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LTC3703EG#TRPBF

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LTC3703
1
3703fc
Typical applicaTion
FeaTures
applicaTions
DescripTion
100V Synchronous
Switching Regulator
Controller
The LT C
®
3703 is a synchronous step-down switching
regulator controller that can directly step down voltages
from up to 100V, making it ideal for telecom and automo-
tive applications. The LTC3703 drives external N-channel
MOSFETs using a constant frequency (up to 600kHz),
voltage mode architecture.
A precise internal reference provides 1% DC accuracy.
A high bandwidth error amplifier and patented line feed-
forward compensation provide very fast line and load
transient response. Strong 1Ω gate drivers allow the
LTC3703 to drive multiple MOSFETs for higher current ap-
plications. The operating frequency is user programmable
from 100kHz to 600kHz and can also be synchronized to
an external clock for noise-sensitive applications. Cur-
rent limit is programmable with an external resistor and
utilizes the voltage drop across the synchronous MOSFET
to eliminate the need for a current sense resistor. For ap-
plications requiring up to 60V operation with logic-level
MOSFETS, refer to the LTC3703-5 data sheet.
n
High Voltage Operation: Up to 100V
n
Large 1Ω Gate Drivers
n
No Current Sense Resistor Required
n
Step-Up or Step-Down DC/DC Converter
n
Dual N-Channel MOSFET Synchronous Drive
n
Excellent Line and Load Transient Response
n
Programmable Constant Frequency: 100kHz to
600kHz
n
±1% Reference Accuracy
n
Synchronizable up to 600kHz
n
Selectable Pulse-Skip Mode Operation
n
Low Shutdown Current: 50µA Typ
n
Programmable Current Limit
n
Undervoltage Lockout
n
Programmable Soft-Start
n
16-Pin Narrow SSOP and 28-Pin SSOP Packages
n
48V Telecom and Base Station Power Supplies
n
Networking Equipment, Servers
n
Automotive and Industrial Control
PARAMETER LTC3703-5 LTC3703
Maximum V
IN
60V 100V
MOSFET Gate Drive 4.5V to 15V 9.3V to 15V
V
CC
UV
+
3.7V 8.7V
V
CC
UV
–
3.1V 6.2V
LTC3703
MODE/SYNC
f
SET
COMP
FB
I
MAX
INV
RUN/SS
GND
V
IN
BOOST
TG
SW
V
CC
DRV
CC
BG
BGRTN
68µF
1000pF
2200pF
10k
100Ω
113k
1%
8.06k
1%
10Ω
15k
30k
0.1µF
V
IN
15V TO 100V
Si7456DP
8µH
MBR1100
V
OUT
12V
5A
270µF
16V
BAS19
V
CC
9.3V TO 15V
0.1µF
3703 F01
10µF
1µF
+
+
+
Si7456DP
22µF
25V
470pF
LOAD (A)
0
EFFICIENCY (%)
100
95
90
85
80
4
3703 F01b
1
2
3
5
V
IN
= 25V
V
IN
= 50V
V
IN
= 75V
Figure 1. High Efficiency High Voltage Step-Down Converter
Efficiency vs Load Current
L, LT , LT C , LT M , Linear Technology and the Linear logo are registered trademarks and
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 5408150,
5055767, 6677210, 5847554, 5481178, 6304066, 6580258.
LTC3703
2
3703fc
absoluTe MaxiMuM raTings
Supply Voltages
V
CC
, DRV
CC
.......................................... –0.3V to 15V
(DRV
CC
– BGRTN), (BOOST – SW) ....... –0.3V to 15V
BOOST ................................................. –0.3V to 115V
BGRTN ....................................................... –5V to 0V
V
IN
Voltage .............................................. –0.3V to 100V
SW Voltage (Note 10).................................. –1V to 100V
RUN/SS Voltage .......................................... –0.3V to 5V
MODE/SYNC, INV Voltages ....................... –0.3V to 15V
f
SET
, FB, I
MAX
Voltages................................ –0.3V to 3V
(Note 1)
TOP VIEW
GN PACKAGE
16-LEAD NARROW PLASTIC SSOP
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
MODE/SYNC
f
SET
COMP
FB
I
MAX
INV
RUN/SS
GND
V
IN
B00ST
TG
SW
V
CC
DRV
CC
BG
BGRTN
T
JMAX
= 150°C, θ
JA
= 110°C/W
1
2
3
4
5
6
7
8
9
10
11
12
13
14
TOP VIEW
G PACKAGE
28-LEAD PLASTIC SSOP
28
27
26
25
24
23
22
21
20
19
18
17
16
15
BOOST
TG
SW
NC
NC
NC
NC
V
CC
DRV
CC
BG
NC
NC
NC
BGRTN
V
IN
NC
NC
NC
NC
MODE/SYNC
f
SET
COMP
FB
I
MAX
INV
NC
RUN/SS
GND
T
JMAX
= 125°C, θ
JA
= 100°C/W
pin conFiguraTion
orDer inForMaTion
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3703EGN#PBF LTC3703EGN#TRPBF 3703 16-Lead Narrow Plastic SSOP –40°C to 85°C
LTC3703IGN#PBF LTC3703IGN#TRPBF 3703I 16-Lead Narrow Plastic SSOP –40°C to 125°C
LTC3703HGN#PBF LTC3703HGN#TRPBF 3703H 16-Lead Narrow Plastic SSOP –40°C to 150°C
LTC3703EG#PBF LTC3703EG#TRPBF LTC3703EG 28-Lead Plastic SSOP –40°C to 85°C
LEAD BASED FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3703EGN LTC3703EGN#TR 3703 16-Lead Narrow Plastic SSOP –40°C to 85°C
LTC3703IGN LTC3703IGN#TR 3703I 16-Lead Narrow Plastic SSOP –40°C to 125°C
LTC3703HGN LTC3703HGN#TR 3703H 16-Lead Narrow Plastic SSOP –40°C to 150°C
LTC3703EG LTC3703EG#TR LTC3703EG 28-Lead Plastic SSOP –40°C to 85°C
Consult LT C Marketing for parts specified with wider operating temperature ranges.
