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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)： | 3/28頁 |
| 文件大小： | 509K |
| 代理商： | LT3686IDD#TRPBF |
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LT3686
11
3686fc
ApplicAtions inForMAtion
Figure 3. Continuous Mode Operation Near Minimum On Time
When the required on time decreases below the typical
minimum on time of 100ns, instead of the switch pulse
width becoming narrower to accommodate the lower duty
cycle requirement, the switch pulse width remains fixed at
100ns. The inductor current ramps up to a value exceed-
ing the load current and the output ripple increases. The
part then remains off until the output voltage dips below
the programmed value before it begins switching again
(Figure 4).
Provided that the load can tolerate the increased output
voltagerippleandthatthecomponentshavebeenproperly
selected, operation while pulse skipping is safe and will
not damage the part. As the input voltage increases, the
inductor current ramps up quicker, the number of skipped
pulses increases, and the output voltage ripple increases.
Inductor current may reach current limit when operating
in pulse skip mode with small valued inductors. In this
case, the LT3686 will periodically reduce its frequency to
keep the inductor valley current to 1.7A (Figure 5). Peak
Figure 4. Pulse Skip Occurs When Required On Time Is
Below 100ns
The maximum input voltage is determined by the absolute
maximum ratings of the VIN and BOOST pins. For fixed
frequency operation, the maximum input voltage is de-
termined by the minimum duty cycle DCMIN:
VIN(MAX) =
VOUT + VD
DCMIN
– VD + VSW
DCMIN can be adjusted with frequency. Note that this is a
restrictionontheoperatinginputvoltageforfixedfrequency
operation; the circuit will tolerate transient inputs up to
the absolute maximum ratings of the VIN and BOOST pins.
Minimum On Time
As the input voltage is increased, the LT3686 is required
to switch for shorter periods of time. Delays associated
with turning off the power switch dictate the minimum on
time of the part. The minimum on time for the LT3686 is
100ns (Figure 3).
VIN = 18V
VOUT = 3.3V
L = 6.8H
COUT = 22F
ILOAD = 1.2mA
VOUT
100mV/DIV
AC
VSW
10V/DIV
IL
500mA/DIV
500ns/DIV
3686 F03
VIN = 35V
VOUT = 3.3V
L = 6.8H
COUT = 22F
IOUT = 300mA
VSW
20V/DIV
IL
500mA/DIV
VOUT
100mA/DIV
AC
2s/DIV
3686 F04
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT3688 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual 800mA Step-Down Switching Regulator with Power-On Reset |
| 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 |
| LT3688EFE#TRPBF | 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:- 設(shè)計資源: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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