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参数资料
| 型号： | LTC4070IDDB#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | IC BATT CHRGR LIION/POLY 8DFN |
| 产品培训模块： | LTC4070 - Li-Ion/Polymer Shunt Battery Charger System |
| 标准包装： | 500 |
| 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-WFDFN 裸露焊盘 |
| 供应商设备封装： | 8-DFN（3x2） |
| 包装： | 带卷 (TR) |
LTC4070
TYPICAL APPLICATIONS
MB4S
R4
R2
ADJ
+ Li-Ion
OR 2N3904
DANGER! HIGH VOLTAGE!
R3 R1
249k 249k
AC 110
249k 249k
– +
V CC
NTC
LTC4070
FLOAT
IF NOT NTCBIAS
NEEDED
GND BATTERY
4070 F05
DANGEROUS AND LETHAL POTENTIALS ARE PRESENT IN AC
LINE-CONNECTED CIRCUITS! BEFORE PROCEEDING ANY FURTHER,
THE READER IS WARNED THAT CAUTION MUST BE USED IN THE
CONSTRUCTION, TESTING AND USE OF AC LINE-CONNECTED
CIRCUITS. EXTREME CAUTION MUST BE USED IN WORKING WITH
AND MAKING CONNECTIONS TO THESE CIRCUITS. ALL TESTING
PERFORMED ON AN AC LINE-CONNECTED CIRCUIT MUST BE DONE
WITH AN ISOLATION TRANSFORMER CONNECTED BETWEEN THE
AC LINE AND THE CIRCUIT. USERS AND CONSTRUCTORS OF AC
LINE-CONNECTED CIRCUITS MUST OBSERVE THIS PRECAUTION
WHEN CONNECTING TEST EQUIPMENT TO THE CIRCUIT TO AVOID
ELECTRIC SHOCK.
Figure 5. 4.2V AC Line Charging, UL Leakage Okay
The LTC4070 can be used to charge a battery to a 4.2V
float voltage from an AC line with a bridge rectifier as
shown in the simple schematic in Figure 5. In this example,
the four input 249k resistors are sized for acceptable UL
leakage in the event that one of the resistors short. Here,
the LTC4070 will fully charge the battery from the AC line
while meeting the UL specification with only 104μA of
available charge current.
V BE and V BC diodes of Q1. While the battery is charging,
the majority of PV current flows to the battery. When V CC
reaches the programmed float voltage, in this case 4.1V
with ADJ floating, then the LTC4070 shunts base-collector
junction current from Q1, effectively reducing the battery
charging current to zero and saturating Q1. In the event
that the thermistor temperature rises and the float voltage
drops, the LTC4070 shunts more current, and Q1 is forced
to operate in reverse active mode until the battery voltage
falls. Once equilibrium is achieved, the difference between
V BAT and V CC should be less than a few mV, depending on
the magnitude of the shunt current.
Add a series input resistor, R IN , to limit the current from
high current solar cells. Solar cells are limited in current
normally, so for small cells no resistor is needed. With
high current PV cells, select R IN taking into account the
PV cell’s open-circuit voltage and short-circuit current,
the temperature coefficient of the V BC and V BE diodes and
the maximum collector current and operating junction
temperature of Q1. Using an isolating transistor reduces
discharge current to a few nanoamps, and may be extended
to other applications as well.
The PV application schematic in Figure 6 also illustrates
using the LTC4070 with a 10k, 5% curve 2 type NTC
thermistor, NTHS0402N02N1002F. Here R NOM is 10k,
and the rising temperature trip points are 40°C, 50°C,
60°C and 70°C.
V CC V BAT
Q1
MP5650
+ ADJ FLOAT
GND +
R NTC : NTHS0402N02N1002F 10k
A photovoltaic (PV) application for the LTC4070 is illus-
trated in Figure 6. In this application, transistor Q1 has
been added to further reduce the already low quiescent
current of the LTC4070 to achieve extremely low battery
discharge when the PV cells are not charging the battery.
In long battery life applications, Q1 isolates the battery
from the LTC4070 when Q1’s base voltage falls. Under
normal operation, the PV cells provide current through the
–
+
–
NTCBIAS
C IN LTC4070 R NOM
0.1μF 10k
NTC
T Li-Ion
4070 F06
Figure 6. Photovoltaic Charger with Extremely
Low Leakage When Not Charging
4070fc
11
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4070IDDBTRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Li-Ion/Polymer Shunt Battery Charger System |
| LTC4070IMS8E | 制造商:LINER 制造商全称:Linear Technology 功能描述:Li-Ion/Polymer Shunt Battery Charger System |
| LTC4070IMS8E#PBF | 功能描述:IC BATT CHRGR LIION/POLY 8MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:61 系列:- 功能:电源管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:4.35 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:22-WFDFN 裸露焊盘 供应商设备封装:22-DFN（6x3）裸露焊盘 包装:管件 |
| LTC4070IMS8E#TRPBF | 功能描述:IC BATT CHRGR LIION/POLY 8MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:61 系列:- 功能:电源管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:4.35 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:22-WFDFN 裸露焊盘 供应商设备封装:22-DFN（6x3）裸露焊盘 包装:管件 |
| LTC4070IMS8EPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Li-Ion/Polymer Shunt Battery Charger System |
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