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LT8625SP Datasheet(PDF) 12 Page - Analog Devices

Part # LT8625SP
Description  42V, 1A/2.5A 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

LT8625SP Datasheet(HTML) 12 Page - Analog Devices

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Data Sheet
LT83401/LT83402
analog.com
Rev. 0
12 of 44
TYPICAL PERFORMANCE CHARACTERISTICS
TA = 25°C, unless otherwise noted
Figure 4. Noise Spectral Density vs. Load
See Typical Application Circuit (Figure 59)
Figure 5. Noise Spectral Density vs. CSET
See Typical Application Circuit (Figure 59)
Figure 6. Noise Spectral Density vs. fSW
See Typical Application Circuit (Figure 59)
Figure 7. Noise Spectral Density (0.1Hz to 10Hz)
Figure 8. Power-Supply Ripple Rejection
See Typical Application Circuit (Figure 59)
Figure 9. 12VIN to 3.3VOUTEfficiency
VIN = 12V, VOUT = 3.3V, fSW = 2MHz
RC = 1.0kΩ, CC = 4.7nF, CSET = 1µF
(VO,RMS = INTEGRATED NOISE FROM 10Hz TO 100kHz)
ILOAD
= 3.31µVRMS)
= 0A (VO,RMS
ILOAD = 1A (VO,RMS = 3.32µVRMS)
ILOAD = 2.5A (VO,RMS = 2.80µVRMS)
FREQUENCY (Hz)
10
100
1k
10k
100k
1M
1
10
100
1000
= INTEGRATED NOISE FROM 10Hz TO 100kHz)
CSET = 100nF (VO,RMS = 3.53µVRMS)
CSET = 1µF (VO,RMS = 2.80µVRMS)
CSET = 2.2µF (VO,RMS = 2.81µVRMS)
CSET = 4.7µF (VO,RMS = 2.87µVRMS)
FREQUENCY (Hz)
10
100
1k
10k
100k
1M
1
10
100
1000
VIN = 12V, VOUT = 3.3V, fSW = 2MHz
RC = 1.0kΩ, CC= 4.7nF, ILOAD = 2.5A
(VO,RMS
(VO,RMS = INTEGRATED NOISE FROM 10Hz TO 100kHz)
fSW = 2MHz (VO,RMS = 2.80µVRMS)
fSW = 6MHz (VO,RMS = 1.64µVRMS)
LOW-NOISE AMPLIFIER (LNA) NOISE FLOOR
(VO,RMS = 0.45µVRMS)
FREQUENCY (Hz)
10
100
1k
10k
100k
1M
1
10
100
1000
VIN = 12V, VOUT = 3.3V
RSET = 33.2kΩ, CSET = 1µF
FREQUENCY (Hz)
0.1
1
10
100
1000
10000
VIN = 12V, VOUT = 3.3V
ILOAD = 0A
ILOAD = 1A
ILOAD = 2.5A
FREQUENCY (Hz)
10
100
1k
10k
100k
1M
0
20
40
60
80
100
120
EFFICIENCY
POWER LOSS
L = XGL6060
1MHz, 4.7µH, (9.1mΩ)
2MHz, 2.2µH, (4.3mΩ)
3MHz, 1µH, (2.5mΩ)
LOAD CURRENT (A)
0
0.5
1.0
1.5
2.0
2.5
70
75
80
85
90
95
0
0.5
1.0
1.5
2.0
2.5



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