参数资料
| 型号： | SC183CULTRT |
| 厂商： | Semtech |
| 文件页数： | 15/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 2A 16MLPQ |
| 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： | 0.8 V ~ 3.3 V |
| 输入电压： | 2.9 V ~ 5.5 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 2.5MHz |
| 电流 - 输出： | 2A |
| 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： | 16-MLPQ |
| 包装： | 标准包装 |
| 供应商设备封装： | 16-MLPQ-UT（3x3） |
| 产品目录页面： | 1357 (CN2011-ZH PDF) |
| 其它名称： | SC183CULDKR |
SC183C
Applications Information (continued)
The inductor saturation current is specified as the current
at which the inductance drops a specific percentage from
the nominal value. This is approximately 30%. Except for
options. The saturation characteristics and DC current
ratings are also shown.
L
(μH)
short-circuit or other fault conditions, the peak current
must always be less than the saturation current specified
by the manufacturer. The peak current is the maximum
load current plus one half of the inductor ripple current at
the maximum input voltage. Load and/or line transients
can cause the peak current to exceed this level for short
durations. Maintaining the peak current below the induc-
tor saturation specification keeps the inductor ripple
current and the output voltage ripple at acceptable levels.
Manufacturers often provide graphs of actual inductance
and saturation characteristics versus applied inductor
Manufacturer
Part Number
TOKO
1071AS-2R2M
TOKO
1071AS-1R0N
TOKO
1127AS-2R2M
Panasonic
ELLVGG1R0N
DCR
Max
(?)
2.20±20% 0.060
1.00±30% 0.040
2.20±20% 0.048
1.00±23% 0.062
Rated
Current
(A)
1.80
2.70
2.50
2.20
L at
Rated
Current
(μH)
1.54
0.70
1.54
0.70
Dimen-
sions
LxWxH
(mm)
2.8x3.0x1.5
2.8x3.0x1.5
3.5x3.7x1.8
3.2x3.2x1.5
current. The saturation characteristics of the inductor can
vary significantly with core temperature. Core and ambient
temperatures should be considered when examining the
core saturation characteristics.
When the inductance has been determined, the DC resis-
tance (DCR) must be examined. The efficiency that can be
achieved is dependent upon the DCR of the inductor.
Lower values give higher efficiency. The RMS DC current
rating of the inductor is associated with losses in the
copper windings and the resulting temperature rise of the
inductor. This is usually specified as the current which
produces a 40?C temperature rise. Most copper windings
are rated to accommodate this temperature rise above
maximum ambient.
Magnetic fields associated with the output inductor can
interfere with nearby circuitry. This can be minimized by
the use of low noise shielded inductors which use the
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 similar sized non-shielded inductor.
Final inductor selection depends upon various design
considerations such as efficiency, EMI, size, and cost. Table
2 lists the manufacturers of recommended inductor
Table 2 – Recommended Inductors
C OUT Selection
The internal voltage loop compensation in the SC183C
limits the minimum output capacitor value to 22μF if
using an inductor value of 2.2μH or 44 m F if using an induc-
tor of 1μH. 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 50 m F to avoid any start-up problems. For most
typical applications it is recommended to use an output
capacitance of 22 m F to 44 m F. When choosing the output
capacitor’s capacitance, verify the voltage derating effect
from the capacitor vendors data sheet.
Capacitors with X7R or X5R ceramic dielectric are recom-
mended 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-
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.
? 2010 Semtech Corp.
15
www.semtech.com
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| SC185BULTRT | 功能描述:IC REG BUCK SYNC 1V 4A 16MLPQ RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 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:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
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