鈻?/div>
2-Phase Operation Reduces Required Input and
Output Capacitance
Programmable Switching Frequency:
150kHz to 500kHz
6V to 40V Input Range
10V Gate Drive with V
CC
鈮?3V
High Current Gate Drive (4A)
Programmable Soft-Start and Current Limit
Programmable Slope Compensation for
High Noise Immunity
MOSFET Gate Signals with Programmable
Falling Edge Delay for External Synchronous
Drivers
Programmable Undervoltage Lockout
Programmable Duty Cycle Clamp (50% or Higher)
Thermally Enhanced 28-Lead SSOP Package
The LT
廬
3782 is a current mode two 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
鈮?3V)
and 4A peak drive current,
the LT3782 can drive most industrial grade high power
MOSFETs with high efficiency. For synchronous applica-
tions, the LT3782 provides synchronous gate signals with
programmable falling edge delay to avoid cross conduc-
tion 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 LT3782 is available in a thermally enhanced 28-lead
SSOP package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 6144194.
APPLICATIO S
鈻?/div>
鈻?/div>
鈻?/div>
Industrial Equipment
Telecom Infrastructure
Interleaved Isolated Power Supply
TYPICAL APPLICATIO
V
IN
10V TO 36V
V
CC
R6
825k
C
IN
10碌F
50V
2x
R8
274k
1碌F
RUN
50V 4A Boost Converter
L1
GBIAS1
GBIAS2
GBIAS
BGATE1
R
S1
0.004鈩?/div>
V
EE1
SLOPE
DELAY
R
FREQ
80k
DCL
R
SET
SS
0.1碌F
V
C
13k
100pF
6.8nF
V
EE2
10鈩?/div>
SENSE1
+
SENSE1
鈥?/div>
SENSE2
+
SENSE2
鈥?/div>
FB
GND
10nF
10nF
R
F1
475k
10鈩?/div>
BGATE2
M2
Si7852dp
2x
R
S2
0.004鈩?/div>
D1
30BQ060
D2
30BQ060
C
OUT1
10碌F
50V
2x
V
OUT
50V, 4A
+
C3 L2
2碌F
M1
Si7852dp
2x
+
C
OUT2
220碌F
R
SLOPE
59k
EFFICIENCY (%)
LT3782
L1, L2: PB2020.223
C
IN
, C
OUT1
: X7R, TDK
3782 TA01
R
F2
24.9k
U
Efficiency and Power Loss
vs Load Current
97
EFFICIENCY
95
V
IN
= 12V
POWER LOSS (W)
93
91
89
87
85
V
IN
= 12V
V
IN
= 24V
POWER LOSS
3
0
12
9
6
V
IN
= 24V
15
18
0
1
2
3
I
OUT
(A)
4
5
3782 TA01b
U
U
3782fa
1
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