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Status

Active: In Production.

Data Sheet

FULL DATA SHEET (PDF, 368kB) Download   E-Mail

Description

The MAX1645B is a high-efficiency battery charger capable of charging batteries of any chemistry type. It uses the Intel System Management Bus (SMBus™) to control voltage and current-charge outputs. When charging lithium-ion (Li+) batteries, the MAX1645B automatically transitions from regulating current to regulating voltage. The MAX1645B can also limit line input current so as not to exceed a predetermined current drawn from the DC source. A 175s charge safety timer prevents "runaway charging" should the MAX1645B stop receiving charging voltage/current commands. The MAX1645B employs a next-generation synchronous buck control circuitry that lowers the minimum input-to-output voltage drop by allowing the duty cycle to exceed 99%. The MAX1645B can easily charge one to four series Li+ cells.

Key Features		Applications/Uses
Input Current Limiting 175s Charge Safety Timeout 128mA Wake-Up Charge Charges Any Chemistry Battery: Li+, NiCd, NiMH, Lead Acid, etc. Intel SMBus 2-Wire Serial Interface Compliant with Level 2 Smart Battery Charger Spec Rev 1.0 +8V to +28V Input Voltage Range Up to 18.4V Battery Voltage 11-Bit Battery Voltage Setting ±0.8% Output Voltage Accuracy with Internal Reference 3A (max) Battery Charge Current 6-Bit Charge-Current Setting 99.99% (max) Duty Cycle for Low-Dropout Operation Load/Source Switchover Drivers >97% Efficiency		Notebook Computers Personal Digital Assistants Point-of-Sale Terminals

Diagram

Typical Operating Circuit

Reliability Reports

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Software/Models

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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: 1-4 of 4

MAX1645B	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX1645BEEI			Active	QSOP;28 pin;61.9 mm² Outline Drawing: 21-0055 (PDF) Land Pattern: 90-0173 (PDF) Use pkgcode/variation: E28-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1645BEEI-T			Active	QSOP;28 pin;61.9 mm² Outline Drawing: 21-0055 (PDF) Land Pattern: 90-0173 (PDF) Use pkgcode/variation: E28-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1645BEEI+			Active	QSOP;28 pin;61.9 mm² Outline Drawing: 21-0055 (PDF) Land Pattern: 90-0173 (PDF) Use pkgcode/variation: E28+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1645BEEI+T			Active	QSOP;28 pin;61.9 mm² Outline Drawing: 21-0055 (PDF) Land Pattern: 90-0173 (PDF) Use pkgcode/variation: E28+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis

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