参数资料
型号: SC4524SETRT
厂商: Semtech
文件页数: 19/21页
文件大小: 0K
描述: IC REG BUCK 2A 8SOIC
标准包装: 1
类型: 降压(降压)
输出数: 1
输入电压: 2.8 V ~ 30 V
PWM 型: 电流模式
频率 - 开关: 1.4MHz
电流 - 输出: 2A
同步整流器:
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 8-SOIC(0.154",3.90mm 宽)
包装: 标准包装
供应商设备封装: 8-SOIC-EP
产品目录页面: 1358 (CN2011-ZH PDF)
其它名称: SC4524SEDKR
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SC4524
POWER MANAGEMENT
Applications Information
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Bench measurement shows that compensation
components computed from our simplified linear model
diode carry discontinuous currents with high (Figure
give very good load transient response for the converter.
Board Layout Considerations
In a step-down switching regulator, the input bypass
capacitor, the main power switch and the freewheeling
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12). For jitter-free operation, the size of the loop formed
by these components should be minimized. Since the
power switches are already integrated within the SC4524,
connecting the anodes of both freewheeling diodes close
to the negative terminal of the input bypass capacitor
minimizes size of the switched current loop. The input
bypass capacitors should be placed close to the VIN pin.
Shortening the traces of the SW and BST nodes reduces
the parasitic trace inductance at these nodes. This not
only reduces EMI but also decreases switching voltage
spikes at these nodes.
The exposed pad should be soldered to a large analog
ground plane as the analog ground copper acts as a heat
sink for the device. To ensure proper adhesion to the
ground plane, avoid using vias directly under the device.
Figure 12. Fast Switching Current Paths in a Buck
Regulator. Minimize the size of this loop
to reduce parasitic trace inductance.
? 2006 Semtech Corp.
19
www.semtech.com
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