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/
Peak Output Current <10µs BG,TG ..............................5A
Operating Temperature Range (Note 2)
LTC3703E ............................................–40°C to 85°C
LTC3703I ........................................... –40°C to 125°C
LTC3703H (Note 9) ............................ –40°C to 150°C
Junction Temperature (Notes 3, 7)
LTC3703E, LTC3703I ........................................ 125°C
LTC3703H (Note
9)
........................................... 150°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec.) ..................300°C
LTC3703
3
3703fc
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= DRV
CC
= V
BOOST
= V
IN
= 10V, V
MODE/SYNC
= V
INV
= V
SW
=
BGRTN = 0V, RUN/SS = I
MAX
= open, R
SET
= 25k, unless otherwise specified.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CC
, DRV
CC
V
CC
, DRV
CC
Supply Voltage
l
9.3 15 V
V
IN
V
IN
Pin Voltage
l
100 V
I
CC
V
CC
Supply Current V
FB
= 0V
RUN/SS = 0V
l
1.7
50
2.5 mA
µA
I
DRVCC
DRV
CC
Supply Current (Note 5)
RUN/SS = 0V
0
0
5
5
µA
µA
I
BOOST
BOOST Supply Current (Note 5) T
J
≤ 125°C
T
J
> 125°C
RUN/SS = 0V
l
l
360
360
0
500
800
5
µA
µA
µA
Main Control Loop
V
FB
Feedback Voltage (Note 4)
l
0.792
0.788
0.800 0.808
0.812
V
V
∆V
FB(LINE)
Feedback Voltage Line Regulation 9V < V
CC
< 15V (Note 4)
l
0.007 0.05 %/V
∆V
FB(LOAD)
Feedback Voltage Load Regulation 1V < V
COMP
< 2V (Note 4)
l
0.01 0.1 %
V
MODE/SYNC
MODE/SYNC Threshold MODE/SYNC Rising 0.75 0.81 0.87 V
∆V
MODE/SYNC
MODE/SYNC Hysteresis 20 mV
I
MODE/SYNC
MODE/SYNC Current 0 ≤ V
MODE/SYNC
≤ 15V 0 1 µA
V
INV
Invert Threshold 1 1.5 2 V
I
INV
Invert Current 0 ≤ V
INV
≤ 15V 0 1 µA
I
VIN
V
IN
Sense Input Current V
IN
= 100V
RUN/SS = 0V, V
IN
= 10V
100
0
140
1
µA
µA
I
MAX
I
MAX
Source Current V
IMAX
= 0V 10.5 12 13.5 µA
V
OS(IMAX)
V
IMAX
Offset Voltage |V
SW
| – V
IMAX
at I
RUN/SS
= 0µA
H Grade
–25
–25
10
10
55
65
mV
mV
V
RUN/SS
Shutdown Threshold 0.7 0.9 1.2 V
I
RUN/SS
RUN/SS Source Current RUN/SS = 0V 2.5 4 5.5 µA
Maximum RUN/SS Sink Current |V
SW
| – V
IMAX
≥ 200mV, V
RUN/SS
= 3V 9 17 25 µA
V
UV
Undervoltage Lockout V
CC
Rising
V
CC
Falling
l
l
8.0
5.7
8.7
6.2
9.3
6.8
V
V
Oscillator
f
OSC
Oscillator Frequency R
SET
= 25k 270 300 330 kHz
f
SYNC
External Sync Frequency Range 100 600 kHz
t
ON(MIN)
Minimum On-Time 200 ns
DC
MAX
Maximum Duty Cycle f < 200kHz 89 93 96 %
Driver
I
BG(PEAK)
BG Driver Peak Source Current 1.5 2 A
R
BG(SINK)
BG Driver Pull-Down R
DS(ON)
(Note 8) 1 1.5 Ω
I
TG(PEAK)
TG Driver Peak Source Current 1.5 2 A
R
TG(SINK)
TG Driver Pull-Down R
DS(ON)
(Note 8) 1 1.5 Ω
Feedback Amplifier
A
VOL
Op Amp DC Open Loop Gain (Note 4) 74 85 dB
f
U
Op Amp Unity Gain Crossover Frequency (Note 6) 25 MHz
I
FB
FB Input Current 0 ≤ V
FB
≤ 3V 0 1 µA
I
COMP
COMP Sink/Source Current ±5 ±10 mA
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LTC3703EG#TRPBF

Mfr. #:
Buy LTC3703EG#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 100V Step-Down DC/DC Controller
Lifecycle:
New from this manufacturer.
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