参数资料
| 型号： | SC194BMLTRT |
| 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： | SC194BMLDKR |
SC194B
POWER MANAGEMENT
Applications Information (Cont.)
Final inductor selection will depend on various design
considerations such as ef ? ciency, EMI, size and cost.
Table 1 lists the manufacturers of practical inductor
options.
Table 1 — Recommended Inductors
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.
Manufacturer/Part No.
Value
( μ H)
DCR
( Ω )
Saturation
Current
(A)
Tolerance
(+%)
Dimensions
LxWxH
(mm)
Table 2 — Recommended Capacitors
BI Technologies
HM66304R7
Coilcraft
D01608C-472ML
TDK
VLCF4018T- 4R7N1R0-2
4.7
4.7
4.7
0.072
0.09
0.101
1.32
1.5
1.07
20
20
30
4.7 × 4.7 ×3.0
6.6 × 4.5 ×3.0
4.3 × 4.0 ×1.8
Manufacturer/Part No.
Murata
GRM21BR60J226ME39L
Murata
GRM188R60J106MKE19
Value
( μ F)
22
10
Rated
Voltage
(VDC)
6.3
6.3
Temperature
Characteristic
X5R
X5R
Case Size
0805
0603
10
6.3
X5R
0603
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
and a 22 μ F should be used for improved input voltage
? ltering.
C OUT Selection
The internal compensation is designed to work with a
certain output ? lter corner frequency de ? ned by the
equation:
TDK
C2012X5R0J106K
Note: Where PSAVE operation is required 22 μ F must be used for C OUT .
f C
2
1
L C OUT
This single pole ? lter is designed to operate with a
minimum output capacitor value of 10 μ F. Larger output
capacitor values will improve transient performance.
If PSAVE operation is required the minimum capacitor
value is 22 μ F.
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
the output voltage ripple component, as can be seen in
the following equation:
V OUT(ESR)
I L(ripple) ESR COUT
? 2006 Semtech Corp.
9
www.semtech.com
相关PDF资料 |
PDF描述 |
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| SC195ULTRT | IC REG BUCK SYNC ADJ 0.5A 8MLPQ |
| SC196AMLTRT | IC REG BUCK SYNC 1.5A 10MLP |
| SC196ULTRT | IC REG BUCK SYNC ADJ 1.5A 10MLPD |
| SC198AMLTRT | IC REG BUCK SYNC PROG .8A 20MLPQ |
| SC198MLTRT | IC REG BUCK SYNC PROG .6A 20MLPQ |
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| SC195UL.TRT | 制造商:SEMTECH 功能描述:I.C. |
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