參數(shù)資料
型號(hào)： LTC3565IMSE#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： 2.5 A SWITCHING REGULATOR, 4000 kHz SWITCHING FREQ-MAX, PDSO10
封裝： LEAD FREE, PLASTIC, MSOP-10
文件頁(yè)數(shù)： 6/22頁(yè)
文件大?。?/td> 587K
代理商： LTC3565IMSE#PBF
LTC3565
3565fa
drop of the first cycle. Thus, a good place to start is with
the output capacitor value of approximately:
COUT ≈ 2.5
ΔIOUT
fO VDROOP
More capacitance may be required depending on the duty
cycle and load step requirements.
Inmostapplications,theinputcapacitorismerelyrequired
to supply high frequency bypassing, since the impedance
to the supply is very low. A 10F ceramic capacitor is
usually enough for these conditions.
Setting the Output Voltage
The LTC3565 develops a 0.6V reference voltage between
the feedback pin, VFB, and the signal ground as shown in
Figure 4. The output voltage is set by a resistive divider
according to the following formula:
VOUT ≈ 0.6V 1+
R2
R1
Keeping the current small (<5A) in these resistors maxi-
mizes efficiency, but making them too small may allow
stray capacitance to cause noise problems and reduce the
phase margin of the error amp loop.
Toimprovethefrequencyresponse,afeed-forwardcapaci-
tor CF may also be used. Great care should be taken to
route the VFB line away from noise sources, such as the
inductor or the SW line.
Shutdown and Soft-Start
Pulling the RUN pin high allows an internal soft-start circuit
to slowly ramp the output voltage up until regulation.
Soft-start prevents surge currents from VIN by gradually
ramping the output voltage up during start-up. The output
will ramp from zero to full scale over a time period of ap-
proximately0.9ms.ThispreventstheLTC3565fromhaving
to quickly charge the output capacitor and thus supplying
an excessive amount of instantaneous current.
The LTC3565 can start into a back-biased output in force
continuous operation. When the output is pre-biased at
either a higher or lower value than the regulated output
voltage, the LTC3565 will sink or source current as needed
to bring the output back into regulation. However, during
soft-start the regulator will always start in pulse skip
mode ignoring the mode selected with the SYNC/MODE
pin. This prevents the output from discharging to below
the regulation point when soft-starting.
Mode Selection and Frequency Synchronization
The SYNC/MODE pin is a multipurpose pin which provides
mode selection and frequency synchronization. Connect-
ing this pin to VIN enables Burst Mode operation, which
provides the best low current efficiency at the cost of a
higher output voltage ripple. When this pin is connected to
ground,pulseskippingoperationisselectedwhichprovides
the lowest output voltage and current ripple at the cost
of low current efficiency. Applying a voltage that is half
the value of the input voltage results in forced continuous
mode, which creates a fixed output ripple and is capable of
sinking up to 0.4A. Since the switching noise is constant
in this mode, it is also the easiest to filter out.
The LTC3565 can also be synchronized to an external
clock signal by the SYNC/MODE pin. The internal oscilla-
tor frequency should be set to ±20% of the external clock
frequency to ensure adequate slope compensation, since
slope compensation is derived from the internal oscillator.
During synchronization, the mode is set to pulse skipping
and the top switch turn on is synchronized to the falling
edge of the external clock.
applications inForMation
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參數(shù)描述
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LTC3566EUF#PBF 功能描述:IC USB POWER MANAGER 24-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:50 系列:- 應(yīng)用:熱電冷卻器 電流 - 電源:- 電源電壓:3 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.173"，4.40mm 寬）裸露焊盤 供應(yīng)商設(shè)備封裝:28-TSSOP 裸露焊盤 包裝:管件 產(chǎn)品目錄頁(yè)面:1410 (CN2011-ZH PDF)
LTC3566EUF#TRPBF 功能描述:IC USB POWER MANAGER 24-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 應(yīng)用:手持/移動(dòng)設(shè)備 電流 - 電源:- 電源電壓:3 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:14-LLP-EP（4x4） 包裝:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名稱:LP3905SD-30DKR
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