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參數(shù)資料
| 型號： | LT3686IDD#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2.65 A SWITCHING REGULATOR, 2500 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?。?/td> | 509K |
| 代理商： | LT3686IDD#TRPBF |
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LT3686
12
3686fc
The part is robust enough to survive prolonged opera-
tion under these conditions as long as the peak inductor
current does not exceed 2A. Inductor current saturation
and junction temperature may further limit performance
during this operating regime.
Frequency Selection
The maximum frequency that the LT3686 can be pro-
grammed to is 2.5MHz. The minimum frequency that the
LT3686 can be programmed to is 300kHz. The switching
frequency is programmed by tying a 1% resistor from the
RT pin to ground. Table 1 can be used to select the value
of RT. Minimum on-time and edge loss must be taken into
consideration when selecting the intended frequency of
operation. Higher switching frequency increases power
dissipationandlowersefficiency.Finitetransistorbandwidth
limits the speed at which the power switch can be turned
on and off, effectively setting the minimum on-time of the
LT3686. For a given output voltage, the minimum on-time
determines the maximum input voltage to remain in con-
tinuous mode operation outlined in the Minimum On Time
section of the data sheet. Finite transition time results in
a small amount of power dissipation each time the power
switch turns on and off (edge loss). Edge loss increases
with frequency, switch current, and input voltage.
ApplicAtions inForMAtion
inductor current is therefore peak current plus minimum
switch delay:
1.7A + (VIN – VOUT)/L100ns
Figure 5. Pulse Skip with Large Load Current Will Be Limited by
the DA Valley Current Limit. Notice the Flat Inductor Valley
Current and Reduced Switching Frequency
VIN = 35V
VOUT = 3.3V
L = 6.8H
COUT = 22F
IOUT = 1.2A
VSW
10V/DIV
IL
500mA/DIV
VOUT
100mA/DIV
AC
2s/DIV
3686 F05
Table 1. RT vs Frequency
FREQUENCY (MHz)
RT (kΩ)
2.5
9.53
2.3
12.1
2.1
15.4
1.9
20
1.7
25.5
1.5
31.6
1.3
40.2
1.1
52.3
0.9
69.8
0.7
97.6
0.5
150
0.3
280
FREQUENCY (MHz)
50
100
R
T(k)
200
250
300
150
0
0.5
1
1.5
2
2.5
3686 F06a
0
FREQUENCY (MHz)
5
10
INDUCT
ANCE
(H)
20
25
40
30
35
15
0.25
0.75
5VOUT
1.25
1.75
2.25
3686 F06b
0
12VOUT
3.3VOUT
Figure 6a. Switching Frequency vs RT
Figure 6b. Suggested Inductance vs Frequency
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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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| LT3688EFE#PBF | 功能描述:IC REG BUCK ADJ 0.8A DL 24TSSOP 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:- 產(chǎn)品培訓(xùn)模塊:MIC23xxx HyperLight Load™ Regulators 標(biāo)準(zhǔn)包裝:5,000 系列:HyperLight Load® 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.8V 輸入電壓:2.7 V ~ 5.5 V PWM 型:混合物 頻率 - 開關(guān):4MHz 電流 - 輸出:2A 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:8-VFDFN 裸露焊盤，8-MLF? 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-MLF?（2x2） 產(chǎn)品目錄頁面:1094 (CN2011-ZH PDF) 其它名稱:576-3303-2 |
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