Datasheet
LT3514
3
3514fa
For more information www.linear.com/LT3514
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 4 10 µA
Quiescent Current (V
IN
) V
EN/UVLO
= 1.5V, V
RUN/SS(1,3,4)
= Open,
V
FB(1,3,4)
= 0.9V, V
SKY
= 17V (Note 4)
2.7 mA
Quiescent Current (SKY) V
EN/UVLO
= 1.5V, V
RUN/SS(1,3,4)
= Open,
V
FB(1,3,4)
= 0.9V, V
SKY
= 17V (Note 4)
4.4 mA
RUN/SS Pin Source Current V
RUN/SS
= 0V 1.3 µA
RUN/SS Pin Threshold for Switching V
FB
= 0V 50 100 mV
Feedback Voltage
l
790
784
800
800
810
816
mV
mV
FB Pin Current V
FB
= Measured V
FB
(Note 5)
l
15 150 nA
Reference Line Regulation V
IN
= 5V to 40V –0.015 %/V
SKY Pin Current I
SW1
= 1A or I
SW4
= 1A 27 40 mA
SKY Pin Current I
SW3
= 2A 54 80 mA
SKY Voltage above V
IN
Voltage V
SKY
– V
IN
4.85 V
Switching Frequency R
T
= 6.34k
R
T
= 18.2k
R
T
= 100k
l
l
l
1.8
0.85
220
2.1
1
270
2.4
1.15
320
MHz
MHz
kHz
Switching Phase R
T
= 18.2k 150 180 210 Deg
SYNC Threshold Voltage 1.25 V
SYNC Input Frequency 0.35 2.2 MHz
Switch Current Limit (SW1,4) (Note 6) 1.45 1.75 2.1 A
Switch V
CESAT
(SW1,4) I
SW1, SW4
= 1A 400 mV
Switch Leakage Current (SW1,4) 0.1 2 µA
Catch Diode Current Limit (SW1,4) FB = 0V
FB = 0.7V
0.75
1.0
1.15
1.45
1.33
1.67
A
A
Switch Current Limit (SW3) (Note 6) 3 3.5 4.2 A
Switch V
CESAT
(SW3) I
SW3
= 2A 400 mV
Switch Leakage Current (SW3) 0.1 4 µA
Catch Diode Current Limit (SW3) FB = 0V
FB = 0.7V
1.5
2.0
2
2.5
2.4
3.0
A
A
Switch Current Limit (SW5) (Note 6) 220 320 mA
Switch V
CESAT
(SW5) I
SW
= 200mA 230 mV
Switch Leakage Current (SW5) 0.1 2 µA
Boost Diode Current Limit (SW5) V
IN
= 5V 350 450 mA
PG Threshold Offset V
FB
Rising 65 90 125 mV
PG Hysteresis V
FB
Rising – V
FB
Falling 35 mV