Управление питанием от батарей BQ2057SN

Зарядное устройство для 1-элементной литий-ионной , Li-Pol батареи, 15В вход, 4.2В/2А зарядка, SOIC-8

The BQ2057SN is an advance linear charge management Integrated Circuit for single and two cell lithium ion and lithium polymer. This IC combines high-accuracy current and voltage regulation, battery conditioning, temperature monitoring, charge termination, charge-status indication and AutoComp charge-rate. The BQ2057 continuously measures battery temperature using an external thermistor. For safety, the IC inhibits charge until the battery temperature is within user-defined thresholds. The IC then charges the battery in three phases conditioning, constant current and constant voltage. If the battery voltage is below the low-voltage threshold V(min), the IC pre-charges using a low current to condition the battery. The conditioning charge rate is approximately 10% of the regulation current. The conditioning current also minimizes heat dissipation in the external pass-element during the initial stage of the charge. After conditioning, the IC applies a constant current to the battery.

• Requires small number of external components
• Better than ±1% voltage regulation accuracy with pre-set 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
• Integrated cell conditioning for reviving deeply discharged cells
• 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
• Green product and no Sb/Br

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Управление Питанием