Datasheet

LT3504
2
3504fa
For more information www.linear.com/LT3504
pin conFiguraTionabsoluTe MaxiMuM raTings
EN/UVLO Pin .............................................................40V
EN/UVLO Pin Above V
IN
Pin ........................................5V
V
IN
Pin ......................................................................40V
SKY Pin ..................................................................... 46V
SW5 Pin ....................................................................47V
RUN/SS Pins ...............................................................6V
FB Pins ........................................................................6V
RT/SYNC Pin ...............................................................6V
PG Pin ....................................................................... 25V
Operating Junction Temperature Range (Notes 2, 8)
LT3504EUFD .......................................... –40°C to 125°C
LT3504IUFD ........................................... –40°C to 125°C
Storage Temperature Range .................. –65°C to 150°C
(Note 1)
9 10
TOP VIEW
UFD PACKAGE
28-LEAD (4mm × 5mm) PLASTIC QFN
29
GND
11 12 13
28 27 26 25 24
14
23
6
5
4
3
2
1
DA2
SW2
DA3
SW3
SW1
DA1
SW4
DA4
FB2
FB3
FB1
FB4
GND
RT/SYNC
EN/UVLO
RUN/SS3
V
IN
GND V
IN
SKY SW5 PG
V
IN
GND
V
IN
RUN/SS4 RUN/SS1 RUN/SS2
7
17
18
19
20
21
22
16
8
15
θ
JA
= 43°C/W
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
orDer inForMaTion
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3504EUFD#PBF LT3504EUFD#TRPBF 3504
28-Lead (4mm × 5mm) Plastic QFN
–40°C to 125°C
LT3504IUFD#PBF LT3504IUFD#TRPBF 3504
28-Lead (4mm × 5mm) Plastic QFN
–40°C to 125°C
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/
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
= 12V unless otherwise noted.
SYMBOL CONDITIONS MIN TYP MAX UNITS
EN/UVLO Threshold Voltage Rising
l
1.2 1.44 1.6 V
EN/UVLO Threshold Voltage Hysteresis 110 mV
EN/UVLO Threshold Current Hysteresis V
EN/UVLO
= Measured Rising Threshold – 50mV
(Note 3)
1.3 µA
Internal V
IN
Undervoltage Lockout 2.4 2.9 3.2 V
Quiescent Current (V
IN
) in Shutdown V
EN/UVLO
= 0V 0.01 2 µA
Quiescent Current (V
IN
) V
EN/UVLO
= 1V (Note 4) 4 10 µA
Quiescent Current (V
IN
) V
EN/UVLO
= 1.5V, V
RUN/SS(1,2,3,4)
= Open,
V
FB(1,2,3,4)
= 0.9V, V
SKY
= 17V
2.7 mA
Quiescent Current (SKY) V
EN/UVLO
= 1.5V, V
RUN/SS(1,2,3,4)
= Open,
V
FB(1,2,3,4)
= 0.9V, V
SKY
= 17V
4.4 mA