Datasheet
LT3742
2
3742fa
absoluTe MaxiMuM raTings
V
IN
Voltage ................................................................ 30V
UVLO Voltage ............................................................30V
PG1, PG2 Voltage ...................................................... 30V
SWB, BIAS Voltage ...................................................40V
SENSE1
+
, SENSE2
+
Voltage ......................................30V
SENSE1
–
, SENSE2
–
Voltage ......................................30V
RUN/SS1, RUN/SS2 Voltage .......................................6V
FB1, FB2 Voltage .........................................................6V
V
C1
, V
C2
Voltage .......................................................... 6V
Junction Temperature ........................................... 125°C
Operating Junction Temperature Range
(Note 2) .................................................. –40°C to 125°C
Storage Temperature Range .................. –65°C to 125°C
(Note 1)
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 5V unless otherwise specified.
pin conFiguraTion
24 23 22 21 20 19
7 8 9
TOP VIEW
25
UF PACKAGE
24-LEAD (4mm × 4mm) PLASTIC QFN
10 11 12
6
5
4
3
2
1
13
14
15
16
17
18G1
V
IN
UVLO
BIAS
SWB
G2
V
C1
PG1
RUN/SS1
RUN/SS2
PG2
V
C2
SW1
NC
NC
SENSE1
+
SENSE1
–
FB1
SW2
NC
NC
SENSE2
+
SENSE2
–
FB2
T
JMAX
= 125°C, θ
JA
= 36°C/W
EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB
orDer inForMaTion
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3742EUF#PBF LT3742EUF#TRPBF 3742 24-Lead (4mm × 4mm) Plastic QFN –40°C to 125°C (Note 2)
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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/
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Operating Input Voltage V
UVLO
= 1.5V
l
3.5 4.0 V
Quiescent Current V
RUN/SS1
= V
RUN/SS2
= V
FB1
= V
FB2
= 1V 5.0 7.0 mA
Shutdown Current V
RUN/SS1
= V
RUN/SS2
= 0V 20 35 µA
UVLO Pin Threshold UVLO Pin Voltage Rising
l
1.20 1.25 1.28 V
UVLO Pin Hysteresis Current V
UVLO
= 1V, Current Flows Into Pin 1.8 3 4 µA
RUN/SS Pin Threshold 0.2 0.5 V
RUN/SS Pin Charge Current V
RUN/SS
= 0V 0.5 1 1.5 µA
FB Pin Voltage
l
0.788 0.800 0.812 V
FB Pin Voltage Line Regulation V
IN
= 5V to 30V 0.01 %/V