电源ic bq2057wsn 8.4v充电ic

bq2057wsntr 

锂离子低压降线性 (8.4v) 充电管理 ic，用于具有 autocomptm 的两节应用领域

产品信息

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 vcc is removed

evms available for quick evaluation

packaging: 8-pin soic, 8-pin tssop, 8-pin msop

autocomp is a trademark of texas instruments.

说明

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.