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參數(shù)資料
| 型號： | LTC1550LCS8#TR-4.1 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHED CAPACITOR REGULATOR, 900 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SO-8 |
| 文件頁數(shù)： | 12/12頁 |
| 文件大?。?/td> | 271K |
| 代理商： | LTC1550LCS8#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
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1550LIGN | 功能描述:IC REG SWITCHED CAP INV 16SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 標準包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關:600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應商設備封裝:8-SOIC |
| LTC1550LIGN#PBF | 功能描述:IC REG SWITCHED CAP INV 16SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 標準包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關:600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應商設備封裝:8-SOIC |
| LTC1550LIGN#TR | 功能描述:IC REG SWITCHED CAP INV 16SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 標準包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關:600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應商設備封裝:8-SOIC |
| LTC1550LIGN#TRPBF | 功能描述:IC REG SWITCHED CAP INV 16SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 標準包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關:600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應商設備封裝:8-SOIC |
| LTC1551CS8-4.1 | 功能描述:IC REG SWITCHED CAP INV 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 標準包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關:600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應商設備封裝:8-SOIC |
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