LT3507E, LT3507I.............................. –40°C to 125°C
LT3507H ............................................ –40°C to 150°C
Storage Temperature Range .................. –65°C to 150°C
(Note 1)
pin conFiGuration
BOOST3
31 V
IN2
30 V
IN2
29 SW2
28 SW2
27 BOOST2
39
26 TRK/SS4
25 FB4
24 DRIVE
23 V
C2
22 FB2
21 TRK/SS2
20 FB3
13 14 15 16 17 18 19
R
T
/SYNC
BIAS
TRK/SS3
RUN1
RUN2
RUN3
V
C3
TOP VIEW
SW1
SW1
SW3
SW3
V
IN3
V
IN3
38 37 36 35 34 33 32
BOOST1 1
V
IN1
2
V
IN1
3
V
INSW
4
OVLO 5
UVLO 6
V
C1
7
TRK/SS1 8
FB1 9
PGOOD1 10
PGOOD2 11
PGOOD3 12
UHF PACKAGE
38-LEAD (5mm
×
7mm) PLASTIC QFN
θ
JA
= 34°C/W
EXPOSED PAD (PIN 39) IS GND, MUST BE SOLDERED TO PCB
orDer inForMation
LEAD FREE FINISH
LT3507EUHF#PBF
LT3507IUHF#PBF
LT3507HUHF#PBF
TAPE AND REEL
LT3507EUHF#TRPBF
LT3507IUHF#TRPBF
LT3507HUHF#TRPBF
PART MARKING*
3507
3507
3507
PACKAGE DESCRIPTION
38-Lead (5mm
×
7mm) Plastic QFN
38-Lead (5mm
×
7mm) Plastic QFN
38-Lead (5mm
×
7mm) Plastic QFN
TEMPERATURE RANGE
–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.
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/.
Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN1
, V
IN2
, V
IN3
= 12V, V
BOOST1
, V
BOOST2
, V
BOOST3
= 17V, unless
otherwise noted. (Note 2)
PARAMETER
Minimum Operating Voltage
Input Quiescent Current
Bias Quiescent Current
Shutdown Current
Reference Voltage Line Regulation
CONDITIONS
Internal UVLO on V
IN1
Not Switching, V
BIAS
= 3.3V
Not Switching, V
BIAS
= 3.3V
V
RUN1,2,3
= 0V
5V < V
IN1
< 36V
0.01
l
electrical characteristics
MIN
TYP
3.8
2
5
MAX
4
3.5
7.5
1
UNITS
V
mA
mA
µA
%/V
3507fb
2
For more information
www.linear.com/LT3507
LT3507
electrical characteristics
PARAMETER
V
C
Source Current
V
C
Sink Current
V
C
Clamp Voltage
Switching Frequency
Switching Phase
Foldback Frequency
Frequency Shift Threshold on FB
RUN Threshold
PGOOD Output Voltage Low
PGOOD Pin Leakage
PGOOD Threshold Offset
Feedback Pin Voltage
Feedback Pin Bias Current
Error Amplifier Transconductance
Error Amplifier Voltage Gain
V
C
Switching Threshold
Switch Leakage Current
Minimum Boost Voltage Above Switch (Note 4)
Converter 1
V
C1
to Switch Current Gain
Switch 1 Current Limit (Note 3)
Switch 1 V
CESAT
BOOST1 Operating Current
Converter 2
V
C2
to Switch Current Gain
Switch 2 Current Limit (Note 3)
Switch 2 V
CESAT
BOOST2 Operating Current
Converter 3
V
C3
to Switch Current Gain
Switch 3 Current Limit (Note 3)
Switch 3 V
CESAT
BOOST3 Operating Current
LDO Regulator
Feedback Pin Voltage
Feedback Pin Bias Current
Error Amplifier Voltage Gain
Line Regulation
V
IN
from 5V to 36V
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN1
, V
IN2
, V
IN3
= 12V, V
BOOST1
, V
BOOST2
, V
BOOST3
= 17V, unless
otherwise noted. (Note 2)
CONDITIONS
V
C
= 0.6V
V
C
= 0.6V
R
T
= 40.2k
SW1 to SW2,3, R
T
= 40.2k
V
FB
= 0V, R
T
= 40.2k
l
MIN
TYP
20
30
1.7
MAX
UNITS
µA
µA
V
0.9
180
120
0.4
1
1.1
MHz
Deg
kHz
V
1.5
0.4
400
105
812
–500
V
V
nA
mV
mV
nA
µS
V/V
V
I
PGOOD
= 200µA
V
PGOOD
= 2V
V
FB
Rising
l
l
0.2
10
58
788
80
800
–50
330
500
0.9
0.01
1.8
5
10
2.5
µA
V
A/V
Duty Cycle = 15%
I
SW1
= 2A
I
SW1
= 2A
l
3
4.3
400
40
3.6
6
600
60
A
mV
mA
A/V
Duty Cycle = 15%
I
SW2
= 1.5A
I
SW2
= 1.5A
l
2
2.9
350
40
3.6
4
500
60
A
mV
mA
A/V
Duty Cycle = 15%
I
SW3
= 1.5A
I
SW3
= 1.5A
l
2
2.9
350
40
4
500
60
812
–500
A
mV
mA
mV
nA
V/V
%/V
3507fb
788
800
–150
1100
0.05
For more information
www.linear.com/LT3507
3
LT3507
electrical characteristics
PARAMETER
Load Regulation
DRIVE Output Current Limit
Dropout Voltage, V
IN1
to DRIVE
Dropout Voltage, BIAS to DRIVE
Over/Undervoltage Lockout
Undervoltage Lockout Threshold
Overvoltage Lockout Threshold
Undervoltage Lockout Hysteresis Current
Overvoltage Lockout Hysteresis Current
Input Bias Current (OVLO and UVLO)
V(UVLO) < 1.2V
V(OVLO) > 1.2V
V(OVLO) = 1.0V, V(UVLO) = 1.5V
1.15
1.15
7
–7
1.20
1.20
10
–10
–100
1.25
1.25
13
–13
–200
V
V
µA
µA
nA
I
DRIVE
= 10mA, V
IN1
= 5V
I
DRIVE
= 10mA, V
IN1
= 5V
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN1
, V
IN2
, V
IN3
= 12V, V
BOOST1
, V
BOOST2
, V
BOOST3
= 17V, unless
otherwise noted (Note 2)
CONDITIONS
I
DRIVE
from 0.1mA to 10mA
l
MIN
10
TYP
0.005
15
1.7
0.5
MAX
22.5
2.0
0.8
UNITS
%/mA
mA
V
V
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 LT3507E 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
LT3507I is guaranteed to meet performance specifications from –40°C
to 125°C junction temperature. The LT3507H is guaranteed over the full
–40°C to 150°C operating junction temperature range. High junction
temperatures degrade operating lifetimes. Operating lifetime is derated at
junction temperatures greater than 125°C.
Note 3:
Current limit is guaranteed by design and/or correlation to static
test. Slope compensation reduces current limit at higher duty cycles.
Note 4:
This is the minimum voltage across the boost capacitor needed to
guarantee full saturation of the internal power switch.
Note 5:
This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions.
Junction temperature will exceed the maximum operating range when
overtemperature protection is active. Continuous operation above the
specified maximum operating junction temperature may impair device
reliability.
Note 6:
Positive currents flow into pins, negative currents flow out of pins.
Minimum and maximum specifications refer to absolute values.
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