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參數(shù)資料
| 型號： | LTC3411IMS |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2 A SWITCHING REGULATOR, 4000 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | PLASTIC, MSOP-10 |
| 文件頁數(shù)： | 24/24頁 |
| 文件大?。?/td> | 247K |
| 代理商： | LTC3411IMS |
LTC3411
9
3411fb
APPLICATIONS INFORMATION
A general LTC3411 application circuit is shown in Figure 5.
External component selection is driven by the load require-
ment, and begins with the selection of the inductor L1.
Once L1 is chosen, CIN and COUT can be selected.
Operating Frequency
Selection of the operating frequency is a tradeoff between
efciency and component size. High frequency operation
allows the use of smaller inductor and capacitor values.
Operation at lower frequencies improves efciency by
reducing internal gate charge losses but requires larger
inductance values and/or capacitance to maintain low
output ripple voltage.
The operating frequency, fO, of the LTC3411 is determined
by an external resistor that is connected between the RT
pin and ground. The value of the resistor sets the ramp
current that is used to charge and discharge an internal
timing capacitor within the oscillator and can be calculated
by using the following equation:
Rf
TO
=
()
Ω
()
978 1011
108
.
or can be selected using Figure 2.
The maximum usable operating frequency is limited by
the minimum on-time and the duty cycle. This can be
calculated as:
fO(MAX) ≈ 6.67 (VOUT / VIN(MAX)) (MHz)
The minimum frequency is limited by leakage and noise
coupling due to the large resistance of RT.
Inductor Selection
Although the inductor does not inuence the operat-
ing frequency, the inductor value has a direct effect on
ripple current. The inductor ripple current
ΔIL decreases
with higher inductance and increases with higher VIN or
VOUT:
Δ=
I
V
fL
V
L
OUT
O
OUT
IN
1
Accepting larger values of
ΔIL allows the use of low induc-
tances, but results in higher output voltage ripple, greater
core losses, and lower output current capability.
A reasonable starting point for setting ripple current is 40%
of maximum output current, or
ΔIL = 0.4 1.25A = 500mA.
The largest ripple current
ΔILoccursatthemaximuminput
voltage. To guarantee that the ripple current stays below a
specied maximum, the inductor value should be chosen
according to the following equation:
L
V
fI
V
OUT
OL
OUT
IN MAX
=
Δ
()
1
The inductor value will also have an effect on Burst Mode
operation. The transition from low current operation
begins when the peak inductor current falls below a level
set by the burst clamp. Lower inductor values result in
RT (kΩ)
0
FREQUENCY
(MHz)
0.5
1.5
2.0
2.5
1000
4.5
TA = 25°C
3411 F02
1.0
500
1500
3.0
3.5
4.0
Figure 2. Frequency vs RT
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| LTC3411IMS#PBF | 功能描述:IC REG BUCK SYNC ADJ 10MSOP 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(jì)資源:Design Support Tool 標(biāo)準(zhǔn)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(xì)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 |
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| LTC3412 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:8A, 4MHz, Monolithic Synchronous Step-Down Regulator |
| LTC3412A | 制造商:LINER 制造商全稱:Linear Technology 功能描述:3A, 4MHz, Monolithic Synchronous Step-Down Regulator |
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