参数资料
型号: BQ2057TTSG4
厂商: Texas Instruments
文件页数: 10/31页
文件大小: 0K
描述: IC LI-ION LDO CHRG MGMT 8-TSSOP
标准包装: 150
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-TSSOP(0.173",4.40mm 宽)
供应商设备封装: 8-TSSOP
包装: 管件
配用: 296-9502-ND - EVAL MOD FOR BQ257T
bq2057, bq2057C
bq2057T, bq2057W
SLUS025F ? MAY 2001 ? REVISED JULY 2002
APPLICATION INFORMATION
Q1
DC+
D1
RSNS
0.2 ?
SI6475DQ
PACK+
Battery
Pack
C2
R2
1 k ?
U1
0.1 μ F
PACK?
NTC
CC
SNS
bq2057
COMP
BAT
RT1
TEMP
VCC
VSS
R4
511 ?
TS
STAT
RT2
C1
0.1 μ F
R5
U2
1 k ?
R3
1 k ?
CMD67?
22SRUC
GND
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, V O(REG) . The
bq2057 monitors charge current at the SNS input by the voltage drop across a sense-resistor, R SNS , in series
with the battery pack. In high-side current sensing configuration (Figure 5), R SNS is between the VCC and SNS
pins, and in low-side sensing (Figure 6) the R SNS 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:
(SNS)
O(REG)
R
SNS
+
V
I
(1)
Where I O(REG) is the desired charging current.
10
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相关代理商/技术参数
参数描述
BQ2057TTSTR 功能描述:电池管理 Li-Ion LDO Linear Charge Management IC RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel
BQ2057TTSTRG4 功能描述:电池管理 Li-Ion LDO Linear Charge Management IC RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel
BQ2057W 制造商:TI 制造商全称:Texas Instruments 功能描述:ADVANCED LINEAR CHARGE MANAGEMENT IC FOR SINGLE AND TWO CELL LITHIUM-POLYMER
BQ2057WPN 制造商:未知厂家 制造商全称:未知厂家 功能描述:Industrial Control IC
BQ2057WSN 功能描述:电池管理 Li-Ion LDO Linear Charge Management IC RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel