EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
MSE PACKAGE
10-LEAD PLASTIC MSOP
θ
JA
= 45°C,
θ
JC
= 10°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LT3971AIMSE#PBF
LT3971AIMSE-5#PBF
TAPE AND REEL
LT3971AIMSE#TRPBF
LT3971AIMSE-5#TRPBF
PART MARKING*
LTGFQ
LTGFR
PACKAGE DESCRIPTION
10-Lead Plastic MSOP
10-Lead Plastic MSOP
TEMPERATURE RANGE
–40°C to 125°C
–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
PARAMETER
Minimum Input Voltage
Quiescent Current from V
IN
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 12V, V
EN
= 12V, V
BD
= 3.3V unless otherwise noted. (Note 2)
CONDITIONS
(Note 4)
V
EN
Low
V
EN
High, V
SYNC
Low
V
EN
High, V
SYNC
Low
V
FB
= 1.19V
MIN
l
l
l
TYP
4
0.7
1.7
0.1
10
LT3971A FB Pin Current
Internal Feedback Resistor Divider (LT3971A-5)
MAX
4.3
1.2
2.7
4.5
12
UNITS
V
μA
μA
μA
nA
MΩ
3971af
2
LT3971A/LT3971A-5
ELECTRICAL CHARACTERISTICS
V
OUT
Pin Current
V
OUT
Pin Clamp Voltage
Feedback Voltage
LT3971A-5 Output Voltage
FB Voltage Line Regulation
Switching Frequency
4.3V < V
IN
< 38V (Note 4)
R
T
= 11k
R
T
= 35.7k
R
T
= 255k
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 12V, V
EN
= 12V, V
BD
= 3.3V unless otherwise noted. (Note 2)
V
OUT
= 5V
V
OUT
= 5V
I
VOUT
= –2mA
l
l
l
–0.65
–0.90
9
1.176
1.173
4.94
4.93
1.8
0.8
160
Minimum Switch On Time
Minimum Switch Off Time
Switch Current Limit
Switch V
CESAT
Switch Leakage Current
Boost Schottky Forward Voltage
Boost Schottky Reverse Leakage
Minimum Boost Voltage (Note 3)
BOOST Pin Current
EN Voltage Threshold
EN Voltage Hysteresis
EN Pin Current
LT3971A PG Threshold Offset from V
FB
LT3971A PG Hysteresis
LT3971A-5 PG Threshold Offset from V
OUT
LT3971A-5 PG Hysteresis
PG Leakage
PG Sink Current
SYNC Threshold
SYNC Pin Current
SS Source Current
2.0
I
SW
= 1A
I
SH
= 100mA
V
REVERSE
= 12V
V
IN
= 5V
I
SW
= 1A, V
BOOST
= 15V
EN Rising
l
l
0.95
V
FB
Rising
V
OUT
Rising
V
PG
= 3V
V
PG
= 0.4V
60
5.5
l
300
0.6
0.6
V
SS
= 1V
–0.5
–0.5
11
1.192
1.19
5.01
5
0.0002
2.2
1
200
80
110
2.5
330
0.02
770
0.02
1.4
20
1.01
30
0.2
100
20
9
1.3
0.02
570
0.8
0.1
1
–0.38
–0.32
13
1.204
1.207
5.06
5.07
0.01
2.6
1.2
240
150
3.2
1
1
1.8
28
1.07
20
140
12.5
1
1.0
1.6
μA
μA
V
V
V
V
V
%/V
MHz
MHz
kHz
ns
ns
A
mV
μA
mV
μA
V
mA
V
mV
nA
mV
mV
%
%
μA
μA
V
nA
μA
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 LT3971AI is guaranteed over the full –40°C to 125°C operating
junction temperature range. High junction temperatures degrade operating
lifetimes. Operating lifetime is derated at junction temperatures greater
than 125°C.
Note 3:
This is the minimum voltage across the boost capacitor needed to
guarantee full saturation of the switch.
Note 4:
Minimum input voltage depends on application circuit.
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