- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄44990 > LTC3112EDHD#PBF (LINEAR TECHNOLOGY CORP) 12 A SWITCHING REGULATOR, 825 kHz SWITCHING FREQ-MAX, PDSO16 PDF資料下載
參數(shù)資料
| 型號： | LTC3112EDHD#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 12 A SWITCHING REGULATOR, 825 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 5 X 4 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, MO-229WJGD-2, DFN-16 |
| 文件頁數(shù)： | 7/32頁 |
| 文件大?。?/td> | 651K |
| 代理商： | LTC3112EDHD#PBF |
第1頁第2頁第3頁第4頁第5頁第6頁當(dāng)前第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁
LTC3112
15
3112f
APPLICATIONS INFORMATION
Where f is the switching frequency in Hz and L is the
inductor value in Henries.
In addition to affecting output current ripple, the size of the
inductor can also impact the stability of the feedback loop.
In boost mode, the converter transfer function has a right
half plane zero at a frequency that is inversely proportional
to the value of the inductor. As a result, a large inductor
can move this zero to a frequency that is low enough
to degrade the phase margin of the feedback loop. It is
recommended that the inductor value be chosen less than
15μH if the converter is to be used in the boost region.
For 750kHz operation, a 4.7μH inductor is recommended
for 5VOUT and a 10μH inductor for 12VOUT.
The inductor DC resistance can impact the efciency of
the buck-boost converter as well as the maximum output
current capability at low input voltage. In buck mode,
the output current is limited only by the inductor current
reaching the current limit value. 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 resistances,
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 graph in the Typical
Performance Characteristics section of this data sheet.
Different inductor core materials and styles have an impact
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.
The choice of inductor style depends upon the price, sizing,
and EMI requirements of a particular application. Table 1
provides a small sampling of inductors that are well suited
to many LTC3112 buck-boost converter applications. All
inductor specications are listed at an inductance value
of 4.7μH for comparison purposes but other values within
these inductor families are generally well suited to this
application. Within each family (i.e. at a xed size), the DC
resistance generally increases and the maximum current
generally decreases with increased inductance.
Table 1. Representative Buck-Boost Surface Mount Inductors
PART NUMBER
VALUE
(μH)
DCR
(mΩ)
MAX I
(A)
SIZE (mm)
W
× L × H
Coilcraft XPL7030-472ML
4.7
40.1
6.8
7
× 7 × 3
Coilcraft MSS1048-472NLB
4.7
12.3
6.46
10
× 10 × 4.8
Würth 744 311 470
4.7
24
6
7
× 6.9 × 3.8
Cooper Bussmann HC8-4R5-R
4.5
18.6
7.7
10.9
× 10.4 × 4
OUTPUT CAPACITOR SELECTION
A low-ESR output capacitor should be utilized at the buck-
boost converter output in order to minimize output volt-
age ripple. Multilayer ceramic capacitors are an excellent
choice as they have low ESR and are available in small
footprints. The capacitor should be chosen large enough
to reduce the output voltage ripple to acceptable levels.
The minimum output capacitor needed for a given output
voltage ripple (neglecting ESR and ESL) can be calculated
by the following formulas:
COUT =
1
ΔVPP, BUCK 8 L f
2
VIN VOUT
()V
OUT
VIN
COUT =
ILOAD VOUT VIN
()
ΔVPP, BOOST VOUT f
where f is the frequency in MHz, COUT is the capacitance
in μF, L is the inductance in μH, and ILOAD is the output
current in Amps.
Given that the output current is discontinuous in boost
mode, the ripple in this mode will generally be much
larger than the magnitude of the ripple in buck mode. For
most applications a 47μF or greater output capacitor is
recommended.
INPUT CAPACITOR SELECTION
It is recommended that a low ESR ceramic capacitor with
a value of at least 10μF be located as close to the VIN and
GND pins as possible. In addition, the return trace from
each pin to the ground plane should be made as short
as possible. For instances where the input source, such
as a bench supply, is far away from the converter, a bulk
capacitor of 100μF or greater is suggested to provide a
low ripple input voltage especially in buck mode.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC3112EDHD#TRPBF | 12 A SWITCHING REGULATOR, 825 kHz SWITCHING FREQ-MAX, PDSO16 |
| LTC3113EFE#PBF | 16 A SWITCHING REGULATOR, 2000 kHz SWITCHING FREQ-MAX, PDSO20 |
| LTC3113IDHD#TRPBF | 16 A SWITCHING REGULATOR, 2000 kHz SWITCHING FREQ-MAX, PDSO16 |
| LTC3113IFE#PBF | 16 A SWITCHING REGULATOR, 2000 kHz SWITCHING FREQ-MAX, PDSO20 |
| LTC3125EDCB#TRMPBF | SWITCHING REGULATOR, 1900 kHz SWITCHING FREQ-MAX, PDSO8 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3112EFE#PBF | 功能描述:IC REG BUCK BOOST SYNC 20-TSSOP 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:- 設(shè)計資源:Design Support Tool 標準包裝:1 系列:- 類型:升壓（升壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:100mA 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:SOT-23-5 細型，TSOT-23-5 包裝:剪切帶 (CT) 供應(yīng)商設(shè)備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT |
| LTC3112EFE#PBF | 制造商:Linear Technology 功能描述:IC DC-DC CONV 1.5MHz TSSOP20 |
| LTC3112EFE#TRPBF | 功能描述:IC REG BUCK BST SYNC ADJ 20TSSOP 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:- 設(shè)計資源:Design Support Tool 標準包裝:1 系列:- 類型:升壓（升壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:100mA 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:SOT-23-5 細型，TSOT-23-5 包裝:剪切帶 (CT) 供應(yīng)商設(shè)備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT |
| LTC3112EFEPBF | 制造商:Linear Technology 功能描述:15V 2.5A Synch Buck-Boost DC/DC TSSOP20 |
| LTC3112IDHD#PBF | 功能描述:IC REG BUCK BST SYNC ADJ 16-DFN 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:- 設(shè)計資源:Design Support Tool 標準包裝:1 系列:- 類型:升壓（升壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:100mA 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:SOT-23-5 細型，TSOT-23-5 包裝:剪切帶 (CT) 供應(yīng)商設(shè)備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。