BQ2057W Evaluation Module for Li-Ion, linear (8.4V), two cells Status: ACTIVE

Product Information

Description

The DV2057/C/T/W are complete development and evaluation environments for bq2057 series advanced Li-Ion linear charge management ICs. The DV2057 family supports both single- and dual-cell Li-Ion packs with coke or graphite anodes:

• DV2057 - regulation voltage = 4.1V
• DV2057C - regulation voltage = 4.2V
• DV2057T - regulation voltage = 8.2V
• DV2057W - regulation voltage = 8.4V

Full charge is preceded by charge qualification based on battery temperature and voltage. The DV2057W suspends charge if the battery temperature is outside the V_TS1 to V_TS2 thresholds and waits until the battery temperature is within the allowed voltage. If the battery voltage is below the low-voltage threshold, V_MIN, the DV2057W uses trickle charge to condition the battery. The conditioning charge rate, I_COND, is set at approximately 10% of the regulation current. The conditioning current also minimizes heat dissipation in the external pass element during the initial stage of charge.

Once the battery voltage reaches the internal threshold, V_MIN, full charge begins. The DV2057W completes the charge cycle in two phases. While the pack is below the regulation voltage, a constant-current phase replenishes approximately 70% of battery capacity. An accurate voltage-regulation phase completes the charge. The DV2057W terminates charge when the current tapers off to the V_TERM threshold.

These boards feature the proprietary AutoComp^TM technique to compensate safely for the internal impedance of the battery. The AutoComp^TM resistors, R_COMP1, and R_COMP2, must be set according to the characteristics of the battery.

Before using these development boards, please review the bq2057 datasheet.

Features

• bq2057 charge-control evaluation and development system for single- and dual-cell Li-Ion packs with coke or graphite anodes
• Optional temperature monitoring before and during charge
• Proprietary AutoComp^TM charge-rate compensation
• Integrated trickle-charge for conditioning deeply discharged batteries
• Regulated charge current and voltage
• Charge status output for LED or host-processor interface to indicate charge-in-progress, full-capacity, and fault conditions
• Automatic battery recharge feature
• Charge termination by minimum current
• Direct battery connection
• 500mA charge rate
• High-side current sensing