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LT8331 Datasheet(PDF) 16 Page - Analog Devices

Part # LT8331
Description  Low IQ Boost/SEPIC/Inverting Converter with 1.5A, 150V Switch
PDF  30 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

LT8331 Datasheet(HTML) 16 Page - Analog Devices

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LT8365
16
Rev. A
For more information www.analog.com
Multiple capacitors are often paralleled to meet ESR
requirements. Typically, once the ESR requirement is
satisfied, the capacitance is adequate for filtering and has
therequiredRMScurrentrating.Additionalceramiccapaci-
tors in parallel are commonly used to reduce the effect of
parasiticinductanceintheoutputcapacitor,whichreduces
high frequency switching noise on the converter output.
CERAMIC CAPACITORS
Ceramic capacitors are small, robust and have very low
ESR. However, ceramic capacitors can cause problems
whenusedwiththeLT8365duetotheirpiezoelectricnature.
When in Burst Mode operation, the LT8365’s switching
frequency depends on the load current, and at very light
loads the LT8365 can excite the ceramic capacitor at audio
frequencies, generating audible noise. Since the LT8365
operates at a lower current limit during Burst Mode op-
eration, the noise is typically very quiet to a casual ear.
If this is unacceptable, use a high performance tantalum
or electrolytic capacitor at the output. Low noise ceramic
capacitors are also available.
APPLICATIONS INFORMATION
Figure 5. Suggested Boost Converter Layout
Table 3. Ceramic Capacitor Manufacturers
Taiyo Yuden
(408) 573-4150
www.t-yuden.com
AVX
(803) 448-9411
www.avxcorp.com
Murata
(714) 852-2001
www.murata.com
BOOST CONVERTER: DIODE SELECTION
ASchottkydiodeisrecommendedforusewiththeLT8365.
Low leakage Schottky diodes are necessary when low
quiescentcurrentisdesiredatlowloads.Thediodeleakage
appears as an equivalent load at the output and should be
minimized.ChooseSchottkydiodeswithsufficientreverse
voltage ratings for the target applications.
Table 4. Recommended Schottky Diodes
PART NUMBER
AVERAGE
FORWARD
CURRENT
(A)
REVERSE
VOLTAGE
(V)
REVERSE
CURRENT
(µA)
MANUFACTURER
DFLS1150
1
150
2
Diodes, Inc.
RB068L150TE25
2
150
3
ROHM
DFLS2100
2
100
1
Diodes, Inc.
°
°
1
3
5
6
7
8
EN
VIN
INTVCC
NC
BIAS
VC
16
14
12
11
10
9
SW1
SW2
SYNC
SS
RT
FBX
PGND
GND
VOUT
SW
VOUT
PGND
VIN
SW
8365 F05



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