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LT3045 データシート(PDF) 10 Page - Analog Devices

部品番号 LT3045
部品情報  18V, 1A Step-Down Silent Switcher 3 with Ultra-Low Noise Reference
PDF  45 Pages
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メーカー  AD [Analog Devices]
ホームページ  http://www.analog.com
Logo AD - Analog Devices

LT3045 データシート(HTML) 10 Page - Analog Devices

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Data Sheet
LT83201
analog.com
Rev. A 10 of 45
TYPICAL PERFORMANCE CHARACTERISTICS
TA = 25°C, unless otherwise noted.
Figure 4. Noise Spectral Density vs. Load
Figure 5. Noise Spectral Density vs. CSET
Figure 6. Noise Spectral Density vs. Switching Frequency
Figure 7. Noise Spectral Density (0.1Hz to 10Hz)
Figure 8. Power-Supply Ripple Rejection
Figure 9. 12VIN to 1VOUT Efficiency (FCM)
(VO,RMS = INTEGRATED NOISE FROM 10Hz TO 100kHz)
VIN = 12V, VOUT = 3.3V, fSW = 2MHz
RC = 2.32kΩ, CC = 1.5nF, CSET = 1µF
TYPICAL APPLICATION CIRCUIT
ILOAD = 0.5A (VO,RMS = 4.66µVRMS)
ILOAD = 1A (VO,RMS = 4.72µVRMS)
FREQUENCY (Hz)
10
100
1k
10k
100k
1M
1
10
100
1000
(VO,RMS = INTEGRATED NOISE
FROM 10Hz TO 100kHz)
TYPICAL APPLICATION CIRCUIT
VIN = 12V, VOUT = 3.3V, fSW = 2MHz
RC = 2.32kΩ, CC = 1.5nF, ILOAD = 1A
CSET = 4.7µF (VO,RMS = 5.08µVRMS)
CSET = 1.0µF (VO,RMS = 4.72µVRMS)
CSET = 100nF (VO,RMS = 4.57µVRMS)
FREQUENCY (Hz)
10
100
1k
10k
100k
1M
1
10
100
1000
(VO,RMS = INTEGRATED NOISE FROM 10Hz TO 100kHz)
TYPICAL APPLICATION CIRCUIT
fSW = 2MHz (VO,RMS = 4.72µVRMS)
fSW = 6MHz (VO,RMS = 2.08µVRMS)
LNA NOISE FLOOR (VO,RMS = 0.48µVRMS)
FREQUENCY (Hz)
10
100
1k
10k
100k
1M
1
10
100
1000
VIN = 12V, VOUT = 1V
RSET = 10kΩ, CSET = 4.7uF
FREQUENCY (Hz)
0.1
1
10
10
100
1000
2000
TYPICAL APPLICATION CIRCUIT
VIN = 12V, VOUT = 3.3V
ILOAD = 0A
ILOAD = 1A
FREQUENCY (Hz)
10
100
1k
10k
100k
1M
0
20
40
60
80
100
120
EFFICIENCY
POWER LOSS
L = XGL6060
1MHz, 3.30µH, (5.9mΩ)
2MHz, 1.50µH, (3.3mΩ)
3MHz, 1.00µH, (2.5mΩ)
4MHz, 0.68µH, (2.0mΩ)
LOAD CURRENT (A)
0
0.2
0.4
0.6
0.8
1.0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
0
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
0.55
0.60
0.65
0.70
0.75
0.80



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