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Linear Technology Electronic Components Datasheet

LTC3703EG-5 Datasheet

60V Synchronous Switching Regulator Controller

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LTC3703-5
60V Synchronous
Switching Regulator Controller
FEATURES
High Voltage Operation: Up to 60V
Large 1Gate 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
U
APPLICATIO S
48V Telecom and Base Station Power Supplies
Networking Equipment, Servers
Automotive and Industrial Control
, 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.
DESCRIPTIO
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 1gate 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.
PARAMETER
Maximum VIN
MOSFET Gate Drive
VCC UV+
VCC UV
LTC3703-5
60V
4.5V to 15V
3.7V
3.1V
LTC3703
100V
9.3V to 15V
8.7V
6.2V
TYPICAL APPLICATIO
High Efficiency High Voltage Step-Down Converter
VCC
5V
1000pF
30k
10k
470pF
21.5k
12k
1%
100
113k
1%
2200pF
0.1µF
MODE/SYNC VIN
FSET BOOST
COMP
TG
LTC3703-5
FB
SW
IMAX
VCC
INV
DRVCC
RUN/SS
BG
GND BGRTN
+
22µF
MMDL770T1
VIN
6V TO 60V
+
Si7850DP
22µF
×2
0.1µF
8µH
10
10µF
1µF
Si7850DP
270µF +
16V
D1
MBR1100
VOUT
5V
5A
37035 TA04
Efficiency vs Load Current
100
VIN = 12V
95
VIN = 24V
VIN = 42V
90
85
80
0
1
2
3
4
5
LOAD CURRENT (A)
37053 TA04b
37035fa
1


Linear Technology Electronic Components Datasheet

LTC3703EG-5 Datasheet

60V Synchronous Switching Regulator Controller

No Preview Available !

LTC3703-5
ABSOLUTE AXI U RATI GS (Note 1)
Supply Voltages
VCC, DRVCC .......................................... –0.3V to 15V
(DRVCC – BGRTN), (BOOST – SW) ...... –0.3V to 15V
BOOST (Continuous) ............................ –0.3V to 85V
BOOST (400ms) ................................... –0.3V to 95V
BGRTN ...................................................... –5V to 0V
VIN Voltage (Continuous) .......................... –0.3V to 70V
VIN 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
MODE/SYNC, INV Voltages ....................... –0.3V to 15V
fSET, FB, IMAX, COMP Voltages ................... –0.3V to 3V
Driver Outputs
TG ................................ SW – 0.3V to BOOST + 0.3V
BG ........................... BGRTN – 0.3V to DRVCC + 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
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
MODE/SYNC 1
fSET 2
COMP 3
FB 4
IMAX 5
INV 6
RUN/SS 7
GND 8
16 VIN
15 B00ST
14 TG
13 SW
12 VCC
11 DRVCC
10 BG
9 BGRTN
GN PACKAGE
16-LEAD NARROW PLASTIC SSOP
TJMAX = 125°C, θJA = 110°C/W
ORDER PART
NUMBER
LTC3703EGN-5
LTC3703IGN-5
GN PART
MARKING
37035
3703I5
Consult LTC Marketing for parts specified with wider operating temperature ranges.
VIN 1
NC 2
NC 3
NC 4
NC 5
MODE/SYNC 6
fSET 7
COMP 8
FB 9
IMAX 10
INV 11
NC 12
RUN/SS 13
GND 14
TOP VIEW
28 BOOST
27 TG
26 SW
25 NC
24 NC
23 NC
22 NC
21 VCC
20 DRVCC
19 BG
18 NC
17 NC
16 NC
15 BGRTN
G PACKAGE
28-LEAD PLASTIC SSOP
TJMAX = 125°C, θJA = 100°C/W
ORDER PART
NUMBER
LTC3703EG-5
LTC3703IG-5
ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = DRVCC = VBOOST = VIN = 5V, VMODE/SYNC = VINV = VSW =
BGRTN = 0V, RUN/SS = IMAX = open, RSET = 25k, unless otherwise specified.
SYMBOL
VCC, DRVCC
VIN
ICC
IDRVCC
IBOOST
PARAMETER
VCC, DRVCC Supply Voltage
VIN Pin Voltage
VCC Supply Current
DRVCC Supply Current
BOOST Supply Current
CONDITIONS
VFB = 0V
RUN/SS = 0V
(Note 5)
RUN/SS = 0V
(Note 5)
RUN/SS = 0V
MIN TYP MAX UNITS
4.1
15
V
60
V
1.7
2.5
mA
25
40
µA
0
5
µA
0
5
µA
360 500
µA
0
5
µA
37035fa
2


Part Number LTC3703EG-5
Description 60V Synchronous Switching Regulator Controller
Maker Linear
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