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Active: In Production.

Data Sheet

FULL DATA SHEET (PDF, 480kB) Download   E-Mail

Description

The MAX1909/MAX8725 highly integrated control ICs simplify construction of accurate and efficient multichemistry battery chargers. The MAX1909/MAX8725 use 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/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 system 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 x 5mm thin QFN packages and operate over the extended -40°C to +85°C temperature range. The MAX1909/MAX8725 are now available in lead-free packages.

An evaluation kit is available:  MAX1909EVKIT   MAX8725EVKIT  

Key Features		Applications/Uses
±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 Presence Up to 17.65V (max) Battery Voltage Maximum 28V Input Voltage Greater than 95% Efficiency Charge Any Battery Chemistry: Li+, NiCd, NiMH, Lead Acid, etc.		Handheld Data Terminals Notebook and Subnotebook Computers

Diagram

Pin Configuration

Evaluation Kits

MAX1909EVKIT MAX8725EVKIT

Design Guides

Power Management for Battery-Powered Equipment (PDF)

Reliability Reports

Reliability Report: MAX8725.pdf Show FIT data for: MAX1909 MAX8725 Request Reliability Report for: MAX1909

Software/Models

none

Ordering Information

Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

Devices: 1-8 of 8

MAX1909	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX1909ETI			Active	TQFN;28 pin;26 mm² Outline Drawing: 21-0140 (PDF) Land Pattern: 90-0026 (PDF) Use pkgcode/variation: T2855-6*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1909ETI-T			Active	Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX1909ETI+			Active	TQFN;28 pin;26 mm² Outline Drawing: 21-0140 (PDF) Land Pattern: 90-0026 (PDF) Use pkgcode/variation: T2855+6*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1909ETI+T			Active	TQFN;28 pin;26 mm² Outline Drawing: 21-0140 (PDF) Land Pattern: 90-0026 (PDF) Use pkgcode/variation: T2855+6*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX8725	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX8725ETI			Active	TQFN;28 pin;26 mm² Outline Drawing: 21-0140 (PDF) Land Pattern: 90-0026 (PDF) Use pkgcode/variation: T2855-6*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX8725ETI-T			Active	Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX8725ETI+			Active	TQFN;28 pin;26 mm² Outline Drawing: 21-0140 (PDF) Land Pattern: 90-0026 (PDF) Use pkgcode/variation: T2855+6*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX8725ETI+T			Active	TQFN;28 pin;26 mm² Outline Drawing: 21-0140 (PDF) Land Pattern: 90-0026 (PDF) Use pkgcode/variation: T2855+6*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis

More Information

New Product Press Release 2003-04-24

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