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LT3970 Datasheet(PDF) 3 Page - Linear Technology

Part # LT3970
Description  40V, 350mA Step-Down Regulator with 2.5關A Quiescent Current and Integrated Diodes
PDF  22 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3970 Datasheet(HTML) 3 Page - Linear Technology

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



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