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LTC1551L Datasheet(PDF) 9 Page - Linear Technology

Part # LTC1551L
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

LTC1551L Datasheet(HTML) 9 Page - Linear Technology

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LTC1550L/LTC1551L
APPLICATIONS INFORMATION
Figure 4 shows a marked decrease in peak-to-peak output
ripple when a 0.1
µF ceramic capacitor is 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
millivolts under some conditions. A 0.1
µF ceramic capaci-
tor has significantly lower impedance at the spike fre-
quency than a large tantalum capacitor, and eliminates
most of these left-over switching spikes that the tantalum
capacitor leaves behind. Figure 5 and 6 show scope photos
of the output of Figure 4 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. Figure 1 shows an example of an ultralow noise
– 2V generator. The corresponding spectrum and spot
noise plots for this circuit are shown in the Typical Perfor-
mance Characteristics section.
5
µs/DIV
1550L/51L F05
Figure 5. Output Ripple with 10
µF Tantalum Capacitor
VOUT
AC COUPLE
5mV/DIV
Figure 3. Output Ripple Test Circuit
Figure 4. Output Ripple vs Output Capacitance
OUTPUT CAPACITANCE (
µF)
8
7
6
5
4
3
2
1
0
10
1550L/51L F04
1
100
VCC = 5V
TA = 25°C
CIN = 2.2µF
WITHOUT 0.1
µF
WITH 0.1
µF
1
2
VCC
8
7
REG
CPOUT
SHDN
VCC
C1+
VOUT
LTC1551L
GND
C1
COUT
10
µF
1550L/51L F03
VOUT
– 4.1V
CCP
0.1
µF
C1
0.1
µF
CIN
2.2
µF
3
4
6
5
CL
0.1
µF
+
R1
10k
10
µs/DIV
1550L/51L F06
VOUT
AC COUPLE
2mV/DIV
Figure 6. Output Ripple with 10
µF Tantalum
Capacitor Paralleled with 0.1
µF Ceramic Capacitor


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