参数资料
型号: BQ2057TTSG4
厂商: Texas Instruments
文件页数: 12/31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
DC+
DC+
RSNS
bq2057
RB1
BAT+
SNS
bq2057
COMP
RB1
BAT+
SNS
COMP
BAT
CC
RB2
BAT
CC
RB2
VCC
VSS
BAT?
VCC
TS
VSS
STAT
BAT?
DC?
TS
STAT
RSNS
DC?
Figure 7. Optional Voltage Divider for
Nonstandard Regulation Voltage,
(High-Side Current Sensing)
Figure 8. Optional Voltage Divider for
Nonstandard Regulation Voltage,
(Low-Side Current Sensing)
charge termination and recharge
The bq2057 monitors the charging current during the voltage-regulation phase. The bq2057 declares a done
condition and terminates charge when the current tapers off to the charge termination threshold, I (TERM) . A new
charge cycle begins when the battery voltage falls below the V (RCH) threshold.
battery temperature monitoring
The bq2057 continuously monitors temperature by measuring the voltage between the TS and VSS pins. A
negative- or a positive-temperature coefficient thermistor (NTC, PTC) and an external voltage divider typically
develop this voltage. (See Figure 9.) The bq2057 compares this voltage against its internal V (TS1) and V (TS2)
thresholds to determine if charging is allowed. (See Figure 10.) The temperature sensing circuit is immune to
any fluctuation in V CC , since both the external voltage divider and the internal thresholds (V (TS1) and V (TS2) )
are referenced to VCC.
The resistor values of R (T1) and R (T2) are calculated by the following equations:
For NTC Thermistors
R
T1
+
5
3
R
R
TH
TC
R
* R
TC
TH
(3)
TH
TC
TH
R
T2
+
2
5
R
R
– 7
R
TC
R
(4)
12
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