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LTC7803 Datasheet(PDF) 9 Page - Analog Devices

Part # LTC7803
Description  40V, Low IQ, 3MHz, Triple Output Buck/Buck/Boost Synchronous Controller
PDF  44 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

LTC7803 Datasheet(HTML) 9 Page - Analog Devices

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LTC7817
9
Rev 0
For more information www.analog.com
TYPICAL PERFORMANCE CHARACTERISTICS
Buck Foldback Current Limit
SENSE1,2– and SENSE3+ Input
Current vs Temperature
SENSE1,2+ and SENSE3− Input
Current vs Temperature
Current Sense Threshold vs ITH
Voltage
SENSE1,2– and SENSE3+ Current
vs Voltage
Maximum Current Sense
Threshold vs SENSE Common
Mode Voltage
PULSE–SKIPPING
BURST MODE
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
Threshold vs ITH Voltage
Maximum Current Sense
7817 G19
SENSE1– CURRENT
SENSE2– OR SENSE3+ 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
vs Voltage
SENSE1,2– and SENSE3+ Current
7817 G20
SENSE VOLTAGE (V)
0
5
10
15
20
25
30
35
40
0
10
20
30
40
50
60
70
vs SENSE Common Mode Voltage
Maximum Current Sense Threshold
7817 G21
FEEDBACK VOLTAGE (mV)
0
100 200 300 400 500 600 700 800
0
10
20
30
40
50
60
70
Buck Foldback Current Limit
7817 G22
SENSE1– = INTVCC–0.5V
SENSE2–,SENSE3+ = INTVCC–0.5V
SENSE = INTVCC+0.5V
MODE = INTVCC
TEMPERATURE (oC)
–55 –25
5
35
65
95
125 155
–100
0
100
200
300
400
500
600
700
800
900
Current vs Temperature
SENSE1,2–, SENSE3+ Input
7817 G23
MODE = INTVCC
SENSE = 0V
SENSE = 1V
SENSE = 3.3V
SENSE = 12V
TEMPERATURE (oC)
–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
Current vs Temperature
SENSE1,2+ and SENSE3– Input
7817 G24
Oscillator Frequency
vs Temperature
BOOST3 Charge Pump Output
Current vs Frequency
BOOST3 Charge Pump Output
Current vs SW3 Voltage
RFREQ=374k (100kHz)
RFREQ=75k (500kHz)
RFREQ=12.5k (3MHz)
FREQ=GND (380kHz)
FREQ=INTVCC (2.25MHz)
TEMPERATURE (oC)
–55 –25
5
35
65
95
125 155
–6
–4
–2
0
2
4
6
8
10
vs Temperature
Oscillator Frequency
7817 G25
SW3 = 12V
BOOST3 = 16V
150°C
–55°C
25°C
FREQUENCY (kHz)
0
500
1000 1500 2000 2500 3000
0
10
20
30
40
50
60
70
80
90
100
Current vs Frequency
BOOST3 Charge Pump Output
7817 G26
FREQ = 0V
BOOST3–SW3 = 4V
150°C
–55°C
25°C
SW3 VOLTAGE (V)
0
5
10
15
20
25
30
35
0
10
20
30
40
50
60
70
80
90
100
Current vs SW3 Voltage
BOOST3 Charge Pump Output
7817 G27



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