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LTC3703EG-5#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P32
LTC3703-5
1
37035fa
APPLICATIO S
U
DESCRIPTIO
U
FEATURES
TYPICAL APPLICATIO
U
■
High Voltage Operation: Up to 60V
■
Large 1
Ω
Gate Drivers (with 5V Supply)
■
No Current Sense Resistor Required
■
Step-Up or Step-Down DC/DC Converter
■
Dual N-Channel MOSFET Synchronous Drive
■
Excellent Line and Load Transient Response
■
Programmable Constant Frequency: 100kHz to
600kHz
■
±1% Reference Accuracy
■
Synchronizable up to 600kHz
■
Selectable Pulse Skip Mode Operation
■
Low Shutdown Current: 25µA Typ
■
Programmable Current Limit
■
Undervoltage Lockout
■
Programmable Soft-Start
■
16-Pin Narrow SSOP and 28-Pin SSOP Packages
The LTC
®
3703-5 is a synchronous step-down switching
regulator controller that can directly step-down voltages
from up to 60V input, making it ideal for telecom and au-
tomotive applications. The LTC3703-5 drives external logic
level 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
LTC3703-5 to drive multiple MOSFETs for higher current
applications. The operating frequency is user program-
mable from 100kHz to 600kHz and can also be synchro-
nized to an external clock for noise-sensitive applications.
Current 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 applications requiring up to 100V operation, refer to
the LTC3703 data sheet.
60V Synchronous
Switching Regulator Controller
Efficiency vs Load Current
High Efficiency High Voltage Step-Down Converter
LTC3703-5
MODE/SYNC
FSET
COMP
FB
I
MAX
INV
RUN/SS
GND
V
IN
BOOST
TG
SW
V
CC
DRV
CC
BG
BGRTN
22µF
×2
1000pF
2200pF
10k
100Ω
113k
1%
21.5k
1%
10Ω
12k
30k
0.1µF
V
IN
6V TO 60V
8µH
D1
MBR1100
V
OUT
5V
5A
270µF
16V
MMDL770T1
V
CC
5V
0.1µF
37035 TA04
10µF
1µF
+
+
+
Si7850DP
Si7850DP
22µF
470pF
LOAD CURRENT (A)
0
EFFICIENCY (%)
100
95
90
85
80
4
37053 TA04b
1
2
3
5
V
IN
= 12V
V
IN
= 42V
V
IN
= 24V
■
48V Telecom and Base Station Power Supplies
■
Networking Equipment, Servers
■
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
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
*U.S. Patent Numbers: 5408150, 5055767, 6677210, 5847554, 5481178, 6304066, 6580258;
Others Pending.
LTC3703-5
2
37035fa
Supply Voltages
V
CC
, DRV
CC
.......................................... –0.3V to 15V
(DRV
CC
– BGRTN), (BOOST – SW) ...... –0.3V to 15V
BOOST (Continuous) ............................ –0.3V to 85V
BOOST (400ms) ................................... –0.3V to 95V
BGRTN ...................................................... –5V to 0V
V
IN
Voltage (Continuous).......................... –0.3V to 70V
V
IN
Voltage (400ms) ................................. –0.3V to 80V
SW Voltage (Continuous) ............................ –1V to 70V
SW Voltage (400ms) ................................... –1V to 80V
Run/SS Voltage .......................................... –0.3V to 5V
ABSOLUTE AXI U RATI GS
W
WW
U
(Note 1)
ELECTRICAL CHARACTERISTICS
The ● 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
= 5V, 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 ● 4.1 15 V
V
IN
V
IN
Pin Voltage ● 60 V
I
CC
V
CC
Supply Current V
FB
= 0V ● 1.7 2.5 mA
RUN/SS = 0V 25 40 µA
I
DRVCC
DRV
CC
Supply Current (Note 5) 0 5 µA
RUN/SS = 0V 0 5 µA
I
BOOST
BOOST Supply Current (Note 5) ● 360 500 µA
RUN/SS = 0V 0 5 µA
MODE/SYNC, INV Voltages....................... –0.3V to 15V
f
SET
, FB, I
MAX
, COMP Voltages ................... –0.3V to 3V
