Datasheet

2
LT3503
3503f
Input Voltage (V
IN
) .................................................. 20V
BOOST Pin Voltage .................................................. 40V
BOOST Pin Above SW Pin ....................................... 20V
SHDN Pin ................................................................ 20V
FB Voltage ................................................................. 6V
Operating Temperature Range (Note 2) ... –40°C to 85°C
Maximum Junction Temperature .......................... 125°C
Storage Temperature Range ................. – 65°C to 150°C
ORDER PART NUMBER
DCB PART MARKING
LT3503EDCB
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
(Note 1)
T
JMAX
= 125°C, θ
JA
= 64°C/ W
EXPOSED PAD (PIN 7) IS GND, MUST BE SOLDERED TO PCB
Order Options Tape and Reel: Add #TR Lead Free: Add #PBF
Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Operating Range 3.6 20 V
Undervoltage Lockout 3.0 3.4 3.6 V
Feedback Voltage ● 765 780 795 mV
FB Pin Bias Current V
FB
= Measured V
REF
(Note 4) ● 50 150 nA
Quiescent Current Not Switching 1.9 2.6 mA
Quiescent Current in Shutdown V
SHDN
= 0V 0.01 2 µA
Reference Line Regulation V
IN
= 5V to 20V 0.007 %/V
Switching Frequency V
FB
= 0.7V 2.0 2.2 2.4 MHz
V
FB
= 0V 36 kHz
Maximum Duty Cycle ● 76 81 %
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
V
IN
= 12V, V
BOOST
= 17V, unless otherwise noted. (Note 2)
ELECTRICAL CHARACTERISTICS
Consult LTC Marketing for parts specified with wider operating temperature ranges.
LCGW
TOP VIEW
SHDN
V
IN
SW
FB
GND
BOOST
DCB PACKAGE
6-LEAD (2mm 3mm) PLASTIC DFN
4
5
7
6
3
2
1