EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB
FE PACKAGE
20-LEAD PLASTIC TSSOP
T
JMAX
= 125°C,
θ
JA
= 38°C/W
EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LT3741EUF#PBF
LT3741IUF#PBF
LT3741EFE#PBF
LT3741IFE#PBF
LT3741EUF-1#PBF
LT3741IUF-1#PBF
LT3741EFE-1#PBF
LT3741IFE-1#PBF
TAPE AND REEL
LT3741EUF#TRPBF
LT3741IUF#TRPBF
LT3741EFE#TRPBF
LT3741IFE#TRPBF
LT3741EUF-1#TRPBF
LT3741IUF-1#TRPBF
LT3741EFE-1#TRPBF
LT3741IFE-1#TRPBF
http://www.linear.com/product/LT3741#orderinfo
PART MARKING*
3741
3741
LT3741FE
LT3741FE
37411
37411
LT3741FE-1
LT3741FE-1
PACKAGE DESCRIPTION
20-Lead (4mm × 4mm) Plastic QFN
20-Lead (4mm × 4mm) Plastic QFN
20-Lead Plastic TSSOP
20-Lead Plastic TSSOP
20-Lead (4mm × 4mm) Plastic QFN
20-Lead (4mm × 4mm) Plastic QFN
20-Lead Plastic TSSOP
20-Lead Plastic TSSOP
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 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
Consult ADI Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
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/.
Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
2
37411fg
For more information
www.linear.com/LT3741
LT3741/LT3741-1
ELECTRICAL CHARACTERISTICS
PARAMETER
Input Voltage Range
V
IN
Pin Quiescent Current (Note 2)
Non-Switching Operation
Shutdown Mode
EN/UVLO Pin Falling Threshold
EN/UVLO Hysteresis
EN/UVLO Pin Current
SYNC Pin Threshold
CTRL1 Pin Control Range
CTRL1 Pin Current
Reference
Reference Voltage (V
REF
Pin)
Inductor Current Sensing
Full Range SENSE
+
to SENSE
–
SENSE
+
Pin Current
SENSE
–
Pin Current
Internal V
CC
Regulator (V
CC_INT
Pin)
Regulation Voltage
NMOS FET Driver
Non-Overlap time HG to LG
Non-Overlap time LG to HG
Minimum On-Time LG
Minimum On-Time HG
Minimum Off-Time LG
High Side Driver Switch On-Resistance
Gate Pull Up
Gate Pull Down
Low Side Driver Switch On-Resistance
Gate Pull Up
Gate Pull Down
Switching Frequency
f
SW
Soft-Start
Charging Current
Voltage Regulation Amplifier
Input Bias Current
g
m
Feedback Regulation Voltage
CTRL1 = 1.5V, I
SENSE–
= 23µA, V
SENSE+
= 2V
l
l
l
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/UVLO
= 5V, V
SYNC
= 0V unless otherwise noted.
CONDITIONS
l
MIN
6
TYP
MAX
36
UNITS
V
mA
µA
V
mV
µA
V
Not Switching
V
EN/UVLO
= 0V, R
T
= 40kΩ
l
1.8
0.1
1.49
1.55
130
5.5
1
0
2.5
1
1.61
V
IN
= 6V, EN/UVLO = 1.45V
1.5
–100
V
nA
CTRL1 = 1.5V
1.94
48
2
51
50
10
2.06
54
V
mV
nA
µA
V
CTRL1
= 1.5V
V
SENSE
+
= 6V
l
With V
OUT
~ 4V, V
CTRL1
= 0V, V
SENSE–
= 6V
4.7
5
100
60
50
80
65
2.3
1.3
2.3
1
5.2
V
ns
ns
ns
ns
ns
Ω
Ω
Ω
Ω
(Note 3)
(Note 3)
(Note 3)
(Note 3)
(Note 3)
V
CBOOT
– V
SW
= 5V
V
CC_INT
= 5V
R
T
= 40kΩ
R
T
= 200kΩ
l
900
185
1000
200
11
1070
233
kHz
kHz
µA
nA
µA/V
FB = 1.3V
1.192
850
800
1.21
1.228
V
37411fg
For more information
www.linear.com/LT3741
3
LT3741/LT3741-1
ELECTRICAL CHARACTERISTICS
PARAMETER
Current Control Loop g
m
Amp
Offset Voltage
Input Common Mode Range
V
CM(LOW)
V
CM(HIGH)
Output Impedance
g
m
Differential Gain
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 LT3741E is guaranteed to meet performance specifications
from 0°C to 125°C junction temperature. Specifications over the –40°C
375
V
CM
=4V
V
CM(HIGH)
Measured from V
IN
to V
CM
l
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/UVLO
= 5V, V
SYNC
= 0V unless otherwise noted.
CONDITIONS
MIN
–3
TYP
0
0
2
3.5
475
1.7
625
MAX
3
UNITS
mV
V
V
MΩ
µA/V
V/mV
to 125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LT3741I is guaranteed to meet performance specifications over the –40°C
to 125°C operating junction temperature range.
Note 3:
The minimum on, off, and nonoverlap times are guaranteed by
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