BQ2057CSN BENCHMARQ, BQ2057CSN Datasheet - Page 11
![no-image](/images/no-image-200.jpg)
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
voltage regulation phase
DC+
DC−
The voltage regulation feedback is through the BAT pin. This input is tied directly to the positive side of the
battery pack. The bq2057 monitors the battery-pack voltage between the BAT and VSS pins. The bq2057 is
offered in four fixed-voltage versions: 4.1 V, 4.2 V, 8.2 V and 8.4 V.
Other regulation voltages can be achieved by adding a voltage divider between the positive and negative
terminals of the battery pack and using bq2057T or bq2057W. The voltage divider presents scaled battery-pack
voltage to BAT input. (See Figure 7 and Figure 8.) The resistor values RB1 and RB2 for the voltage divider are
calculated by the following equation:
Where:
Figure 5. High-Side Current Sensing
N = Number of cells in series
V
R SNS
(CELL)
R
R
B1
B2
= Desired regulation voltage per cell
+
SNS
BAT
VCC
TS
N
bq2057
V
COMP
V
STAT
O(REG)
VSS
(CELL)
CC
APPLICATION INFORMATION
–1
BAT+
BAT−
www.ti.com
DC+
DC−
Figure 6. Low-Side Current Sensing
SNS
BAT
VCC
TS
SLUS025F − MAY 2001 − REVISED JULY 2002
bq2057
R SNS
COMP
STAT
VSS
CC
BAT+
BAT−
(2)
11