MAX8725ETI ,28 V, multichemistry battery charger with automatic system power selectorFeatures♦ ±0.5% Accurate Charge Voltage (0°C to +85°C)The MAX1909/MAX8725 highly integrated control ..
MAX8725ETI+ ,Multichemistry Battery Chargers with Automatic System Power SelectorApplicationsNotebook and Subnotebook Computers Minimum Operating CircuitHand-Held Data TerminalsP3T ..
MAX8725ETI+ ,Multichemistry Battery Chargers with Automatic System Power SelectorElectrical Characteristics(Circuit of Figure 1, V = V = V = 18V, V = V = V = 12V, V = V = 1.8V, MOD ..
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MAX8725ETI
28 V, multichemistry battery charger with automatic system power selector
General DescriptionThe 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.
ApplicationsNotebook and Subnotebook Computers
Hand-Held Data Terminals
Features±0.5% Accurate Charge Voltage (0°C to +85°C)±3% Accurate Input Current Limiting±5% Accurate Charge CurrentProgrammable Charge Current >4AAutomatic System Power-Source SelectionAnalog Inputs Control Charge Current andCharge VoltageMonitor Outputs for
Current Drawn from AC Input SourceAC Adapter PresenceUp to 17.65V (max) Battery VoltageMaximum 28V Input VoltageGreater than 95% EfficiencyCharge Any Battery Chemistry: Li+, NiCd, NiMH,Lead Acid, etc.
MAX1909/MAX8725
Multichemistry Battery Chargers with Automatic
System Power Selector
Ordering Information
Pin Configuration
Minimum Operating Circuit
MAX1909/MAX8725
Multichemistry Battery Chargers with Automatic
System Power Selector
ABSOLUTE MAXIMUM RATINGS
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.)
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.
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, PKPRESto 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
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.)
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.)
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.)
