参数资料
| 型号： | SC283WLTRT |
| 厂商： | Semtech |
| 文件页数： | 15/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 1.8A 18MLPQ |
| 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： | 0.8 V ~ 3.3 V |
| 输入电压： | 2.9 V ~ 5.5 V |
| 频率 - 开关： | 2.5MHz |
| 电流 - 输出： | 1.8A |
| 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： | 18-WFQFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 18-MLPQ-W（2x3） |
| 其它名称： | SC283WLDKR |
SC283
Applications Information (continued)
minimum gap possible to limit the distance that magnetic
fields can radiate from the inductor. However shielded
inductors typically have a higher DCR and are thus less
efficient than a similarly sized non-shielded inductor.
Final inductor selection depends on various design
considerations such as efficiency, EMI, size, and cost.
Table 2 lists the manufacturers of recommended inductor
options. The saturation characteristics and DC current
ratings are also shown.
mined by the capacitance of the ceramic output capacitor.
The ceramic capacitor supplies the load current initially
until the loop responds. Within a few switching cycles the
loop will respond and the inductor current will increase to
match the required load. The output voltage droop during
the period prior to the loop responding can be related to
the choice of output capacitor by the relationship from
Equation 4.
3 ? ? I LOAD
Manufacturer
Part Number
L
(μH)
DCR
Max
(?)
Rated
Current
(A)
L at
Rated
Current
(μH)
Dimen-
sions
LxWxH
(mm)
C OUT = (4)
V DROOP ? f OSC
The output capacitor RMS ripple current may be calculated
TOKO
1071AS-2R2M
2.20±20% 0.060
1.80
1.54
2.8x3.0x1.5
from Equation 5.
? ?
1 ? V OUT ? ( V IN ( MAX ) ? V OUT ) ?
2 3 ? ?
TOKO
1071AS-1R0N
TOKO
1127AS-2R2M
1.00±30% 0.040
2.20±20% 0.048
2.70
2.50
0.70
1.54
2.8x3.0x1.5
3.5x3.7x1.8
I COUT ( RMS ) =
?
L ? f OSC ? V IN ?
(5)
Panasonic
ELLVGG1R0N
1.00±23% 0.062
2.20
0.70
3.2x3.2x1.5
Table 3 lists the manufacturers of recommended output
Table 2 – Recommended Inductors
capacitor options.
C OUT Selection
The internal voltage loop compensation in the SC283
limits the minimum output capacitor value to 22μF if
using a 2.2μH inductor or 44μF if using a 1μH inductor.
This is due to its influence on the the loop crossover
frequency, phase margin, and gain margin. Increasing
the output capacitor above this minimum value will
reduce the crossover frequency and provide greater
phase margin. The total output capacitance should not
exceed 50μF to avoid any start-up problems. For most
typical applications it is recommended to use an output
Manufacturer
Part Nunber
Murata
GRM21BR60J106K
Murata
GRM219R60J106K
Murata
GRM21BR60J226M
Murata
GRM31CR60J476M
Value
(μF)
10±10%
10±10%
22±20%
47±20%
Type
X5R
X5R
X5R
X5R
Rated
Voltage
(VDC)
6.3
6.3
6.3
6.3
Value
at
3.3V
(μF)
4.74
4.05
6.57
20.3
Dimensions
LxWxH
(mm)
2.0x1.25x1.25
(EIA:0805)
2.0x1.25x0.85
(EIA:0805)
2.0x1.25x1.25
(EIA:0805)
3.2x1.6x1.6
(EIA:1206)
capacitance of 22μF to 44μF. When choosing the output
capacitor’s capacitance, verify the voltage derating effect
from the capacitor vendor ’s data sheet.
Capacitors with X7R or X5R ceramic dielectric are
recommended for their low ESR and superior temperature
and voltage characteristics. Y5V capacitors should not
be used as their temperature coefficients make them
unsuitable for this application.
The output voltage droop due to a load transient is deter-
Table 3 – Recommended Capacitors
C IN Selection
The SC283 source input current is a DC supply current
with a triangular ripple imposed on it. To prevent large
input voltage ripple, a low ESR ceramic capacitor is
required. A minimum value of 10μF should be used. It is
important to consider the DC voltage coefficient charac-
teristics when determining the actual required value. It
should be noted a 10μF, 6.3V, X5R ceramic capacitor with
5V DC applied may exhibit a capacitance as low as 4.5μF.
? 2010 Semtech Corp.
15
www.semtech.com
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