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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 ..
MB84VD21183EM-70PBS , Stacked MCP (Multi-Chip Package) FLASH MEMORY & SRAM CMOS
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MAX1908ETI-MAX8724ETI
Low-Cost Multichemistry Battery Chargers
General DescriptionThe MAX1908/MAX8724 highly integrated, multichemistry
battery-charger control ICs simplify the construction of
accurate and efficient chargers. These devices use ana-
log inputs to control charge current and voltage, and can
be programmed by the host or hardwired. The MAX1908/
MAX8724 achieve high efficiency using a buck topology
with synchronous rectification.
The MAX1908/MAX8724 feature input current limiting.
This feature reduces battery charge current when the
input current limit is reached to avoid overloading the AC
adapter when supplying the load and the battery charger
simultaneously. The MAX1908/MAX8724 provide outputs
to monitor current drawn from the AC adapter (DC input
source), battery-charging current, and the presence of
an AC adapter. The MAX1908’s conditioning charge fea-
ture provides 300mA to safely charge deeply discharged
lithium-ion (Li+) battery packs.
The MAX1908 includes a conditioning charge feature
while the MAX8724 does not.
The MAX1908/MAX8724charge two to four series Li+
cells, providing more than 5A, and are available in a
space-saving 28-pin thin QFN package (5mm ×5mm).
An evaluation kit is available to speed designs.
ApplicationsNotebook and Subnotebook Computers
Personal Digital Assistants
Hand-Held Terminals
Features±0.5% Output Voltage Accuracy Using Internal
Reference (0°C to +85°C)±4% Accurate Input Current Limiting±5% Accurate Charge CurrentAnalog Inputs Control Charge Current and
Charge VoltageOutputs for Monitoring
Current Drawn from AC Adapter
Charging Current
AC Adapter PresenceUp to 17.6V Battery-Voltage Set PointMaximum 28V Input Voltage>95% EfficiencyShutdown Control InputCharges Any Battery Chemistry
Li+, NiCd, NiMH, Lead Acid, etc.
MAX1908/MAX8724
Low-Cost Multichemistry Battery Chargers
Pin Configuration
Ordering Information
Minimum Operating Circuit
MAX1908/MAX8724
Low-Cost Multichemistry Battery Chargers
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VDCIN= VCSSP= VCSSN = 18V, VBATT= VCSIP= VCSIN= 12V, VREFIN= 3V, VVCTL= VICTL= 0.75 x VREFIN, CELLS = float, CLS =
REF, VBST- VLX= 4.5V, ACIN = GND = PGND = 0, CLDO= 1µF, LDO = DLOV, CREF= 1µF; CCI, CCS, and CCV are compensated
per Figure 1a; 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, ACOKto GND.......................-0.3V to +30V
BST to GND............................................................-0.3V to +36V
BST to LX..................................................................-0.3V to +6V
DHI to LX...................................................-0.3V to (VBST+ 0.3V)
LX to GND.................................................................-6V to +30V
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, ICHG,
IINP, ACIN, REF to GND...........................-0.3V to (VLDO+ 0.3V)
DLOV, VCTL, ICTL, REFIN, CELLS, CLS,
LDO, SHDNto GND.................................................-0.3V to +6V
DLOV to LDO.........................................................-0.3V to +0.3V
DLO to PGND.........................................-0.3V to (VDLOV+ 0.3V)
LDO Short-Circuit Current...................................................50mA
Continuous Power Dissipation (TA= +70°C)
28-Pin Thin QFN (5mm ×5mm)
(derate 20.8mW/°C above +70°C) .........................1666.7mW
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
MAX1908/MAX8724
Low-Cost Multichemistry Battery Chargers
ELECTRICAL CHARACTERISTICS (continued)(VDCIN= VCSSP= VCSSN = 18V, VBATT= VCSIP= VCSIN= 12V, VREFIN= 3V, VVCTL= VICTL= 0.75 x VREFIN, CELLS = float, CLS =
REF, VBST- VLX= 4.5V, ACIN = GND = PGND = 0, CLDO= 1µF, LDO = DLOV, CREF= 1µF; CCI, CCS, and CCV are compensated
per Figure 1a; TA
= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
MAX1908/MAX8724
Low-Cost Multichemistry Battery Chargers
ELECTRICAL CHARACTERISTICS (continued)(VDCIN= VCSSP= VCSSN = 18V, VBATT= VCSIP= VCSIN= 12V, VREFIN= 3V, VVCTL= VICTL= 0.75 x VREFIN, CELLS = float, CLS =
REF, VBST- VLX= 4.5V, ACIN = GND = PGND = 0, CLDO= 1µF, LDO = DLOV, CREF= 1µF; CCI, CCS, and CCV are compensated
per Figure 1a; TA
= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
MAX1908/MAX8724
Low-Cost Multichemistry Battery Chargers
ELECTRICAL CHARACTERISTICS (continued)(VDCIN= VCSSP= VCSSN = 18V, VBATT= VCSIP= VCSIN= 12V, VREFIN= 3V, VVCTL= VICTL= 0.75 x VREFIN, CELLS = float, CLS =
REF, VBST- VLX= 4.5V, ACIN = GND = PGND = 0, CLDO= 1µF, LDO = DLOV, CREF= 1µF; CCI, CCS, and CCV are compensated
per Figure 1a; TA
= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
