bq2057wsn

ti 充電管理ic    4.2v

全新原裝，，歡迎選購 

產品信息

特性

• ideal for single (4.1 v or 4.2 v) and dual-cell (8.2 v or 8.4 v) li-ion or li-pol packs
• requires small number of external components
• 0.3 v dropout voltage for minimizing heat dissipation
• better than ±1% voltage regulation accuracy with preset voltages
• autocomp™ dynamic compensation of battery pack’s internal impedance to reduce charge time
• optional cell-temperature monitoring before and during charge
• integrated voltage and current regulation with programmable charge-current and high-or low-side current sensing
• integrated cell conditioning for reviving deeply discharged cells and minimizing heat dissipation during initial stage of charge
• charge status output for single or dual led or host processor interface
• automatic battery-recharge feature
• charge termination by minimum current
• automatic low-power sleep mode when v_ccis removed
• evms available for quick evaluation
• packaging: 8-pin soic, 8-pin tssop, 8-pin msop

autocomp is a trademark of texas instruments.

說明

the benchmarq bq2057 series advanced lithium-ion (li-ion) and lithium-polymer (li-pol) linear charge-management ics are designed for cost-sensitive and compact portable electronics. they combine high-accuracy current and voltage regulation, battery conditioning, temperature monitoring, charge termination, charge-status indication, and autocomp charge-rate compensation in a single 8-pin ic. msop, tssop, and soic package options are offered to fit a wide range of end applications.

the bq2057 continuously measures battery temperature using an external thermistor. for safety, the bq2057 inhibits charge until the battery temperature is within user-defined thresholds. the bq2057 then charges the battery in three phases: conditioning, constant current, and constant voltage.