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LTC7813 Datasheet(PDF) 6 Page - Linear Technology

Part # LTC7813
Description  Low IQ, 60V, High Frequency Synchronous Step-Down Controller
PDF  32 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC7813 Datasheet(HTML) 6 Page - Linear Technology

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LTC7800
6
7800f
For more information www.linear.com/LTC7800
TYPICAL PERFORMANCE CHARACTERISTICS
5 10 15 20 25 30 35 40 45 50 55 60
0
50
100
150
200
250
300
INPUT VOLTAGE (V)
7800 G10
NO LOAD
300µA LOAD
FIGURE 13 CIRCUIT
TEMPERATURE (°C)
–75
4.0
4.2
4.6
4.8
5.0
6.0
5.4
–25
25 50 75 100
7800 G11
4.4
5.6
5.8
5.2
–50
0
125 150
INTVCC
EXTVCC RISING
EXTVCC FALLING
VITH (V)
0
40
60
80
0.6
1.0
7800 G13
20
0
0.2
0.4
0.8
1.2
1.4
–20
–40
Burst Mode
OPERATION
PULSE-SKIPPING MODE
5% DUTY CYCLE
FORCED CONTINUOUS MODE
ILIM = FLOAT
ILIM = INTVCC
ILIM = GND
VSENSE COMMON MODE VOLTAGE (V)
0
20
7800 G14
400
300
10
15
5
25
800
700
600
500
200
100
0
–100
DUTY CYCLE (%)
0
50
40
60
70
80
7800 G15
30
20
20
40 50
100
80
60
10
30
90
70
ILIM = FLOAT
ILIM = INTVCC
ILIM = GND
Total Input Supply Current vs
Input Voltage
EXTVCC Switchover and INTVCC
Voltages vs Temperature
INTVCC Line Regulation
Maximum Current Sense Voltage
vs ITH Voltage
SENSE– Pin Input Bias Current
Maximum Current Sense
Threshold vs Duty Cycle
VIN = 12V
VOUT = 3.3V
ILOAD = 50mA
1µs/DIV
7800 G07
FORCED
CONTINUOUS
MODE
PULSE-SKIPPING
MODE
Burst Mode
OPERATION
2A/DIV
Inductor Current at Light Load
Soft Start-Up
Shutdown Current vs Input
Voltage
FIGURES 11, 12 CIRCUITS
2ms/DIV
7800 G08
VOUT = 5V
1V/DIV
VOUT = 3.3V
1V/DIV
INPUT VOLTAGE (V)
3.0
4.0
4.5
5.5
20
30 35 40 45 50 55 60 65
15
10
0 5
25
7800 G12
3.5
5.0
ILOAD = 10mA
INPUT VOLTAGE (V)
0
10
15
30
25
20
30 35 40 45 50 55 60 65
15
10
5
25
7800 G09
5
20



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