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MAX745C/D Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX745C/D Datasheet(HTML) 1 Page - Maxim Integrated Products |
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1 / 9 page  General Description The MAX745 provides all functions necessary for charging lithium-ion (Li+) battery packs. It provides a regulated charging current of up to 4A without getting hot, and a regulated voltage with only ±0.75% total error at the battery terminals. It uses low-cost, 1% resistors to set the output voltage, and a low-cost N-channel MOSFET as the power switch. The MAX745 regulates the voltage set point and charging current using two loops that work together to transition smoothly between voltage and current regulation. The per-cell battery voltage regulation limit is set between 4V and 4.4V using standard 1% resistors, and then the number of cells is set from 1 to 4 by pin-strapping. Total output voltage error is less than ±0.75%. For a similar device with an SMBus™ microcontroller interface and the ability to charge NiCd and NiMH cells, refer to the MAX1647 and MAX1648. For a low-cost Li+ charger using a linear-regulator control scheme, refer to the MAX846A. Applications ● Li+ Battery Packs ● Desktop Cradle Chargers ● Cellular Phones ● Notebook Computers ● Hand-Held Instruments Features ● Charges 1 to 4 Li+ Battery Cells ● ±0.75% Voltage-Regulation Accuracy Using 1% Resistors ● Provides up to 4A without Excessive Heating ● 90% Efficient ● Uses Low-Cost Set Resistors and N-Channel Switch ● Up to 24V Input ● Up to 18V Maximum Battery Voltage ● 300kHz Pulse-Width Modulated (PWM) Operation • Low-Noise, Small Components ● Stand-Alone Operation—No Microcontroller Needed SMBus is a trademark of Intel Corp. 19-1182; Rev 4; 6/19 Pin Configuration appears at end of data sheet. *Dice are tested at TA = +25°C. PART TEMP RANGE PIN-PACKAGE MAX745C/D 0°C to +70°C Dice* MAX745EAP -40°C to +85°C 20 SSOP MAX745 Switch-Mode Lithium-Ion Battery-Charger Ordering Information (UP TO 24V) REF DCIN VIN BST VL DHI DLO LX CS BATT CELL COUNT SELECT SET PER CELL VOLTAGE WITH 1% RESISTORS ON OFF VADJ STATUS SETI CELL0 CELL1 CCI PGND GND IBAT CCV N N ICHARGE RSENSE VOUT 1–4 Li+ CELLS (UP TO 18V) MAX745 THM/SHDN Typical Operating Circuit EVALUATION KIT AVAILABLE Click here for production status of specific part numbers. |
Similar Part No. - MAX745C/D |
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Similar Description - MAX745C/D |
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