EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
SENSE
VCH
FE PACKAGE
28-LEAD PLASTIC TSSOP
T
JMAX
= 125°C,
θ
JA
= 30°C/W
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LT3743EUFD#PBF
LT3743IUFD#PBF
LT3743EFE#PBF
LT3743IFE#PBF
TAPE AND REEL
LT3743EUFD#TRPBF
LT3743IUFD#TRPBF
LT3743EFE#TRPBF
LT3743IFE#TRPBF
PART MARKING*
3743
3743
LT3743FE
LT3743FE
PACKAGE DESCRIPTION
28-Lead (4mm
×
5mm) Plastic QFN
28-Lead (4mm
×
5mm) Plastic QFN
28-Lead Plastic TSSOP
28-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
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/
3743f
2
LT3743
ELECTRICAL CHARACTERISTICS
PARAMETER
Input Voltage Range
V
IN
Pin Quiescent Current (Note 3)
Non-Switching Operation
Shutdown Mode
EN/UVLO Pin Falling Threshold
EN/UVLO Hysteresis
EN/UVLO Pin Current
PWM Pin Threshold
CTRL_SEL Threshold
SYNC Pin Threshold
CTRL_H and CTRL_L Pin Control Range
CTRL_H and CTRL_L 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 (Note 2)
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
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, unless otherwise noted.
CONDITIONS
(Note 2)
V
PWM
= V
CTRL_SEL
= 0V, Not Switching
V
EN/UVLO
= 0V
MIN
6
1.8
0.1
1.49
V
IN
= 6V, EN/UVLO = 1.45V
1.55
130
5.5
1.0
1.0
1.0
0
100
With a 67kΩ Resistor from V
REF
to GND
V
CTRL_H
or V
CTRL_L
= 1.5V
With V
OUT
~ 4V
4.7
l
l
TYP
MAX
36
2.5
1
1.61
UNITS
V
mA
μA
V
mV
μA
V
V
V
l
1.5
V
nA
1.96
48
2
51
50
10
5
100
60
2.04
54
V
mV
nA
μA
5.2
V
ns
ns
ns
ns
ns
Ω
Ω
Ω
Ω
(Note 4)
(Note 4)
(Note 4)
V
CBOOT
– V
SW
= 5V
50
200
60
2.3
1.3
V
CC_INT
= 5V
2.5
1.3
R
T
= 40kΩ
R
T
= 200kΩ
l
930
200
1000
218
5.5
1
200
1070
233
kHz
kHz
μA
nA
μA/V
0.945
0.99
1.025
V
3743f
3
LT3743
ELECTRICAL CHARACTERISTICS
PARAMETER
PWMG Control Signals
CTRL_SEL High to PWMGL Low Delay
CTRL_SEL High to PWMGH High Delay
CTRL_SEL Low to PWMGH Low Delay
CTRL_SEL Low to PWMGL High Delay
PWMGH and PWMGL Pull-up Impedance
PWMGH and PWMGL Pull-Down Impedance
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 LT3743 will function with a supply voltage as low as 4.5V, but
to keep the gate drive voltages above 4V, the V
CC_INT
pin must be tied to
V
IN
for operation below 6.0V
375
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, unless otherwise noted.
CONDITIONS
MIN
TYP
10
150
30
170
3.2
1.75
–2.75
0
0
2
3.5
475
1.7
625
2.75
MAX
40
200
60
220
UNITS
ns
ns
ns
ns
Ω
Ω
mV
V
V
MΩ
μA/V
mV/V
V
CM(HIGH)
Measured from V
IN
to V
CM
Note 3:
The LT3743E is guaranteed to meet performance specifications
from 0°C to 125°C junction temperature. Specifications over the –40°C
to 125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LT3743I is guaranteed to meet performance specifications over the –40°C
to 125°C operating junction temperature range.
Note 4:
The minimum on and off times are guaranteed by design and are
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