参数资料
型号: SC190BIMLTRT
厂商: Semtech
文件页数: 11/18页
文件大小: 0K
描述: IC REG BUCK SYNC ADJ 0.3A 10MLP
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: 可调
输入电压: 2.7 V ~ 5.5 V
PWM 型: 电流模式
频率 - 开关: 1MHz
电流 - 输出: 300mA
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: 10-VFDFN 裸露焊盘
包装: 标准包装
供应商设备封装: 10-MLP(3x3)
产品目录页面: 1357 (CN2011-ZH PDF)
其它名称: SC190BIMLDKR
SC190
POWER MANAGEMENT
Applications Information (Cont.)
CIN Selection
The source input current to the SC190 buck converter is
a DC supply current with a triangular ripple riding on it.
To prevent large input voltage ripple a low ESR ceramic
capacitor is required. A minimum value of 4.7μF should
be used for suf?cient input voltage ?ltering and a 10μF
MLCC should be used for optimum input voltage ?ltering.
Input voltage ripple of approximately 1mV can be achieved
when C IN = 10μF, and the front-end LDO regulator is active
and pre-regulating the input supply to the switching
regulator. (See page 12: Input Voltage Ripple graphs).
COUT Selection
A 10μF ceramic capacitor is recommended for the output
?lter capacitor. Output voltage ripple is dominated by the
?lter capacitance as shown in the following equation:
Vout _ ripple = ? IL ( ripple ) ? Cout ( ESR )
Choose an X7R or X5R ceramic dielectric for low ESR and
superior temperature and voltage characteristics. Do not
use Y5V capacitors - their temperature coef?cients make
them impractical for this application.
Table 3: Recommended Capacitors
Manufacturer
Murata
Murata
TDK
Part Number
GRM188R60J475KE19D
GRM188R60G106ME47D
C1608X5ROG106M
Value
(μF)
4.7
10
10
Rated Voltage
(VDC)
6.3
4
4
Type
X5R
X5R
X5R
Case Size
0603
0603
0603
? 2005 Semtech Corp.
11
www.semtech.com
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