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MAX1909ETI ,Multichemistry Battery Charger with Automatic System Power SelectorApplicationsP3TO0.01ΩEXTERNAL LOADNotebook and Subnotebook Computers AC ADAPTER: INPUTSRCHand-Held ..
MAX1909ETI+ ,Multichemistry Battery Chargers with Automatic System Power SelectorFeatures• Precise Measurement Improves Safety andThe MAX1909/MAX8725 highly integrated control ICsP ..
MAX1909ETI+T ,Multichemistry Battery Chargers with Automatic System Power SelectorGeneral Description Benefits and
MAX190ACWG ,Low-Power / 12-Bit Sampling ADCs with Internal Reference and Power-DownApplications Battery-Powered Data Logging PC Pen Digitizers High-Accuracy Process Control Ele ..
MAX190AENG ,Low-Power / 12-Bit Sampling ADCs with Internal Reference and Power-Down19-4506, Hev2; 4/93 MAX191 RECOMMENDED FOR NEW DESIGNS lVI/lXI/I/I Low-Power, 12-Bit Sampl ..
MAX190AEWG ,Low-Power / 12-Bit Sampling ADCs with Internal Reference and Power-Down19-4506, Hev2; 4/93 MAX191 RECOMMENDED FOR NEW DESIGNS lVI/lXI/I/I Low-Power, 12-Bit Sampl ..
MAX487CPA ,Low-Power / Slew-Rate-Limited RS-485/RS-422 TransceiversMAX481/MAX483/MAX485/MAX487–MAX491/MAX148719-0122; Rev 5; 2/96Low-Power, Slew-Rate-LimitedRS-485/RS ..
MAX487CPA+ ,Low-Power, Slew-Rate-Limited RS-485/RS-422 TransceiversELECTRICAL CHARACTERISTICS(V = 5V ±5%, T = T to T , unless otherwise noted.) (Notes 1, 2)CC A MIN M ..
MAX487CSA ,Low-Power / Slew-Rate-Limited RS-485/RS-422 TransceiversApplications ______________Ordering InformationLow-Power RS-485 TransceiversPART TEMP. RANGE PIN-PA ..
MAX487CSA ,Low-Power / Slew-Rate-Limited RS-485/RS-422 TransceiversGeneral Description ________
MAX487CSA ,Low-Power / Slew-Rate-Limited RS-485/RS-422 TransceiversGeneral Description ________
MAX487CSA/T ,Low-Power, Slew-Rate-Limited RS-485/RS-422 TransceiversApplicationsMAX491, and MAX1487 are not limited, allowing them toMAX3460–MAX3464: +5V, Fail-Safe, 2 ..

MAX1909ETI
Multichemistry Battery Charger with Automatic System Power Selector
General Description
The MAX1909 highly integrated control IC simplifies
construction of accurate and efficient multichemistry
battery chargers. The MAX1909 uses analog inputs to
control charge current and voltage, and can be pro-
grammed by a host microcontroller (µC) or hardwired.
High efficiency is achieved through use of buck topolo-
gy with synchronous rectification.
The maximum current drawn from the AC adapter is
programmable to avoid overloading the AC adapter
when supplying the load and the battery charger simul-
taneously. The MAX1909 provides a digital output that
indicates the presence of an AC adapter, and an ana-
log output that monitors the current drawn from the AC
adapter. Based on the presence or absence of the AC
adapter, the MAX1909 automatically selects the appro-
priate source for supplying power to the system by con-
trolling two external P-channel MOSFETs. Under system
control, the MAX1909 allows 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 is available in a space-saving 28-pin,
5mm ✕5mm thin QFN package and operates over the
extended -40°C to +85°C temperature range.
Applications
Notebook 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 and
Charge VoltageMonitor Outputs for
Current Drawn from AC Input Source
AC Adapter PresentUp to 17.65V (max) Battery VoltageMaximum 28V Input VoltageGreater than 95% EfficiencyConditioning Charge Safely Charges
Overdischarged Li+ PacksCharges Any Battery Chemistry: Li+, NiCd, NiMH,
Lead Acid, etc.
MAX1909
Multichemistry Battery Charger with Automatic
System Power Selector
Ordering Information
19-2805; Rev 0; 4/03
Pin Configuration
Minimum Operating Circuit
Functional Diagrams appear at end of data sheet.
MAX1909
Multichemistry Battery Charger 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 QFN (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
Multichemistry Battery Charger 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
Multichemistry Battery Charger 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
Multichemistry Battery Charger 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
Multichemistry Battery Charger with Automatic
System Power Selector
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.)
MAX1909
Multichemistry Battery Charger 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
Multichemistry Battery Charger 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
Multichemistry Battery Charger 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.)
Note 1:Guaranteed by design. Not production tested.
Typical Operating Characteristics
(Circuit of Figure 2, VDCIN= 20V, charge current = 3A, 4 Li+ series cells, TA= +25°C, unless otherwise noted.)
MAX1909
Multichemistry Battery Charger with Automatic
System Power Selector
LDO LOAD REGULATION
MAX1909 toc04
LDO CURRENT (mA)
LDO OUTPUT ERROR (%)87654321
LINE TRANSIENT RESPONSE
MAX1909 toc03
500µs/div
1.8V
VBATT AC-COUPLED
200mV/div
INDUCTOR CURRENT
200mA/div
1.6V
20V
30V
VDCIN
VCCV
Typical Operating Characteristics (continued)
(Circuit of Figure 2, VDCIN= 20V, charge current = 3A, 4 Li+ series cells, TA= +25°C, unless otherwise noted.)
MAX1909
Multichemistry Battery Charger 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.)
MAX1909
Multichemistry Battery Charger with Automatic
System Power Selector
Pin Description
MAX1909
Multichemistry Battery Charger with Automatic
System Power Selector
Figure 1. Typical Operating Circuit Demonstrating Hardwired Control
MAX1909
Multichemistry Battery Charger with Automatic
System Power Selector
Figure 2. Smart-Battery Charger Circuit Demonstrating Operation with a Host Microcontroller
MAX1909
Multichemistry Battery Charger with Automatic
System Power Selector
Figure 3. Functional Diagram

Partno	Mfg	Dc	Qty	Available	Descript
MAX1909ETI	MAXIM	N/a	2160	avai	Multichemistry Battery Charger with Automatic System Power Selector