MAX1909

PRODUCTION

Multichemistry Battery Chargers with Automatic System Power Selector

0.5% Accurate Multichemistry Battery Chargers for Single- and Dual-Battery Systems

Data Sheet (Rev. 3) Product Selection Table

Part Models: 2
1ku List Price: Starting From $3.96

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Part Details

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

Part Models: 2
1ku List Price: Starting From $3.96

Documentation

Data Sheet 1

MAX1909-MAX8725: Multichemistry Battery Chargers with Automatic System Power Selector Data Sheet (Rev.3) 06/05/2015

Reliability Data 1

MAX1909 Reliability Data 01/12/2023

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
MAX1909ETI+	28-LFCSP-5X5X0.75	Material Declaration Reliablity Data	Ultra Librarian SamacSys
MAX1909ETI+T	28-LFCSP-5X5X0.75	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Jun 20, 2016 - 1612 ASSEMBLY
		pcn_1612
MAX1909ETI+	PRODUCTION
MAX1909ETI+T	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Product 1
MAX1535		Highly Integrated Level 2 SMBus Battery Chargers
Switching Battery Chargers 3
MAX1908	PRODUCTION	Low-Cost Multichemistry Battery Chargers
MAX1772	PRODUCTION	Low-Cost, Multichemistry Battery-Charger Building Block
MAX1645B	PRODUCTION	Advanced Chemistry-Independent, Level 2 Battery Charger with Input Current Limiting

Evaluation Kits

Evaluation Kit for the MAX1909

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Features and Benefits

Input Current Limiting
±0.5% Output Voltage Accuracy Using Internal Reference
Automatic Selection of System Power Source
Analog Inputs Control Charge Current and Charge Voltage
Monitor Outputs for
- AC Adapter Current
- AC Adapter Presence
Up to 17.6V Battery Voltage
+8V to +25V Input Voltage
Up to 3A Battery Charge Current
Charges Li+, NiCd, and NiMH Battery Chemistries
Surface-Mount Construction
Fully Assembled and Tested

Product Details

The MAX1909 evaluation kit (EV kit) is an accurate and efficient multichemistry battery charger. The EV kit can charge three or four series Li+ cells with a current up to 3A. Charge current and input-source current are adjustable using on-board potentiometers. The output voltage is set to 4.2V x the number of series cells in the battery pack. The number of series cells is jumper-selectable. The output voltage is adjustable between 4V to 4.4V (x number of series cells) by installing two resistors. The EV kit provides outputs to monitor the AC adapter current and the presence of an AC adapter.

The MAX1909 automatically selects the power path for supplying power to the system by controlling two external P-channel MOSFETs. This decision is made based on the presence of an AC adapter.

Applications

Handheld Data Terminals
Notebook and Subnotebook Computers

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