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| 型号： | LT3844EFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 20/24页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST INV PWM 16TSSOP |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 330kHz |
| 占空比： | 95% |
| 电源电压： | 4 V ~ 60 V |
| 降压： | 是 |
| 升压： | 是 |
| 回扫： | 无 |
| 反相： | 是 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 带卷 (TR) |
LT3844
APPLICATIONS INFORMATION
The choice of output capacitor is also driven by the RMS
ripple current requirement. The RMS ripple current is:
Please note that the input capacitor can see a very high
surge current when a battery is suddenly connected to
I RMS ( COUT ) = I OUT ( MAX ) ?
V OUT ? V IN(MIN)
V IN ( MIN )
the input of the converter and solid tantalum capacitors
can fail catastrophically under these conditions. Be sure
to specify surge-tested capacitors.
At lower output voltages (<30V) it may be possible to sat-
isfy both the output ripple voltage and RMS requirements
with one or more capacitors of a single type. However, at
output voltages above 30V where capacitors with both low
ESR and high bulk capacitance are hard to ?nd, the best
approach is to use a combination of aluminum electrolytic
and ceramic capacitors. The low ESR ceramic capacitor
will minimize the ESR while the Aluminum Electrolytic
capacitor will supply the required bulk capacitance.
Boost Converter: Input Capacitor Selection
The input capacitor of a boost converter is less critical
than the output capacitor, due to the fact that the inductor
is in series with the input and the input current waveform
is continuous. The input voltage source impedance de-
termines the size of the input capacitor, which is typically
in the range of 10μF to 100μF. A low ESR capacitor is
recommended though not as critical as with the output
capacitor. The RMS input capacitor ripple current for a
boost converter is:
Boost Converter: R SENSE Selection
The boost application in the Typical Applications section
has the location of the current sense resistor in series with
the inductor with one side referenced to V IN . This location
was chosen for two reasons. Firstly, the circulating current
is always monitored so in the case of an output overvoltage
or input overcurrent condition the main switch will skip
cycles to protect the circuitry. Secondly, the V IN node can
be considered low noise since it is heavily ?ltered and the
input current is not pulsed but continuous.
In the case where the input voltage exceeds the voltage
limits on the LT3844 Sense pins, the sense resistor can
be moved to the source of the MOSFET. In both cases the
resistor value is the calculated using the same formula.
The LT3844 current comparator has a maximum threshold
of 100mV/R SENSE . The current comparator threshold sets
the peak of the inductor current. Allowing adequate margin
for ripple current and external component tolerances,
R SENSE can be calculated as follows:
I RMS ( CIN ) = 0 . 3 ?
V IN(MIN)
L ? f SW
? DC MAX
R SENSE =
70mV
I L ( MAX )
Where I L(MAX) is the maximum average inductor current
as calculated in the Boost Converter: Inductor Selection
section.
3844fb
20
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3844IFE | 制造商:Linear Technology 功能描述:DC DC Cntrlr Single-OUT Step Down 4V to 60V Input 16-Pin TSSOP EP |
| LT3844IFE#PBF | 功能描述:IC REG CTRLR BST INV PWM 16TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LT3844IFE#TRPBF | 功能描述:IC REG CTRLR BST INV PWM 16TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LT3844IFEPBF | 制造商:Linear Technology 功能描述:DC-DC Controller Step-Down 4-60V TSSOP16 |
| LT3844IFE-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Voltage, Current Mode Switching Regulator Controller with Programmable Operating Frequency |
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