Driver Outputs
TG ................................ SW – 0.3V to BOOST + 0.3V
BG ........................... BGRTN – 0.3V to DRV
CC
+ 0.3V
Peak Output Current <10µs BG,TG ............................ 5A
Operating Temperature Range (Note 2)
LTC3703E-5 ........................................ –40°C to 85°C
LTC3703I-5 ....................................... –40°C to 125°C
Junction Temperature (Notes 3, 7) ....................... 125°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec.)................. 300°C
ORDER PART
NUMBER
GN PART
MARKING
T
JMAX
= 125°C, θ
JA
= 110°C/W
37035
3703I5
LTC3703EGN-5
LTC3703IGN-5
PACKAGE/ORDER I FOR ATIO
UUW
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ORDER PART
NUMBER
LTC3703EG-5
LTC3703IG-5
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
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
= 125°C, θ
JA
= 100°C/W
LTC3703-5
3
37035fa
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC3703-5 is guaranteed to meet performance specifications
from 0°C to 70°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LTC3703I-5 is guaranteed over the full
–40°C to 125°C operating junction temperature range.
Note 3: T
J
is calculated from the ambient temperature T
A
and power
dissipation P
D
according to the following formula:
LTC3703-5: T
J
= T
A
+ (P
D
• 100 °C/W) G Package
Note 4: The LTC3703-5 is tested in a feedback loop that servos V
FB
to the
ELECTRICAL CHARACTERISTICS
The ● 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
= 5V, V
MODE/SYNC
= V
INV
= V
SW
=
BGRTN = 0V, RUN/SS = I
MAX
= open, R
SET
= 25k, unless otherwise specified.
reference voltage with the COMP pin forced to a voltage between 1V and 2V.
Note 5: The dynamic input supply current is higher due to the power
MOSFET gate charging being delivered at the switching frequency
(Q
G
• f
OSC
).
Note 6: Guaranteed by design. Not subject to test.
Note 7: 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
temperature may impair device reliability.
Note 8: R
DS(ON)
guaranteed by correlation to wafer level measurement.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Main Control Loop
V
FB
Feedback Voltage (Note 4) 0.792 0.800 0.808 V
● 0.788 0.812 V
∆V
FB, LINE
Feedback Voltage Line Regulation 5V < V
CC
< 15V (Note 4) ● 0.007 0.05 %/V
∆V
FB, LOAD
Feedback Voltage Load Regulation 1V < V
COMP
< 2V (Note 4) ● 0.01 0.1 %
V
MODE/SYNC
MODE/SYNC Threshold MODE/SYNC Rising 0.75 0.8 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
= 60V 80 130 µA
RUN/SS = 0V, V
IN
= 10V 0 1 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 – 25 10 55 mV
V
RUN/SS
Shutdown Threshold 0.7 0.9 1.2 V
I
RUN/SS
RUN/SS Source Current RUN/SS = 0V 2.3 3.8 5.3 µA
Maximum RUN/SS Sink Current |V
SW
| – V
IMAX
> 100mV 9 17 25 µA
V
UV
Undervoltage Lockout V
CC
Rising ● 3.4 3.7 4.1 V
V
CC
Falling ● 2.8 3.1 3.4 V
Hysteresis
● 0.45 0.65 0.85 V
Oscillator
f
OSC
Oscillator Frequency R
SET
= 25kΩ 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 0.75 1 A
R
BG, SINK
BG Driver Pull-Down R
DS, ON
(Note 8) 1.2 1.8 Ω
I
TG, PEAK
TG Driver Peak Source Current 0.75 1 A
R
TG, SINK
TG Driver Pull-Down R
DS, ON
(Note 8) 1.2 1.8 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-5#TRPBF

Mfr. #:
Buy LTC3703EG-5#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Lower Voltage Gate-Drive & Supply Version of LTC3703
Lifecycle:
New from this manufacturer.
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