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| 型号： | LTM8061EV-8.4#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/22页 |
| 文件大小： | 0K |
| 描述： | IC BATTERY CHARGER 8.4V 77-LGA |
| 产品培训模块： | LTM806x Step-Down Micro-Module Battery Charger |
| 设计资源： | DC1645A Design Files |
| 特色产品： | μModule Products |
| 标准包装： | 170 |
| 系列： | µModule® |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion）、锂聚合物（Li-Pol） |
| 电源电压： | 4.95 V ~ 32 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 77-BLGA |
| 供应商设备封装： | 77-LGA（15x9） |
| 包装： | 托盘 |
| 配用： | DC1645A-D-ND - BOARD EVAL LTM8061-8.4 |
LTM8061
APPLICATIONS INFORMATION
R CLP
V IN
V IN InputSupply
The LTM8061 is biased directly from the charger input
supply through the V IN pin. This pin carries large switched
currents, so a high quality, low ESR decoupling capacitor
is recommended to minimize voltage glitches on V IN . A
4.7μF capacitor is typically adequate for most charger
applications.
Reverse Protection Diode
The LTM8061 integrates a high voltage power Schottky
diode to provide input reverse voltage protection. The
anode of this diode is connected to V INA , and the cath-
ode is connected to V INC/CLP . There is a small amount of
capacitance at each end; please see the Block Diagram.
BIAS Pin Considerations
The BIAS pin is used to provide drive power for the internal
power switching stage and operate other internal circuitry.
For proper operation, it must be powered by at least 2.9V
and no more than the absolute maximum rating of 10V.
In most applications, connect BIAS to BAT.
When charging a 2-cell battery using a relatively high input
voltage, the LTM8061 power dissipation can be reduced
by connecting BIAS to a 3.3V source.
BAT Decoupling Capacitance
In many applications, the internal BAT capacitance of the
LTM8061 is sufficient for proper operation. There are cases,
however, where it may be necessary to add capacitance or
otherwise modify the output impedance of the LTM8061.
Case 1: the μModule charger is physically located far from
the battery and the added line impedance may interfere with
the control loop. Case 2: the battery ESR is very small or
very large; the LTM8061 controller is designed for a wide
range, but some battery packs have an ESR outside of this
range. Case 3: there is no battery at all. As the charger is
designed to work with the ESR of the battery, the output
may oscillate if no battery is present.
The optimum ESR is about 100m?, but ESR values both
higher and lower will work. Table 1 shows a sample of
parts verified by Linear Technology:
Table 1. Recommended BAT Capacitors
PART NUMBER DESCRIPTION MANUFACTURER
16TQC22M 22μF, 16V, POSCAP Sanyo
35SVPD18M 18μF, 35V, OS-CON Sanyo
TPSD226M025R0100 22μF, 25V Tantalum AVX
T495D226K025AS 22μF, 25V, Tantalum Kemet
TPSC686M006R0150 68μF, 6V, Tantalum AVX
TPSB476M006R0250 47μF, 6V, Tantalum AVX
APXE100ARA680ME61G 68μF, 10V Aluminum Nippon Chemicon
APS-150ELL680MHB5S 68μF, 25V Aluminum Nippon Chemicon
If system constraints preclude the use of electrolytic ca-
pacitors, a series R-C network may be used. Use a ceramic
capacitor of at least 22μF and an equivalent resistance of
100m?.
CLP: Input Current Limit
The LTM8061 contains a PowerPath? control feature to
support multiple load systems. The charger adjusts charge
current in response to a system load if input supply current
exceeds the programmed maximum value. Maximum input
supply current is set by connecting a sense resistor (R CLP )
as shown in Figure 3. The LTM8061 begins to limit the
charge current when the voltage across the sense resistor
is 50mV. The maximum input current is defined by:
R CLP = 0.05/(Max Input Current)
SYSTEM LOAD
LTM8061
INPUT SUPPLY
V INC /CLP
8061 F03
Figure 3. R CLP Sets the Input Supply Current Limit
8061fa
12
For more information www.linear.com/LTM8601
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTM8061IV-4.1#PBF | 功能描述:IC BATTERY CHARGER 4.1V 77-LGA RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:µModule® 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
| LTM8061IV-4.1PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:32V, 2A μModule Li-Ion/ Polymer Battery Charger |
| LTM8061IV-4.2#PBF | 功能描述:IC BATTERY CHARGER 4.2V 77-LGA RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:µModule® 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
| LTM8061IV-4.2PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:32V, 2A μModule Li-Ion/ Polymer Battery Charger |
| LTM8061IV-8.2#PBF | 功能描述:IC BATTERY CHARGER 8.2V 77-LGA RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:µModule® 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
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