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参数资料
| 型号： | LTC4070IDDB#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/16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
OPTIONAL
D3
V BAT = 4.1V
R LED2
R LED1
NTCBIAS
R NOM
+
GND
V BAT = 4.1V
V CC
LTC4070
DRV
+
GND
( V CC ? V LED ) < V HBHY ? 50mV
TheLTC4070statuspinshavesufficientdrivestrengthto
use with an LED, for a visual indication of charging status.
Consider the application in Figure 7, where red LED D1 is
connected to the LBO pin and turns off when the battery
voltage is below V LBTH . Note that LED D1 discharges the
battery until V CC falls below V LBTH . Green LED D2, connected
to the HBO pin turns on while the battery is charging. When
the battery voltage rises to within V HBTH of the float voltage
including NTC qualification, V FLOAT_EFF , D2 turns off to
indicate that the battery is no longer charging. Optionally,
a low leakage diode D3 is placed between the cathode of
D2 and the battery. This diode stops D2 from discharging
the battery when the input supply is not present.
In this application, R IN = 205?, is sized for a maximum
shunt current of 50mA that occurs at the maximum input
voltage of 15V and the minimum NTC qualified float voltage
V IN = 8V TO 15V
R IN
205?
1W
BAS416
D2 D1
LTST LTST
C190GKT C190CKT
V CC
LTC4070
1k 1k
LBO 10k
HBO NTC
FLOAT ADJ
T Li-Ion
4070 F07
R NTC : NTHS0402N02N1002F 10k
Figure 7. Single Cell Charger with LED Status and
NTC Qualified Float Voltage
I IN = 500mA
Q1
DMP3015LSS
NTCBIAS
R NOM
LBO 10k
HBO NTC
FLOAT ADJ
T Li-Ion
4070 TA01a
R NTC = NTHS0402N02N1002F 10k
Figure 8. Replace Three NiMH with Lithium
of 3.8V, assuming the voltage drop on diode D3 is 1.1V.
Without the optional D3, R IN increases to 226?.
Figure 8 illustrates an application to replace three NiMH cells
with a single Li-Ion cell. This simple application replaces
the NiMH charging solution without the need for a charge
termination or cell balancing scheme. NiMH charging can
be done without termination, but that algorithm limits the
charge rate to C/10. The LTC4070 application allows the
Li-Ion battery to be charged faster without concern of
over-charging.
Figure 9, 12V Wall Adapter Charging with 205mA, il-
lustrates the use of an external PFET transistor to boost
the maximum shunt current. If the battery voltage is
3.6V the battery receives the full charge current of
about 205mA. If the battery temperature is below 40°C,
the float voltage rises to 4.1V (ADJ = floating) then Q1
and the LTC4070 shunts 192mA away from the battery.
If the battery temperature rises, the shunt current increases
to regulate the float voltage 75mV lower per 10°C rise in
battery temperature, as described in Table 1. At a maximum
shunt current of 200mA the minimum float voltage is held
at 3.8V when the battery temperature is above 70°C.
This example illustrates an alternative use of a LED, D1, to
observe the HBO status pin. This LED turns on to provide
a visual indication that the battery is fully charged, and
shunts about 1.5mA when the battery rises to within 40mV
of the desired float voltage. LED D1 discharges the battery,
when no supply is present, until V CC falls by more than
V HBTH + V HBHY below the float voltage. When using an
LED with the HBO pin in this configuration, it is important
to limit the LED current with a resistor, R LED as shown.
Otherwise the step in current through R IN that occurs when
the LED turns on may pull V CC below the HBO hysteresis.
To prevent that situation, the ratio of R IN to R LED should
be selected to meet the following relation:
R IN
R LED
where V LED is the forward voltage drop of the LED and a
margin of 50mV is subtracted from the HBO hysteresis.
A V LED value of 1.1V is assumed for this example. Refer
to the LED data sheet for the forward voltage drop at the
applied current level.
4070fc
12
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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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