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MAX8731AETI Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX8731AETI Datasheet(HTML) 1 Page - Maxim Integrated Products |
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1 / 32 page  General Description The MAX8731A is an SMBus™ programmable multi- chemistry battery charger. The MAX8731A uses a mini- mal command set to easily program the charge voltage, charge current, and adapter current limit. The MAX8731A charges one to four Li+ series cells and delivers up to 8A charge current. The MAX8731A drives n-channel MOSFETs for improved efficiency and reduced cost. Low-offset current-sense amplifiers pro- vide high accuracy with 10m Ω sense resistors. The MAX8731A current-sense amplifiers provide high accuracy (3% at 3.5A) and also provide fast cycle-by- cycle current-mode control to protect against battery short circuit and system load transients. The charger employs dual remote sense, which reduces charge time by measuring the feedback voltage directly at the battery, improving accuracy of initial transition into constant-voltage mode. The MAX8731A provides 0.5% battery voltage accuracy directly at the battery terminal. The MAX8731A provides a digital output that indicates the presence of the AC adapter, as well as an analog out- put that indicates the adapter current within 4% accuracy. The MAX8731A is available in a small 5mm x 5mm, 28-pin, thin (0.8mm) QFN package. An evaluation kit is available to reduce design time. The MAX8731A is avail- able in a lead-free package. Applications Notebook Computers Tablet PCs Medical Devices Portable Equipment with Rechargeable Batteries Features ♦ 0.5% Battery Voltage Accuracy ♦ 3% Input Current-Limit Accuracy ♦ 3% Charge-Current Accuracy ♦ SMBus 2-Wire Serial Interface ♦ Cycle-by-Cycle Current Limit Battery Short-Circuit Protection Fast Response for Pulse Charging Fast System-Load-Transient Response ♦ Dual-Remote-Sense Inputs ♦ Monitor Outputs for Adapter Current (4% Accuracy) AC Adapter Detection ♦ 11-Bit Battery Voltage Setting ♦ 6-Bit Charge-Current/Input-Current Setting ♦ 8A (max) Battery Charger Current ♦ 11A (max) Input Current ♦ +8V to +26V Input Voltage Range ♦ Charges Li+, NiMH, and NiCd Battery Chemistries SMBus Level 2 Battery Charger with Remote Sense ________________________________________________________________ Maxim Integrated Products 1 Ordering Information Typical Operating Circuit 19-0756; Rev 0; 1/07 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. SMBus is a trademark of Intel Corp. +Indicates a lead-free package. EVALUATION KIT AVAILABLE PART TEMP RANGE PIN- PACKAGE PKG CODE MAX8731AETI+ -40 °C to +85°C 28 Thin QFN (5mm x 5mm) T2855-6 EXTERNAL LOAD DCIN GND REF ACIN BATSEL BATTERY A BATTERY B SCL SDA VDD GND ACOK VCC LDO FBSB FBSA BST PGND CSIN CSIP DLO LX DHI OPTIONAL IINP CCV DAC CCS CSSP CSSN SELECTOR BATSEL CCI HOST SCL SDA VDD N N MAX8731A MAX8731A THIN QFN 5mm x 5mm TOP VIEW 26 27 25 24 10 9 11 12 12 BST 45 6 7 20 21 19 17 16 15 VCC CSSN GND VDD SCL SDA 3 18 28 8 CSSP IINP *EXPOSED PADDLE DHI 23 13 ACOK LX 22 14 BATSEL DCIN Pin Configuration |
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