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LTC7802EUFDM 数据表(PDF) 7 Page - Analog Devices

部件名 LTC7802EUFDM
功能描述  40V Low IQ, 3MHz Dual, 2-Phase Synchronous Step-Down Controller with Spread Spectrum
PDF  34 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

LTC7802EUFDM 数据表(HTML) 7 Page - Analog Devices

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LTC7802
7
Rev. 0
For more information www.analog.com
TYPICAL PERFORMANCE CHARACTERISTICS
Current Sense Threshold
vs ITH Voltage
SENSE1,2– Input Current
vs VSENSE Voltage
SENSE1,2+ Input Current
vs VSENSE Voltage
Foldback Current Limit
SENSE1,2– Input Current
vs Temperature
SENSE1,2+ Input Current
vs Temperature
Maximum Current Sense
Threshold vs SENSE– Voltage
Oscillator Frequency
vs Temperature
RUN Pin Thresholds vs
Temperature
PULSE–SKIPPING
Burst Mode OPERATION
FORCED CONTINUOUS
ITH VOLTAGE (V)
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
–30
–20
–10
0
10
20
30
40
50
7802 G10
SENSE1– CURRENT
SENSE2– CURRENT
MODE = INTVCC
SENSE– VOLTAGE (V)
0
5
10
15
20
25
30
35
40
0
100
200
300
400
500
600
700
800
900
SENSE Current vs Voltage
7802 G11
MODE = INTVCC
SENSE+ VOLTAGE (V)
0
5
10
15
20
25
30
35
40
–1.0
–0.8
–0.6
–0.4
–0.2
0.0
0.2
0.4
0.6
0.8
1.0
7802 G12
FEEDBACK VOLTAGE (mV)
0
100 200 300 400 500 600 700 800
0
10
20
30
40
50
60
70
Foldback Current Limit
7802 G13
SENSE1– = INTVCC–0.5V
SENSE2– = INTVCC–0.5V
SENSE1,2– = INTVCC+0.5V
MODE = INTVCC
TEMPERATURE (°C)
–55 –25
5
35
65
95
125 155
–100
0
100
200
300
400
500
600
700
800
900
SENSE Current vs Temperature
7802 G14
MODE = INTVCC
SENSE+ = 0V
SENSE+ = 1V
SENSE+ = 3.3V
SENSE+ = 12V
TEMPERATURE (°C)
–55 –25
5
35
65
95
125 155
–1.0
–0.8
–0.6
–0.4
–0.2
0.0
0.2
0.4
0.6
0.8
1.0
SENSE Current vs Temperature
7802 G15
SENSE– VOLTAGE (V)
0
5
10
15
20
25
30
35
40
0
10
20
30
40
50
60
70
7802 G16
RFREQ = 374k (100kHz)
RFREQ = 75k (500kHz)
RFREQ = 12.5k (3MHz)
FREQ = GND (350kHz)
FREQ =INTVCC (2.25MHz)
TEMPERATURE (°C)
–55 –25
5
35
65
95
125 155
–6
–4
–2
0
2
4
6
8
10
7802 G17
RISING
FALLING
TEMPERATURE (°C)
–55 –25
5
35
65
95
125 155
1.06
1.08
1.10
1.12
1.14
1.16
1.18
1.20
1.22
1.24
1.26
vs Temperature
7802 G18



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