参数资料
| 型号： | SC198AMLTRT |
| 厂商： | Semtech |
| 文件页数： | 12/15页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC PROG .8A 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： | 800mA |
| 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） |
| 其它名称： | SC198AMLDKR |
NOT RECOMMENDED FOR NEW DESIGN
Applications Information (continued)
SC198A
Inductor Selection
The SC198A was designed for optimum performance
when using a 4.7μH inductor. The magnitude of the
inductor current ripple is dependent on the inductor value
and is determined by the equation
Output Capacitor
Output voltage ripple is dominated by the filter capaci-
tance ESR as shown in the equation
V OUT(P-P) = DI L × ESR COUT
I L
V OUT
L f osc
1
V OUT
V IN
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
This equation demonstrates the relationship between
input voltage, output voltage, and inductor ripple current.
The inductor should also have a low DCR to minimize the
conduction losses and maximize effi 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 equation
used as their temperature coeffi cients make them unsuit-
able for this application.
When selecting capacitors for the application, first con-
sider the DC voltage characteristic of the capacitor. The
capacitance value at the DC operating voltage may be
considerably lower than the rated value. Table 3 lists rec-
ommended capacitor values which have been chosen to
I L(Peak)
I OUT(MAX)
I L
2
minimize the impact of this limitation. A 10μF ceramic
capacitor is the minimum recommended value for the
output filter capacitor. It is important to ensure the capaci-
tor value does not drop below 9μF for the operating range
Final inductor selection will depend on various design
considerations such as effi ciency, EMI, size, and cost. Table
2 lists some manufacturers of practical inductor options.
of the application.
Table 3 — Recommended Capacitors
Manufacturer/
Part No.
Table 2 — Recommended Inductors
Rate Tolerance Dimensions
Value DCR
Current (+%) LxWxH
(μH) (Ω)
(A) (mm)
Manufacturer/
Part No.
Murata
GRM21BR60J226ME39
Value
(μF)
22
Rated
Voltage
(VDC)
6.3
Type
X5R
Case
Size
0805
Coilcraft
LPO6610-472ML
Coilcraft
1812PS-472KLB
4.7
4.7
0.20
0.11
1.1
2.10
±20
±20
6.60 × 5.50 × 1.10
5.87 × 4.89 × 3.81
Murata
GRM188R60J106ME47
Murata
GRM21BR60J106KE01B
10
10
6.3
6.3
X5R
X5R
0603
0805
Coilcraft
D01608C-472ML
4.7
0.09
1.5
±20
6.60 × 4.50 × 13.0
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 4.7μF
should be used for suffi cient input voltage filtering and a
22 μF MLCC may be used for optimum input voltage
filtering.
12
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