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LTC7151S Datasheet(PDF) 11 Page - Analog Devices

Part # LTC7151S
Description  18V, 3A/5A Step-Down Silent Switcher 3 with Ultra-Low Noise Reference
PDF  44 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

LTC7151S Datasheet(HTML) 11 Page - Analog Devices

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Data Sheet
LT83203/LT83205
analog.com
Rev. B
11 of 44
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 1VOUTEfficiency
VIN = 12V, VOUT = 1V, fSW = 2MHz
RC = 1.82kΩ, CC = 2.2nF, CSET = 2.2µF
(VO,RMS = INTEGRATED NOISE FROM 10Hz TO 100kHz)
TYPICAL APPLICATION CIRCUIT
ILOAD = 0A (VO,RMS = 4.42µVRMS)
ILOAD = 1A (VO,RMS = 4.51µVRMS)
ILOAD = 3A (VO,RMS = 4.93µVRMS)
ILOAD = 5A (VO,RMS = 5.64µVRMS)
FREQUENCY (Hz)
10
100
1k
10k
100k
1M
1
10
100
1000
VIN = 12V, VOUT = 1V, fSW = 2MHz
RC = 1.82kΩ, CC = 2.2nF, ILOAD = 1A
(VO,RMS = INTEGRATED NOISE FROM 10Hz TO 100kHz)
TYPICAL APPLICATION CIRCUIT
CSET = 4.7µF (VO,RMS = 4.50µVRMS)
CSET = 2.2µF (VO,RMS = 4.51µVRMS)
CSET = 1.0µF (VO,RMS = 4.58µVRMS)
CSET = 100nF (VO,RMS = 4.63µVRMS)
FREQUENCY (Hz)
10
100
1k
10k
100k
1M
1
10
100
1000
TYPICAL APPLICATION CIRCUIT
(VO,RMS = INTEGRATED NOISE FROM 10Hz TO 100kHz)
fSW = 2MHz (VO,RMS = 4.42µVRMS)
fSW = 6MHz (VO,RMS = 1.93µVRMS)
LNA NOISE FLOOR (VO,RMS = 0.44µVRMS)
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 = 1V
ILOAD = 0A
ILOAD = 1A
ILOAD = 3A
ILOAD = 5A
FREQUENCY (Hz)
10
100
1k
10k
100k
1M
0
20
40
60
80
100
120
EFFICIENCY
POWER LOSS
L = XGL6060
1MHz, 1.50µH, (3.3mΩ)
2MHz, 0.68µH, (2.0mΩ)
3MHz, 0.47µH, (1.5mΩ)
4MHz, 0.22µH, (1.1mΩ)
LOAD CURRENT (A)
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
0
0.4
0.8
1.2
1.6
2.0
2.4
2.8
3.2
3.6
4.0
4.4
4.8
5.2
5.6
6.0
6.4
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0



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