參數(shù)資料
型號： SP7648
英文描述： Low Reference High Efficiency Boost Regulator
中文描述： 高效率低參考升壓穩(wěn)壓器
文件頁數(shù)： 7/12頁
文件大小： 236K
代理商： SP7648
7
Date: 7/20/05
SP7648 Ultra-low Quiescent Current, High Efficiency Boost Regulator Copyright 2005 Sipex Corporation
For the example, a 10
μ
H inductor would
have an inductor current ripple of 350mA,
while a 4.7
μ
H inductor would have an in-
ductor current ripple value of 740mA. Do not
allow tantalum capacitors to exceed their
ripple-current ratings. An input filter capaci-
tor can reduce peak currents drawn from
the battery and improve efficiency. For
most applications, use the same capacitor
for the input and output.
Low-ESR tantalum capacitors are accept-
able provided they meet the ESR require-
ment of 0.2
to 0.3
. In selecting an
inductor, the saturation current specified for
the inductor needs to be greater than the
SP7648 peak current to avoid saturating
the inductor, which would result in a loss of
efficiency and could damage the inductor.
The SP7648 evaluation board uses a Wurth
4.7
μ
H inductor with an I
SAT
value of 1.7A
and a DCR of 0.065
, which handles the
I
PEAK
of 1.6A of the SP7648 and will deliver
high efficiencies. Other inductors could be
selected provided their I
SAT
is greater than
the I
PEAK
of the SP7648.
THEORY OF OPERATION
______________ V
OUT
PROGRAMMING
The SP7648 can be programmed as either
a voltage source or a current source. To
program the SP7648 as voltage source, the
SP7648 requires 2 feedback resistors R1 &
R2 to control the output voltage. To set V
OUT
in the voltage mode, use the equation:
R1 = [(V
OUT
/0.8)-1] * R2, where flash < 0.4V,
R1 = [(V
OUT
/0.288)-1] * R2, where flash > 1.0V
_______________________ USING THE
R
LIM
FUNCTION
The peak inductor current, I
PEAK
, is pro-
grammed externally by the R
LIM
resistor
connected between the R
LIM
pin and GND.
The peak inductor current is defined by:
I
PEAK
= 1600/R
LIM
The saturation current specified for the in-
ductor needs to be greater than the peak
INDUCTORS - SURFACE MOUNT
Inductor Specification
Size LxWxH
(mm)
4.8x4.8x1.8
6.0x6.0x2.5
6.1x6.1x2.2
4.8x4.8x1.8
6.0x6.0x2.5
6.1x6.1x2.2
Inductance
(uH)
4.7
4.7
4.7
6.8
6.8
6.8
Manufacturer/Part No.
Series R
ohms
0.070
0.031
0.065
0.080
0.044
0.100
CAPACITORS - SURFACE MOUNT
Isat
(A)
1.70
1.50
1.85
1.50
1.30
1.45
Inductor Type
Manufacturer
Website
www.we-online.de
www.tdk.com
www.coilcraft.com
www.we-online.de
www.tdk.com
www.coilcraft.com
Wurth Elektronik 744042004
TDK SLF6025T-4R7M1R5-PF
Coilcraft MSS6122-4R7MX
Wurth Elektronik 744042006
TDK SLF6025T-6R8M1R3-PF
Coilcraft MSS6122-6R8MX
Shielded Ferrite Core
Shielded Ferrite Core
Shielded Ferrite Core
Shielded Ferrite Core
Shielded Ferrite Core
Shielded Ferrite Core
Capacitor Specification
Size LxWxH
(mm)
2.0x1.2x1.35
2.0x1.2x1.35
Capacitance
(uF)
10
10
Manufacturer/Part No.
ESR
Ripple Current
10C Rise (A)
1.70
1.70
Voltage
(V)
6.3
6.3
Capacitor
Type
X5R Ceramic
X5R Ceramic
Manufacturer
Website
www.tdk.com
www.murata.com
ohms (max)
0.020
0.020
TDK C2012X5R0J106M
Murata GRM21BR60J106KE19L
MOSFETS - SURFACE MOUNT
MOSFET Specification
Package
Size
SC70-6
SOT23-3
MOSFET
type
NMOS
NMOS
Manufacturer/Part No.
RDS(on)
ohms
0.190
0.070
RESISTORS - LOW VALUE SURFACE MOUNT
Id
(A)
1.70
2.20
Manufacturer
Website
www.vishay.com
www.fairchildsemi.com
Vishay Si1400DL
Fairchild FDN337N
Resistor Specification
Package
Size
0603
0603
Resistor
Ref. Des.
Rc, R2
Rc, R2
Note: Components highlighted in
bold
are those used on the SP7648EB Evaluation Board.
Manufacturer/Part No.
Resistance
ohms
0.33
0.22
Pd
(W)
0.10
0.10
Manufacturer
Website
www.vishay.com
www.vishay.com
Vishay CRCW0603R33F
Vishay CRCW0603R22F
30V, Vgs = 2.5V, Pd = 0.5W
MOSFET
Specifications
20V, Vgs = 2.5V, Pd = 0.5W
Resistor
Specifications
Thick Film 1% or 5%
Thick Film 1% or 5%
Table 1: Component Selection
相關(guān)PDF資料
PDF描述
SP7648ER Low Reference High Efficiency Boost Regulator
SP7648EU Low Reference High Efficiency Boost Regulator
SP7648TR Low Reference High Efficiency Boost Regulator
SP7650 Wallmount ULTRX Series Fiberglass Enclosure; NEMA Type:1, 2, 4, 4X, 12, 13; Enclosure Material:Fiberglass; External Height:24.61"; External Width:24.11"; External Depth:12.64"; Enclosure Color:Light Gray
SP7651 Wide Input Voltage Range 3A, 900kHz, Buck Regulator
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SP7648_05 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Evaluation Board Manual
SP7648_06 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:PackageLow Reference High efficiency Boost Regulator
SP7648EB 功能描述:電源管理IC開發(fā)工具 Ultra Low Quies Cur Hi-Eff Boost Reg RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
SP7648ER 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Low Reference High Efficiency Boost Regulator
SP7648ER/TR 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:PackageLow Reference High efficiency Boost Regulator
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*