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參數(shù)資料
| 型號： | LTC3536IMSE#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, PDSO12 |
| 封裝： | LEAD FREE, PLASTIC, MSOP-12 |
| 文件頁數(shù)： | 5/28頁 |
| 文件大?。?/td> | 1088K |
| 代理商： | LTC3536IMSE#PBF |
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LTC3536
13
3536f
reducing the peak current to be closer to the average out-
put current and therefore minimize resistive losses due to
high RMS currents. However, a larger inductor within any
given inductor family will generally have a greater series
resistance,therebycounteractingthisefficiencyadvantage.
An inductor used in LTC3536 applications should have a
saturationcurrentratingthatisgreaterthantheworst-case
average inductor current plus half the ripple current. The
peak-to-peak inductor current ripple for each operational
mode can be calculated from the following formula, where
f is the switching frequency in MHz, L is the inductance
in H.
IL(P-P)(BUCK) =
VOUT
f L
VIN – VOUT
VIN
IL(P-P)(BOOST) =
VIN
f L
VOUT – VIN
VOUT
In addition to its influence on power conversion efficiency,
the inductor DC resistance can also impact the maximum
output capability of the buck-boost converter particularly
at low input voltages. In buck mode, the output current of
the buck-boost converter is limited only by the inductor
current reaching the current limit threshold. However, in
boost mode, especially at large step-up ratios, the output
current capability can also be limited by the total resistive
losses in the power stage. These include switch resis-
tances, inductor resistance and PCB trace resistance. Use
of an inductor with high DC resistance can degrade the
output current capability from that shown in the Typical
Performance Characteristics section of this data sheet.
As a guideline, in most applications the inductor DC re-
sistance should be significantly smaller than the typical
power switch resistance of 120mΩ.
The minimum inductor value must guarantee that the
worst-case average input current plus half the ripple
current don’t reach the input current limit threshold.
For a switching frequency of 1MHz the recommended
typical inductor value is 4.7H. For a higher and lower
switching frequency the inductor value should be changed
APPLICATIONS INFORMATION
accordingly in order to have the same current ripple
(2.2H for 2MHz, 15H for 300kHz).
Differentinductorcorematerialsandstyleshaveanimpact
on the size and price of an inductor at any given current
rating. Shielded construction is generally preferred as it
minimizes the chances of interference with other circuitry.
Thechoiceofinductorstyledependsupontheprice,sizing,
and EMI requirements of a particular application. Table 1
provides a small sampling of inductors that are well suited
to many LTC3536 applications.
Table 1. Recommended Inductors
VENDOR
PART/STYLE
Coilcraft
847-639-6400
www.coilcraft.com
LPO2506
LPS4012, LPS4018
MSS6122
MSS4020
MOS6020
DS1605, DO1608
XPL4020
XAL4040
XFL4020
Coiltronics
www.cooperet.com
SD52, SD53
SD3114, SD311B
Murata
714-852-2001
www.sumida.com
LQH55D
Sumida
847-956-0666
www.sumida.com
CDH40D11
Taiyo Yuden
www.t-yuden.com
NP04S8
NR3015
NR4018
TDK
847-803-6100
www.component.tdk.com
VLP, LTF
VLF, VLCF
Würth Elektronik
201-785-8800
www.we-online.com
WE-TPC Type S, M, MH
Output Capacitor Selection
A low ESR output capacitor should be utilized at the buck-
boost converter output in order to minimize output voltage
ripple.Multilayerceramiccapacitorsareanexcellentoption
as they have low ESR and are available in small footprints.
The capacitor value should be chosen large enough to
reduce the output voltage ripple to acceptable levels.
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| LTC3537 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:2.2 MHz, 600mA Synchronous Step-Up DC/DC Converter and 100mA LDO |
| LTC3537EUD#PBF | 功能描述:IC REG DL BST/LINEAR SYNC 16-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 + 切換式 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 拓撲:降壓（降壓）同步（3），線性（LDO）（2） 功能:任何功能 輸出數(shù):5 頻率 - 開關(guān):300kHz 電壓/電流 - 輸出 1:控制器 電壓/電流 - 輸出 2:控制器 電壓/電流 - 輸出 3:控制器 帶 LED 驅(qū)動器:無 帶監(jiān)控器:無 帶序列發(fā)生器:是 電源電壓:5.6 V ~ 24 V 工作溫度:-40°C ~ 85°C 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:* |
| LTC3537EUD#TRPBF | 功能描述:IC REG DL BST/LINEAR SYNC 16-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 + 切換式 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 拓撲:降壓（降壓）同步（3），線性（LDO）（2） 功能:任何功能 輸出數(shù):5 頻率 - 開關(guān):300kHz 電壓/電流 - 輸出 1:控制器 電壓/電流 - 輸出 2:控制器 電壓/電流 - 輸出 3:控制器 帶 LED 驅(qū)動器:無 帶監(jiān)控器:無 帶序列發(fā)生器:是 電源電壓:5.6 V ~ 24 V 工作溫度:-40°C ~ 85°C 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:* |
| LTC3537EUD-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:2.2 MHz, 600mA Synchronous Step-Up DC/DC Converter and 100mA LDO |
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