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参数资料
| 型号： | LTC4070IDDB#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/16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
APPLICATIONS INFORMATION
24V WALL
NTCBIAS
DRV
Q1
+ Li-Ion
V CC1
R IN
NTCBIAS
+ Li-Ion
GND
BATTERY
NTCBIAS
+ Li-Ion
GND
BATTERY
R IN
110?
4W
ADAPTER
NTC V CC
LTC4070
FLOAT
IF NOT NEEDED
ADJ
GND BATTERY
Q1: FDN352AP 4070 F02
Figure 2. Single-Cell Charger with Boosted Drive
WALL
ADAPTER
NTC V CC
LTC4070
FLOAT
IF NOT NEEDED
FLOAT ADJ
V CC2
NTC V CC
LTC4070
FLOAT
IF NOT NEEDED
FLOAT ADJ
4070 F03
Figure 2 shows a charge circuit that can boost the charge
current as well as the shunt current with an external
P-channel MOSFET, Q1. In this case, if the wall adapter
voltage (V WALL ) is 24V and the minimum battery voltage
(V BAT ) is 3V, then the initial charge current is set to 191mA
by selecting R IN = 110?. Note that this resistor dissipates
over 4W of power, so select the resistor taking power rating
into account. When the battery voltage reaches the float
voltage, the LTC4070 and the external P-channel MOSFET
begin to shunt current from the wall adapter. Eventually,
the LTC4070 and the external P-channel MOSFET shunts
all available current (182mA) and no current flows to the
battery. Take the full shunt current and power into account
when selecting the external MOSFET.
The LTC4070 can also be used to regulate series-connected
battery stacks as illustrated in Figures 3 and 4. Here two
LTC4070 devices are used to charge two batteries in series;
with or without boosted drive. A single resistor sets the
maximum charge/shunt current. The GND pin of the top
device is simply connected to the V CC pin of the bottom
device. Care must be taken in observing the status output
pins of the top device as these signals are not ground ref-
erenced. Also, the wall adapter must have a high enough
voltage rating to charge both cells.
NTC Protection
V CC1
R IN
FLOAT
IF NOT NEEDED
Figure3.2-CellBatteryCharger
WALL
ADAPTER
NTC V CC
LTC4070
NTCBIAS DRV
FLOAT ADJ
GND
Q1
+ Li-Ion
BATTERY
The LTC4070 measures battery temperature with a negative
temperature coefficient thermistor thermally coupled to the
battery. NTC thermistors have temperature characteristics
which are specified in resistance-temperature conversion
tables. Internal NTC circuitry protects the battery from
excessive heat by reducing the float voltage for each
10°C rise in temperature above 40°C (assuming a Vishay
thermistor with a B 25/85 value of 3490).
FLOAT
IF NOT NEEDED
FLOAT
NTC
LTC4070
NTCBIAS
ADJ
Q1, Q2: Si3469DV
V CC2
V CC
DRV
GND
Q2
+ Li-Ion
BATTERY
4070 F04
The LTC4070 uses a ratio of resistor values to measure
battery temperature. The LTC4070 contains an internal fixed
resistor voltage divider from NTCBIAS to GND with four tap
points; NTC TH1 -NTC TH4 . The voltages at these tap points
are periodically compared against the voltage at the NTC
pin to measure battery temperature. To conserve power,
the battery temperature is measured periodically by biasing
the NTCBIAS pin to V CC about once every 1.5 seconds.
Figure 4. 2-Cell Battery Charger with Boosted Drive
4070fc
9
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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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