MAX762CSA データシートの表示（PDF） - Maxim Integrated
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MAX762CSA Datasheet PDF : 12 Pages
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12V/15V or Adjustable, High-Efficiency,
Low IQ, Step-Up DC-DC Converters
Reference Capacitor
Bypass REF with a 0.1µF capacitor. REF can source up
to 100µA.
Setting the Low-Battery Detector Voltage
To set the low-battery detector’s falling trip voltage
(VTRIP), select R3 between 10kΩ and 500kΩ (Figures 2
and 3), and calculate R4 as follows:
R4 = R3 [ (VTRIP - VREF) ]
VREF
where VREF = 1.5V.
The rising trip voltage is higher because of the compara-
tor’s hysteresis of approximately 20mV, and can be cal-
culated by:
VTRIP(rising) = (VREF + 20mV)(1 + R4/R3).
Connect a high-value resistor (larger than R3 + R4)
between LBI and LBO if additional hysteresis is required.
Connect a pull-up resistor (e.g., 100kΩ) between LBO
and VOUT. Tie LBI to GND or V+ and leave LBO floating
if the low-battery detector is not used.
___________Applications Information
Layout Considerations
Proper PC board layout is essential because of high cur-
rent levels and fast switching waveforms that radiate
noise. 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 con-
figuration). Also minimize lead lengths to reduce stray
capacitance, trace resistance, and radiated noise. The
traces connected to FB and LX, in particular, must be
short. Place bypass capacitor C2 as close as possible to
V+ and GND.
Table 1. Component Suppliers
PRODUCTION METHOD
INDUCTORS
CAPACITORS
DIODES
Surface Mount
Sumida
CD54-180 (22µH)
Coiltronics
CTX 100-series
Matsuo
267 series
Nihon
EC10 series
Miniature Through-Hole
Low-Cost Through-Hole
Sumida
RCH855-180M
Renco
RL 1284-18
Sanyo
OS-CON series
Low-ESR organic
semiconductor
Nichicon
PL series
Low-ESR electrolytics
United Chemi-Con
LXF series
Motorola
1N5817,
MUR105
Coiltronics
Matsuo
Matsuo
Nichicon
Nihon
Renco
Sanyo
Sanyo
Sumida
Sumida
United Chem-Con
(USA)
(USA)
(Japan)
(USA)
(USA)
(USA)
(USA)
(Japan)
(USA)
(Japan)
(USA)
(407) 241-7876
(714) 969-2491
81-6-337-6450
(708) 843-7500
(805) 867-2555
(516) 586-5566
(619) 661-6835
(0720) 70-1005
(708) 956-0666
81-3-607-5111
(714) 255-9500
FAX (407) 241-9339
FAX (714) 960-6492
FAX 81-6-337-6456
FAX (708) 843-2798
FAX (805) 867-2556
FAX (516) 586-5562
FAX (619) 661-1055
FAX (0720) 70-1174
FAX 81-3-607-5144
FAX (714) 255-9400
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