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LT3845AEFE#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26
LT3845A
4
3845afa
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LT3845A includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
Note 3: The LT3845AE is guaranteed to meet performance specifications
from 0°C to 125°C junction temperature. Specifications over the –40°C
to 125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LT3845AI is guaranteed over the full –40°C to 125°C operating junction
temperature range. The LT3845AMP is 100% tested and guaranteed over
the –55°C to 125°C temperature range.
Note 4: V
IN
voltages below the start-up threshold (7.5V) are only
supported when the V
CC
is externally driven above 6.5V.
Note 5: Operating range is dictated by MOSFET absolute maximum V
GS
.
Note 6: Supply current specification does not include switch drive
currents. Actual supply currents will be higher.
Note 7: DC measurement of gate drive output “ON” voltage is typically
8.6V. Internal dynamic bootstrap operation yields typical gate “ON”
voltages of 9.8V during standard switching operation. Standard operation
gate “ON” voltage is not tested but guaranteed by design.
Note 8: The –2V absolute maximum on the SW pin is a transient condition.
It is guaranteed by design and not subject to test.
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 20V, V
CC
= BOOST = BURST_EN = 10V, SHDN = 2V, R
SET
= 49.9kΩ,
SENSE
–
= SENSE
+
= 10V, SGND = PGND = SW = SYNC = 0V, unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
TG, BG Drive On Voltage (Note 7)
TG, BG Drive Off Voltage
C
LOAD
= 3300pF
C
LOAD
= 3300pF
9.8
0.1
V
V
TG, BG Drive Rise/Fall Time 10% to 90% or 90% to 10%, C
LOAD
= 3300pF 50 ns
Minimum TG Off Time
l
350 650 ns
Minimum TG On Time
l
250 400 ns
Gate Drive Nonoverlap Time TG Fall to BG Rise
BG Fall to TG Rise
200
150
ns
ns
LT3845A
5
3845afa
Shutdown Threshold (Rising)
vs Temperature
V
CC
vs Temperature
V
CC
vs I
CC(LOAD)
I
CC
Current Limit vs Temperature
V
CC
UVLO Threshold (Rising)
vs Temperature I
CC
vs V
CC
(SHDN = 0V)
Error Amp Transconductance
vs Temperature
TYPICAL PERFORMANCE CHARACTERISTICS
3845A G01
SHUTDOWN THRESHOLD, RISING (V)
1.38
1.37
1.36
1.35
1.34
1.33
1.32
TEMPERATURE (°C)
–50 25 75–25 0 50 100 125
Shutdown Threshold (Falling)
vs Temperature
3845A G02
TEMPERATURE (°C)
–50
SHUTDOWN THRESHOLD, FALLING (V)
1.26
1.25
1.24
1.23
1.22
1.21
1.20
25 75–25 0 50 100 125
TEMPERATURE (°C)
–50 25 75–25 0 50 100 125
3845A G03
8.2
8.1
8.0
7.9
7.8
7.7
7.6
7.5
V
CC
(V)
I
CC
= 20mA
I
CC(LOAD)
(mA)
0
V
CC
(V)
40
3845A G04
10
20
30
8.05
8.00
7.95
7.90
7.85
5 15 25
35
T
A
= 25°C
V
CC
vs V
IN
3845A G05
V
IN
(V)
V
CC
(V)
9
8
7
6
5
4
3
4
6
8
9
5 7
10
11
12
I
CC
= 20mA
T
A
= 25°C
–50 –25 1000 50 12525 75
TEMPERATURE (°C)
225
200
175
150
125
100
75
50
3845A G06
I
CC
CURRENT LIMIT (mA)
3845A G07
TEMPERATURE (°C)
–50 25 75–25 0 50 100
125
V
CC
UVLO THRESHOLD, RISING (V)
6.5
6.4
6.3
6.2
6.1
6.0
3845A G08
V
CC
(V)
0
I
CC
(µA)
15
20
25
16
10
5
0
2 4 6
8 10
12 14 18
20
T
A
= 25°C
TEMPERATURE (°C)
–50
ERROR AMP TRANSCONDUCTANCE (µS)
350
345
340
335
330
325
320
25 75
3845A G09
–25 0
50 100 125
LT3845A
6
3845afa
Maximum Current Sense
Threshold vs Temperature
TEMPERATURE (°C)
–50
CURRENT SENSE THRESHOLD (mV)
102
104
106
25 75
3845A G13
100
98
–25 0
50 100 125
96
94
V
IN
UVLO Threshold (Rising)
vs Temperature
TEMPERATURE (°C)
–50 25 75
–25 0
50 100 125
3845A G14
4.54
4.52
4.50
4.48
4.46
4.44
4.42
4.40
V
IN
UVLO THRESHOLD, RISING (V)
V
IN
UVLO Threshold (Falling)
vs Temperature
TEMPERATURE (°C)
–50 25 75
–25 0
50 100 125
3845A G15
V
IN
UVLO THRESHOLD, FALLING (V)
3.86
3.84
3.82
3.80
3.78
3.76
TYPICAL PERFORMANCE CHARACTERISTICS
I
(SENSE
+
+ SENSE
–
)
vs V
SENSE(CM)
Operating Frequency
vs Temperature
V
SENSE(CM)
(V)
0 0.5 1.5 2.5 3.5 4.5
I
(SENSE
+
+ SENSE
–
)
(µA)
800
600
400
200
0
–200
–400
1.0 2.0 3.0 4.0
3845A G10
5.0
T
A
= 25°C
TEMPERATURE (°C)
–50
290
OPERATING FREQUENCY (kHz)
292
296
298
300
50
308
3845A G11
294
0
–25
75 100
25 125
302
304
306
TEMPERATURE (°C)
–50 25 75
3845A G12
–25 0
50 100 125
1.234
1.233
1.232
1.231
1.230
1.229
1.228
1.227
ERROR AMP REFERENCE (V)
Error Amp Reference
vs Temperature
DUTY CYCLE (%)
0 40 60 70 80
10 20 30
50 90 100
3845A G16
CURRENT SENSE THRESHOLD (mV)
0
10
20
30
40
50
60
70
80
90
100
Current Sense Threshold
vs Duty Cycle
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LT3845AEFE#PBF

Mfr. #:
Buy LT3845AEFE#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators High Voltage Synchronous Current Mode Step-Down Controller with Adjustable Operating Frequency
Lifecycle:
New from this manufacturer.
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