参数资料
型号: BQ2057CSNTRG4
厂商: Texas Instruments
文件页数: 11/31页
文件大小: 0K
描述: IC LI-ION LDO CHRG MGMT 8-SOIC
标准包装: 2,500
功能: 充电管理
电池化学: 锂离子(Li-Ion)、锂聚合物(Li-Pol)
电源电压: 4.5 V ~ 15 V
工作温度: -20°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 8-SOIC(0.154",3.90mm 宽)
供应商设备封装: 8-SOIC
包装: 带卷 (TR)
配用: 296-9501-ND - EVAL MOD FOR BQ2057C
bq2057, bq2057C
bq2057T, bq2057W
SLUS025F ? MAY 2001 ? REVISED JULY 2002
APPLICATION INFORMATION
DC+
DC+
RSNS
BAT+
bq2057
BAT+
DC?
SNS
BAT
VCC
TS
bq2057
COMP
CC
VSS
STAT
BAT?
DC?
SNS
BAT
VCC
TS
COMP
CC
VSS
STAT
RSNS
BAT?
Figure 5. High-Side Current Sensing
Figure 6. Low-Side Current Sensing
voltage regulation phase
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:
(CELL)
O(REG)
R
R
B1 +
B2
N
V
V
–1
(2)
Where:
N = Number of cells in series
V (CELL) = Desired regulation voltage per cell
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