5V or Adjustable, Low-Voltage,
Step-Up DC-DC Controller
MAX608
PRODUCTION
INDUCTORS
Sumida
CD54 series
CDR125 series
Coiltronics
CTX20 series
Coilcraft
DO3316 series
DO3340 series
CAPACITORS
Matsuo
267 series
Sprague
595D series
AVX
TPS series
Sanyo
OS-CON series
TRANSISTORS
Siliconix
Si9410DY
Si4410DY
Si6426DQ
Si6946DQ
Motorola
MTP3055EL
MTD20N03HDL
MMFT3055ELT1
DIODES
Central Semiconductor
CMPSH-3
CMPZ5240
Nihon
EC11 FS1 series (high-
speed silicon)
Motorola
MBRS1100T3
MMBZ5240BL
Motorola
1N5817–1N5822
MUR105 (high-speed
silicon)
SUPPLIER
AVX
Central
Semiconductor
Coilcraft
Coiltronics
Matsuo
Motorola
Nichicon
Nihon
Sanyo
Siliconix
Sprague
Sumida
PHONE
USA: (803) 448-9411
USA: (516) 435-1110
USA: (708) 639-6400
USA: (407) 241-7876
USA: (714) 969-2491
Japan: 81-6-337-6450
USA: (800) 521-6274
USA: (708) 843-7500
USA: (805) 867-2555
USA: (619) 661-6835
Japan: 81-7-2070-1005
USA: (800) 554-5565
USA: (603) 224-1961
USA: (708) 956-0666
Japan: 81-3-3607-5111
FAX
(803) 448-1943
(516) 435-1824
(708) 639-1469
(407) 241-9339
(714) 960-6492
81-6-337-6456
(602) 952-4190
(708) 843-2798
(805) 867-2556
(619) 661-1055
81-7-2070-1174
(408) 970-3950
(603) 224-1430
(708) 956-0702
81-3-3607-5144
Surface Mount
Through Hole
Sumida
RCH855 series
RCH110 series
Sanyo
OS-CON series
Nichicon
PL series
Feed-Forward Capacitor
When adjusting the output voltage, it may be necessary
to parallel a 47pF to 220pF capacitor across R2, as
shown in Figures 2 and 3. Choose the lowest capacitor
value that insures stability; high capacitance values
may degrade line regulation.
__________Applications Information
Starting Up Under Load
The
Typical Operating Characteristics
show the Start-Up
Voltage vs. Load Current graphs for 5V and 12V output
voltages. These graphs depend on the type of power
switch used. The MAX608 is not designed to start up
under full load with low input voltages.
Layout Considerations
Due to high current levels and fast switching wave-
forms, which radiate noise, proper PC board layout is
essential. Protect sensitive analog grounds by using a
star ground configuration. Minimize ground noise by
connecting GND, the input bypass capacitor ground
lead, and the output filter capacitor ground lead to a
single point (star ground configuration). Also, minimize
lead lengths to reduce stray capacitance, trace resis-
tance, and radiated noise. Place input bypass capaci-
tor C2 as close as possible to OUT and GND.
If an external resistor divider is used (Figures 2 and
3), the trace from FB to the resistors must be
extremely short.
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MAXIM [ MAXIM INTEGRATED PRODUCTS ]
