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參數(shù)資料
| 型號： | LTC3536EDD#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 4 A SWITCHING REGULATOR, 1440 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | 3 X 3 MM, LEAD FREE, PLASTIC, MO-229WEED-2, DFN-10 |
| 文件頁數(shù)： | 4/28頁 |
| 文件大小： | 1088K |
| 代理商： | LTC3536EDD#PBF |
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LTC3536
12
3536f
OPERATION
soft-start period is reset by thermal shutdown and UVLO
events on VIN and the mode of operation is always PWM.
Incasetheoutputvoltageatstart-upisalreadyprecharged
above 90% (typically) of the target value, the internal soft-
start is skipped and the LTC3536 immediately enters the
mode of operation that has been set on the MODE pin.
If the MODE pin is tied high and Burst Mode operation is
selected, the output voltage is regulated smoothly to the
targetvoltagevalue.InsteadiftheMODEpinistiedlowand
PWM mode is selected, the error amplifier needs to charge
up the VC pin and the output voltage might be pulled to
lowervoltagevaluesforashortperiodoftime,proportional
to the value of the main compensation capacitor.
UNDERVOLTAGE LOCKOUT
To ensure proper operation, the LTC3536 incorporates
internal undervoltage lockout (UVLO) circuitry. The con-
verter is disabled if VIN falls below its respective UVLO
threshold (typical 1.67V). If the input voltage falls below
this level all switching is disabled until the input voltage
rises above 1.75V (nominal).
THERMAL CONSIDERATIONS
ThepowerswitchesintheLTC3536aredesignedtooperate
continuously with currents up to the internal current limit
thresholds.However,whenoperatingathighcurrentlevels
there may be significant heat generated within the IC. As a
result, careful consideration must be given to the thermal
environment of the IC in order to optimize efficiency and
ensure that the LTC3536 is able to provide its full-rated
output current. Specifically, the exposed pad of both the
DD and MSOP packages shall be soldered to the PC board
and the PC board should be designed to maximize the
conduction of heat out of the IC package.
If the die temperature exceeds approximately 165°C, the
IC will enter overtemperature shutdown and all switching
will be inhibited. The part will remain disabled until the
die cools by approximately 10°C. The soft-start circuit
is reinitialized in overtemperature shutdown to provide
a smooth recovery when the fault condition is removed.
If the SHDN pin is driven externally to a level higher than
VIN, a current limiting resistor should be used. 1M for 6V
on the SHDN pin limits the current to 6A. Also, a Schottky
diode from the SHDN pin to VIN can be used in addition
to current limiting resistor.
The standard LTC3536 application circuit is shown as the
Typical Application onthe frontpage ofthis datasheet.The
appropriateselectionofexternalcomponentsisdependent
upon the required performance of the IC in each particular
application given considerations and trade-offs such as
PCB area, cost, output and input voltage, allowable ripple
voltage,efficiencyandthermalconsiderations.Thissection
of the data sheet provides some basic guidelines and con-
siderations to aid in the selection of external components
and the design of the application circuit.
APPLICATIONS INFORMATION
Inductor Selection
influences the maximum deliverable output current, the
magnitude of the inductor current ripple, and the power
conversion efficiency. The inductor must have low DC
seriesresistanceoroutputcurrentcapabilityandefficiency
will be compromised. Larger inductance values reduce
inductor current ripple and will therefore generally yield
greateroutputcurrentcapability.ForafixedDCresistance,
a larger value of inductance will yield higher efficiency by
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| LTC3536EMSE#PBF | 功能描述:IC REG BUCK BST SYNC ADJ 12MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:250 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開關(guān):2MHz 電流 - 輸出:500mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:6-UFDFN 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:6-SON（1.45x1） 產(chǎn)品目錄頁面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
| LTC3536EMSE#TRPBF | 功能描述:IC REG BUCK BST SYNC ADJ 12MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤 |
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