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BQ2057DGK Datasheet(PDF) 10 Page - Texas Instruments

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Part # BQ2057DGK
Description  ADVANCED LINEAR CHARGE MANAGEMENT IC FOR SINGLE-AND TWO-CELL LITHIUM-ION AND LITHIUM-POLYMER
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

BQ2057DGK Datasheet(HTML) 10 Page - Texas Instruments

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bq2057, bq2057C
bq2057T, bq2057W
SLUS025F − MAY 2001 − REVISED JULY 2002
10
www.ti.com
APPLICATION INFORMATION
CC
SNS
VCC
VSS
COMP
BAT
TS
STAT
bq2057
D1
U2
R3
1 k
RT2
RT1
TEMP
PACK−
PACK+
C2
0.1
µF
NTC
Battery
Pack
DC+
RSNS
0.2
CMD67−
22SRUC
R5
1 k
R2
1 k
R4
511
C1
0.1
µF
Q1
SI6475DQ
GND
U1
Figure 4. 0.5-A Charger Using P-Channel MOSFET
current regulation phase
The bq2057 regulates current while the battery-pack voltage is less than the regulation voltage, VO(REG). The
bq2057 monitors charge current at the SNS input by the voltage drop across a sense-resistor, RSNS, in series
with the battery pack. In high-side current sensing configuration (Figure 5), RSNS is between the VCC and SNS
pins, and in low-side sensing (Figure 6) the RSNS is between VSS (battery negative) and SNS (charger ground)
pins. Charge-current feedback, applied through pin SNS, maintains a voltage of V(SNS) across the current sense
resistor. The following formula calculates the value of the sense resistor:
R
SNS +
V
(SNS)
I
O(REG)
Where IO(REG) is the desired charging current.
(1)


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