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參數資料
| 型號： | LT3684IMSE |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 4 A SWITCHING REGULATOR, 3300 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | PLASTIC, MSOP-10 |
| 文件頁數： | 9/24頁 |
| 文件大小： | 326K |
| 代理商： | LT3684IMSE |
LT3684
17
3684f
Hot Plugging Safely
The small size, robustness and low impedance of ceramic
capacitors make them an attractive option for the input
bypass capacitor of LT3684 circuits. However, these capaci-
tors can cause problems if the LT3684 is plugged into a
live supply (see Linear Technology Application Note 88 for
a complete discussion). The low loss ceramic capacitor,
combined with stray inductance in series with the power
source, forms an under damped tank circuit, and the
voltage at the VIN pin of the LT3684 can ring to twice the
nominal input voltage, possibly exceeding the LT3684’s
rating and damaging the part. If the input supply is poorly
controlled or the user will be plugging the LT3684 into an
energized supply, the input network should be designed
to prevent this overshoot. Figure 9 shows the waveforms
that result when an LT3684 circuit is connected to a 24V
supply through six feet of 24-gauge twisted pair. The
rst plot is the response with a 4.7F ceramic capacitor
at the input. The input voltage rings as high as 50V and
the input current peaks at 26A. A good solution is shown
in Figure 9b. A 0.7
Ω resistor is added in series with the
APPLICATIONS INFORMATION
Figure 8. A Good PCB Layout Ensures Proper, Low EMI Operation
VIAS TO LOCAL GROUND PLANE
VIAS TO VOUT
VIAS TO RUN/SS
VIAS TO PG
VIAS TO VIN
OUTLINE OF LOCAL
GROUND PLANE
3684 F08
L1
C2
RRT
RPG
RC
R2
R1
CC
VOUT
D1
C1
GND
input to eliminate the voltage overshoot (it also reduces
the peak input current). A 0.1F capacitor improves high
frequency ltering. For high input voltages its impact on
efciency is minor, reducing efciency by 1.5 percent for
a 5V output at full load operating from 24V.
High Temperature Considerations
The PCB must provide heat sinking to keep the LT3684
cool. The Exposed Pad on the bottom of the package must
be soldered to a ground plane. This ground should be tied
to large copper layers below with thermal vias; these lay-
ers will spread the heat dissipated by the LT3684. Place
additional vias can reduce thermal resistance further. With
these steps, the thermal resistance from die (or junction)
to ambient can be reduced to
θJA = 35°C/W or less. With
100 LFPM airow, this resistance can fall by another 25%.
Further increases in airow will lead to lower thermal re-
sistance. Because of the large output current capability of
the LT3684, it is possible to dissipate enough heat to raise
the junction temperature beyond the absolute maximum of
125°C. When operating at high ambient temperatures, the
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相關代理商/技術參數 |
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| LT3684IMSE#PBF | 功能描述:IC REG BUCK ADJ 2A 10MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 標準包裝:250 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數:1 輸出電壓:1.2V 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開關:2MHz 電流 - 輸出:500mA 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:6-UFDFN 包裝:帶卷 (TR) 供應商設備封裝:6-SON（1.45x1） 產品目錄頁面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
| LT3684IMSE#PBF | 制造商:Linear Technology 功能描述:DC-DC CONVERTER BUCK 2.8MHZ 制造商:Linear Technology 功能描述:DC-DC CONVERTER, BUCK, 2.8MHZ, MSOP-10 |
| LT3684IMSE#TRPBF | 功能描述:IC REG BUCK ADJ 2A 10MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 設計資源: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:1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開關:- 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) 供應商設備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT |
| LT3685 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:36V, 2.6A Monolithic Buck |
| LT3685EDD#PBF | 功能描述:IC REG BUCK ADJ 2A 10DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 標準包裝:250 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數:1 輸出電壓:1.2V 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開關:2MHz 電流 - 輸出:500mA 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:6-UFDFN 包裝:帶卷 (TR) 供應商設備封裝:6-SON（1.45x1） 產品目錄頁面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
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