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| 型号： | LT3650EMSE-8.4#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/22页 |
| 文件大小： | 0K |
| 描述： | IC BATTERY CHARGER LI 12MSOP |
| 标准包装： | 37 |
| 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： | 9 V ~ 32 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 12-TSSOP （0.118"，3.00mm 宽）裸露焊盘 |
| 供应商设备封装： | 12-MSOP，裸露焊盘 |
| 包装： | 管件 |
| 产品目录页面： | 1340 (CN2011-ZH PDF) |
LT3650-8.2/LT3650-8.4
APPLICATIONS INFORMATION
I CVIN(RMS) ? I CHG(MAX) ? ? BAT ? ? ? ? IN ? ? 1 ?
? V IN ? ? ? V BAT ? ?
? ? ( μF )
C IN(BULK) = I MAX ? ? BAT
V IN InputSupply
The LT3650 is biased directly from the charger input supply
through the V IN pin. This supply provides large switched
currents, so a high quality, low ESR decoupling capacitor
is recommended to minimize voltage glitches on V IN . The
V IN decoupling capacitor (C VIN ) absorbs all input switching
ripple current in the charger, so it must have an adequate
ripple current rating. RMS ripple current (I CVIN(RMS) ) is:
1
? V ? ? ? V ? ? 2
?
which has a maximum at V IN = 2 ? V BAT , where:
I CVIN(RMS) = I CHG(MAX) /2
The simple worst-case of 1/2 ? I CHG(MAX) is commonly
used for design.
Bulk capacitance is a function of desired input ripple volt-
age (?V IN ), and follows the relation:
? V / V IN ?
? ?V IN
10μF is typically adequate for most charger applications.
BOOST Supply
The BOOST bootstrapped supply rail drives the internal
switch and facilitates saturation of switch transistor. Oper-
ating range of the BOOST pin is 0V to 8.5V, as referenced
to the SW pin. Connect a 1μF or greater capacitor from
the BOOST pin to the SW pin.
The voltage on the decoupling capacitor is refreshed
through a diode, with the anode connected to/from either
the battery output voltage or an external source, and the
cathode connected to the BOOST pin. Rate the diode av-
erage current greater than 0.1A, and its reverse voltages
greater than V IN(MAX) .
V IN / BOOST Start-Up Requirement
The LT3650 operates with a V IN range of 9V to 32V,
however, a start-up voltage requirement exists due to
the nature of the nonsynchronous step-down switcher
topology used for the charger. If there is no BOOST supply
available, the internal switch requires (V IN – V SW ) > 3V
to operate. This requirement does not exist if the BOOST
supply is available and (V BOOST – V SW ) > 2V.
When an LT3650 charger is not switching, the SW pin is at
the same potential as the battery, which can be as high as
V BAT(FLT) . For reliable start-up, the V IN supply must be at
least 3V above the SW pin. The minimum start-up speci-
fication of V IN at or above 11.5V provides ample margin
to satisfy this requirement. Once switching begins, the
BOOST supply capacitor gets charged such that (V BOOST
– V SW ) > 2V, and the V IN requirement no longer applies.
In low V IN applications, the BOOST supply can be powered
by an external source for start-up, eliminating the V IN
start-up requirement.
V BAT Output Decoupling
An LT3650 charger output requires bypass capacitance
connected from the BAT pin to ground (C BAT ). A 10μF ce-
ramic capacitor is required for all applications. In systems
where the battery can be disconnected from the charger
output, additional bypass capacitance may be desired for
visual indication of a no-battery condition (see the Status
Pins section).
If it is desired to operate a system load from the LT3650
charger output when the battery is disconnected, additional
bypass capacitance is required. In this type of application
with the charger being used as a DC/DC converter, exces-
sive ripple and/or low amplitude oscillations can occur
without additional output bulk capacitance. For these ap-
plications, place a 100μF low ESR nonceramic capacitor
(chip tantalum or organic semiconductor capacitors such
as Sanyo OS-CONs or POSCAPs) from BAT to ground,
in parallel with the 10μF ceramic bypass capacitor. This
additional bypass capacitance may also be required in
systems where the battery is connected to the charger
through long wires. The voltage rating on C BAT must meet
or exceed the battery float voltage.
36508284fd
11
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相关代理商/技术参数 |
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| LT3650IDD-4.1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Voltage 2 Amp Monolithic Li-Ion Battery Charger |
| LT3650IDD-4.1#PBF | 功能描述:IC CHARGER LI-ION 2A 12-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 其它有关文件:STC3100 View All Specifications 特色产品:STC3100 - Battery Monitor IC 标准包装:4,000 系列:- 功能:燃料，电量检测计/监控器 电池化学:锂离子（Li-Ion） 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-MiniSO 包装:带卷 (TR) 其它名称:497-10526-2 |
| LT3650IDD-4.1#TRPBF | 功能描述:IC CHARGER LI-ION 4.1V 2A 12-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 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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| LT3650IDD-4.1TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Voltage 2 Amp Monolithic Li-Ion Battery Charger |
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