参数资料
| 型号： | SC4620MLTRT |
| 厂商： | Semtech |
| 文件页数： | 16/19页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 2.5A 20MLPQ |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.5 V ~ 5.5 V |
| 输入电压： | 2.3 V ~ 5.5 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 200kHz ~ 2MHz |
| 电流 - 输出： | 2.5A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-MLPQ |
| 包装： | 标准包装 |
| 供应商设备封装： | 20-MLPQ（4x4） |
| 其它名称： | SC4620MLDKR |
SC4620
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.
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.
1. Both Power ground (PGND) and signal ground (AGND)
are separated.
2. A ground plane is recommended to minimize noise
and copper losses, and maximize heat dissipation.
3. Start the PCB layout by placing the power components
first. Arrange the power circuit to achieve a clean
power flow route.
4. 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.
5. The input ceramic capacitor (C IN ) should be close to
PV IN pins and PGND pins.
6. Both input ceramic capacitor gnd and output ceramic
capacitor gnd are at same port.
7. A RC snubber circuit between PV IN and PH pins is
helpful for stability operation. Be careful with power
derating of snubber circuit.
8. The V CC bypass capacitor should be placed next to the
V CC and AGND pins.
9. The OCP setting resistor (R ISET ) and filter capacitor
(C ISET ) should be placed next to the ISET and AGND
pins.
10. Feedback divider connects to output connector by
Kelvin connection and far away from the noise sources
such as switching node and switching components.
11. A multilayer chip beads between AGND and PGND
will reduce the ground bounce injected to the “quiet”
circuit. It’s helpful for stability operation.
12. 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
the big vias to the bottom layer during the re-flow
process.
? 2008 Semtech Corp.
16
www.semtech.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SC4624 | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Low Input Voltage, High Efficiency, 4A Integrated FET Synchronous Step down DC/DC Regulator |
| SC4624_08 | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Low Input Voltage, High Efficiency, 4A Integrated FET Synchronous Step down DC/DC Regulator |
| SC4624A | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Low Input Voltage, High Efficiency, 4A Integrated FET Synchronous Step down DC/DC Regulator |
| SC4624AEVB-MLPQ | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Low Input Voltage, High Efficiency, 4A Integrated FET Synchronous Step down DC/DC Regulator |
| SC4624AMLTRT | 功能描述:IC REG BUCK ADJ 4A 20MLPQ RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:50 系列:- 类型:升压（升压） 输出类型:可调式 输出数:1 输出电压:5 V ~ 25 V 输入电压:2.3 V ~ 5.5 V PWM 型:电流模式 频率 - 开关:600kHz，1.2MHz 电流 - 输出:1A 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 包装:管件 供应商设备封装:8-MSOP |
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