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參數(shù)資料
| 型號(hào)： | LTC1551 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Low Noise, Switched Capacitor Regulated Voltage Inverters() |
| 中文描述： | 低噪聲，開(kāi)關(guān)電容穩(wěn)壓逆變器（） |
| 文件頁(yè)數(shù)： | 8/12頁(yè) |
| 文件大?。?/td> | 287K |
| 代理商： | LTC1551 |
8
LTC1550/LTC1551
APPLICATIO
S I
FOR
ATIO
U
output capacitors provide lower output ripple. To keep
ripple below 1mV
P-P
, 10
μ
F or greater, with a 0.1
μ
F ceramic
capacitor in parallel, is required. At least 4.7
μ
F is required
at the output under all conditions to guarantee loop
stability.
Figure 3 shows a marked decrease in peak-to-peak output
ripple when a 0.1
μ
F ceramic capacitor 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
W
U
U
Figure 5. Output Ripple with 10
μ
F Tantalum
Capacitor Paralleled with 0.1
μ
F Ceramic Capacitor
10
μ
s/DIV
LTC1550/51 F04
V
AC COUPLE
2mV/DIV
millivolts under some conditions. A garden variety 0.1
μ
F
ceramic capacitor has significantly lower impedance at the
spike frequency than even a large tantalum capacitor, and
helps eliminate most of these left-over switching spikes
that the tantalum capacitor leaves behind. Figure 4 and 5
show scope photos of the output of Figure 3 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
μ
F ceramic
capacitor will usually keep the output ripple well below
1mV
P-P
. The cover page shows an example of an ultralow
5
μ
s/DIV
LTC1550/51 F03
Figure 4. Output Ripple with 10
μ
F Tantalum Capacitor
V
AC COUPLE
5mV/DIV
Figure 2. Output Ripple Test Circuit
1
2
V
CC
8
7
SENSE
CP
OUT
SHDN
V
CC
C1
+
V
OUT
LTC1551
GND
C1
–
C
OUT
10
F
1550/51 F03
V
–4.1V
C
CP
0.1
μ
F
C1
0.1
μ
F
C
IN
4.7
μ
F
3
4
6
5
C
L
0.1
μ
F*
*C
L
IS OPTIONAL
+
+
Figure 3. Output Ripple vs Output Capacitance
OUTPUT CAPACITANCE (
μ
F)
8
7
6
5
4
3
2
1
0
10
LTC1550/51 F04
O
P
)
1
100
V
CC
= 6V
T
A
= 25
°
C
C
IN
= 4.7
μ
F
WITHOUT 0.1
μ
F
WITH 0.1
μ
F
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| 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(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)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(kāi)關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無(wú) 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(yīng)商設(shè)備封裝:8-SOIC |
| LTC1551CS8-4.1#PBF | 功能描述:IC REG SWITCHED CAP INV 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)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(kāi)關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無(wú) 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(yīng)商設(shè)備封裝:8-SOIC |
| LTC1551CS8-4.1#TR | 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(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)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(kāi)關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無(wú) 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(yīng)商設(shè)備封裝:8-SOIC |
| LTC1551CS8-4.1#TRPBF | 功能描述:IC REG SWITCHED CAP INV 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)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(kāi)關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無(wú) 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(yīng)商設(shè)備封裝:8-SOIC |
| LTC1551LCMS8 | 功能描述:IC REG SWITCHD CAP INV ADJ 8MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)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(kāi)關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無(wú) 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(yīng)商設(shè)備封裝:8-SOIC |
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