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LT3782AIFE#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
LT3782A
1
3782afc
For more information www.linear.com/LT3782A
3782A TA01
6.8nF
13k
0.1µF
10nF
10µF
×2
80k
59k
0.004Ω
1µF
274k
825k
220µF
V
OUT
50V, 4A
V
IN
10V TO 36V
+
2µF
20µH
20µH
0.004Ω
LT3782A
V
CC
RUN
SLOPE
DELAY
DCL
R
SET
SS
V
C
GBIAS2
GBIAS
BGATE1
V
EE1
BGATE2
V
EE2
SENSE1
+
SENSE1
–
SENSE2
+
SENSE2
–
FB
GND
GBIAS1
10Ω
10nF
10Ω
475k
D1, D2: 30BQ060PbF
Q1, Q2: Si7852DP-T1-E3
D1
D2
Q1
Q2
100pF
24.9k
10µF
×2
Typical applicaTion
FeaTures
applicaTions
DescripTion
2-Phase Step-Up
DC/DC Controller
The LT
®
3782A is a current mode 2-phase step-up DC/DC
converter controller. Its high switching frequency (up to
500kHz) and 2-phase operation reduce system filtering
capacitance and inductance requirements.
With 10V gate drive (V
CC
≥13V) and 4A peak drive current,
the LT3782A can drive most industrial grade high power
MOSFETs with high efficiency. For synchronous applica
-
tions, the LT3782A provides synchronous gate signals
with programmable falling edge delay to avoid cross
conduction when using external MOSFET drivers. Other
features include programmable undervoltage lockout,
soft-start, current limit, duty cycle clamp (50% or higher)
and slope compensation. The LT3782A is identical to the
LT3782 except that the LT3782A has a tighter current
sense mismatch tolerance.
The LT3782A is available in thermally enhanced 28-lead
TSSOP and 4mm × 5mm QFN packages.
n
Industrial Equipment
n
Telecom Infrastructure
n
Interleaved Isolated Power Supply
n
2-Phase Operation Reduces Required Input and
Output Capacitance
n
Programmable Switching Frequency:
150kHz to 500kHz
n
6V to 40V Input Range
n
10V Gate Drive with V
CC
≥13V
n
High Current Gate Drive (4A)
n
Programmable Soft-Start and Current Limit
n
Programmable Slope Compensation for
High Noise Immunity
n
MOSFET Gate Signals with Programmable
Falling Edge Delay for External Synchronous Drivers
n
Programmable Undervoltage Lockout
n
Programmable Duty Cycle Clamp (50% or Higher)
n
Thermally Enhanced 28-Lead TSSOP and 4mm ×
5mm QFN Packages
50V 4A Boost Converter Efficiency and Power Loss
vs Load Current
I
OUT
(A)
0
EFFICIENCY (%)
4
3782A TA01b
POWER LOSS (W)
18
15
12
9
6
3
0
1
2
3
5
V
IN
= 12V
V
IN
= 12V
V
IN
= 24V
V
IN
= 24V
EFFICIENCY
POWER LOSS
97
93
95
91
89
87
85
L, LT , LTC , LT M , Linear Technology and the Linear logo are registered trademarks, ThinSOT
and No R
SENSE
are trademarks of Linear Technology Corporation. All other trademarks are the
property of their respective owners. Protected by U.S. Patents including 6144194.
LT3782A
2
3782afc
For more information www.linear.com/LT3782A
T
JMAX
= 125°C, θ
JA
= 30°C/ W
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
V
CC
Supply Voltage ...................................................40V
GBIAS, GBIAS1, GBIAS2 Pin
(Externally Forced)....................................................14V
SYNC, RUN Pin .........................................................30V
Operating Junction Temperature
Range (Notes 2, 3) ................................. –40°C to 125°C
(Note 1)
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
1
2
3
4
5
6
7
8
9
10
11
12
13
14
TOP VIEW
FE PACKAGE
28-LEAD PLASTIC TSSOP
28
27
26
25
24
23
22
21
20
19
18
17
16
15
SGATE2
SGATE1
NC
GND
SYNC
DELAY
DCL
SENSE1
+
SENSE1
–
SLOPE
R
SET
SENSE2
–
SENSE2
+
SS
GBIAS
V
CC
NC
NC
V
EE1
BGATE1
GBIAS1
GBIAS2
BGATE2
V
EE2
NC
RUN
