, MODE = float (3 cell),
VBATT rising
MAX1909 only, MODE = LDO (4 cell),
VBATT rising
With respect to SRC
9.18 9.42
12.235
12.565
-4.5 -5.0 -5.5
V
V
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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
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