参数资料
型号: LTC4071IMS8E#PBF
厂商: Linear Technology
文件页数: 13/18页
文件大小: 0K
描述: IC LI-ION/POLY BATT CHRGR 8-MSOP
标准包装: 50
功能: 充电管理
电池化学: 锂离子(Li-Ion)、锂聚合物(Li-Pol)
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 8-TSSOP,8-MSOP(0.118",3.00mm 宽)裸露焊盘
供应商设备封装: 8-MSOP-EP
包装: 管件
LTC4071
APPLICATIONS INFORMATION
the four input 249k resistors are sized for acceptable UL
leakage in the event that one of the resistors short. Here,
the LTC4071 will fully charge the battery from the AC line
while meeting the UL specification with 104μA of available
charge current.
A simple photovoltaic (PV) application for the LTC4071
is illustrated in Figure 6. At low V CC voltage, PV current
flows to both the system at V CC as well as the battery.
DS16003
SYSTEM LOAD
When V CC reaches the programmed float voltage (4.1V
with ADJ floating) then the LTC4071 shunts excess current
not used by the load, limiting V CC to 4.1V and effectively
reducing the battery charge current to zero. If the PV cells
stop supplying current, the battery supports the load at
V CC through the LTC4071. Add a diode in series with the
PV cells to prevent reverse leakage of the PV cells from
draining the battery. If the battery discharges to the point
where V CC falls below V LBD (3.2V with LBSEL tied to
GND) the LTC4071 disconnects the load from the battery
to protect the battery from over discharge.
GND
+
+
+
+
**
**
**
**
FLOAT
1μF
ADJ V CC BAT
NTCBIAS
LTC4071
NTC
LBSEL
10k
T*
+
Li-Ion
Typically, solar cells are inherently limited in current, but
this circuit may require a resistor, R IN , in series with the
LTC4071 for high current solar cells. Select R IN such that
the LTC4071 never needs to shunt more than 50mA.
The simple schematic in Figure 7 illustrates a complete
piezoelectric energy harvesting application using the
LTC4071 to charge and protect Li-Ion cells along with the
LTC3588-1 to rectify and regulate energy generated from
a piezoelectric generator to a fixed 3.3V load.
4071 F06
* NTHS0402N02N1002F
** JAMECO 171061
Figure 6. Simple Photovoltaic Charger
MMSD4148T1
15k
V CC
LTC4071
BAT
+ Li-Ion
BATTERY
22μF
1μF
GND
1μF
LBSEL
V CC BAT
LTC4071
LBSEL
GND
+ Li-Ion
PFCB-W14
BATTERY V IN2
PZ1
PZ2
D1
D0
V IN CAP
LTC3588-1 SW
V OUT
V IN2
GND
10μH
4.7μF
3.3V
SYSTEM
LOAD
100μF
4071 F07
Figure 7. Piezoelectric Energy Harvester with Battery Backup
4071fc
13
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