LT3581E (Notes 2, 4) ......................... –40°C to 125°C
LT3581I (Notes 2, 4) .......................... –40°C to 125°C
LT3581H (Notes 2, 4)......................... –40°C to 150°C
Storage Temperature Range .................. –65°C to 150°C
PIN CONFIGURATION
TOP VIEW
FB
V
C
GATE
FAULT
V
IN
SW1
SW1
1
2
3
4
5
6
7
15
GND
14 SYNC
13 SS
12 RT
11
SHDN
10 CLKOUT
9 SW2
8 SW2
TOP VIEW
FB
V
C
GATE
FAULT
V
IN
SW1
SW1
SW1
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
SYNC
SS
RT
SHDN
CLKOUT
SW2
SW2
SW2
17
GND
DE14 PACKAGE
14-PIN (4mm
×
3mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 43°C/W,
θ
JC
= 4.3°C/W
EXPOSED PAD (PIN 15) IS GND, MUST BE SOLDERED TO PCB
MSE PACKAGE
16-LEAD PLASTIC MSOP
T
JMAX
= 125°C,
θ
JA
= 45°C/W,
θ
JC
= 10°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LT3581EDE#PBF
LT3581IDE#PBF
LT3581HDE#PBF
LT3581EMSE#PBF
LT3581IMSE#PBF
TAPE AND REEL
LT3581EDE#TRPBF
LT3581IDE#TRPBF
LT3581HDE#TRPBF
LT3581EMSE#TRPBF
LT3581IMSE#TRPBF
PART MARKING*
3581
3581
3581
3581
3581
PACKAGE DESCRIPTION
14-Lead (4mm
×
3mm) Plastic DFN
14-Lead (4mm
×
3mm) Plastic DFN
14-Lead (4mm
×
3mm) Plastic DFN
16-Lead Plastic MSOP
16-Lead Plastic MSOP
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 150°C
–40°C to 125°C
–40°C to 125°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/
3581fb
2
For more information
www.linear.com/LT3581
LT3581
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 5V, V
SHDN
= V
IN
, V
FAULT
= V
IN
, unless otherwise noted. (Note 2).
PARAMETER
Minimum Input Voltage
V
IN
Overvoltage Lockout
Positive Feedback Voltage
Negative Feedback Voltage
Positive FB Pin Bias Current
Negative FB Pin Bias Current
Error Amp Transconductance
Error Amp Voltage Gain
Quiescent Current
Quiescent Current in Shutdown
Reference Line Regulation
Switching Frequency, f
OSC
Switching Frequency in Foldback
Switching Frequency Range
SYNC High Level for Synchronization
SYNC Low Level for Synchronization
SYNC Clock Pulse Duty Cycle
Recommended Minimum SYNC Ratio
f
SYNC
/f
OSC
Minimum Off-Time
Minimum On-Time
SW1 Current Limit
Current Sharing (SW2/SW1)
SW1 + SW2 Current Limit
Switch V
CESAT
SW1 Leakage Current
SW2 Leakage Current
At All Duty Cycles, SW2/SW1 = 78% (Note 3)
SW1 & SW2 Tied Together, I
SW1
+ I
SW2
= 2.75A
V
SW1
= 5V
V
SW2
= 5V
l
l
l
ELECTRICAL CHARACTERISTICS
CONDITIONS
MIN
l
TYP
2.3
23.5
1.215
9
83.3
83.3
270
70
1.9
0
0.01
MAX
2.5
25
1.230
16
85
85.5
UNITS
V
V
V
mV
µA
µA
µmhos
V/V
22.1
1.195
3
81
81
V
FB
= Positive Feedback Voltage, Current into Pin
V
FB
= Negative Feedback Voltage, Current out of Pin
ΔI = 10μA
Not Switching
V
SHDN
= 0V
2.5V ≤ V
IN
≤ 20V
R
T
= 34k
R
T
= 432k
Compared to Normal f
OSC
Free-Running or Synchronizing
l
l
2.3
1
0.05
2.75
220
2500
0.4
mA
µA
%/V
MHz
kHz
ratio
kHz
V
V
%
l
l
2.25
180
200
1.3
20
2.5
200
1/6
l
l
l
V
SYNC
= 0V to 2V
80
3/4
45
55
ns
ns
3
5.4
1
1
A
%
A
mV
µA
µA
At All Duty Cycles
l
1.9
3.3
2.4
78
4.3
250
0.01
0.01
3581fb
For more information
www.linear.com/LT3581
3
LT3581
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 5V, V
SHDN
= V
IN
, V
FAULT
= V
IN
, unless otherwise noted. (Note 2).
PARAMETER
Soft-Start Charge Current
Soft-Start Discharge Current
Soft-Start High Detection Voltage
Soft-Start Low Detection Voltage
SHDN
Minimum Input Voltage High
CONDITIONS
V
SS
= 30mV, Current Flows Out of SS pin
Part in FAULT, V
SS
= 2.1V, Current Flows into SS Pin
Part in FAULT
Part Exiting FAULT
Active Mode,
SHDN
Rising (LT3581E, LT3581I)
Active Mode,
SHDN
Rising (LT3581H)
Active Mode,
SHDN
Falling (LT3581E, LT3581I, LT3581H)
Shutdown Mode
V
SHDN
= 3V
V
SHDN
= 1.3V
V
SHDN
= 0V
C
CLKOUT
= 50pF
C
CLKOUT
= 50pF
T
J
= 25°C
C
CLKOUT
= 50pF
C
CLKOUT
= 50pF
V
GATE
= 3V (LT3581E, LT3581I)
V
GATE
= 3V (LT3581H)
V
GATE
= 80V (LT3581E, LT3581I, LT3581H)
V
GATE
= 50V, GATE Off
50μA into
FAULT
Pin (LT3581E, LT3581I)
50μA into
FAULT
Pin (LT3581H)
V
FAULT
= 40V,
FAULT
Off
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
ELECTRICAL CHARACTERISTICS
MIN
5.7
5.7
1.65
30
1.27
1.27
1.24
TYP
8.7
8.7
1.8
50
1.33
1.33
1.3
40
11.4
0
2.1
5
42
12
8
MAX
11.3
11.3
1.95
85
1.41
1.44
1.38
0.3
60
13.4
0.1
2.3
200
UNITS
µA
µA
V
mV
V
V
V
V
µA
µA
µA
V
mV
%
ns
ns
SHDN
Input Voltage Low
SHDN
Pin Bias Current
9.7
1.9
CLKOUT Output Voltage High
CLKOUT Output Voltage Low
CLKOUT Duty Cycle
CLKOUT Rise Time
CLKOUT Fall Time
GATE Pull Down Current
800
700
800
933
900
933
0.01
100
100
0.01
1100
1100
1100
1
300
400
1
800
1050
µA
µA
µA
µA
mV
mV
µA
mV
mV
GATE Leakage Current
FAULT
Output Voltage Low
FAULT
Leakage Current
FAULT
Input Voltage Low
FAULT
Input Voltage High
700
950
750
1000
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 LT3581E is guaranteed to meet performance specifications
from 0°C to 125°C. Specifications over the –40°C to 125°C junction
temperature range are assured by design, characterization and correlation
with statistical process controls. The LT3581I is guaranteed over the full
–40°C to 125°C operating junction temperature range. The LT3581H is
guaranteed over the full –40°C to 150°C operating junction temperature
range. Operating lifetime is derated at junction temperatures greater than
125°C.
Note 3:
Current limit guaranteed by design and/or correlation to static test.
Note 4:
This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 150°C when overtemperature protection is active.
Continuous operation over the specified maximum operating junction
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