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参数资料
| 型号： | LTC4070IDDB#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/16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
( V IN ? V BAT )
I CHG =
The LTC4070 provides a simple, reliable, and high
performance battery protection and charging solution
by preventing the battery voltage from exceeding a
programmed level. Its shunt architecture requires just
one resistor between the input supply and the battery to
handle a wide range of battery applications. When the
input supply is removed and the battery voltage is below
the high battery output threshold, the LTC4070 consumes
just 450nA from the battery.
While the battery voltage is below the programmed float
voltage, the charge rate is determined by the input voltage,
the battery voltage, and the input resistor:
R IN
As the battery voltage approaches the float voltage, the
LTC4070 shunts current away from the battery thereby
reducing the charge current. The LTC4070 can shunt up to
50mA with float voltage accuracy of ±1% over temperature.
The shunt current limits the maximum charge current, but
the 50mA internal capability can be increased by adding
an external P-channel MOSFET.
Adjustable Float Voltage, V FLOAT
A built-in 3-state decoder connected to the ADJ pin provides
three programmable float voltages: 4.0V, 4.1V, or 4.2V.
The float voltage is programmed to 4.0V when ADJ is tied
to GND, 4.1V when ADJ is floating, and 4.2V when ADJ
is tied to V CC . The state of the ADJ pin is sampled about
once every 1.5 seconds. When it is being sampled, the
LTC4070 applies a relatively low impedance voltage at the
ADJ pin. This technique prevents low level board leakage
from corrupting the programmed float voltage.
NTC Qualified Float Voltage, D V FLOAT(NTC)
The NTC pin voltage is compared against an internal
resistor divider tied to the NTCBIAS pin. This divider
has tap points that are matched to the NTC thermistor
resistance/temperature conversion table for a Vishay
thermistor with a B 25/85 value of 3490 at temperatures of
40°C, 50°C, 60°C, and 70°C.
Battery temperature conditioning adjusts the float volt-
age down to V FLOAT_EFF when the NTC thermistor indi-
cates that the battery temperature is too high. For a 10k
thermistor with a B 25/85 value of 3490 such as the Vishay
NTHS0402N02N1002F, and a 10k NTCBIAS resistor, each
10°C increase in temperature above 40°C causes the float
voltage to drop by a fixed amount, D V FLOAT(NTC) , depend-
ing on ADJ. If ADJ is at GND, the float voltage steps down
by 50mV for each 10°C temperature increment. If ADJ
is floating, the step size is 75mV. And if ADJ is at V CC ,
the step size is 100mV. Refer to Table 1 for the range of
V FLOAT_EFF programming.
Table 1. NTC Qualified Float Voltage
V FLOAT_
ADJ D V FLOAT(NTC ) TEMPERATURE V NTC AS % OF NTCBIAS EFF
GND 50mV T < 40°C V NTC > 36.5% 4.000V
40°C ≤ T < 50°C 29.0% < V NTC ≤ 36.5% 3.950V
50°C ≤ T < 60°C 22.8% < V NTC ≤ 29.0% 3.900V
60°C ≤ T < 70°C 17.8% < V NTC ≤ 22.8% 3.850V
70°C < T V NTC ≤ 17.8% 3.800V
Float 75mV T < 40°C V NTC > 36.5% 4.100V
40°C ≤ T < 50°C 29.0% < V NTC ≤ 36.5% 4.025V
50°C ≤ T < 60°C 22.8% < V NTC ≤ 29.0% 3.950V
60°C ≤ T < 70°C 17.8% < V NTC ≤ 22.8% 3.875V
70°C ≤ T V NTC ≤ 17.8% 3.800V
V CC 100mV T < 40°C V NTC > 36.5% 4.200V
40°C ≤ T < 50°C 29.0% < V NTC ≤ 36.5% 4.100V
50°C ≤ T < 60°C 22.8%< V NTC ≤ 29.0% 4.000V
60°C ≤ T < 70°C 17.8% < V NTC ≤ 22.8% 3.900V
70°C ≤ T V NTC ≤ 17.8% 3.800V
For all ADJ pin settings the lowest float voltage setting is
3.8V = V FLOAT – 4 ? D V FLOAT(NTC) = V FLOAT_MIN . This occurs
at NTC thermistor temperatures above 70°C, or if the NTC
pin is grounded.
To conserve power in the NTCBIAS and NTC resistors, the
NTCBIAS pin is sampled at a low duty cycle at the same
time that the ADJ pin state is sampled.
High Battery Status Output: HBO
The HBO pin pulls high when V CC rises to within V HBTH of
the programmed float voltage, V FLOAT_EFF , including NTC
qualified float voltage adjustments.
If V CC drops below the float voltage by more than V HBTH +
V HBHY the HBO pin pulls low to indicate that the battery is
not at full charge. The input supply current of the LTC4070
drops to less than 450nA (typ) as the LTC4070 no longer
shunts current to protect the battery. The NTCBIAS sample
clock slows to conserve power, and the DRV pin is pulled
up to V CC . 4070fc
7
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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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