LT3970IDDB Ver la hoja de datos (PDF) - Linear Technology
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LT3970IDDB
Linear Technology
LT3970IDDB Datasheet PDF : 22 Pages
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LT3970/LT3970-3.3/LT3970-5
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VBD = 3.3V unless otherwise noted. (Note 2)
PARAMETER
CONDITIONS
MIN
TYP
MAX
Minimum Input Voltage
l
4
4.2
Quiescent Current from VIN
LT3970 Feedback Voltage
VEN Low
VEN High
VEN High, –40°C to 125°C
VEN High, –40°C to 150°C
0.7
1.2
1.7
2.7
l
3.5
l
4
1.195
1.21
1.225
l 1.185
1.21
1.235
LT3970-3.3 Output Voltage
–40°C to 125°C
–40°C to 150°C
3.26
3.3
3.34
l 3.234
3.3
3.366
l 3.217
3.3
3.366
LT3970-5 Output Voltage
–40°C to 125°C
–40°C to 150°C
4.94
5
5.06
l 4.9
5
5.1
l 4.875
5
5.1
LT3970 FB Pin Bias Current (Note 3)
FB/Output Voltage Line Regulation
Switching Frequency
Switch Current Limit
Catch Schottky Current Limit
VFB = 1.21V
4.2V < VIN < 40V
RT = 41.2k, VIN = 6V
RT = 158k, VIN = 6V
RT = 768k, VIN = 6V
VIN = 5V, VFB = 0V
VIN = 5V
l
0.1
20
0.0002 0.01
1.76
2.25
2.64
640
800
960
160
200
240
535
700
865
350
400
500
Switch VCESAT
Switch Leakage Current
ISW = 200mA
175
0.05
2
Catch Schottky Forward Voltage
Catch Schottky Reverse Leakage
Boost Schottky Forward Voltage
Boost Schottky Reverse Leakage
Minimum Boost Voltage (Note 4)
BOOST Pin Current
EN Pin Current
LT3970 EN Voltage Threshold
LT3970-X EN Voltage Threshold
EN Voltage Hysteresis
ISCH = 100mA, VIN = VBD = NC
VSW = 12V
ISCH = 50mA, VIN = NC, VBOOST = 0V
VREVERSE = 12V
VIN = 5V
ISW = 200mA, VBOOST = 15V
VEN = 12V
EN Rising, VIN ≥ 4.2V
EN Rising, VIN ≥ 4.2V
650
0.05
2
875
0.02
2
l
1.4
1.8
7
10
1
30
l 0.94
1
1.06
l 0.93
1
1.07
30
LT3970 PG Threshold Offset from Feedback Voltage VFB Rising
LT3970 PG Hysteresis
80
120
160
12
LT3970-X PG Threshold Offset from Output Voltage VFB Rising
LT3970-X PG Hysteresis as % of Output Voltage
6.5
10
13.5
1.0
PG Leakage
PG Sink Current
VPG = 3V
VPG = 0.4V
0.01
1
l 30
80
Minimum Switch On-Time
90
Minimum Switch Off-Time
VIN = 10V
l
100
160
UNITS
V
μA
μA
μA
μA
V
V
V
V
V
V
V
V
nA
%/V
MHz
kHz
kHz
mA
mA
mV
μA
mV
μA
mV
μA
V
mA
nA
V
V
mV
mV
mV
%
%
μA
μA
ns
ns
3970fa
3
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