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參數(shù)資料
| 型號(hào)： | SP6659EK1-1.5/TR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.3 A SWITCHING REGULATOR, 1800 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封裝： | SOT-23, 5 PIN |
| 文件頁數(shù)： | 11/11頁 |
| 文件大小： | 204K |
| 代理商： | SP6659EK1-1.5/TR |
9
Date: 08/15/05
SP6659 1.5MHz, 600mA Synchronous Buck Regulator
Copyright 2005 Sipex Corporation
THEORY OF OPERATION
choose an inductor with DC series resis-
tance in the 50m to 150m range. For
higher efficiency at heavy loads (above
200mA), or minimal load regulation (but
some transient overshoot), the resistance
should be kept below 100m. The DC cur-
rent rating of the inductor should be at least
equal to the maximum load current plus half
the ripple current to prevent core saturation
(600mA+105mA).
Table 1 lists some typical surface mount
inductors that meet target applications for
the SP6659.
Table 1: Typical Surface Mount Inductors
________________ INPUT CAPACITOR
SELECTION
The input capacitor reduces the surge cur-
rent drawn from the input and switching
noise from the device. The input capacitor
impedance at the switching frequency shall
be less than input source impedance to
prevent high frequency switching current
from passing to the input. A low ESR (Equiva-
lent Series Resistance) input capacitor sized
for maximum RMS current must be used.
Ceramic capacitors with X5R or X7R dielec-
trics are highly recommended because of
their low ESR and small temperature coeffi-
cients. A 4.7F ceramic capacitor for most
applications is sufficient.
______________ OUTPUT CAPACITOR
SELECTION
The output capacitor is required to keep the
output voltage ripple small and to ensure
regulation loop stability. The output capaci-
tor must have low impedance at the switch-
ing frequency. Ceramic capacitors with X5R
or X7R dielectrics are recommended due to
their low ESR and high ripple current. The
output ripple VOUT is determined by:
X
{ESR +
}
1
(8X
OSC X COUT)
VOUT ≤
VOUT X (VINMax - VOUT)
VINMax X L X
OSC
SP6659 Inductor Selection Chart
Murata
LQH32CN2R2M11
1.0
78
1000
3.2x2.5x1.55
Murata
LQH32CN2R2M11
2.2
126
790
3.2x2.5x1.55
Murata
LQH32CN4R7M11
4.7
195
650
3.2x2.5x1.55
1.4
56.2
2.52
2.2
71.2
1.5
3.3
86.2
1.44
4.7
108.7
1.15
1.5
2.2
75
1.32
3.3
110
1.04
4.7
162
0.84
1.5
120
1.29
2.2
140
1.14
3.3
180
0.98
4.7
240
0.79
Inductor in
Bold is used on the SP6659EB evaluation Board
4.7x4.7x2.0
Size WxLxH
(mm)
Sumida CR43
Sumida CDRH4D18
Toko D312C
Part #
Inductor
(H)
Max DCR
(m)
Rated DC
Current
(Amps)
4.5x4.0x3.5
3.6x3.6x1.2
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP6659EK118 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:1.5MHz, 600mA Synchronous Buck Regulator |
| SP6659EK118/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:1.5MHz, 600mA Synchronous Buck Regulator |
| SP6659EK1-L | 制造商:Exar Corporation 功能描述:REG BUCK 1.5MHZ 0.6A TSOT23-5 |
| SP6659EK1-L/TR | 功能描述:DC/DC 開關(guān)控制器 1.5MHz, 600mA Synchronous RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| SP6659EK1-L-1-5/TR | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 1.5MHz, 600mA Synchronous RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
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