参数资料
| 型号： | SC198MLTRT |
| 厂商： | Semtech |
| 文件页数： | 9/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC PROG .6A 20MLPQ |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 可编程 |
| 输入电压： | 2.7 V ~ 5.5 V |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 600mA |
| 同步整流器： | 是 |
| 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） |
| 产品目录页面： | 1358 (CN2011-ZH PDF) |
| 其它名称： | SC198MLDKR |
NOT RECOMMENDED FOR NEW DESIGN
POWER MANAGEMENT
Applications Information (Cont.)
SC198
Inductor Selection
The SC198 was designed for optimum performance when
using a 4.7 μ H inductor. The magnitude of the inductor
current ripple is dependent on the inductor value and can
be determined by the following equation:
Capacitors with X7R or X5R ceramic dielectric are strongly
recommended for their low ESR and superior temperature
and voltage characteristics. Y5V capacitors should not be
used as their temperature coef ? cients make them unsuit-
able for this application. Table C lists some manufactur-
ers of recommended capacitor options.
(
)
V OUT
Δ I L = ———
L × f OSC
V OUT
1 + ———
V IN
I L(PK) = I OUT(MAX) + ——
This equation demonstrates the relationship between in-
put voltage, output voltage, and inductor ripple current.
The inductor should also have a low DCR to minimize the
conduction losses and maximize ef ? ciency. The minimum
DC current rating of the inductor should be equal to the
maximum load current plus half of the inductor current
ripple as shown by the following equation:
Δ I L
2
Final inductor selection will depend on various design con-
siderations such as ef ? ciency, EMI, size and cost. Table B
lists some manufacturers of practical inductor options.
Capacitor Selection
Input Capacitor
The source input current to a buck converter is non-con-
tinuous. To prevent large input voltage ripple a low ESR
ceramic capacitor is required. A minimum value of 4.7 μ F
should be used for suf ? cient input voltage ? ltering and a
22 μ F MLCC may be used for optimum input voltage ? lter-
ing.
Output Capacitor
A 4.7 μ F ceramic capacitor is the minimum recommended
for the output ? lter capacitor. A capacitor value of at least
10 μ F is recommended if the part will be used in power-
save mode. Output voltage ripple is dominated by the ? l-
ter capacitance ESR as shown in the following equation:
V OUT(P-P) = Δ I L × ESR COUT
? 2007 Semtech Corp.
9
www.semtech.com
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