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SP7648EU Datasheet(PDF) 7 Page - Sipex Corporation

Part # SP7648EU
Description  PackageLow Reference High efficiency Boost Regulator
Download  13 Pages
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Manufacturer  SIPEX [Sipex Corporation]
Direct Link  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SP7648EU Datasheet(HTML) 7 Page - Sipex Corporation

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7
Mar16-06 Rev B
SP7648 Ultra-low Quiescent Current, High Efficiency Boost Regulator
© 2006 Sipex Corporation
For the example, a 10µH inductor would
have an inductor current ripple of 350mA,
while a 4.7µH inductor would have an in-
ductorcurrentripplevalueof740mA.Donot
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
4.7µH inductor with an ISAT value of 1.7A
and a DCR of 0.065 , which handles the
IPEAK of 1.6A of the SP7648 and will deliver
high efficiencies. Other inductors could be
selected provided their ISAT is greater than
the IPEAKof the SP7648.
THeORY OF OPeRaTiOn
VOUT 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 VOUT
in the voltage mode, use the equation:
R1 = [(VOUT/0.8)-1] * R2, where flash < 0.4V,
R1 = [(VOUT/0.288)-1] * R2, where flash > 1.0V
Using the RLIM Function
The peak inductor current, IPEAK, is pro
grammed externally by the RLIM resistor
connected between the RLIM pin and GND.
The peak inductor current is defined by:
IPEAK= 1600/R LIM
The saturation current specified for the in-
ductor needs to be greater than the peak
INDUCTORS - SURFACE MOUNT
Inductor Specification
Inductance
Manufacturer/Part No.
Series R
Isat
Size LxWxH
Inductor Type
Manufacturer
(uH)
ohms
(A)
(mm)
Website
4.7
Wurth Elektronik 744042004
0.070
1.70
4.8x4.8x1.8 Shielded Ferrite Core
www.we-online.de
4.7
TDK SLF6025T-4R7M1R5-PF
0.031
1.50
6.0x6.0x2.5 Shielded Ferrite Core
www.tdk.com
4.7
Coilcraft MSS6122-4R7MX
0.065
1.85
6.1x6.1x2.2 Shielded Ferrite Core
www.coilcraft.com
6.8
Wurth Elektronik 744042006
0.080
1.50
4.8x4.8x1.8 Shielded Ferrite Core
www.we-online.de
6.8
TDK SLF6025T-6R8M1R3-PF
0.044
1.30
6.0x6.0x2.5 Shielded Ferrite Core
www.tdk.com
6.8
Coilcraft MSS6122-6R8MX
0.100
1.45
6.1x6.1x2.2 Shielded Ferrite Core
www.coilcraft.com
CAPACITORS - SURFACE MOUNT
Capacitor Specification
Capacitance
Manufacturer/Part No.
ESR
Ripple Current
Size LxWxH
Voltage
Capacitor
Manufacturer
(uF)
ohms (max)
10C Rise (A)
(mm)
(V)
Type
Website
10
TDK C2012X5R0J106M
0.020
1.70
2.0x1.2x1.35
6.3
X5R Ceramic
www.tdk.com
10
Murata GRM21BR60J106KE19L
0.020
1.70
2.0x1.2x1.35
6.3
X5R Ceramic
www.murata.com
MOSFETS - SURFACE MOUNT
MOSFET Specification
MOSFET
Manufacturer/Part No.
RDS(on)
Id
Package
Manufacturer
type
ohms
(A)
Size
Website
NMOS
Vishay Si1400DL
0.190
1.70
SC70-6
www.vishay.com
NMOS
Fairchild FDN337N
0.070
2.20
SOT23-3
www.fairchildsemi.com
RESISTORS - LOW VALUE SURFACE MOUNT
Resistor Specification
Resistor
Manufacturer/Part No.
Resistance
Pd
Package
Manufacturer
Ref. Des.
ohms
(W)
Size
Website
Rc, R2
Vishay CRCW0603R33F
0.33
0.10
0603
www.vishay.com
Rc, R2
Vishay CRCW0603R22F
0.22
0.10
0603
www.vishay.com
Note: Components highlighted in boldare those used on the SP7648EB Evaluation Board.
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


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