FB
V
C
29
GND
9 10
TOP VIEW
29
GND
UFD PACKAGE
28-LEAD (4mm × 5mm) PLASTIC QFN
11 12 13
28 27 26 25 24
14
23
6
5
4
3
2
1
SYNC
DELAY
DCL
SENSE1
+
SENSE1
–
SLOPE
R
SET
SENSE2
–
BGATE1
GBIAS1
NC
NC
GBIAS2
BGATE2
V
EE2
NC
GND
SGATE1
SGATE2
GBIAS
V
CC
V
EE1
NC
SENSE2
+
SS
V
C
FB
RUN
7
17
18
19
20
21
22
16
8
15
T
JMAX
= 125°C, θ
JA
= 37°C/ W
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
absoluTe MaxiMuM raTings
pin conFiguraTion
orDer inForMaTion
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3782AEFE#PBF LT3782AEFE#TRPBF LT3782AFE 28-Lead Plastic TSSOP –40°C to 125°C
LT3782AIFE#PBF LT3782AIFE#TRPBF LT3782AFE 28-Lead Plastic TSSOP –40°C to 125°C
LT3782AEUFD#PBF LT3782AEUFD#TRPBF 3782A 28-Lead (4mm × 5mm) Plastic QFN –40°C to 125°C
LT3782AIUFD#PBF LT3782AIUFD#TRPBF 3782A 28-Lead (4mm × 5mm) Plastic QFN –40°C to 125°C
LEAD BASED FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3782AEFE LT3782AEFE#TR LT3782AFE 28-Lead Plastic TSSOP –40°C to 125°C
LT3782AIFE LT3782AIFE#TR LT3782AFE 28-Lead Plastic TSSOP –40°C to 125°C
LT3782AEUFD LT3782AEUFD#TR 3782A 28-Lead (4mm × 5mm) Plastic QFN –40°C to 125°C
LT3782AIUFD LT3782AIUFD#TR 3782A 28-Lead (4mm × 5mm) Plastic QFN –40°C to 125°C
Consult LT C 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/
LT3782A
3
3782afc
For more information www.linear.com/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 CONDITIONS MIN TYP MAX UNITS
Overall
Supply Voltage (V
CC
)
l
6 40 V
Supply Current (I
VCC
) V
C
≤ 0.5V (Switching Off), V
CC
≤ 40V 11 16 mA
Shutdown
RUN Threshold
l
2.3 2.44 2.6 V
RUN Threshold Hysteresis 80 mV
Supply Current in Shutdown 1V ≤ RUN ≤ V
REF
RUN ≤ 0.3V, V
CC
≤ 30V
0.4
40
0.65
90
mA
µA
RUN Pin Input Current V
RUN
= 2.3V
l
–0.5 –2 µA
Voltage Amplifier g
m
Reference Voltage (V
REF
)
l
2.42
2.4
2.44 2.464
2.488
V
V
Transconductance V
VC
= 1V, ∆I
VC
= ±2µA
l
200 260 370 µmho
Input Current I
FB
V
FB
= V
REF
l
0.2 0.6 µA
V
C
High I
VC
= 0 1.5 V
V
C
Low I
VC
= 0 0.35 0.4 V
Source Current I
VC
V
VC
= 0.7V – 1V, V
FB
= V
REF
– 100mV 8 11 14 µA
Sink Current I
VC
V
VC
= 0.7V – 1V, V
FB
= V
REF
+ 100mV 13 20 28 µA
V
C
Threshold for Switching Off (BGATE1, BGATE2 Low)
l
0.3 V
Soft-Start Current I
SS
V
SS
= 0.1V – 2.8V 6 10 15 µA
Current Amplifier CA1, CA2
Voltage Gain ∆V
C
/∆V
SENSE
4
Current Limit (V
SENSE1
+
– V
SENSE1
–
) (V
SENSE2
+
– V
SENSE2
–
) V
FB
= 2.3V 55 63 70 mV
Current Limit Mismatch (∆V
SENSE1
– ∆V
SENSE2
), V
FB
= 2.3V –10 10 mV
Input Current (I
SENSE1
+
, I
SENSE1
–
, I
SENSE2
+
, I
SENSE2
–
) ∆V
SENSE
= 0V 60 µA
Oscillator
Switching Frequency
R
SET
= 130k
R
SET
= 80k
R
SET
= 40k
l
l
l
130
212
386
154
250
465
177
288
533
kHz
kHz
kHz
Synchronization Pulse Threshold on SYNC Pin Rising Edge V
SYNC
0.8 1.2 2 V
Synchronization Frequency Range
(Note: Operation Switching Frequency Equals
Half of the Synchronization Frequency)
R
SET
= 130k
R
SET
= 80k
R
SET
= 40k
180
290
550
240
392
715
kHz
kHz
kHz
V
RSET
R
SET
= 80k 2.3 V
Maximum Duty Cycle V
FB
= V
REF
– 25mV, R
SET
> 80k
R
SET
= 40k
l
l
90
83
94
90
%
%
Duty Cycle Limit
R
SET
= 80k, V
DCL
≤ 0.3V
V
DCL
= 1.2V
V
DCL
= V
RSET
50
75
Max Duty Cycle
%
%
DCL Pin Input Current V
DCL
≤ 0.3V
l
–0.1 –0.3 µA
elecTrical characTerisTics
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LT3782AIFE#TRPBF

Mfr. #:
Buy LT3782AIFE#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 2-PhBoost DC/DC Cntr
Lifecycle:
New from this manufacturer.
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