参数资料
| 型号： | SC2440TETRT |
| 厂商： | Semtech |
| 文件页数： | 21/26页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 2A DL 16TSSOP |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出数： | 2 |
| 输入电压： | 2.8 V ~ 20 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.4MHz |
| 电流 - 输出： | 2A |
| 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： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 16-TSSOP |
| 产品目录页面： | 1358 (CN2011-ZH PDF) |
| 其它名称： | SC2440TEDKR |
SC2440
POWER MANAGEMENT
dt
Applications Information
Board Layout Considerations
In a step-down switching regulator, the input bypass
capacitor, the main power switch and the freewheeling
di
diode carry switched currents with high (Figure 15).
V IN =12V, V OUT =3.3V at 1.7A,
C 5 =470pF, R 5 =15.4K ? and C 6 =10pF
(a)
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 SC2440,
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 also be placed close to the
V IN =12V, V OUT =5V at 1.7A,
C 7 =220pF, R 8 =24.3K ? and C 9 =10pF
(b)
V OUT =3.3V
V OUT =5V
40 μ s/div
Upper Trace : OUT1 Voltage, AC Coupled, 0.5V/div
Lower Trace : L 1 Inductor Current, 0.5A/div
(c)
40 μ s/div
Upper Trace : OUT2 Voltage, AC Coupled, 0.5V/div
Lower Trace : L 2 Inductor Current, 0.5A/div
(d)
Figure 14. Overall Loop Gain and Phase versus Frequency for (a) Channel 1 and (b) Channel 2 of the Dual
DC-DC Converter in Figure 1. (c) Channel 1 Load Transient Response, I OUT1 is switched between
0.3A and 1.7A. (d) Channel 2 Load Transient Response, I OUT2 is switched between 0.45A and
1.7A.
? 2005 Semtech Corp.
21
www.semtech.com
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相关代理商/技术参数 |
参数描述 |
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| SC2441 | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Very Low Input Voltage 2-Phase Synchronous Step-down Controllers with Step-up Converter |
| SC2441A | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:1.8V to 20V Input 2-Phase Synchronous Step-down Controllers with Step-up Converter |
| SC2441A_09 | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:1.8V to 20V Input 2-Phase Synchronous Step-down Controllers with Step-up Converter |
| SC2441AEVB | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:1.8V to 20V Input 2-Phase Synchronous Step-down Controllers with Step-up Converter |
| SC2441ATETRT | 制造商:Semtech Corporation 功能描述: |
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