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參數(shù)資料
| 型號： | LTM8052IV#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PBGA81 |
| 封裝： | 15 X 11.25 MM, 2.82 MM HEIGHT, ROHS COMPLIANT, MO-222, LGA-81 |
| 文件頁數(shù)： | 6/28頁 |
| 文件大?。?/td> | 350K |
| 代理商： | LTM8052IV#PBF |
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LTM8052
14
8052f
applicaTions inForMaTion
graphs in the Typical Performance Characteristics section
for guidance.
The maximum frequency (and attendant RT value) at
which the LTM8052 should be allowed to switch is given
in Table 1 in the fMAX column, while the recommended
frequency (and RT value) for optimal efficiency over the
given input condition is given in the fOPTIMAL column.
There are additional conditions that must be satisfied if
the synchronization function is used. Please refer to the
Synchronization section for details.
Capacitor Selection Considerations
The CIN and COUT capacitor values in Table 1 are the
minimum recommended values for the associated oper-
ating conditions. Applying capacitor values below those
indicated in Table 1 is not recommended, and may result
in undesirable operation. Using larger values is generally
acceptable, and can yield improved dynamic response, if
necessary. Again, it is incumbent upon the user to verify
proper operation over the intended system’s line, load and
environmental conditions.
Ceramiccapacitorsaresmall,robustandhaveverylowESR.
However, not all ceramic capacitors are suitable. X5R and
X7Rtypesarestableovertemperature,appliedvoltageand
give dependable service. Other types, including Y5V and
Z5U have very large temperature and voltage coefficients
of capacitance. In an application circuit they may have only
a small fraction of their nominal capacitance resulting in
much higher output voltage ripple than expected.
Many of the output capacitances given in Table 1 specify
an electrolytic capacitor. Ceramic capacitors may also be
used in the application, but it may be necessary to use
more of them. Many high value ceramic capacitors have a
large voltage coefficient, so the actual capacitance of the
component at the desired operating voltage may be only
a fraction of the specified value. Also, the very low ESR of
ceramic capacitors may necessitate additional capacitors
for acceptable stability margin.
A final precaution regarding ceramic capacitors concerns
the maximum input voltage rating of the LTM8052. A
ceramic input capacitor combined with trace or cable
inductance forms a high Q (under damped) tank circuit.
If the LTM8052 circuit is plugged into a live supply, the
input voltage can ring to twice its nominal value, possi-
bly exceeding the device’s rating. This situation is easily
avoided; see the Hot Plugging Safely section.
Programming Switching Frequency
The LTM8052 has an operational switching frequency
range between 100kHz and 1MHz. This frequency is
programmed with an external resistor from the RT pin to
ground.Donotleavethispinopenunderanycircumstance.
See Table 2 for resistor values and the corresponding
switching frequencies.
Table 2. RT Resistor Values and Their Resultant Switching
Frequencies
SWITCHING FREQUENCY (MHz)
RT (kΩ)
1
39.2
0.75
53.6
0.5
82.5
0.3
140
0.2
210
0.1
453
In addition, the Typical Performance Characteristics sec-
tion contains a graph that shows the switching frequency
versus RT value.
Switching Frequency Trade-Offs
It is recommended that the user apply the optimal RT
value given in Table 1 for the input and output operating
condition. System level or other considerations, however,
may necessitate another operating frequency. While the
LTM8052 is flexible enough to accommodate a wide range
of operating frequencies, a haphazardly chosen one may
result in undesirable operation under certain operating or
fault conditions. A frequency that is too high can reduce
efficiency, generate excessive heat or even damage the
LTM8052 in some fault conditions. A frequency that is too
low can result in a final design that has too much output
ripple or too large of an output capacitor.
Switching Frequency Synchronization
The nominal switching frequency of the LTM8052 is
determined by the resistor from the RT pin to GND and
may be set from 100kHz to 1MHz. The internal oscillator
may also be synchronized to an external clock through
the SYNC pin. The external clock applied to the SYNC pin
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相關代理商/技術參數(shù) |
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| LTM8061 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:32V, 2A μModule Li-Ion/ Polymer Battery Charger |
| LTM8061EV-4.1#PBF | 功能描述:IC BATTERY CHARGER 4.1V 77-LGA RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:µModule® 其它有關文件:STC3100 View All Specifications 特色產(chǎn)品:STC3100 - Battery Monitor IC 標準包裝:4,000 系列:- 功能:燃料，電量檢測計/監(jiān)控器 電池化學:鋰離子（Li-Ion） 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應商設備封裝:8-MiniSO 包裝:帶卷 (TR) 其它名稱:497-10526-2 |
| LTM8061EV-4.1PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:32V, 2A μModule Li-Ion/ Polymer Battery Charger |
| LTM8061EV-4.2#PBF | 功能描述:IC BATTERY CHARGER 4.2V 77-LGA RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:µModule® 其它有關文件:STC3100 View All Specifications 特色產(chǎn)品:STC3100 - Battery Monitor IC 標準包裝:4,000 系列:- 功能:燃料，電量檢測計/監(jiān)控器 電池化學:鋰離子（Li-Ion） 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應商設備封裝:8-MiniSO 包裝:帶卷 (TR) 其它名稱:497-10526-2 |
| LTM8061EV-4.2PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:32V, 2A μModule Li-Ion/ Polymer Battery Charger |
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