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參數(shù)資料
| 型號： | LT3640EFE#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 3.4 A DUAL SWITCHING CONTROLLER, 2350 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封裝： | 4.40 MM, LEAD FREE, PLASTIC, TSSOP-28 |
| 文件頁數(shù)： | 13/24頁 |
| 文件大?。?/td> | 506K |
| 代理商： | LT3640EFE#TRPBF |
LT3640
0
3640f
3640 F10
L2
L1
CIN2
CIN
CBST
COUT1
COUT2
Figure 9a shows the power-on reset timing. Having FB1
or FB2 high starts the CPOR oscillator. After tRST, the cor-
responding RST is released. When both RST1 and RST2
are released, the CWDT oscillator starts. Figure 9b shows
thewatchdogwaveformwiththeWDIperiodbetweentWDL
and tWDU.TheWDIfallingedgeresetstheCWDToscillator.
The CPOR oscillator is disabled and WDO remains high.
Figure 9c shows the watchdog waveform with the WDI
period longer than tWDU. WDO is asserted for a period of
tRST when the watchdog upper boundary, tWDU, expires.
PCB Layout
For proper operation and minimum EMI, care must be
taken during the printed circuit board (PCB) layout. Figure
10 shows the recommended component placement with
trace, ground plane and via locations. The input loop of
the high voltage channel, which is formed by the VIN
and SW1 pins, the external catch diode (D1), the input
capacitor (CIN) and the ground, should be as small as
possible. These external components should be placed
on the same side of the circuit board as the LT3640, and
their connections should be made on that layer. Place a
local, unbroken ground plane below these components.
The BST and SW nodes should be as small as possible.
The boost capacitor (CBST) should be as close to the BST
and SW pins as possible.
The input loop of the low voltage channel is formed by
the VIN2 pin, the input capacitor (CIN2) and the ground.
Place CIN2 close to the VIN2 and the GND pin to minimize
this loop. Place a local, unbroken ground plane below
this input loop.
Keep the FB1 and FB2 nodes small so that the ground
traces will shield them from the switching nodes. The
Exposed Pad on the bottom of the package must be sol-
dered to the ground so that the pad acts as a heat sink. To
keep thermal resistance low, extend the ground plane as
much as possible, and add thermal vias under and near
the LT3640 to additional ground planes within the circuit
board and on the bottom side.
Figure 10. Recommended PCB Layout, FE28 Package
applicaTions inForMaTion
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PDF描述 |
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| LT3640IFE#TRPBF | 3.4 A DUAL SWITCHING CONTROLLER, 2350 kHz SWITCHING FREQ-MAX, PDSO28 |
| LT3640IUFD#PBF | 3.4 A DUAL SWITCHING CONTROLLER, 2350 kHz SWITCHING FREQ-MAX, PQCC28 |
| LT3640EUFD#TRPBF | 3.4 A DUAL SWITCHING CONTROLLER, 2350 kHz SWITCHING FREQ-MAX, PQCC28 |
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| LT3645IUD#TRPBF | 1.25 A SWITCHING REGULATOR, 825 kHz SWITCHING FREQ-MAX, PQCC16 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT3640EUFD | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual Monolithic Buck Regulator with Power-On Reset and Watchdog Timer |
| LT3640EUFD#PBF | 功能描述:IC REG BUCK FIX/ADJ DL 28QFN 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:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:50mA 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:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤 |
| LT3640EUFD#TRPBF | 功能描述:IC REG BUCK FIX/ADJ DL 28QFN 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 |
| LT3640EUFDPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual Monolithic Buck Regulator with Power-On Reset and Watchdog Timer |
| LT3640EUFDTRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual Monolithic Buck Regulator with Power-On Reset and Watchdog Timer |
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