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LTC7813 Datasheet(PDF) 7 Page - Linear Technology

Part # LTC7813
Description  150V Low IQ, Synchronous Step-Down DC/DC Controller
PDF  38 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC7813 Datasheet(HTML) 7 Page - Linear Technology

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LTC3895
7
3895fa
For more information www.linear.com/LTC3895
Typical perForMance characTerisTics
SENSE– Pin Input Current
vs VSENSE Voltage
SENSE– Pin Input Bias Current
vs Temperature
Undervoltage Lockout Threshold
vs Temperature
Foldback Current Limit
Maximum Current Sense
Threshold vs ITH Voltage
RUN/OVLO Threshold
vs Temperature
DRVCC and EXTVCC
vs Load Current
EXTVCC Switchover and DRVCC
Voltages vs Temperature
EXTVCC Switchover and DRVCC
Voltages vs Temperature
EXTVCC = 5V
VIN LDO (No NDRV FET),
EXTVCC = 0V
NDRV LDO (NDRV FET),
EXTVCC = 0V
EXTVCC = 8.5V
DRVUV = DRVSET = 0V
LOAD CURRENT (mA)
0
20
40
60
80
100
4.0
4.5
5.0
5.5
6.0
6.5
3895 G10
DRVUV = DRVSET = 0V
EXTVCC RISING
EXTVCC FALLING
EXTVCC = 8.5V
NDRV LDO (NDRV FET),
EXTVCC = 0V
VIN LDO (No NDRV FET),
EXTVCC = 0V,
TEMPERATURE (°C)
–75 –50 –25 0
25 50 75 100 125 150
4.0
4.5
5.0
5.5
6.0
6.5
3895 G11
DRVUV = DRVSET = INTVCC
EXTVCC RISING
EXTVCC FALLING
EXTVCC = 8.5V
NDRV LDO (NDRV NFET),
EXTVCC = 0V
VIN LDO (No NDRV NFET),
EXTVCC = 0V
TEMPERATURE (°C)
–75 –50 –25 0
25 50 75 100 125 150
7.0
7.5
8.0
8.5
9.0
9.5
10.0
10.5
3895 G12
VSENSE COMMON MODE VOLTAGE (V)
0 5 10 15 20 25 30 35 40 45 50 55 60 65
0
100
200
300
400
500
600
700
800
900
1000
3895 G13
VOUT ≥ INTVCC + 0.5V
VOUT ≤ INTVCC – 0.5V
TEMPERATURE (°C)
–75 –50 –25 0
25 50 75 100 125 150
0
100
200
300
400
500
600
700
800
900
1000
3895 G14
RISING
RISING
FALLING
FALLING
DRVUV = INTVCC
DRVUV = 0V
TEMPERATURE (°C)
–75 –50 –25 0
25 50 75 100 125 150
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
3895 G15
ILIM = FLOAT
ILIM = GND
ILIM = INTVCC
FEEDBACK VOLTAGE (mV)
0
100 200 300 400 500 600 700 800
0
10
20
30
40
50
60
70
80
90
100
3895 G16
5% DUTY CYCLE
PULSE–SKIPPING
BURST MODE
OPERATION
ILIM = GND
ILIM = INTVCC
ILIM = FLOAT
FORCED CONTINUOUS
VITH (V)
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
–40
–20
0
20
40
60
80
100
3895 G17
OVLO RISING
RUN RISING
RUN FALLING
OVLO FALLING
TEMPERATURE (°C)
–75 –50 –25 0
25 50 75 100 125 150
1.00
1.05
1.10
1.15
1.20
1.25
1.30
1.35
1.40
3895 G18



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