LT3514EUFD ...................................... –40°C to 125°C
LT3514IUFD ....................................... –40°C to 125°C
LT3514EFE ......................................... –40°C to 125°C
LT3514IFE .......................................... –40°C to 125°C
LT3514HFE......................................... –40°C to 150°C
Storage Temperature Range .................. –65°C to 150°C
PIN CONFIGURATION
TOP VIEW
SW5
GND
SKY
V
IN
V
IN
V
IN
NC
22 NC
21 FB3
20 FB1
29
GND
19 FB4
18 GND
17 RT/SYNC
16 EN/UVLO
15 RUN/SS3
9 10 11 12 13 14
GND
RUN/SS4
RUN/SS1
V
IN
V
IN
NC
DA3
SW3
SW3
SW1
DA1
SW4
DA4
1
2
3
4
5
6
7
8
9
25
GND
TOP VIEW
PG
24 SKY
23 SW5
22 GND
21 PG
20 FB3
19 FB1
18 FB4
17 RT/SYNC
16 EN/UVLO
15 RUN/SS3
14 RUN/SS1
13 RUN/SS4
28 27 26 25 24 23
NC 1
NC 2
DA3 3
SW3 4
SW1 5
DA1 6
SW4 7
DA4 8
NC 10
V
IN
11
V
IN
12
UFD PACKAGE
28-LEAD (4mm
×
5mm) PLASTIC QFN
θ
JA
= 43°C/W
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
FE PACKAGE
24-LEAD PLASTIC TSSOP
θ
JA
= 33°C/W
EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LT3514EUFD#PBF
LT3514IUFD#PBF
LT3514EFE#PBF
LT3514IFE#PBF
LT3514HFE#PBF
TAPE AND REEL
LT3514EUFD#TRPBF
LT3514IUFD#TRPBF
LT3514EFE#TRPBF
LT3514IFE#TRPBF
LT3514HFE#TRPBF
PART MARKING*
3514
3514
LT3514FE
LT3514FE
LT3514FE
PACKAGE DESCRIPTION
28-Lead (4mm
×
5mm) Plastic QFN
28-Lead (4mm
×
5mm) Plastic QFN
24-Lead Plastic TSSOP
24-Lead Plastic TSSOP
24-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
–40°C to 150°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/
3514fa
2
For more information
www.linear.com/LT3514
LT3514
ELECTRICAL CHARACTERISTICS
SYMBOL
EN/UVLO Threshold Voltage
EN/UVLO Threshold Voltage Hysteresis
EN/UVLO Threshold Current Hysteresis
Internal V
IN
Undervoltage Lockout
Quiescent Current (V
IN
) in Shutdown
Quiescent Current (V
IN
)
Quiescent Current (V
IN
)
Quiescent Current (SKY)
RUN/SS Pin Source Current
RUN/SS Pin Threshold for Switching
Feedback Voltage
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 unless otherwise noted.
CONDITIONS
Rising
V
EN/UVLO
= Measured Rising Threshold – 50mV
(Note 3)
2.4
V
EN/UVLO
= 0V
V
EN/UVLO
= 1V
V
EN/UVLO
= 1.5V, V
RUN/SS(1,3,4)
= Open,
V
FB(1,3,4)
= 0.9V, V
SKY
= 17V (Note 4)
V
EN/UVLO
= 1.5V, V
RUN/SS(1,3,4)
= Open,
V
FB(1,3,4)
= 0.9V, V
SKY
= 17V (Note 4)
V
RUN/SS
= 0V
V
FB
= 0V
50
790
784
l
MIN
1.2
TYP
1.44
110
1.3
2.9
0.01
4
2.7
4.4
1.3
100
800
800
15
–0.015
27
54
4.85
MAX
1.6
UNITS
V
mV
µA
3.2
2
10
V
µA
µA
mA
mA
µA
mV
810
816
150
40
80
2.4
1.15
320
210
2.2
mV
mV
nA
%/V
mA
mA
V
MHz
MHz
kHz
Deg
V
MHz
A
mV
µA
A
A
A
mV
µA
A
A
mA
mV
FB Pin Current
Reference Line Regulation
SKY Pin Current
SKY Pin Current
SKY Voltage above V
IN
Voltage
Switching Frequency
V
FB
= Measured V
FB
(Note 5)
V
IN
= 5V to 40V
I
SW1
= 1A or I
SW4
= 1A
I
SW3
= 2A
V
SKY
– V
IN
R
T
= 6.34k
R
T
= 18.2k
R
T
= 100k
R
T
= 18.2k
l
l
l
l
1.8
0.85
220
150
0.35
2.1
1
270
180
1.25
Switching Phase
SYNC Threshold Voltage
SYNC Input Frequency
Switch Current Limit (SW1,4)
Switch V
CESAT
(SW1,4)
Switch Leakage Current (SW1,4)
Catch Diode Current Limit (SW1,4)
Switch Current Limit (SW3)
Switch V
CESAT
(SW3)
Switch Leakage Current (SW3)
Catch Diode Current Limit (SW3)
Switch Current Limit (SW5)
Switch V
CESAT
(SW5)
Switch Leakage Current (SW5)
Boost Diode Current Limit (SW5)
PG Threshold Offset
PG Hysteresis
(Note 6)
I
SW1, SW4
= 1A
FB = 0V
FB = 0.7V
(Note 6)
I
SW3
= 2A
FB = 0V
FB = 0.7V
(Note 6)
I
SW
= 200mA
V
IN
= 5V
V
FB
Rising
V
FB
Rising – V
FB
Falling
1.45
1.75
400
0.1
2.1
2
1.33
1.67
4.2
4
2.4
3.0
0.75
1.0
3
1.15
1.45
3.5
400
0.1
1.5
2.0
220
2
2.5
320
230
0.1
2
125
µA
mA
mV
mV
350
65
450
90
35
3514fa
For more information
www.linear.com/LT3514
3
LT3514
ELECTRICAL CHARACTERISTICS
SYMBOL
PG Voltage Output Low
PG Pin Leakage
I
PG
= 250µA
V
PG
= 2V
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.
CONDITIONS
MIN
TYP
180
0.01
MAX
300
1
UNITS
mV
µA
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 LT3514E 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
LT3514I is guaranteed over the full –40°C to 125°C operating junction
temperature range.
Note 3:
Current flows into pin.
Note 4:
The V
IN
pin quiescent current and the SKY pin quiescent current
are specified in the Electrical Characteristics table. However, the quiescent
current for an application circuit is higher than the sum of these two
currents because the SKY voltage is higher than V
IN
, and there are power
losses in the boost regulator. See the Typical Performance Characteristics
section for a plot of input quiescent current vs input voltage for a typical
application.
Note 5:
Current flows out of pin.
Note 6:
Current limit is guaranteed by design and/or correlation to static
test. Slope compensation reduces current limit at higher duty cycles.
Note 7:
This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
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