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LTC1550CGN Datasheet(PDF) 8 Page - Linear Technology

Part # LTC1550CGN
Description  Low Noise, Switched Capacitor Regulated Voltage Inverters
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1550CGN Datasheet(HTML) 8 Page - Linear Technology

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8
LTC1550/LTC1551
APPLICATIONS INFORMATION
output capacitors provide lower output ripple. To keep
ripple below 1mVP-P, 10µF or greater, with a 0.1µF ceramic
capacitor in parallel, is required. At least 4.7
µF is required
at the output under all conditions to guarantee loop
stability.
Figure 3 shows a marked decrease in peak-to-peak output
ripple when a 0.1
µF ceramic capacitor added in parallel
with the tantalum output capacitor. The additional ripple
with the tantalum output capacitor alone is mostly very
high order harmonics of the 900kHz clock, which appear
as sharp "spikes" at the output. The energy in these spikes
is very small and they do not contribute to the RMS output
voltage, but their peak-to-peak amplitude can be several
Figure 5. Output Ripple with 10
µF Tantalum
Capacitor Paralleled with 0.1
µF Ceramic Capacitor
10
µs/DIV
LTC1550/51 • F04
VOUT
AC COUPLE
2mV/DIV
millivolts under some conditions. A garden variety 0.1
µF
ceramic capacitor has significantly lower impedance at the
spike frequency than even a large tantalum capacitor, and
helps eliminate most of these left-over switching spikes
that the tantalum capacitor leaves behind. Figure 4 and 5
show scope photos of the output of Figure 3 with and
without the additional ceramic capacitor at the output.
A series RC or LC filter can reduce high frequency output
noise even further. Due to the high 900kHz switching
frequency, not much R or L is required; a ferrite bead or a
relatively long PC board trace in series with 0.1
µF ceramic
capacitor will usually keep the output ripple well below
1mVP-P. The cover page shows an example of an ultralow
5
µs/DIV
LTC1550/51 • F03
Figure 4. Output Ripple with 10
µF Tantalum Capacitor
VOUT
AC COUPLE
5mV/DIV
Figure 2. Output Ripple Test Circuit
1
2
VCC
8
7
SENSE
CPOUT
SHDN
VCC
C1+
VOUT
LTC1551
GND
C1
COUT
10
µF
1550/51 F03
VOUT
– 4.1V
CCP
0.1
µF
C1
0.1
µF
CIN
4.7
µF
3
4
6
5
CL
0.1
µF*
*CL IS OPTIONAL
+
Figure 3. Output Ripple vs Output Capacitance
OUTPUT CAPACITANCE (
µF)
8
7
6
5
4
3
2
1
0
10
LTC1550/51 • F04
1
100
VCC = 6V
TA = 25°C
CIN = 4.7µF
WITHOUT 0.1
µF
WITH 0.1
µF


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