EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
MSE PACKAGE
10-LEAD PLASTIC MSOP
θ
JA
= 45°C/W,
θ
JC
= 10°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LT3972EDD#PBF
LT3972IDD#PBF
LT3972EMSE#PBF
LT3972IMSE#PBF
LT3972HMSE#PBF
TAPE AND REEL
LT3972EDD#TRPBF
LT3972IDD#TRPBF
LT3972EMSE#TRPBF
LT3972IMSE#TRPBF
LT3972HMSE#TRPBF
PART MARKING*
LDXR
LDXR
LTDXS
LTDXS
LTDXS
PACKAGE DESCRIPTION
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead Plastic MSOP
10-Lead Plastic MSOP
10-Lead Plastic MSOP
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 150°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
V
IN
Overvoltage Lockout
Quiescent Current from V
IN
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 10V, V
RUN/SS
= 10V, V
BOOST
= 15V, V
BD
= 3.3V unless otherwise
noted. (Note 2)
CONDITIONS
●
●
MIN
33
TYP
3
35
0.01
30
120
MAX
3.6
37
0.5
65
160
UNITS
V
V
μA
μA
μA
3972fa
V
RUN/SS
= 0.2V
V
BD
= 3V, Not Switching
V
BD
= 0, Not Switching
●
2
LT3972
ELECTRICAL CHARACTERISTICS
PARAMETER
Quiescent Current from BD
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 10V, V
RUN/SS
= 10V, V
BOOST
= 15V, V
BD
= 3.3V unless otherwise
noted. (Note 2)
CONDITIONS
V
RUN/SS
= 0.2V
V
BD
= 3V, Not Switching
V
BD
= 0, Not Switching
Minimum Bias Voltage (BD Pin)
Feedback Voltage
●
●
MIN
TYP
0.01
90
1
2.7
MAX
0.5
130
5
3
800
805
40
0.01
UNITS
μA
μA
μA
V
mV
mV
nA
%/V
μmho
μA
μA
A/V
V
780
775
790
790
10
0.002
500
2000
60
60
5.3
2
FB Pin Bias Current (Note 3)
FB Voltage Line Regulation
Error Amp g
m
Error Amp Gain
V
C
Source Current
V
C
Sink Current
V
C
Pin to Switch Current Gain
V
C
Clamp Voltage
Switching Frequency
V
FB
= 0.8V, V
C
= 1.2V
4V < V
IN
< 33V
●
R
T
= 8.66k
R
T
= 29.4k
R
T
= 187k
●
2.2
1.0
200
4.6
2.45
1.1
230
60
5.4
335
0.02
2.7
1.25
260
150
6.2
2
2
50
8
2.5
MHz
MHz
kHz
ns
A
mV
μA
V
mA
μA
V
V
mV
mV
Minimum Switch Off-Time
Switch Current Limit
Switch V
CESAT
Boost Schottky Reverse Leakage
Minimum Boost Voltage (Note 4)
BOOST Pin Current
RUN/SS Pin Current
RUN/SS Input Voltage High
RUN/SS Input Voltage Low
PG Threshold Offset from Feedback Voltage
PG Hysteresis
PG Leakage
PG Sink Current
SYNC Low Threshold
SYNC High Threshold
SYNC Pin Bias Current
V
SYNC
= 0V
V
PG
= 5V
V
PG
= 0.4V
V
FB
Rising
I
SW
= 1A
V
RUN/SS
= 2.5V
Duty Cycle = 5%
I
SW
= 3.5A
V
BD
= 0V
●
1.5
35
5
0.2
65
10
0.1
1
μA
μA
V
●
200
0.5
800
0.7
0.1
V
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 LT3972E is guaranteed to meet performance specifications
from 0°C to 125°C. Specifications over the –40°C to 125°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LT3972I specifications are
guaranteed over the –40°C to 125°C temperature range. The LT3972H
specifications are guaranteed over the –40°C to 150°C operating
temperature range. High junction temperatures degrade operating
lifetimes. Operating lifetime is derated at junction temperatures greater
than 125°C.
Note 3:
Bias current flows out of the FB pin.
Note 4:
This is the minimum voltage across the boost capacitor needed to
guarantee full saturation of the switch.
Note 5:
Absolute Maximum at V
IN
and RUN/SS pins is 62V for non-
repetitive 1 minute transients, and 40V for continuous operation.
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