参数资料
| 型号： | SC122ULTRT |
| 厂商： | Semtech |
| 文件页数： | 11/13页 |
| 文件大小： | 0K |
| 描述： | IC REG BST SYNC 3.3V 95MA 6MLPD |
| 标准包装： | 1 |
| 类型： | 升压（升压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 3.3V |
| 输入电压： | 0.7 V ~ 1.6 V |
| PWM 型： | 混合物 |
| 频率 - 开关： | 1.2MHz |
| 电流 - 输出： | 95mA |
| 同步整流器： | 是 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-MLPD-UT |
| 包装： | 标准包装 |
| 供应商设备封装： | 6-MLPD-UT（1.5x2.0） |
| 其它名称： | SC122ULTRTDKR |
SC122
Applications Information (continued)
5×f osc . Any inductor with these properties should provide
satisfactory performance.
The following table lists the manufacturers of recom-
mended inductor options.
PCB Layout Considerations
Good layout can enhance the performance of the DC-DC
converter and can avoid EMI problems, ground bounce,
and resistive voltage losses. The recommended layout is
shown in Figure 2.
Manufacturer/
Part #
Value
(μH)
DCR
(mΩ)
Rated
Current
(mA)
Tolerance
(%)
Dimensions
L×W×H
(mm)
The following simple design rules can be implemented to
ensure good layout:
Sumida 5508472xxxx
Murata
LQM31PN4R7M00L
4.7
4.7
3800
300
90
700
2/5/10/20
20
2.2 × 1.4 × 1.6
3.2 × 1.6 × 0.85
?
?
Place the inductor and filter capacitors as close
to the device as possible and use short wide
traces between the power components.
Maximize ground metal on the component side
Capacitor Selection
Low ESR capacitors such as X5R or X7R type ceramic
capacitors are recommended for input bypassing and
output filtering. Low-ESR tantalum capacitors are not rec-
ommended due to possible reduction in capacitance seen
at the switching frequency of the SC122. Ceramic capaci-
tors of type Y5V are not recommended as their tempera-
ture coefficients make them unsuitable for this
?
to improve the return connection and thermal
dissipation. Separation between the LX node
and GND should be maintained to avoid cou-
pling capacitance between the LX node and the
ground plane.
Use a ground plane with several vias connecting
to the component side ground to further reduce
noise interference on sensitive circuit nodes.
application.
6.7mm
The input and output each require a minimum capaci-
tance value of 10μF at the programmed output voltage.
This must be considered when choosing small package
size capacitors as the DC bias must be included in their
derating to ensure this required value. For example, a
10μF 0805 capacitor may provide suffi cient capacitance at
C OUT
V OUT
low output voltages but may be too low at higher output
LX
OUT
voltages. Therefore, a higher nominal capacitance value
may be required to provide the minimum of 10μF at these
L X
GND
IN
SC122
GND
EN
5.2mm
higher output voltages. Additional output capacitance
can be used extend the time between bursts, or to improve
load transient response. The following table lists recom-
mended capacitors.
C IN
GND
Manufacturer/
Part Number
Murata
GRM21BR60J226ME39B
Murata
GRM31CR71A226KE15L
Value
(μF)
22
22
Rated Voltage
(VDC)
6.3
10
Type
X5R
X7R
Case
Size
0805
1206
Figure 2 — Recommended Layout
11
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