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参数资料
| 型号： | LTC4070IDDB#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/16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
OPERATION
For example, if the NTC thermistor requires the float voltage
to be dropped by 100mV (ADJ = V CC and 0.29 ?V NTCBIAS
< V NTC < 0.36 ?V NTCBIAS ) then the HBO rising threshold
is detected when V CC rises past V FLOAT – D V FLOAT(NTC) –
V HBTH = 4.2V – 100mV – 40mV = 4.06V. The HBO falling
threshold in this case is detected when V CC falls below
V FLOAT – D V FLOAT(NTC) – V HBTH – V HBHY = 4.2V – 100mV
– 40mV – 100mV = 3.96V.
APPLICATIONS INFORMATION
General Charging Considerations
The LTC4070 uses a different charging methodology from
previous chargers. Most Li-Ion chargers terminate the
charging after a period of time. The LTC4070 does not have
a discrete charge termination. Extensive measurements
on Li-Ion cells show that the cell charge current drops to
nanoamps with the shunt charge control circuit effectively
terminating the charge. For long cell life, operate the charger
at 100mV lower charge voltage normally used.
The simplest application of the LTC4070 is shown in
Figure 1. This application requires only an external resis-
tor to program the charge/shunt current. Assume the wall
adapter voltage (V WALL ) is 12V and the minimum battery
voltage (V BAT_MIN ) is 3V, then the maximum charge cur-
rent is calculated as:
Low Battery Status Output: LBO
When the battery voltage drops below 3.2V, the LBO pin
pulls high. Otherwise, the LBO pin pulls low when the
battery voltage exceeds about 3.5V.
While the low battery condition persists, NTC and ADJ pins
are no longer sampled—the functions are disabled—and
total supply consumption for the LTC4070 drops to less
than 300nA (typ).
only 450nA of current, and all of the input current flows
into the battery. As the battery voltage reaches the
float voltage, the LTC4070 shunts current from the wall
adapter and regulates the battery voltage to V FLOAT . The
more shunt current the LTC4070 sinks, the less charge
current the battery gets. Eventually, the LTC4070 shunts
all the current from the battery; up to the maximum shunt
current. The maximum shunt current in this case, with no
NTC adjustment, is determined by the input resistor and
is calculated as:
I SHUNT _ MAX = ( V WALL ? V FLOAT ) = ( 12V ? 4.1V ) = 49mA
R IN 162 Ω
At this point the power dissipated in the input resistor is
388mW.
( 12V ? 3V )
162 Ω
I MAX _ CHARGE =
=
( V WALL ? V BAT _ MIN )
R IN
= 55.5mA
12V WALL
ADAPTER
R IN
162?
0.5W
NTC
LTC4070
V CC
( V WALL ? V BAT _ MIN )
( 12V ? 3V ) 2
P DISS = = = 0.5W
NTCBIAS
+ Li-Ion
GND
BATTERY
Caremustbetakeninselectingtheinputresistor.Power
dissipated in R IN under full charge current is given by the
following equation:
2
R IN 162 Ω
The charge current decreases as the battery voltage
increases. If the rising battery voltage is 40mV less than
the programmed float voltage, the LTC4070 consumes
FLOAT
IF NOT NEEDED
FLOAT ADJ
4070 F01
Figure 1. Single-Cell Battery Charger
4070fc
8
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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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