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Part Number: MAX1909
Description: The MAX1909 highly integrated control IC simplifies construction of accurate and efficient multichemis...
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MAX1909
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DataSheet
General Description
MAX1909 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 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 programmable to avoid overloading the AC adapter when supplying the load and the battery charger simultaneously. The MAX1909 provides 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 automatically selects the appropriate source for supplying power to the system by controlling 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.
MAX1909 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 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
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 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 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 Present
Up to 17.65V (max) Battery Voltage
Maximum 28V Input Voltage
Greater than 95% Efficiency
Conditioning Charge Safely Charges Overdischarged Li+ Packs
Charges Any Battery Chemistry: Li+, NiCd, NiMH, Lead Acid, etc.
±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 Present
Up to 17.65V (max) Battery Voltage
Maximum 28V Input Voltage
Greater than 95% Efficiency
Conditioning Charge Safely Charges Overdischarged Li+ Packs
Charges Any Battery Chemistry: Li+, NiCd, NiMH, Lead Acid, etc.
MAX1909 Typical Application
Notebook and Subnotebook Computers
Hand-Held Data Terminals
Hand-Held Data Terminals
MAX1909 Connection Diagram
MAX1909
PDF/DataSheet Download
- Datasheet: MAX1909
- File Size: 455119 KB
- Manufacturer: MAXIM [Maxim Integrated Products]
- Click here to Download
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