LT3971IDD View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LT3971IDD Datasheet PDF : 28 Pages
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LT3971/LT3971-3.3/LT3971-5
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT3971EDD-5#PBF
LT3971EDD-5#TRPBF LFRP
10-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
LT3971IDD-5#PBF
LT3971IDD-5#TRPBF LFRP
10-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
LT3971EMSE-5#PBF
LT3971EMSE-5#TRPBF LTFRQ
10-Lead Plastic MSOP
–40°C to 125°C
LT3971IMSE-5#PBF
LT3971IMSE-5#TRPBF LTFRQ
10-Lead Plastic MSOP
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VEN = 12V, VBD = 3.3V unless otherwise noted. (Note 2)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Minimum Input Voltage
(Note 4)
l
4
4.3
V
Quiescent Current from VIN
LT3971 FB Pin Current
Internal Feedback Resistor Divider (LT3971-X)
VEN Low
VEN High, VSYNC Low
VEN High, VSYNC Low
VFB = 1.19V
0.7
1.2
μA
1.7
2.7
μA
l
4.5
μA
l
0.1
12
nA
10
MΩ
Feedback Voltage
1.175
1.19
1.205
V
l 1.165
1.19
1.215
V
LT3971-3.3 Output Voltage
3.25
3.3
3.35
V
l 3.224
3.3
3.376
V
LT3971-5 Output Voltage
4.93
5
5.07
V
l 4.89
5
5.11
V
FB Voltage Line Regulation
Switching Frequency
Minimum Switch On Time
4.3V < VIN < 38V (Note 4)
RT = 11k
RT = 35.7k
RT = 255k
0.0002 0.01
%/V
1.6
2
2.4
MHz
0.8
1
1.2
MHz
160
200
240
kHz
80
ns
Minimum Switch Off Time
110
150
ns
Switch Current Limit
1.8
2.4
3
A
Switch VCESAT
Switch Leakage Current
ISW = 1A
330
mV
0.02
1
μA
Boost Schottky Forward Voltage
Boost Schottky Reverse Leakage
Minimum Boost Voltage (Note 3)
BOOST Pin Current
EN Voltage Threshold
ISH = 100mA
VREVERSE = 12V
VIN = 5V
ISW = 1A, VBOOST = 15V
EN Rising
770
mV
0.02
1
μA
l
1.4
1.8
V
20
28
mA
l 0.95
1.01
1.07
V
EN Voltage Hysteresis
30
mV
EN Pin Current
0.2
20
nA
LT3971 PG Threshold Offset from VFB
LT3971 PG Hysteresis
VFB Rising
60
100
140
mV
20
mV
LT3971-X PG Threshold Offset from VOUT
LT3971-X PG Hysteresis
VOUT Rising
5.5
9
12.5
%
1.3
%
3971fd
3
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