BQ2057CSN BENCHMARQ, BQ2057CSN Datasheet - Page 9
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BQ2057CSN
Manufacturer Part Number
BQ2057CSN
Description
PROG BATTERY CHARGER, 2057, SOIC8
Manufacturer
BENCHMARQ
Datasheet
1.BQ2057CSN.pdf
(31 pages)
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
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
BQ2057CSN
Manufacturer:
TIBB
Quantity:
529
Part Number:
BQ2057CSN
Manufacturer:
TI/德州仪器
Quantity:
20 000
Part Number:
BQ2057CSNTR
Manufacturer:
TI/德州仪器
Quantity:
20 000
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.
9
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