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SP6641BEK-L-5-0 Datasheet(PDF) 9 Page - Sipex Corporation

Part # SP6641BEK-L-5-0
Description  500mA Alkaline DC/DC Boost Regulator in SOT-23
Download  13 Pages
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Manufacturer  SIPEX [Sipex Corporation]
Direct Link  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SP6641BEK-L-5-0 Datasheet(HTML) 9 Page - Sipex Corporation

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9
Rev. 5/26/05,
*Patent Pending
SP6641A/6641B 500mA Alkaline DC/DC Boost Regulator in SOT-23
© Copyright 2002 Sipex Corporation
APPLICATION INFORMATION: continued
TABLE 1. COMPONENT SELECTION
INDUCTORS - SURFACE MOUNT
Inductor Specification
Sipex
Inductance
Manufacturer/
Series R
Isat
Size LxWxH
Inductor
Manufacturer
Part Number
(µH)
Part Number
(Ω)
(A)
(mm)
Type
Website
SP6641A Ipk = .33A
22
Sumida CDRH5D28-220
0.095
0.90
5.7x5.5x3
Shielded Ferrite Core
www.sumida.com
SP6641A Ipk = .33A
22
Coilcraft DO1608C-223
0.370
0.70
6.6x4.5x2.9
Unshielded Ferrite Core
www.coilcraft.com
SP6641A Ipk = .33A
22
TDK NLC453232T-220
0.900
0.37
4.4x3.2x3.2
Unshielded Ferrite Core
www.tdk.com
SP6641A Ipk = .33A
22
Murata LQH43C220K04
0.600
0.42
4.5x3.2x2.6
Unshielded Ferrite Core
www.murata.com
SP6641B Ipk = 1A
10
Sumida CDRH5D28-100
0.065
1.30
5.7x5.5x3
Shielded Ferrite Core
www.sumida.com
SP6641B Ipk = 1A
10
Coilcraft DO1608C-103
0.160
1.10
6.6x4.5x2.9
Unshielded Ferrite Core
www.coilcraft.com
SP6641B Ipk = 1A
10
Murata LQH55DN100M01
0.077
1.70
5x5x4.7
Unshielded Ferrite Core
www.murata.com
SP6641B Ipk = 1A
22
Sumida CDRH6D28-220
0.128
1.20
6.7x6.5x3
Shielded Ferrite Core
www.sumida.com
SP6641B Ipk = 1A
22
Murata LQH55DN220M01
0.160
1.20
5x5x4.7
Unshielded Ferrite Core
www.murata.com
CAPACITORS - SURFACE MOUNT & THRU-HOLE
Capacitor Specification
ESR
Ripple
Size
Sipex
Capacitance
Manufacturer/
(max)
Current
LxWxH
Voltage
Capacitor
Manufacturer
Part Number
(µF)
Part Number
(Ω)@ 45°C (A)
(mm)
(V)
Type
Website
SP6641A Ipk = .33A
22
TDK C3225X5R0J226M 0.010
4.00
1210
6.3
SMT X5R Cer.
www.tdk.com
SP6641B Ipk = 1A
100
SANYO 10TPA100M
0.080
1.20
7343
6.3
SMT POSCAP Tant. www.sanyovideo.com
SP6641B Ipk = 1A
100
SANYO 16SA100M
0.030
2.70
8Dx10L
16.0
Thru-hole OS-CON
www.sanyovideo.com
SCHOTTKY DIODE - SURFACE MOUNT
Diode Specification
Sipex
Manufacturer/
VF @ IF
IF(AV)
Size LxWxH
Reverse V
Package
Manufacturer
Part Number
Part Number
(V)
(A)
(mm)
(V)
Type
Website
SP6641A Ipk = .33A
STMicro STPS0520Z
0.39
0.50
3.9x1.7x1.3
20
SOD-123
www.st.com
SP6641B Ipk = 1A
Zetex ZCHS2000
0.42
2.00
3x3x1.4
40
SOT23-6
www.zetex.com
Note: Components highlighted in bold are those used on the SP6641A or SP6641B Evaluation Board.
Maximum Startup Current
It should be noted that for low input voltages the
SP6641 startup circuit can not support large
load currents at startup. In startup the SP6641
needs to boost the output from zero volts using
a charge pump which has a limited current
capacity. Once the output is greater than 1.7 to
1.9V the operate circuit takes over and the
SP6641 can supply much more current. Curves
of maximum resistive load current in startup for
the SP6641A and SP6641B are shown in Fig-
ures 13 & 14 and can be compared with Figure
2, maximum load current in operation. Also,
Table 2 provides SP6641A 3.3V resistive load
current in startup for some low cost 1812 size
chip inductors.
From the curves in Figures 13 and 14, you can
see that for low input voltages, the 22
µH induc-
tor has more current capacity at startup than the
10
µH inductor, due to more energy per charge
cycle in the relationship 1/2LI2. Thus for 1 cell
applications, 22
µH is recommended for more
startup current than 10
µH.
For 1-cell battery applications, it is recommended
to apply any large load current after the SP6641
has started up, typically in a few millisecs. This
is typically not a problem in many applications
where the load is a processor whose load current
is low until the processor voltage comes up.


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