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參數(shù)資料
| 型號(hào)： | SC470IMLTRT |
| 廠商： | Semtech Corporation |
| 英文描述： | Synchronous Buck Controller for Dynamic Load-Voltage Applications |
| 中文描述： | 同步降壓控制器的動(dòng)態(tài)負(fù)載電壓應(yīng)用 |
| 文件頁數(shù)： | 20/31頁 |
| 文件大?。?/td> | 574K |
| 代理商： | SC470IMLTRT |
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20
2005 Semtech Corp.
www.semtech.com
SC470
POWER MANAGEMENT
Application Information (Cont.)
Figure 13: Power Component Placement and Copper Pours
Key points for the power section:
1) There should be a very small input loop, well decoupled.
2) The phase node should be a large copper pour, but compact since this is the noisiest node.
3) Input power ground and output power ground should not connect directly, but through the ground planes instead.
4) Notice in Figure 10 on page 18, the placement of 0
resistor at the bottom of the output capacitor to connect
to VSSA.
5) The current limit resistor should be placed as close as possible to the ILIM and LX pins.
Connecting the control and power sections should be accomplished as follows (see Figure 14 on Page 21):
1) Route VSSA and VOUT as differential pairs routed in a “quiet” layer away from noise sources.
2) Route DL, DH and LX (low-side FET gate drive, high side FET gate drive and phase node) to chip using wide traces
with multiple vias if using more than one layer. These connections to be as short as possible for loop minimization,
with a length to width ratio less than 20:1 to minimize impedance. DL is the most critical gate drive, with power
ground as its return path. LX is the noisiest node in the circuit, switching between V
BAT
and ground at high frequencies,
thus should be kept as short as practical. DH has LX as its return path.
3) BST is also a noisy node and should be kept as short as possible.
4) Connect PGND pin on the chip directly to the VDDP decoupling capacitor and then drop vias directly to the ground
plane.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SC470ITSTRT | Synchronous Buck Controller for Dynamic Load-Voltage Applications |
| SC471EVB | Synchronous Buck Controller with Multi-Level VOUT Transition Support |
| SC471MLTRT | Synchronous Buck Controller with Multi-Level VOUT Transition Support |
| SC471 | Synchronous Buck Controller with Multi-Level VOUT Transition Support |
| SC471A | Synchronous Buck Controller with Multi-Level VOUT Transition Support |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SC470ITSTRT | 功能描述:IC REG CTRLR BUCK PWM 14-TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 特色產(chǎn)品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 標(biāo)準(zhǔn)包裝:1 系列:PowerWise® PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:81% 電源電壓:4.5 V ~ 18 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-5°C ~ 125°C 封裝/外殼:32-WFQFN 裸露焊盤 包裝:Digi-Reel® 產(chǎn)品目錄頁面:1303 (CN2011-ZH PDF) 其它名稱:LM3754SQDKR |
| SC471 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Synchronous Buck Controller with Multi-Level VOUT Transition Support |
| SC471_08 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Synchronous Buck Controller with Multi-Level VOUT Transition Support |
| SC471A | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Synchronous Buck Controller with Multi-Level VOUT Transition Support |
| SC471AEVB | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Synchronous Buck Controller with Multi-Level VOUT Transition Support |
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