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參數(shù)資料
| 型號： | SC4624EVB-SO |
| 廠商： | Semtech Corporation |
| 英文描述： | Low Input Voltage, High Efficiency, 4A Integrated FET Synchronous Step down DC/DC Regulator |
| 中文描述： | 低輸入電壓，高效率及4A集成FET的同步降壓直流/直流穩(wěn)壓器 |
| 文件頁數(shù)： | 16/20頁 |
| 文件大?。?/td> | 738K |
| 代理商： | SC4624EVB-SO |
16
2007 Semtech Corp.
www.semtech.com
POWER MANAGEMENT
Operation
Application Information (Cont.)
Layout Guidelines
In order to achieve optimal thermal and noise immunity
for high frequency converters, special attention must be
paid to the PCB layout. The goal of layout optimization
is to minimize the high di/dt loops and reduce ground
bounce.
SC4624
Output voltage setting, line regulation, stability , switching
frequency and OCP trip point shifted are affected by a
poor layout. The following guidelines should be used to
ensure proper functions of the converters.
Both Power ground (PGND) and signal ground (AGND)
are separated.
A ground plane is recommended to minimize noise
and copper losses, and maximize heat dissipation.
Start the PCB layout by placing the power components
first. Arrange the power circuit to achieve a clean
power flow route.
Minimize all high di/dt loops. These loops pass high
di/dt current. Make sure the trace width is wide
enough to reduce copper losses in this loop. Ground
bounce happen to magnetic flux changed and it is
proportional to a magnetic filed which goes through
high di/dt loops.
The input ceramic capacitor (C
IN
) should be close to
PV
pins and PGND pins.
Both input ceramic capacitor gnd and output ceramic
capacitor gnd are at same port.
A RC snubber circuit between PV
and PH pins is
helpful for stability operation. Be careful with power
derating of snubber circuit.
The V
bypass capacitor should be placed next to the
V
and AGND pins.
The OCP setting resistor (R
) and filter capacitor
(C
) should be placed next to the ISET and AGND
pins.
Feedback divider connects to output connector by
Kelvin connection and far away from the noise sources
such as switching node and switching components.
A multilayer chip beads between AGND and PGND
will reduce the ground bounce injected to the “quiet”
circuit. It’s helpful for stability operation.
A large copper area underneath the SC4624 IC is
necessary for heat sinking purpose. And multiple
layers of large copper area connected through vias
can be used for better thermal performance. The size
of the vias as the connection between multiple layers
should not be too large or solder may seep through
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
the big vias to the bottom layer during the re-flow process
.
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相關代理商/技術參數(shù) |
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| SC4624MLTRT | 制造商:Semtech Corporation 功能描述: 制造商:Semtech Corporation 功能描述:SC4624 Series 2 MHz 4 A SMT Synchronous Step Down Regulator - MLPQ-20 |
| SC4624SETRT | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Low Input Voltage, High Efficiency, 4A Integrated FET Synchronous Step down DC/DC Regulator |
| SC4626 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:2.5MHz, 1A Synchronous Step Down Regulator in SOT23-5 |
| SC4626ASKTRT | 功能描述:IC REG BUCK SYNC 1V 1A SOT23-5 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(shù):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(chǎn)品目錄頁面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
| SC4626FSKTRT | 功能描述:IC REG BUCK SYNC 1.3V 1A SOT23-5 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(shù):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(chǎn)品目錄頁面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
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