参数资料
| 型号： | SC194AMLTRT |
| 厂商： | Semtech |
| 文件页数： | 9/17页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 1A 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： | 1A |
| 同步整流器： | 无 |
| 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： | SC194AMLDKR |
SC194A
POWER MANAGEMENT
Applications Information (Cont.)
The SC194A is designed for use with a 4.7 μ H inductor.
The magnitude of the inductor current ripple is dependent
on the inductor value and can be determined by the
following equation:
PRELIMINARY
Output voltage ripple is a combination of the voltage
ripple from the inductor current charging and discharging
the output capacitor and the voltage created from the
inductor current ripple through the output capacitor ESR.
Selecting an output capacitor with a low ESR will reduce
( )
V OUT
Δ I L = ———
L × f OSC
V OUT
1 - ———
V IN
the output voltage ripple component, as can be seen in
the following equation:
Δ V OUT(ESR) = Δ I L(ripple) × ESR COUT
This equation demonstrates the relationship between
I L(PK) = I OUT(MAX) + ——
inputvoltage,outputvoltage,andinductorripplecurrent.
The inductor should have a low DCR to minimize the
conduction losses and maximize ef ? ciency. As a minimum
requirement, the DC current rating of the inductor
should be equal to the maximum load current plus half
of the inductor current ripple as shown by the following
equation:
Δ I L
2
Final inductor selection will depend on various design
considerations such as ef ? ciency, EMI, size and cost.
Capacitors with X7R or X5R ceramic dielectric are
strongly recommended for their low ESR and superior
temperature and voltage characteristics. Y5V capacitors
should not be used as their temperature coef ? cients
make them unsuitable for this application. Table 2 lists
the manufacturers of recommended capacitor options.
Table 1: Recommended Inductors
Table 1 lists the manufacturers of practical inductor
options.
C IN Selection
The source input current to a buck converter is non-
continuous. To prevent large input voltage ripple a low
ESR ceramic capacitor is required. A minimum value of
10 μ F should be used for suf ? cient input voltage ? ltering
Manufacturer/Part #
BI Technologies
HM66304R7
Coilcraft
D01608C-472ML
TDK
VLCF4018T- 4R7N1R0-2
Value
μ H
4.7
4.7
4.7
DCR
Ω
0.072
0.09
0.101
Saturation
Current
A
1.32
1.5
1.07
Tolerance
±%
20
20
30
Dimensions
(LxWxH)
mm
4.7 × 4.7 × 3.0
6.6 × 4.5 × 3.0
4.3 × 4.0 × 1.8
and a 22 μ F should be used for improved input voltage
? ltering.
Value
Temperature
μ F
Characteristic
C OUT Selection
The internal compensation is designed to work with a
certain output ? lter corner frequency de ? ned by the
Table 2: Recommended Capacitors
Rated
Manufacturer/Part # Voltage
VDC
Case Size
equation:
f c =
1
2 π √ L × C OUT
Murata
GRM21BR60J226ME39L
Murata
22
6.3
X5R
0805
GRM188R60J106
10
6.3
X5R
0603
MKE19
This single pole ? lter is designed to operate with a
minimum output capacitor value of 10 μ F. Larger output
TDK
C2012X5R0J106K
10
6.3
X5R
0603
capacitor values will improve transient performance. If
PSAVE operation is required the minimum capacitor value
is 22 μ F.
Note: Where PSAVE operation is required 22 μ F must be used for C OUT .
? 2006 Semtech Corp.
9
www.semtech.com
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相关代理商/技术参数 |
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| SC194B | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Selectable 3.6V/3.3V/3.0V/2.5V 1A Synchronous Buck Converter |
| SC194BEVB | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Selectable 3.6V/3.3V/3.0V/2.5V 1A Synchronous Buck Converter |
| SC194BMLTRT | 功能描述:IC REG BUCK ADJ 1A 10MLP 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:1,000 系列:- 类型:降压（降压） 输出类型:可调式 输出数:1 输出电压:0.6 V ~ 4.5 V 输入电压:3 V ~ 5.5 V PWM 型:电流模式 频率 - 开关:3MHz 电流 - 输出:1.5A 同步整流器:无 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 供应商设备封装:6-LLP-EP（3x3） 产品目录页面:1300 (CN2011-ZH PDF) 其它名称:LM2831ZSDLM2831ZSDTR |
| SC195 | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:3.5MHz, 500mA Synchronous Step Down DC-DC Regulator |
| SC195_10 | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:3.5MHz, 500mA Synchronous Step Down DC-DC Regulator |
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