SYNC, RUN Pin .........................................................30V
Operating Junction Temperature
Range (Notes 2, 3) ................................. –40°C to 125°C
SS ........................................................... 300µA Max I
SS
SENSE1
+
, SENSE2
+
,
SENSE1
–
, SENSE2
–
..................................... –0.3V to 2V
Storage Temperature Range ..................– 65°C to 150°C
Lead Temperature (Soldering, 10 sec)
For FE Package ..................................................... 300°C
pin conFiguraTion
TOP VIEW
SGATE1
SGATE2
GBIAS
SGATE2
SGATE1
NC
GND
SYNC
DELAY
DCL
SENSE1
+
SENSE1
–
1
2
3
4
5
6
7
8
9
29
GND
28 GBIAS
27 V
CC
26 NC
25 NC
24 V
EE1
23 BGATE1
22 GBIAS1
21 GBIAS2
20 BGATE2
19 V
EE2
18 NC
17 RUN
16 FB
15 V
C
TOP VIEW
28 27 26 25 24 23
SYNC 1
DELAY 2
DCL 3
SENSE1
+
4
SENSE1
–
5
29
GND
SLOPE 6
R
SET
7
SENSE2
–
8
9 10 11 12 13 14
SLOPE 10
R
SET
11
SENSE2
–
12
SENSE2
+
13
SS 14
FB
FE PACKAGE
28-LEAD PLASTIC TSSOP
T
JMAX
= 125°C,
θ
JA
= 30°C/ W
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
UFD PACKAGE
28-LEAD (4mm
×
5mm) PLASTIC QFN
T
JMAX
= 125°C,
θ
JA
= 37°C/ W
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
orDer inForMaTion
LEAD FREE FINISH
LT3782AEFE#PBF
LT3782AIFE#PBF
LT3782AEUFD#PBF
LT3782AIUFD#PBF
LEAD BASED FINISH
LT3782AEFE
LT3782AIFE
LT3782AEUFD
LT3782AIUFD
TAPE AND REEL
LT3782AEFE#TRPBF
LT3782AIFE#TRPBF
LT3782AEUFD#TRPBF
LT3782AIUFD#TRPBF
TAPE AND REEL
LT3782AEFE#TR
LT3782AIFE#TR
LT3782AEUFD#TR
LT3782AIUFD#TR
PART MARKING*
LT3782AFE
LT3782AFE
3782A
3782A
PART MARKING*
LT3782AFE
LT3782AFE
3782A
3782A
PACKAGE DESCRIPTION
28-Lead Plastic TSSOP
28-Lead Plastic TSSOP
28-Lead (4mm
×
5mm) Plastic QFN
28-Lead (4mm
×
5mm) Plastic QFN
PACKAGE DESCRIPTION
28-Lead Plastic TSSOP
28-Lead Plastic TSSOP
28-Lead (4mm
×
5mm) Plastic QFN
28-Lead (4mm
×
5mm) Plastic QFN
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°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.
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/
SENSE2
RUN
NC
SS
+
V
C
V
EE1
22 BGATE1
21 GBIAS1
20 NC
19 NC
18 GBIAS2
17 BGATE2
16 V
EE2
15 NC
GND
V
CC
2
3782afc
For more information
www.linear.com/LT3782A
LT3782A
The
l
denotes the specifications which apply over the full operating junction
temperature range, otherwise specifications are at T
J
= 25°C. V
CC
= 13V, R
SET
= 80k, no load on any outputs, unless otherwise noted.
