BQ2057CSN BENCHMARQ, BQ2057CSN Datasheet - Page 9

• Manufacturer Part Number: BQ2057CSN
• Description: PROG BATTERY CHARGER, 2057, SOIC8
• Manufacturer: BENCHMARQ

Specifications of BQ2057CSN

• Battery Type: Li-Ion / Li-Polymer
• Input Voltage: 15V
• Battery Charge Voltage: 4.2V
• Charge Current Max: 2A
• Battery Ic Case Style: SOIC
• No. Of Pins: 8
• No. Of Series Cells: 1
• Operating Temperature: RoHS Compliant

SLUS025F − MAY 2001 − REVISED JULY 2002
APPLICATION INFORMATION
Preconditioning
Current Regulation
Voltage Regulation and Charge
Phase
Phase
Termination Phase
Regulation Voltage
Regulation Current
Minimum Charge
Voltage
Preconditioning
and Taper Detect
Figure 3. Typical Charge Profile
qualification and precharge
When power is applied, the bq2057 starts a charge-cycle if a battery is already present or when a battery is
inserted. Charge qualification is based on battery temperature and voltage. The bq2057 suspends charge if the
battery temperature is outside the V
to V
range and suspends charge until the battery temperature is
(TS1)
(TS2)
within the allowed range. The bq2057 also checks the battery voltage. If the battery voltage is below the
precharge threshold V
, the bq2057 uses precharge to condition the battery. The conditioning charge rate
(min)
I
is set at approximately 10% of the regulation current. The conditioning current also minimizes heat
(PRECHG)
dissipation in the external pass-element during the initial stage of charge. See Figure 3 for a typical
charge-profile.
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