MAX1674 Datasheet, PDF (11/12 Pages) Maxim Integrated Products – High-Efficiency, Low-Supply-Current, Compact, Step-Up DC-DC Converters

High-Efficiency, Low-Supply-Current,
Compact, Step-Up DC-DC Converters
Table 1. Suggested Components
PRODUCTION
METHOD
Surface Mount
Miniature Through-Hole
INDUCTORS
Sumida CD43 series
Sumida CD54 series
Coilcraft DT1608C
Coilcraft DO1608C
Coiltronics Uni-PAC
Murata LQH4 series
Sumida RCH654-220
CAPACITORS
Sprague 593D series
Sprague 595D series
AVX TPS series
ceramic
Sanyo OS-CON series
RECTIFIERS
(OPTIONAL)
Motorola MBR0530
Nihon EC 15QS02L
—
Table 2. Surface-Mount Inductor
Specifications
MANUFACTURER
PART NUMBER
µH
Ω (max)
I_PEAK (A)
HEIGHT
(mm)
Coilcraft DT1608C-103 10 0.095
0.7
2.92
Coilcraft DO1608C-153 15 0.200
0.9
2.92
Coilcraft DO1608C-223 22 0.320
0.7
2.92
Coiltronics UP1B-100 10 0.111
1.9
5.0
Coiltronics UP1B-150 15 0.175
1.5
5.0
Coiltronics UP1B-220 22 0.254
1.2
5.0
Murata LQH4N100
10 0.560
0.4
2.6
Murata LQH4N220
22 0.560
0.4
2.6
Sumida CD43-8R2
8.2 0.132
1.26
3.2
Sumida CD43-100
10 0.182
1.15
3.2
Sumida CD54-100
10 0.100
1.44
4.5
Sumida CD54-180
18 0.150
1.23
4.5
Sumida CD54-220
22 0.180
1.11
4.5
Table 3. Component Suppliers
COMPANY
AVX
Coilcraft
Coiltronics
Motorola
PHONE
USA [phone]
USA [phone]
USA [phone]
USA [phone]
[phone]
FAX
USA [phone]
USA [phone]
USA [phone]
USA [phone]
Murata
USA [phone]
[phone]
USA [phone]
Nihon
USA [phone] USA [phone]
Japan 81-3-3494-7411 Japan 81-3-3494-7414
Sanyo
USA [phone] USA [phone]
Japan 81-7-2070-6306 Japan 81-7-2070-1174
Sprague
USA [phone] USA [phone]
Sumida
USA [phone] USA [phone]
Japan 81-3-3607-5111 Japan 81-3-3607-5144
Taiyo Yuden USA [phone] USA [phone]
Capacitor Selection
A 47µF, 10V surface-mount tantalum (SMT) output filter
capacitor provides 80mV output ripple when stepping
up from 2V to 5V. Smaller capacitors (down to 10µF
with higher ESRs) are acceptable for light loads or in
applications that can tolerate higher output ripple.
Values in the 10µF to 100µF range are recommended.
The equivalent series resistance (ESR) of both bypass
and filter capacitors affects efficiency and output rip-
ple. Output voltage ripple is the product of the peak
inductor current and the output capacitor ESR. Use
low-ESR capacitors for best performance, or connect
two or more filter capacitors in parallel. Low-ESR, SMT
tantalum capacitors are currently available from
Sprague (595D series) AVX (TPS series) and other
sources. Ceramic surface-mount and Sanyo OS-CON
organic-semiconductor through-hole capacitors also
exhibit very low ESR, and are especially useful for oper-
ation at cold temperatures. See Table 3 for a list of sug-
gested component suppliers.
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