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MAX1870AETJ Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX1870AETJ Datasheet(HTML) 1 Page - Maxim Integrated Products |
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1 / 32 page  General Description The MAX1870A step-up/step-down multichemistry bat- tery charger charges with battery voltages above and below the adapter voltage. This highly integrated charger requires a minimum number of external compo- nents. The MAX1870A uses a proprietary step-up/step- down control scheme that provides efficient charging. Analog inputs control charge current and voltage, and can be programmed by the host or hardwired. The MAX1870A accurately charges two to four lithium- ion (Li+) series cells at greater than 4A. A programma- ble input current limit is included, which avoids overloading the AC adapter when supplying the load and the battery charger simultaneously. This reduces the maximum adapter current, which reduces cost. The MAX1870A provides analog outputs to monitor the cur- rent drawn from the AC adapter and charge current. A digital output indicates the presence of an AC adapter. When the adapter is removed, the MAX1870A con- sumes less than 1µA from the battery. The MAX1870A is available in a 32-pin thin QFN (5mm x 5mm) package and is specified over the -40 °C to +85 °C extended temperature range. The MAX1870A evaluation kit (MAX1870AEVKIT) is available to help reduce design time. Applications Notebook and Subnotebook Computers Handheld Terminals Features ♦ Step-Up/Step-Down Control Scheme ♦ ±0.5% Charge-Voltage Accuracy ♦ ±9% Charge-Current Accuracy ♦ ±8% Input Current-Limit Accuracy ♦ Programmable Maximum Battery Charge Current ♦ Analog Inputs Control Charge Current, Charge Voltage, and Input Current Limit ♦ Analog Output Indicates Adapter Current ♦ Input Voltage from 8V to 28V ♦ Battery Voltage from 0 to 17.6V ♦ Charges Li+ or NiCd/NiMH Batteries ♦ Tiny 32-Pin Thin QFN (5mm x 5mm) Package Step-Up/Step-Down Li+ Battery Charger ________________________________________________________________ Maxim Integrated Products 1 Ordering Information MAX1870A REFIN DCIN CSSP CSSN DHI DBST CSIP CSIN BATT SHDN ASNS VCTL IINP PGND SYSTEM LOAD N P GND ICTL CLS CELLS FROM WALL ADAPTER CSSS VHN VHP BLKP REF LDO DLOV Typical Operating Circuit 19-3243; Rev 1; 9/05 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. EVALUATION KIT AVAILABLE Pin Configuration appears at end of data sheet. PART TEMP RANGE PIN-PACKAGE MAX1870AETJ -40°C to +85°C 32 Thin QFN MAX1870AETJ+ -40°C to +85°C 32 Thin QFN +Denotes lead-free package. |
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