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參數(shù)資料
| 型號： | LT3513EUHF#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 3.5 A SWITCHING REGULATOR, 2220 kHz SWITCHING FREQ-MAX, PQCC38 |
| 封裝： | 5 X 7 MM, LEAD FREE, PLASTIC, MO-220WHKD, QFN-38 |
| 文件頁數(shù)： | 7/22頁 |
| 文件大?。?/td> | 374K |
| 代理商： | LT3513EUHF#TRPBF |
LT3513
15
3513fc
The low ESR and small size of ceramic capacitors make
them the preferred type for LT3513 applications. However,
not all ceramic capacitors are the same. Many of the higher
valuecapacitorsusepoordielectricswithhightemperature
and voltage coefficients. In particular, Y5V and Z5U types
lose a large fraction of their capacitance with applied volt-
age and at temperature extremes.
Because loop stability and transient response depend on
the value of COUT, this loss may be unacceptable. Use
X7R and X5R types. Electrolytic capacitors are also an
option.TheESRsofmostaluminumelectrolyticcapacitors
are too large to deliver low output ripple. Tantalum and
newer, lower ESR organic electrolytic capacitors intended
for power supply use are suitable, and the manufacturers
will specify the ESR. Chose a capacitor with a low enough
ESR for the required output ripple. Because the volume
of the capacitor determines its ESR, both the size and the
value will be larger than a ceramic capacitor that would
give similar ripple performance. One benefit is that the
larger capacitance may give better transient response
for large changes in load current. Table 2 lists several
capacitor vendors.
Table 2. Low ESR Surface Mount Capacitors
VENDOR
TYPE
SERIES
Taiyo Yuden
Ceramic
X5R, X7R
AVX
Ceramic
Tantalum
X5R, X7R
TPS
Kemet
Tantalum
Ta Organic
Al Organic
T491, T494, T495
T520
A700
Sanyo
Ta or Al Organic
POSCAP
Panasonic
Al Organic
SP CAP
TDK
Ceramic
X5R, X7R
DIODE SELECTION
The catch diode (D1 from Figure 1) conducts current only
during switch-off time. Average forward current in normal
operation can be calculated from:
ID(AVG) =IOUT
VIN – VOUT
VIN
The only reason to consider a diode with a larger current
rating than necessary for nominal operation is for the
worst-case condition of shorted output. The diode current
will then increase to the typical peak switch current. Peak
reverse voltage is equal to the regulator input voltage.
Use a diode with a reverse voltage rating greater than the
input voltage. Table 3 lists several Schottky diodes and
their manufacturers.
Table 3. Schottky Diodes
PART NUMBER
VR (V) IAVE (A) VFAT 1A (mV)
VF at 2A (mV)
On Semiconductor
MBRM120E
20
1
530
MBRM140
40
1
550
MBRS240
40
2
MBRA340
40
3
450
Diodes Inc.
B120
20
1
500
B240
40
2
500
B340A
40
3
450
BOOST PIN CONSIDERATIONS
The minimum operating voltage of an LT3513 applica-
tion is limited by the undervoltage lockout ~4V and by
the maximum duty cycle. The boost circuit also limits
the minimum input voltage for proper start-up. If the
input voltage ramps slowly or the LT3513 turns on when
the output is already in regulation, the boost capacitor
may not be fully charged. Because the boost capacitor
charges with the energy stored in the inductor, the circuit
will rely on some minimum load current to get the boost
circuit running properly. This minimum load will depend
on input and output voltages. The Typical Performance
Characteristics section shows a plot of the minimum load
current to start as a function of input voltage for a 3.3V
operaTion
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| LT3513EUHF#PBF | 3.5 A SWITCHING REGULATOR, 2220 kHz SWITCHING FREQ-MAX, PQCC38 |
| LT3513IUHF#TRPBF | 3.5 A SWITCHING REGULATOR, 2220 kHz SWITCHING FREQ-MAX, PQCC38 |
| LT3573EMSE#TRPBF | 1.85 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| LT3573IMSE#PBF | 1.85 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| LT3513IUHF#PBF | 功能描述:IC REG 5-OUT FOR TFT-LCD 38QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標準包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
| LT3513IUHF#TRPBF | 功能描述:IC REG 5-OUT FOR TFT-LCD 38QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標準包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
| LT3513IUHF-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:2MHz High Current 5-Output Regulator for TFT-LCD Panels |
| LT3513IUHF-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:2MHz High Current 5-Output Regulator for TFT-LCD Panels |
| LT3514EFE#PBF | 制造商:Linear Technology 功能描述:IC REG BUCK ADJ 24-TSSOP 制造商:Linear Technology 功能描述:BUCK 350KHZ-2.2MHZ 3.2-36V 制造商:Linear Technology 功能描述:BUCK, 350KHZ-2.2MHZ, 3.2-36V, TSSOP-24 制造商:Linear Technology 功能描述:DC-DC CONV, BUCK, ADJ, 2.1MHZ, TSSOP-24, Primary Input Voltage:36V, No. of Outputs:3, Output Current:2A, No. of Pins:24, Operating Temperature Min:-40C, Operating Temperature Max:125C, MSL:MSL 1 - Unlimited, Package / Case:24-TSSOP |
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