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Linear Technology Electronic Components Datasheet

LTC3611 Datasheet

32V Monolithic Synchronous Step-Down DC/DC Converter

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FEATURES
n 10A Output Current
n Wide VIN Range = 4.5V to 32V (36V Maximum)
n Internal N-Channel MOSFETs
n True Current Mode Control
n Optimized for High Step-Down Ratios
n t0N(MIN) ≤ 100ns
n Extremely Fast Transient Response
n Stable with Ceramic COUT
n ±1% 0.6V Voltage Reference
n Power Good Output Voltage Monitor
n Adjustable On-Time/Switching Frequency (>1MHz)
n Adjustable Current Limit
n Programmable Soft-Start
n Output Overvoltage Protection
n Optional Short-Circuit Shutdown Timer
n Low Shutdown IQ: 15μA
n Available in a 9mm × 9mm 64-Pin QFN Package
APPLICATIONS
n Point of Load Regulation
n Distributed Power Systems
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Protected by U.S. Patents including
5481178, 6100678, 6580258, 5847554, 6304066.
LTC3611
10A, 32V Monolithic
Synchronous Step-Down
DC/DC Converter
DESCRIPTION
The LTC®3611 is a high efficiency, monolithic synchronous
step-down DC/DC converter that can deliver up to 10A
output current from a 4.5V to 32V (36V maximum) input
supply. It uses a constant on-time valley current mode
control architecture to deliver very low duty cycle opera-
tion at high frequency with excellent transient response.
The operating frequency is selected by an external resistor
and is compensated for variations in VIN and VOUT.
The LTC3611 can be configured for discontinuous or
forced continuous operation at light load. Forced continu-
ous operation reduces noise and RF interference while
discontinuous mode provides high efficiency by reducing
switching losses at light loads.
Fault protection is provided by internal foldback current
limiting, an output overvoltage comparator and an optional
short-circuit shutdown timer. Soft-start capability for sup-
ply sequencing is accomplished using an external timing
capacitor. Theregulatorcurrentlimitisuserprogrammable.
A power good output voltage monitor indicates when
the output is in regulation. The LTC3611 is available in a
compact 9mm × 9mm QFN package.
TYPICAL APPLICATION
High Efficiency Step-Down Converter
0.1μF VOUT
100pF
680pF
12.5k
INTVCC
39.2k
11k
VON
RUN/SS
ION
VIN
LTC3611
SW
ITH BOOST
SGND INTVCC
FCB
VRNG
PGOOD PGND
EXTVCC VFB
3611 TA01a
182k
1μH
0.22μF
10μF
×3
VIN
4.5V TO 32V
100μF
×2
VOUT
2.5V
10A
4.7μF
30.1k
9.5k
Efficiency and Power Loss vs
Load Current
100
VOUT = 2.5V
90
80 VIN = 5V
70
VIN = 25V
10000
1000
60
50 100
POWER LOSS,
40 VIN = 5V
30
20 POWER LOSS,
10 VIN = 25V
10
0
0.01
0.1 1
LOAD CURRENT (A)
1
10
3611 TA01b
3611fb
1


Linear Technology Electronic Components Datasheet

LTC3611 Datasheet

32V Monolithic Synchronous Step-Down DC/DC Converter

No Preview Available !

LTC3611www.DataSheet4U.com
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Supply Voltage (VIN, ION) .................. 36V to –0.3V
Boosted Topside Driver Supply Voltage
(BOOST) ................................................ 42V to –0.3V
SW Voltage ............................................... 36V to –5V
INTVCC, EXTVCC, (BOOST – SW), RUN/SS,
PGOOD Voltages...................................... 7V to –0.3V
FCB, VON, VRNG Voltages............ INTVCC + 0.3V to –0.3V
ITH, VFB Voltages ....................................... 2.7V to –0.3V
Operating Temperature Range
(Note 4) ............................................. –40°C to 125°C
Junction Temperature (Note 2) ............................. 125°C
Storage Temperature Range...................–55°C to 125°C
PIN CONFIGURATION
TOP VIEW
PGND 1
PGND 2
PGND 3
SW 4
SW 5
SW 6
SW 7
SW 8
SW 9
SW 10
SW 11
PVIN 12
PVIN 13
PVIN 14
PVIN 15
PVIN 16
65
PGND
66
SW
67
PVIN
68
SGND
48 SGND
47 SGND
46 SGND
45 SGND
44 EXTVCC
43 VFB
42 SGND
41 ION
40 SGND
39 FCB
38 ITH
37 VRNG
36 PGOOD
35 VON
34 SGND
33 SGND
WP PACKAGE
64-LEAD (9mm × 9mm) QFN MULTIPAD
TJMAX = 125°C, θJA = 28°C/W
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3611EWP#PBF
LTC3611EWP#TRPBF LTC3611WP
64-Lead (9mm × 9mm) Plastic QFN
–40°C to 125°C
LTC3611IWP#PBF
LTC3611IWP#TRPBF LTC3611WP
64-Lead (9mm × 9mm) Plastic QFN
–40°C to 125°C
LEAD BASED FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3611EWP
LTC3611EWP#TR
LTC3611WP
64-Lead (9mm × 9mm) Plastic QFN
–40°C to 125°C
LTC3611IWP
LTC3611IWP#TR
LTC3611WP
64-Lead (9mm × 9mm) Plastic QFN
–40°C to 125°C
Consult LTC 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/
3611fb
2


Part Number LTC3611
Description 32V Monolithic Synchronous Step-Down DC/DC Converter
Maker Linear Technology
Total Page 24 Pages
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