- 您现在的位置：买卖IC网 > PDF目录80283 > LTC1551LCMS8#TR-4.1 (LINEAR TECHNOLOGY CORP) SWITCHED CAPACITOR REGULATOR, 900 kHz SWITCHING FREQ-MAX, PDSO8 PDF资料下载
参数资料
| 型号： | LTC1551LCMS8#TR-4.1 |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHED CAPACITOR REGULATOR, 900 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | PLASTIC, MSOP-8 |
| 文件页数： | 12/12页 |
| 文件大小： | 271K |
| 代理商： | LTC1551LCMS8#TR-4.1 |
9
LTC1550L/LTC1551L
APPLICATIONS INFORMATION
WU
U
Figure 4 shows a marked decrease in peak-to-peak output
ripple when a 0.1
F ceramic capacitor is added in parallel
with the tantalum output capacitor. The additional ripple
with the tantalum output capacitor alone is mostly very
high order harmonics of the 900kHz clock, which appear
as sharp "spikes" at the output. The energy in these spikes
is very small and they do not contribute to the RMS output
voltage, but their peak-to-peak amplitude can be several
millivolts under some conditions. A 0.1
F ceramic capaci-
tor has significantly lower impedance at the spike fre-
quency than a large tantalum capacitor, and eliminates
most of these left-over switching spikes that the tantalum
capacitor leaves behind. Figure 5 and 6 show scope photos
of the output of Figure 4 with and without the additional
ceramic capacitor at the output.
A series RC or LC filter can reduce high frequency output
noise even further. Due to the high 900kHz switching
frequency, not much R or L is required; a ferrite bead or a
relatively long PC board trace in series with 0.1
F ceramic
capacitor will usually keep the output ripple well below
1mVP-P. Figure 1 shows an example of an ultralow noise
– 2V generator. The corresponding spectrum and spot
noise plots for this circuit are shown in the Typical Perfor-
mance Characteristics section.
5
s/DIV
1550L/51L F05
Figure 5. Output Ripple with 10
F Tantalum Capacitor
VOUT
AC COUPLE
5mV/DIV
Figure 3. Output Ripple Test Circuit
Figure 4. Output Ripple vs Output Capacitance
OUTPUT CAPACITANCE (
F)
8
7
6
5
4
3
2
1
0
10
1550L/51L F04
OUTPUT
RIPPLE
(mV
P-P
)
1
100
VCC = 5V
TA = 25°C
CIN = 2.2F
WITHOUT 0.1
F
WITH 0.1
F
1
2
VCC
8
7
REG
CPOUT
SHDN
VCC
C1+
VOUT
LTC1551L
GND
C1–
COUT
10
F
1550L/51L F03
VOUT
– 4.1V
CCP
0.1
F
C1
0.1
F
CIN
2.2
F
3
4
6
5
CL
0.1
F
+
R1
10k
10
s/DIV
1550L/51L F06
VOUT
AC COUPLE
2mV/DIV
Figure 6. Output Ripple with 10
F Tantalum
Capacitor Paralleled with 0.1
F Ceramic Capacitor
相关PDF资料 |
PDF描述 |
|---|---|
| LM3706YKBPX-308 | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PBGA9 |
| LKP5660-6ERD5T | 2-OUTPUT 250 W AC-DC PWR FACTOR CORR MODULE |
| LKP5660-6PD8B1 | 2-OUTPUT 250 W AC-DC PWR FACTOR CORR MODULE |
| LKP5660-6RD3T | 2-OUTPUT 250 W AC-DC PWR FACTOR CORR MODULE |
| LKP5661-5EPD8 | 2-OUTPUT 250 W AC-DC PWR FACTOR CORR MODULE |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1551LCS8 | 功能描述:IC REG SWITCHD CAP INV ADJ 8SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:500 系列:- 类型:切换式电容器（充电泵），反相 输出类型:固定 输出数:1 输出电压:-3V 输入电压:2.3 V ~ 5.5 V PWM 型:Burst Mode? 频率 - 开关:900kHz 电流 - 输出:100mA 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:SOT-23-6 细型，TSOT-23-6 包装:带卷 (TR) 供应商设备封装:TSOT-23-6 其它名称:LTC1983ES6-3#TRMTR |
| LTC1551LCS8#PBF | 功能描述:IC REG SWITCHD CAP INV ADJ 8SOIC 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:500 系列:- 类型:切换式电容器（充电泵），反相 输出类型:固定 输出数:1 输出电压:-3V 输入电压:2.3 V ~ 5.5 V PWM 型:Burst Mode? 频率 - 开关:900kHz 电流 - 输出:100mA 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:SOT-23-6 细型，TSOT-23-6 包装:带卷 (TR) 供应商设备封装:TSOT-23-6 其它名称:LTC1983ES6-3#TRMTR |
| LTC1551LCS8#TR | 功能描述:IC REG SWITCHD CAP INV ADJ 8SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 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:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
| LTC1551LCS8#TRPBF | 功能描述:IC REG SWITCHD CAP INV ADJ 8SOIC 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:20 系列:SIMPLE SWITCHER® 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:12V 输入电压:4 V ~ 60 V PWM 型:电压模式 频率 - 开关:52kHz 电流 - 输出:1A 同步整流器:无 工作温度:-40°C ~ 125°C 安装类型:通孔 封装/外壳:16-DIP（0.300"，7.62mm） 包装:管件 供应商设备封装:16-DIP 其它名称:*LM2575HVN-12LM2575HVN-12 |
| LTC1551LCS8-4.1 | 功能描述:IC REG SWITCHED CAP INV 8SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:500 系列:- 类型:切换式电容器（充电泵），反相 输出类型:固定 输出数:1 输出电压:-3V 输入电压:2.3 V ~ 5.5 V PWM 型:Burst Mode? 频率 - 开关:900kHz 电流 - 输出:100mA 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:SOT-23-6 细型，TSOT-23-6 包装:带卷 (TR) 供应商设备封装:TSOT-23-6 其它名称:LTC1983ES6-3#TRMTR |
发布紧急采购，3分钟左右您将得到回复。