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LTC7803 Datasheet(PDF) 8 Page - Analog Devices

Part # LTC7803
Description  40V Low IQ, 3MHz Synchronous Step-Down Controller with Spread Spectrum
PDF  36 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

LTC7803 Datasheet(HTML) 8 Page - Analog Devices

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LTC7803
8
Rev 0
For more information www.analog.com
TYPICAL PERFORMANCE CHARACTERISTICS
EXTVCC Switchover and INTVCC
Voltage vs Temperature
Maximum Current Sense
Threshold vs ITH Voltage
SENSE pin Input Current vs
VSENSE Voltage
SENSE Pin Input Current
vs Temperature
SENSE Pin Input Current vs ITH
Voltage
Foldback Current Limit
Oscillator Frequency vs
Temperature
Charge Pump Charging Current
vs Operating Frequency
Charge Pump Charging Current vs
Switch Voltage
INTVCC
EXTVCC RISING
EXTVCC FALLING
TEMPERATURE (°C)
–55
25
5
35
65
95
125 155
3.8
4.0
4.2
4.4
4.6
4.8
5.0
5.2
5.4
5.6
5.8
Voltages vs Temperature
EXTVCC Switchover and INTVCC
7803 G19
PULSE–SKIPPING MODE
FORCED CONTINUOUS MODE
BURST MODE
OPERATION
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
60
Threshold vs ITH Voltage
Maximum Current Sense
7803 G20
SENSE– PIN
SENSE+ PIN
VSENSE COMMON MODE VOLTAGE (V)
0
5
10
15
20
25
30
35
40
0
50
100
150
200
250
300
350
400
450
500
550
600
650
700
750
800
vs VSENSE Voltage
SENSE Pin Input Current
7803 G21
SENSE– = 12V
SENSE+ PIN
SENSE– < 2.9V
SENSE– = 3.2V
TEMPRATURE (°C)
–55 –25
5
35
65
95
125 155
0
50
100
150
200
250
300
350
400
450
500
550
600
650
700
750
800
vs Temperature
SENSE Pin Input Current
7803 G22
SENSE– < 2.9V
SENSE+ PIN
SENSE−=12V
SENSE– = 3.2V
ITH VOLTAGE (V)
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
0
50
100
150
200
250
300
350
400
450
500
550
600
650
700
750
800
vs ITH Voltage
SENSE Pin Input Current
7803 G23
FEEDBACK VOLTAGE (mV)
0
100 200 300 400 500 600 700 800
0
10
20
30
40
50
60
70
Foldback Current Limit
7803 G24
RFREQ=374k(100kHz)
RFREQ=75k(500kHz)
RFREQ=12.5k(3MHz)
RFREQ=GND(375kHz)
RFREQ=INTVCC(2.25MHz)
TEMPERATURE (°C)
–55 –25
5
35
65
95
125 155
–5
–4
–3
–2
–1
0
1
2
3
4
5
6
7
vs Temperature
Oscillator Frequency
7803 G25
VSW = 12V
T = 25°C
VBOOST – VSW = 4V
T = 155°C
T = –55°C
OPERATING FREQUENCY (kHz)
0
600
1200
1800
2400
3000
30
40
50
60
70
80
90
100
vs Operating Frequency
Charge Pump Charging Current
7803 G26
VBOOST – VSW = 4V
FREQ = INTVCC
FREQ = GND
SWITCH VOLTAGE (V)
0
5
10
15
20
25
30
35
40
0
10
20
30
40
50
60
70
80
90
100
vs Switch Voltage
Charge Pump Charging Current
7803 G27



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