PARAMETER
Overall
Supply Voltage (V
CC
)
Supply Current (I
VCC
)
Shutdown
RUN Threshold
RUN Threshold Hysteresis
Supply Current in Shutdown
RUN Pin Input Current
Voltage Amplifier g
m
Reference Voltage (V
REF
)
l
l
l
elecTrical characTerisTics
CONDITIONS
MIN
6
TYP
MAX
40
UNITS
V
mA
V
mV
mA
µA
µA
V
V
µmho
µA
V
V
µA
µA
V
µA
V
C
≤ 0.5V (Switching Off), V
CC
≤ 40V
2.3
11
2.44
80
0.4
40
l
16
2.6
0.65
90
–2
2.464
2.488
370
0.6
0.4
14
28
15
1V ≤ RUN ≤ V
REF
RUN ≤ 0.3V, V
CC
≤ 30V
V
RUN
= 2.3V
–0.5
2.42
2.4
200
2.44
260
0.2
1.5
0.35
8
13
11
20
10
4
Transconductance
Input Current I
FB
V
C
High
V
C
Low
Source Current I
VC
Sink Current I
VC
V
C
Threshold for Switching Off (BGATE1, BGATE2 Low)
Soft-Start Current I
SS
Current Amplifier CA1, CA2
Voltage Gain ∆V
C
/∆V
SENSE
Current Limit (V
SENSE1+
– V
SENSE1–
) (V
SENSE2+
– V
SENSE2–
)
Current Limit Mismatch
Input Current (I
SENSE1+
, I
SENSE1–
, I
SENSE2+
, I
SENSE2–
)
Oscillator
Switching Frequency
V
VC
= 1V, ∆I
VC
= ±2µA
V
FB
= V
REF
I
VC
= 0
I
VC
= 0
V
VC
= 0.7V – 1V, V
FB
= V
REF
– 100mV
V
VC
= 0.7V – 1V, V
FB
= V
REF
+ 100mV
l
l
l
0.3
6
V
SS
= 0.1V – 2.8V
V
FB
= 2.3V
(∆V
SENSE1
– ∆V
SENSE2
), V
FB
= 2.3V
∆V
SENSE
= 0V
R
SET
= 130k
R
SET
= 80k
R
SET
= 40k
Rising Edge V
SYNC
R
SET
= 130k
R
SET
= 80k
R
SET
= 40k
R
SET
= 80k
V
FB
= V
REF
– 25mV, R
SET
> 80k
R
SET
= 40k
R
SET
= 80k, V
DCL
≤ 0.3V
V
DCL
= 1.2V
V
DCL
= V
RSET
V
DCL
≤ 0.3V
l
l
l
l
l
l
55
–10
63
60
70
10
mV
mV
µA
130
212
386
0.8
180
290
550
154
250
465
1.2
177
288
533
2
240
392
715
kHz
kHz
kHz
V
kHz
kHz
kHz
V
%
%
%
%
Synchronization Pulse Threshold on SYNC Pin
Synchronization Frequency Range
(Note: Operation Switching Frequency Equals
Half of the Synchronization Frequency)
V
RSET
Maximum Duty Cycle
Duty Cycle Limit
2.3
90
83
94
90
50
75
Max Duty Cycle
–0.1
–0.3
DCL Pin Input Current
µA
3782afc
For more information
www.linear.com/LT3782A
3
LT3782A
The
l
denotes the specifications which apply over the full operating junction
temperature range, otherwise specifications are at T
J
= 25°C. V
CC
= 13V, R
SET
= 80k, no load on any outputs, unless otherwise noted.
PARAMETER
Gate Driver
V
GBIAS
BGATE1, BGATE2 High Voltage
BGATE1, BGATE2 Source Current (Peak)
BGATE1, BGATE2 Low Voltage
BGATE1, BGATE2 Sink Current (Peak)
SGATE1, SGATE2 High Voltage
SGATE1, SGATE2 Low Voltage
SGATE1, SGATE2 Peak Current
Delay of BGATE High
I
GBIAS
< 70mA
13V ≤ V
CC
≤ 24V, I
BGATE
= –100mA
V
CC
= 8V, I
BGATE
= –100mA
Capacitive Load >22µF
Capacitive Load >50µF
8V ≤ V
CC
≤ 24V, I
BGATE
= 100mA
Capacitive Load >22µF
Capacitive Load >50µF
8V ≤ V
CC
≤ 24V, I
SGATE
= –20mA
8V ≤ V
CC
≤ 24V, I
SGATE
= 20mA
500pF Load
DELAY Pin and R
SET
Pin Shorted
V
DELAY
= 1V
V
DELAY
= 0.5V
V
DELAY
= 0.25V
V
DELAY
= 0.25V
l
l
l
l
l
l
elecTrical characTerisTics
CONDITIONS
MIN
10.2
7.8
3.8
TYP
11
9.2
5
3
4
0.5
3
4
MAX
11.7
10.5
UNITS
V
V
V
A
A
0.7
V
A
A
4.5
5.5
0.5
100
100
150
250
500
–0.1
6.7
0.7
V
V
mA
ns
ns
ns
ns
Delay Pin Input Current
–0.3
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 LT3782AE is guaranteed to meet performance specifications
from 0°C to 85°C operating 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 LT3782AI is guaranteed to meet performance specifications over the
full –40°C to 125°C operating junction temperature range. The maximum
ambient temperature is determined by specific operating conditions in
conjunction with board layout, the rated package thermal resistance and
other environmental factors.
Note 3:
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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