参数资料
| 型号： | SC183CULTRT |
| 厂商： | Semtech |
| 文件页数： | 16/20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)
C OUT =
3 ? ? I LOAD
V DROOP ? f OSC
(4)
tor should be placed as closely as possible to the PVIN and
PGND pins of the SC183C.
1 ? V OUT ? ( V IN ( MAX ) ? V OUT ) ?
? ?
2 3 ? ?
The output capacitor RMS current ripple may be calcu-
lated from Equation 5.
I COUT ( RMS ) = ? (5)
L ? f OSC ? V IN ?
Table 3 lists the manufacturers of recommended output
capacitor options.
Manufacturer
Part Nunber
Murata
GRM21BR60J106K
Murata
GRM219R60J106K
Murata
GRM21BR60J226M
Value
(μF)
10±10%
10±10%
22±20%
Type
X5R
X5R
X5R
Rated
Voltage
(VDC)
6.3
6.3
6.3
Value
at
3.3V
(μF)
4.74
4.05
6.57
Dimensions
LxWxH
(mm)
2.0x1.25x1.25
(EIA:0805)
2.0x1.25x0.85
(EIA:0805)
2.0x1.25x1.25
(EIA:0805)
47±20%
X5R
6.3
20.3
C IN Selection
The SC183C 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 4.7μF should be used. It is
important to consider the DC voltage coefficient charac-
teristics when determining the actual required value. It
should be noted that a 10 m F, 6.3V, X5R ceramic capacitor
with 5V DC applied may exhibit a capacitance as low as
4.5 m F. To estimate the required input capacitor, determine
the acceptable input ripple voltage and calculate the
minimum value required for C IN from Equation 6.
Murata 3.2x1.6x1.6
Table 3 – Recommended Capacitors
GRM31CR60J476M (EIA:1206)
? ?
? ? 1 ? OUT ? ?
? ESR ? ? ? f OSC
C IN
=
V OUT
V IN
? ? V
? I OUT
? V ?
? V IN ?
?
?
(6)
The input capacitor RMS ripple current varies with the
input and output voltage. The maximum input capacitor
RMS current is found from Equation 7.
? ? 1 ? OUT
? ?
I CIN ( RMS ) =
V OUT
V IN
? V
? V IN
?
?
(7)
The input voltage ripple and RMS current ripple are at a
maximum when the input voltage is twice the output
voltage or 50% duty cycle.
The input capacitor provides a low impedance loop for
the edges of pulsed current drawn by the PMOS switch.
Low ESR/ESL X5R ceramic capacitors are recommended
for this function. To minimise stray inductance, the capaci-
? 2010 Semtech Corp.
16
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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